Configure jQuery to retry ajax calls if they fail

Configure jQuery to retry ajax calls if they fail - javascript

I have all my ajax calls in a custom JS file. And trust me there are alot of them!
I would like to implement a "retry on fail behavior" in all ajax calls.
Is there a way to do it like "interception"? Or do I have to do it one by one?
My fear here is that a future dev will forget to set the retry policy...
Sample ajax call:
$.ajax({
url: apiRoot + 'reservationItens?reservaId=' + idReservation + '&bagId=' + idBag,
type: 'PUT',
success: function () {
if (onSuccess != null) {
onSuccess();
}
},
error: function (x, y, z) {
if (onError != null) {
onError(x, y, z);
}
}
});

You can use ajaxError which takes a callback that is called on every ajax error.
Additionally you can add a boolean to the settings object and check for it in the callback which ensures that one failed request is only called a second time and not more.
$(document).ajaxError(function (event, jqxhr, settings) {
if(!settings.secondExec) {
settings.secondExec = true;
$.ajax(settings);
}
});
If desired add a timeout for the second request to increase the possibility that a random server or connection problem is resolved in the meantime:
setTimeout(function() {
$.ajax(settings);
}, 500);
If you want to exclude some requests just add another property to the request settings which you then use like secondExec is used in the example.

Here's a working jsfiddle.
I'd do it like this, with a recursive function:
function AjaxRetry(settings, maxTries, interval) {
var self = this;
this.settings = settings;
this.maxTries = typeof maxTries === "number" ? maxTries : 0;
this.completedTries = 0;
this.interval = typeof interval === "number" ? interval : 0;
// Return a promise, so that you can chain methods
// as you would with regular jQuery ajax calls
return tryAjax().promise();
function tryAjax(deferred) {
console.log("Trying ajax #" + (self.completedTries + 1));
var d = deferred || $.Deferred();
$.ajax(self.settings)
.done(function(data) {
// If it succeeds, don't keep retrying
d.resolve(data);
})
.fail(function(error) {
self.completedTries++;
// Recursively call this function again (after a timeout)
// until either it succeeds or we hit the max number of tries
if (self.completedTries < self.maxTries) {
console.log("Waiting " + interval + "ms before retrying...");
setTimeout(function(){
tryAjax(d);
}, self.interval);
} else {
d.reject(error);
}
});
return d;
}
}
And then usage is like this:
var settings = {
url: "https://httpbin.org/get",
data: {foo: "bar"},
contentType: "application/json; charset=UTF-8"
};
var maxTries = 3;
var interval = 500;
// Make your ajax call and retry up to 3 times,
// waiting 500 milliseconds between attempts.
new AjaxRetry(settings, maxTries, interval)
.done(function(data){
alert("My ajax call succeeded!");
})
.fail(function(error) {
alert("My ajax call failed :'(");
})
.always(function(resp){
alert("My ajax call is over.");
});

You can create api method for ajax calls, just like this one. In the ajaxApi function you can create your own handlers. For example for success or error events, thanks to this developer using this api can attach his handlers, without worrying what else handlers to attach.
function outerSuccesFN() {
console.log('outerSuccesFN');
}
function outerErroFN() {
console.log('outerErroFN');
}
function completeFn() {
console.log(completeFn);
}
function ajaxApi(url, dataType, data, timeout) {
var ajaxResults = $.ajax({
url: url,
dataType: dataType,
data: data,
timeout: timeout
});
function mySuccesFn() {
console.log('mySuccesFn');
}
function myErroFn() {
console.log('myErroFn');
}
return ajaxResults.done(mySuccesFn).fail(myErroFn);
}
var ajaxResult = ajaxApi('http://api.jquery.com/jsonp/', 'jsonp', {
title: 'ajax'
}, 15000);
ajaxResult.done(outerSuccesFN).fail(outerErroFN).always(completeFn);

Related

How can I make many AJAX requests, then call a function when they have all completed? [duplicate]

How do I make a function wait until all jQuery Ajax requests are done inside another function?
In short, I need to wait for all Ajax requests to be done before I execute the next. But how?

jQuery now defines a when function for this purpose.
It accepts any number of Deferred objects as arguments, and executes a function when all of them resolve.
That means, if you want to initiate (for example) four ajax requests, then perform an action when they are done, you could do something like this:
$.when(ajax1(), ajax2(), ajax3(), ajax4()).done(function(a1, a2, a3, a4){
// the code here will be executed when all four ajax requests resolve.
// a1, a2, a3 and a4 are lists of length 3 containing the response text,
// status, and jqXHR object for each of the four ajax calls respectively.
});
function ajax1() {
// NOTE: This function must return the value
// from calling the $.ajax() method.
return $.ajax({
url: "someUrl",
dataType: "json",
data: yourJsonData,
...
});
}
In my opinion, it makes for a clean and clear syntax, and avoids involving any global variables such as ajaxStart and ajaxStop, which could have unwanted side effects as your page develops.
If you don't know in advance how many ajax arguments you need to wait for (i.e. you want to use a variable number of arguments), it can still be done but is just a little bit trickier. See Pass in an array of Deferreds to $.when() (and maybe jQuery .when troubleshooting with variable number of arguments).
If you need deeper control over the failure modes of the ajax scripts etc., you can save the object returned by .when() - it's a jQuery Promise object encompassing all of the original ajax queries. You can call .then() or .fail() on it to add detailed success/failure handlers.

If you want to know when all ajax requests are finished in your document, no matter how many of them exists, just use $.ajaxStop event this way:
$(document).ajaxStop(function () {
// 0 === $.active
});
In this case, neither you need to guess how many requests are happening in the application, that might finish in the future, nor dig into functions complex logic or find which functions are doing HTTP(S) requests.
$.ajaxStop here can also be bound to any HTML node that you
think might be modified by requst.
Update:
If you want to stick with ES syntax, then you can use Promise.all for known ajax methods:
Promise.all([ajax1(), ajax2()]).then(() => {
// all requests finished successfully
}).catch(() => {
// all requests finished but one or more failed
})
An interesting point here is that it works both with Promises and $.ajax requests.
Here is the jsFiddle demonstration.
Update 2:
Yet more recent version using async/await syntax:
try {
const results = await Promise.all([ajax1(), ajax2()])
// do other actions
} catch(ex) { }

I found a good answer by gnarf my self which is exactly what I was looking for :)
jQuery ajaxQueue
//This handles the queues
(function($) {
var ajaxQueue = $({});
$.ajaxQueue = function(ajaxOpts) {
var oldComplete = ajaxOpts.complete;
ajaxQueue.queue(function(next) {
ajaxOpts.complete = function() {
if (oldComplete) oldComplete.apply(this, arguments);
next();
};
$.ajax(ajaxOpts);
});
};
})(jQuery);
Then you can add a ajax request to the queue like this:
$.ajaxQueue({
url: 'page.php',
data: {id: 1},
type: 'POST',
success: function(data) {
$('#status').html(data);
}
});

Use the ajaxStop event.
For example, let's say you have a loading ... message while fetching 100 ajax requests and you want to hide that message once loaded.
From the jQuery doc:
$("#loading").ajaxStop(function() {
$(this).hide();
});
Do note that it will wait for all ajax requests being done on that page.

NOTE: The above answers use functionality that didn't exist at the time that this answer was written. I recommend using jQuery.when() instead of these approaches, but I'm leaving the answer for historical purposes.
-
You could probably get by with a simple counting semaphore, although how you implement it would be dependent on your code. A simple example would be something like...
var semaphore = 0, // counting semaphore for ajax requests
all_queued = false; // bool indicator to account for instances where the first request might finish before the second even starts
semaphore++;
$.get('ajax/test1.html', function(data) {
semaphore--;
if (all_queued && semaphore === 0) {
// process your custom stuff here
}
});
semaphore++;
$.get('ajax/test2.html', function(data) {
semaphore--;
if (all_queued && semaphore === 0) {
// process your custom stuff here
}
});
semaphore++;
$.get('ajax/test3.html', function(data) {
semaphore--;
if (all_queued && semaphore === 0) {
// process your custom stuff here
}
});
semaphore++;
$.get('ajax/test4.html', function(data) {
semaphore--;
if (all_queued && semaphore === 0) {
// process your custom stuff here
}
});
// now that all ajax requests are queued up, switch the bool to indicate it
all_queued = true;
If you wanted this to operate like {async: false} but you didn't want to lock the browser, you could accomplish the same thing with a jQuery queue.
var $queue = $("<div/>");
$queue.queue(function(){
$.get('ajax/test1.html', function(data) {
$queue.dequeue();
});
}).queue(function(){
$.get('ajax/test2.html', function(data) {
$queue.dequeue();
});
}).queue(function(){
$.get('ajax/test3.html', function(data) {
$queue.dequeue();
});
}).queue(function(){
$.get('ajax/test4.html', function(data) {
$queue.dequeue();
});
});

A little workaround is something like this:
// Define how many Ajax calls must be done
var ajaxCalls = 3;
var counter = 0;
var ajaxCallComplete = function() {
counter++;
if( counter >= ajaxCalls ) {
// When all ajax calls has been done
// Do something like hide waiting images, or any else function call
$('*').css('cursor', 'auto');
}
};
var loadPersons = function() {
// Show waiting image, or something else
$('*').css('cursor', 'wait');
var url = global.ctx + '/loadPersons';
$.getJSON(url, function(data) {
// Fun things
})
.complete(function() { **ajaxCallComplete();** });
};
var loadCountries = function() {
// Do things
var url = global.ctx + '/loadCountries';
$.getJSON(url, function(data) {
// Travels
})
.complete(function() { **ajaxCallComplete();** });
};
var loadCities = function() {
// Do things
var url = global.ctx + '/loadCities';
$.getJSON(url, function(data) {
// Travels
})
.complete(function() { **ajaxCallComplete();** });
};
$(document).ready(function(){
loadPersons();
loadCountries();
loadCities();
});
Hope can be useful...

javascript is event-based, so you should never wait, rather set hooks/callbacks
You can probably just use the success/complete methods of jquery.ajax
Or you could use .ajaxComplete :
$('.log').ajaxComplete(function(e, xhr, settings) {
if (settings.url == 'ajax/test.html') {
$(this).text('Triggered ajaxComplete handler.');
//and you can do whatever other processing here, including calling another function...
}
});
though youy should post a pseudocode of how your(s) ajax request(s) is(are) called to be more precise...

jQuery allows you to specify if you want the ajax request to be asynchronous or not. You can simply make the ajax requests synchronous and then the rest of the code won't execute until they return.
For example:
jQuery.ajax({
async: false,
//code
});

As other answers mentioned you can use ajaxStop() to wait until all ajax request are completed.
$(document).ajaxStop(function() {
// This function will be triggered every time any ajax request is requested and completed
});
If you want do it for an specific ajax() request the best you can do is use complete() method inside the certain ajax request:
$.ajax({
type: "POST",
url: "someUrl",
success: function(data) {
// This function will be triggered when ajax returns a 200 status code (success)
},
complete: function() {
// This function will be triggered always, when ajax request is completed, even it fails/returns other status code
},
error: function() {
// This will be triggered when ajax request fail.
}
});
But, If you need to wait only for a few and certain ajax request to be done? Use the wonderful javascript promises to wait until the these ajax you want to wait are done. I made a shortly, easy and readable example to show you how does promises works with ajax. Please take a look to the next example. I used setTimeout to clarify the example.
// Note:
// resolve() is used to mark the promise as resolved
// reject() is used to mark the promise as rejected
$(document).ready(function() {
$("button").on("click", function() {
var ajax1 = new Promise((resolve, reject) => {
$.ajax({
type: "GET",
url: "https://miro.medium.com/max/1200/0*UEtwA2ask7vQYW06.png",
xhrFields: { responseType: 'blob'},
success: function(data) {
setTimeout(function() {
$('#image1').attr("src", window.URL.createObjectURL(data));
resolve(" Promise ajax1 resolved");
}, 1000);
},
error: function() {
reject(" Promise ajax1 rejected");
},
});
});
var ajax2 = new Promise((resolve, reject) => {
$.ajax({
type: "GET",
url: "https://cdn1.iconfinder.com/data/icons/social-media-vol-1-1/24/_github-512.png",
xhrFields: { responseType: 'blob' },
success: function(data) {
setTimeout(function() {
$('#image2').attr("src", window.URL.createObjectURL(data));
resolve(" Promise ajax2 resolved");
}, 1500);
},
error: function() {
reject(" Promise ajax2 rejected");
},
});
});
var ajax3 = new Promise((resolve, reject) => {
$.ajax({
type: "GET",
url: "https://miro.medium.com/max/632/1*LUfpOf7teWvPdIPTBmYciA.png",
xhrFields: { responseType: 'blob' },
success: function(data) {
setTimeout(function() {
$('#image3').attr("src", window.URL.createObjectURL(data));
resolve(" Promise ajax3 resolved");
}, 2000);
},
error: function() {
reject(" Promise ajax3 rejected");
},
});
});
Promise.all([ajax1, ajax2, ajax3]).then(values => {
console.log("We waited until ajax ended: " + values);
console.log("My few ajax ended, lets do some things!!")
}, reason => {
console.log("Promises failed: " + reason);
});
// Or if you want wait for them individually do it like this
// ajax1.then(values => {
// console.log("Promise 1 resolved: " + values)
// }, reason => {
// console.log("Promise 1 failed: " + reason)
// });
});
});
img {
max-width: 200px;
max-height: 100px;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<button>Make AJAX request</button>
<div id="newContent">
<img id="image1" src="">
<img id="image2" src="">
<img id="image3" src="">
</div>

If you need something simple; once and done callback
//multiple ajax calls above
var callback = function () {
if ($.active !== 0) {
setTimeout(callback, '500');
return;
}
//whatever you need to do here
//...
};
callback();

Also you could use async.js.
I think its better than $.when because you can merge all kinds of asynchronous call that does not support promises out of the box like timeouts, SqlLite calls etc. and not just ajax requests.

On the basis of #BBonifield answer, I wrote a utility function so that semaphore logic is not spread in all the ajax calls.
untilAjax is the utility function which invokes a callback function when all the ajaxCalls are completed.
ajaxObjs is a array of ajax setting objects [http://api.jquery.com/jQuery.ajax/].
fn is callback function
function untilAjax(ajaxObjs, fn) {
if (!ajaxObjs || !fn) {
return;
}
var ajaxCount = ajaxObjs.length,
succ = null;
for (var i = 0; i < ajaxObjs.length; i++) { //append logic to invoke callback function once all the ajax calls are completed, in success handler.
succ = ajaxObjs[i]['success'];
ajaxObjs[i]['success'] = function(data) { //modified success handler
if (succ) {
succ(data);
}
ajaxCount--;
if (ajaxCount == 0) {
fn(); //modify statement suitably if you want 'this' keyword to refer to another object
}
};
$.ajax(ajaxObjs[i]); //make ajax call
succ = null;
};
Example: doSomething function uses untilAjax.
function doSomething() {
// variable declarations
untilAjax([{
url: 'url2',
dataType: 'json',
success: function(data) {
//do something with success data
}
}, {
url: 'url1',
dataType: 'json',
success: function(data) {
//do something with success data
}
}, {
url: 'url2',
dataType: 'json',
success: function(response) {
//do something with success data
}
}], function() {
// logic after all the calls are completed.
});
}

I highly recommend using $.when() if you're starting from scratch.
Even though this question has over million answers, I still didn't find anything useful for my case. Let's say you have to deal with an existing codebase, already making some ajax calls and don't want to introduce the complexity of promises and/or redo the whole thing.
We can easily take advantage of jQuery .data, .on and .trigger functions which have been a part of jQuery since forever.
Codepen
The good stuff about my solution is:
it's obvious what the callback exactly depends on
the function triggerNowOrOnLoaded doesn't care if the data has been already loaded or we're still waiting for it
it's super easy to plug it into an existing code
$(function() {
// wait for posts to be loaded
triggerNowOrOnLoaded("posts", function() {
var $body = $("body");
var posts = $body.data("posts");
$body.append("<div>Posts: " + posts.length + "</div>");
});
// some ajax requests
$.getJSON("https://jsonplaceholder.typicode.com/posts", function(data) {
$("body").data("posts", data).trigger("posts");
});
// doesn't matter if the `triggerNowOrOnLoaded` is called after or before the actual requests
$.getJSON("https://jsonplaceholder.typicode.com/users", function(data) {
$("body").data("users", data).trigger("users");
});
// wait for both types
triggerNowOrOnLoaded(["posts", "users"], function() {
var $body = $("body");
var posts = $body.data("posts");
var users = $body.data("users");
$body.append("<div>Posts: " + posts.length + " and Users: " + users.length + "</div>");
});
// works even if everything has already loaded!
setTimeout(function() {
// triggers immediately since users have been already loaded
triggerNowOrOnLoaded("users", function() {
var $body = $("body");
var users = $body.data("users");
$body.append("<div>Delayed Users: " + users.length + "</div>");
});
}, 2000); // 2 seconds
});
// helper function
function triggerNowOrOnLoaded(types, callback) {
types = $.isArray(types) ? types : [types];
var $body = $("body");
var waitForTypes = [];
$.each(types, function(i, type) {
if (typeof $body.data(type) === 'undefined') {
waitForTypes.push(type);
}
});
var isDataReady = waitForTypes.length === 0;
if (isDataReady) {
callback();
return;
}
// wait for the last type and run this function again for the rest of the types
var waitFor = waitForTypes.pop();
$body.on(waitFor, function() {
// remove event handler - we only want the stuff triggered once
$body.off(waitFor);
triggerNowOrOnLoaded(waitForTypes, callback);
});
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<body>Hi!</body>

I'm using size check when all ajax load completed
function get_ajax(link, data, callback) {
$.ajax({
url: link,
type: "GET",
data: data,
dataType: "json",
success: function (data, status, jqXHR) {
callback(jqXHR.status, data)
},
error: function (jqXHR, status, err) {
callback(jqXHR.status, jqXHR);
},
complete: function (jqXHR, status) {
}
})
}
function run_list_ajax(callback){
var size=0;
var max= 10;
for (let index = 0; index < max; index++) {
var link = 'http://api.jquery.com/ajaxStop/';
var data={i:index}
get_ajax(link,data,function(status, data){
console.log(index)
if(size>max-2){
callback('done')
}
size++
})
}
}
run_list_ajax(function(info){
console.log(info)
})
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.1/jquery.min.js"></script>

To expand upon Alex's answer, I have an example with variable arguments and promises. I wanted to load images via ajax and display them on the page after they all loaded.
To do that, I used the following:
let urlCreator = window.URL || window.webkitURL;
// Helper function for making ajax requests
let fetch = function(url) {
return $.ajax({
type: "get",
xhrFields: {
responseType: "blob"
},
url: url,
});
};
// Map the array of urls to an array of ajax requests
let urls = ["https://placekitten.com/200/250", "https://placekitten.com/300/250"];
let files = urls.map(url => fetch(url));
// Use the spread operator to wait for all requests
$.when(...files).then(function() {
// If we have multiple urls, then loop through
if(urls.length > 1) {
// Create image urls and tags for each result
Array.from(arguments).forEach(data => {
let imageUrl = urlCreator.createObjectURL(data[0]);
let img = `<img src=${imageUrl}>`;
$("#image_container").append(img);
});
}
else {
// Create image source and tag for result
let imageUrl = urlCreator.createObjectURL(arguments[0]);
let img = `<img src=${imageUrl}>`;
$("#image_container").append(img);
}
});
Updated to work for either single or multiple urls: https://jsfiddle.net/euypj5w9/

I found simple way, it using shift()
function waitReq(id)
{
jQuery.ajax(
{
type: 'POST',
url: ajaxurl,
data:
{
"page": id
},
success: function(resp)
{
...........
// check array length if not "0" continue to use next array value
if(ids.length)
{
waitReq(ids.shift()); // 2
)
},
error: function(resp)
{
....................
if(ids.length)
{
waitReq(ids.shift());
)
}
});
}
var ids = [1, 2, 3, 4, 5];
// shift() = delete first array value (then print)
waitReq(ids.shift()); // print 1

My solution is as follows
var request;
...
'services': {
'GetAddressBookData': function() {
//This is the primary service that loads all addressbook records
request = $.ajax({
type: "POST",
url: "Default.aspx/GetAddressBook",
contentType: "application/json;",
dataType: "json"
});
},
...
'apps': {
'AddressBook': {
'data': "",
'Start': function() {
...services.GetAddressBookData();
request.done(function(response) {
trace("ajax successful");
..apps.AddressBook.data = response['d'];
...apps.AddressBook.Filter();
});
request.fail(function(xhr, textStatus, errorThrown) {
trace("ajax failed - " + errorThrown);
});
Worked quite nicely. I've tried a lot of different ways of doing this, but I found this to be the simplest and most reusable. Hope it helps

Look at my solution:
1.Insert this function (and variable) into your javascript file:
var runFunctionQueue_callback;
function runFunctionQueue(f, index, callback) {
var next_index = index + 1
if (callback !== undefined) runFunctionQueue_callback = callback;
if (f[next_index] !== undefined) {
console.log(index + ' Next function avalaible -> ' + next_index);
$.ajax({
type: 'GET',
url: f[index].file,
data: (f[index].data),
complete: function() {
runFunctionQueue(f, next_index);
}
});
} else {
console.log(index + ' Last function');
$.ajax({
type: 'GET',
url: f[index].file,
data: (f[index].data),
async: false,
complete: runFunctionQueue_callback
});
}
}
2.Buil an array with your requests, like this:
var f = [
{file: 'file_path', data: {action: 'action', data: 'any_data}},
{file: 'file_path', data: {action: 'action', data: 'any_data}},
{file: 'file_path', data: {action: 'action', data: 'any_data}},
{file: 'file_path', data: {action: 'action', data: 'any_data}}
];
3.Create callback function:
function Function_callback() {
alert('done');
}
4.Call the runFunctionQueue function with parameters:
runFunctionQueue(f, 0, QuestionInsert_callback);
// first parameter: array with requests data
// second parameter: start from first request
// third parameter: the callback function

$.when doesn't work for me, callback(x) instead of return x worked as described here: https://stackoverflow.com/a/13455253/10357604

The below solution worked for me using $when
$.when(master.GetStateByName(stateName)).done(function(response) {
if (response) {
}
});
GetStateByName: function(stateName) {
return $.ajax({
type: 'POST',
url: getStatesByName + '?stateName=' + stateName,
async: false,
});
}

This is working for me
It's very simple
return $.ajax({
type: 'POST',
url: urlBaseUrl
data: {someData:someData},
dataType: "json",
success: function(resultData) {
}
});

Try this way. make a loop inside java script function to wait until the ajax call finished.
function getLabelById(id)
{
var label = '';
var done = false;
$.ajax({
cache: false,
url: "YourMvcActionUrl",
type: "GET",
dataType: "json",
async: false,
error: function (result) {
label='undefined';
done = true;
},
success: function (result) {
label = result.Message;
done = true;
}
});
//A loop to check done if ajax call is done.
while (!done)
{
setTimeout(function(){ },500); // take a sleep.
}
return label;
}

Javascript callback in each when all done [duplicate]

How do I make a function wait until all jQuery Ajax requests are done inside another function?
In short, I need to wait for all Ajax requests to be done before I execute the next. But how?

jQuery now defines a when function for this purpose.
It accepts any number of Deferred objects as arguments, and executes a function when all of them resolve.
That means, if you want to initiate (for example) four ajax requests, then perform an action when they are done, you could do something like this:
$.when(ajax1(), ajax2(), ajax3(), ajax4()).done(function(a1, a2, a3, a4){
// the code here will be executed when all four ajax requests resolve.
// a1, a2, a3 and a4 are lists of length 3 containing the response text,
// status, and jqXHR object for each of the four ajax calls respectively.
});
function ajax1() {
// NOTE: This function must return the value
// from calling the $.ajax() method.
return $.ajax({
url: "someUrl",
dataType: "json",
data: yourJsonData,
...
});
}
In my opinion, it makes for a clean and clear syntax, and avoids involving any global variables such as ajaxStart and ajaxStop, which could have unwanted side effects as your page develops.
If you don't know in advance how many ajax arguments you need to wait for (i.e. you want to use a variable number of arguments), it can still be done but is just a little bit trickier. See Pass in an array of Deferreds to $.when() (and maybe jQuery .when troubleshooting with variable number of arguments).
If you need deeper control over the failure modes of the ajax scripts etc., you can save the object returned by .when() - it's a jQuery Promise object encompassing all of the original ajax queries. You can call .then() or .fail() on it to add detailed success/failure handlers.

If you want to know when all ajax requests are finished in your document, no matter how many of them exists, just use $.ajaxStop event this way:
$(document).ajaxStop(function () {
// 0 === $.active
});
In this case, neither you need to guess how many requests are happening in the application, that might finish in the future, nor dig into functions complex logic or find which functions are doing HTTP(S) requests.
$.ajaxStop here can also be bound to any HTML node that you
think might be modified by requst.
Update:
If you want to stick with ES syntax, then you can use Promise.all for known ajax methods:
Promise.all([ajax1(), ajax2()]).then(() => {
// all requests finished successfully
}).catch(() => {
// all requests finished but one or more failed
})
An interesting point here is that it works both with Promises and $.ajax requests.
Here is the jsFiddle demonstration.
Update 2:
Yet more recent version using async/await syntax:
try {
const results = await Promise.all([ajax1(), ajax2()])
// do other actions
} catch(ex) { }

I found a good answer by gnarf my self which is exactly what I was looking for :)
jQuery ajaxQueue
//This handles the queues
(function($) {
var ajaxQueue = $({});
$.ajaxQueue = function(ajaxOpts) {
var oldComplete = ajaxOpts.complete;
ajaxQueue.queue(function(next) {
ajaxOpts.complete = function() {
if (oldComplete) oldComplete.apply(this, arguments);
next();
};
$.ajax(ajaxOpts);
});
};
})(jQuery);
Then you can add a ajax request to the queue like this:
$.ajaxQueue({
url: 'page.php',
data: {id: 1},
type: 'POST',
success: function(data) {
$('#status').html(data);
}
});

Use the ajaxStop event.
For example, let's say you have a loading ... message while fetching 100 ajax requests and you want to hide that message once loaded.
From the jQuery doc:
$("#loading").ajaxStop(function() {
$(this).hide();
});
Do note that it will wait for all ajax requests being done on that page.

NOTE: The above answers use functionality that didn't exist at the time that this answer was written. I recommend using jQuery.when() instead of these approaches, but I'm leaving the answer for historical purposes.
-
You could probably get by with a simple counting semaphore, although how you implement it would be dependent on your code. A simple example would be something like...
var semaphore = 0, // counting semaphore for ajax requests
all_queued = false; // bool indicator to account for instances where the first request might finish before the second even starts
semaphore++;
$.get('ajax/test1.html', function(data) {
semaphore--;
if (all_queued && semaphore === 0) {
// process your custom stuff here
}
});
semaphore++;
$.get('ajax/test2.html', function(data) {
semaphore--;
if (all_queued && semaphore === 0) {
// process your custom stuff here
}
});
semaphore++;
$.get('ajax/test3.html', function(data) {
semaphore--;
if (all_queued && semaphore === 0) {
// process your custom stuff here
}
});
semaphore++;
$.get('ajax/test4.html', function(data) {
semaphore--;
if (all_queued && semaphore === 0) {
// process your custom stuff here
}
});
// now that all ajax requests are queued up, switch the bool to indicate it
all_queued = true;
If you wanted this to operate like {async: false} but you didn't want to lock the browser, you could accomplish the same thing with a jQuery queue.
var $queue = $("<div/>");
$queue.queue(function(){
$.get('ajax/test1.html', function(data) {
$queue.dequeue();
});
}).queue(function(){
$.get('ajax/test2.html', function(data) {
$queue.dequeue();
});
}).queue(function(){
$.get('ajax/test3.html', function(data) {
$queue.dequeue();
});
}).queue(function(){
$.get('ajax/test4.html', function(data) {
$queue.dequeue();
});
});

A little workaround is something like this:
// Define how many Ajax calls must be done
var ajaxCalls = 3;
var counter = 0;
var ajaxCallComplete = function() {
counter++;
if( counter >= ajaxCalls ) {
// When all ajax calls has been done
// Do something like hide waiting images, or any else function call
$('*').css('cursor', 'auto');
}
};
var loadPersons = function() {
// Show waiting image, or something else
$('*').css('cursor', 'wait');
var url = global.ctx + '/loadPersons';
$.getJSON(url, function(data) {
// Fun things
})
.complete(function() { **ajaxCallComplete();** });
};
var loadCountries = function() {
// Do things
var url = global.ctx + '/loadCountries';
$.getJSON(url, function(data) {
// Travels
})
.complete(function() { **ajaxCallComplete();** });
};
var loadCities = function() {
// Do things
var url = global.ctx + '/loadCities';
$.getJSON(url, function(data) {
// Travels
})
.complete(function() { **ajaxCallComplete();** });
};
$(document).ready(function(){
loadPersons();
loadCountries();
loadCities();
});
Hope can be useful...

javascript is event-based, so you should never wait, rather set hooks/callbacks
You can probably just use the success/complete methods of jquery.ajax
Or you could use .ajaxComplete :
$('.log').ajaxComplete(function(e, xhr, settings) {
if (settings.url == 'ajax/test.html') {
$(this).text('Triggered ajaxComplete handler.');
//and you can do whatever other processing here, including calling another function...
}
});
though youy should post a pseudocode of how your(s) ajax request(s) is(are) called to be more precise...

jQuery allows you to specify if you want the ajax request to be asynchronous or not. You can simply make the ajax requests synchronous and then the rest of the code won't execute until they return.
For example:
jQuery.ajax({
async: false,
//code
});

As other answers mentioned you can use ajaxStop() to wait until all ajax request are completed.
$(document).ajaxStop(function() {
// This function will be triggered every time any ajax request is requested and completed
});
If you want do it for an specific ajax() request the best you can do is use complete() method inside the certain ajax request:
$.ajax({
type: "POST",
url: "someUrl",
success: function(data) {
// This function will be triggered when ajax returns a 200 status code (success)
},
complete: function() {
// This function will be triggered always, when ajax request is completed, even it fails/returns other status code
},
error: function() {
// This will be triggered when ajax request fail.
}
});
But, If you need to wait only for a few and certain ajax request to be done? Use the wonderful javascript promises to wait until the these ajax you want to wait are done. I made a shortly, easy and readable example to show you how does promises works with ajax. Please take a look to the next example. I used setTimeout to clarify the example.
// Note:
// resolve() is used to mark the promise as resolved
// reject() is used to mark the promise as rejected
$(document).ready(function() {
$("button").on("click", function() {
var ajax1 = new Promise((resolve, reject) => {
$.ajax({
type: "GET",
url: "https://miro.medium.com/max/1200/0*UEtwA2ask7vQYW06.png",
xhrFields: { responseType: 'blob'},
success: function(data) {
setTimeout(function() {
$('#image1').attr("src", window.URL.createObjectURL(data));
resolve(" Promise ajax1 resolved");
}, 1000);
},
error: function() {
reject(" Promise ajax1 rejected");
},
});
});
var ajax2 = new Promise((resolve, reject) => {
$.ajax({
type: "GET",
url: "https://cdn1.iconfinder.com/data/icons/social-media-vol-1-1/24/_github-512.png",
xhrFields: { responseType: 'blob' },
success: function(data) {
setTimeout(function() {
$('#image2').attr("src", window.URL.createObjectURL(data));
resolve(" Promise ajax2 resolved");
}, 1500);
},
error: function() {
reject(" Promise ajax2 rejected");
},
});
});
var ajax3 = new Promise((resolve, reject) => {
$.ajax({
type: "GET",
url: "https://miro.medium.com/max/632/1*LUfpOf7teWvPdIPTBmYciA.png",
xhrFields: { responseType: 'blob' },
success: function(data) {
setTimeout(function() {
$('#image3').attr("src", window.URL.createObjectURL(data));
resolve(" Promise ajax3 resolved");
}, 2000);
},
error: function() {
reject(" Promise ajax3 rejected");
},
});
});
Promise.all([ajax1, ajax2, ajax3]).then(values => {
console.log("We waited until ajax ended: " + values);
console.log("My few ajax ended, lets do some things!!")
}, reason => {
console.log("Promises failed: " + reason);
});
// Or if you want wait for them individually do it like this
// ajax1.then(values => {
// console.log("Promise 1 resolved: " + values)
// }, reason => {
// console.log("Promise 1 failed: " + reason)
// });
});
});
img {
max-width: 200px;
max-height: 100px;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<button>Make AJAX request</button>
<div id="newContent">
<img id="image1" src="">
<img id="image2" src="">
<img id="image3" src="">
</div>

If you need something simple; once and done callback
//multiple ajax calls above
var callback = function () {
if ($.active !== 0) {
setTimeout(callback, '500');
return;
}
//whatever you need to do here
//...
};
callback();

Also you could use async.js.
I think its better than $.when because you can merge all kinds of asynchronous call that does not support promises out of the box like timeouts, SqlLite calls etc. and not just ajax requests.

On the basis of #BBonifield answer, I wrote a utility function so that semaphore logic is not spread in all the ajax calls.
untilAjax is the utility function which invokes a callback function when all the ajaxCalls are completed.
ajaxObjs is a array of ajax setting objects [http://api.jquery.com/jQuery.ajax/].
fn is callback function
function untilAjax(ajaxObjs, fn) {
if (!ajaxObjs || !fn) {
return;
}
var ajaxCount = ajaxObjs.length,
succ = null;
for (var i = 0; i < ajaxObjs.length; i++) { //append logic to invoke callback function once all the ajax calls are completed, in success handler.
succ = ajaxObjs[i]['success'];
ajaxObjs[i]['success'] = function(data) { //modified success handler
if (succ) {
succ(data);
}
ajaxCount--;
if (ajaxCount == 0) {
fn(); //modify statement suitably if you want 'this' keyword to refer to another object
}
};
$.ajax(ajaxObjs[i]); //make ajax call
succ = null;
};
Example: doSomething function uses untilAjax.
function doSomething() {
// variable declarations
untilAjax([{
url: 'url2',
dataType: 'json',
success: function(data) {
//do something with success data
}
}, {
url: 'url1',
dataType: 'json',
success: function(data) {
//do something with success data
}
}, {
url: 'url2',
dataType: 'json',
success: function(response) {
//do something with success data
}
}], function() {
// logic after all the calls are completed.
});
}

I highly recommend using $.when() if you're starting from scratch.
Even though this question has over million answers, I still didn't find anything useful for my case. Let's say you have to deal with an existing codebase, already making some ajax calls and don't want to introduce the complexity of promises and/or redo the whole thing.
We can easily take advantage of jQuery .data, .on and .trigger functions which have been a part of jQuery since forever.
Codepen
The good stuff about my solution is:
it's obvious what the callback exactly depends on
the function triggerNowOrOnLoaded doesn't care if the data has been already loaded or we're still waiting for it
it's super easy to plug it into an existing code
$(function() {
// wait for posts to be loaded
triggerNowOrOnLoaded("posts", function() {
var $body = $("body");
var posts = $body.data("posts");
$body.append("<div>Posts: " + posts.length + "</div>");
});
// some ajax requests
$.getJSON("https://jsonplaceholder.typicode.com/posts", function(data) {
$("body").data("posts", data).trigger("posts");
});
// doesn't matter if the `triggerNowOrOnLoaded` is called after or before the actual requests
$.getJSON("https://jsonplaceholder.typicode.com/users", function(data) {
$("body").data("users", data).trigger("users");
});
// wait for both types
triggerNowOrOnLoaded(["posts", "users"], function() {
var $body = $("body");
var posts = $body.data("posts");
var users = $body.data("users");
$body.append("<div>Posts: " + posts.length + " and Users: " + users.length + "</div>");
});
// works even if everything has already loaded!
setTimeout(function() {
// triggers immediately since users have been already loaded
triggerNowOrOnLoaded("users", function() {
var $body = $("body");
var users = $body.data("users");
$body.append("<div>Delayed Users: " + users.length + "</div>");
});
}, 2000); // 2 seconds
});
// helper function
function triggerNowOrOnLoaded(types, callback) {
types = $.isArray(types) ? types : [types];
var $body = $("body");
var waitForTypes = [];
$.each(types, function(i, type) {
if (typeof $body.data(type) === 'undefined') {
waitForTypes.push(type);
}
});
var isDataReady = waitForTypes.length === 0;
if (isDataReady) {
callback();
return;
}
// wait for the last type and run this function again for the rest of the types
var waitFor = waitForTypes.pop();
$body.on(waitFor, function() {
// remove event handler - we only want the stuff triggered once
$body.off(waitFor);
triggerNowOrOnLoaded(waitForTypes, callback);
});
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<body>Hi!</body>

I'm using size check when all ajax load completed
function get_ajax(link, data, callback) {
$.ajax({
url: link,
type: "GET",
data: data,
dataType: "json",
success: function (data, status, jqXHR) {
callback(jqXHR.status, data)
},
error: function (jqXHR, status, err) {
callback(jqXHR.status, jqXHR);
},
complete: function (jqXHR, status) {
}
})
}
function run_list_ajax(callback){
var size=0;
var max= 10;
for (let index = 0; index < max; index++) {
var link = 'http://api.jquery.com/ajaxStop/';
var data={i:index}
get_ajax(link,data,function(status, data){
console.log(index)
if(size>max-2){
callback('done')
}
size++
})
}
}
run_list_ajax(function(info){
console.log(info)
})
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.1/jquery.min.js"></script>

To expand upon Alex's answer, I have an example with variable arguments and promises. I wanted to load images via ajax and display them on the page after they all loaded.
To do that, I used the following:
let urlCreator = window.URL || window.webkitURL;
// Helper function for making ajax requests
let fetch = function(url) {
return $.ajax({
type: "get",
xhrFields: {
responseType: "blob"
},
url: url,
});
};
// Map the array of urls to an array of ajax requests
let urls = ["https://placekitten.com/200/250", "https://placekitten.com/300/250"];
let files = urls.map(url => fetch(url));
// Use the spread operator to wait for all requests
$.when(...files).then(function() {
// If we have multiple urls, then loop through
if(urls.length > 1) {
// Create image urls and tags for each result
Array.from(arguments).forEach(data => {
let imageUrl = urlCreator.createObjectURL(data[0]);
let img = `<img src=${imageUrl}>`;
$("#image_container").append(img);
});
}
else {
// Create image source and tag for result
let imageUrl = urlCreator.createObjectURL(arguments[0]);
let img = `<img src=${imageUrl}>`;
$("#image_container").append(img);
}
});
Updated to work for either single or multiple urls: https://jsfiddle.net/euypj5w9/

I found simple way, it using shift()
function waitReq(id)
{
jQuery.ajax(
{
type: 'POST',
url: ajaxurl,
data:
{
"page": id
},
success: function(resp)
{
...........
// check array length if not "0" continue to use next array value
if(ids.length)
{
waitReq(ids.shift()); // 2
)
},
error: function(resp)
{
....................
if(ids.length)
{
waitReq(ids.shift());
)
}
});
}
var ids = [1, 2, 3, 4, 5];
// shift() = delete first array value (then print)
waitReq(ids.shift()); // print 1

My solution is as follows
var request;
...
'services': {
'GetAddressBookData': function() {
//This is the primary service that loads all addressbook records
request = $.ajax({
type: "POST",
url: "Default.aspx/GetAddressBook",
contentType: "application/json;",
dataType: "json"
});
},
...
'apps': {
'AddressBook': {
'data': "",
'Start': function() {
...services.GetAddressBookData();
request.done(function(response) {
trace("ajax successful");
..apps.AddressBook.data = response['d'];
...apps.AddressBook.Filter();
});
request.fail(function(xhr, textStatus, errorThrown) {
trace("ajax failed - " + errorThrown);
});
Worked quite nicely. I've tried a lot of different ways of doing this, but I found this to be the simplest and most reusable. Hope it helps

Look at my solution:
1.Insert this function (and variable) into your javascript file:
var runFunctionQueue_callback;
function runFunctionQueue(f, index, callback) {
var next_index = index + 1
if (callback !== undefined) runFunctionQueue_callback = callback;
if (f[next_index] !== undefined) {
console.log(index + ' Next function avalaible -> ' + next_index);
$.ajax({
type: 'GET',
url: f[index].file,
data: (f[index].data),
complete: function() {
runFunctionQueue(f, next_index);
}
});
} else {
console.log(index + ' Last function');
$.ajax({
type: 'GET',
url: f[index].file,
data: (f[index].data),
async: false,
complete: runFunctionQueue_callback
});
}
}
2.Buil an array with your requests, like this:
var f = [
{file: 'file_path', data: {action: 'action', data: 'any_data}},
{file: 'file_path', data: {action: 'action', data: 'any_data}},
{file: 'file_path', data: {action: 'action', data: 'any_data}},
{file: 'file_path', data: {action: 'action', data: 'any_data}}
];
3.Create callback function:
function Function_callback() {
alert('done');
}
4.Call the runFunctionQueue function with parameters:
runFunctionQueue(f, 0, QuestionInsert_callback);
// first parameter: array with requests data
// second parameter: start from first request
// third parameter: the callback function

$.when doesn't work for me, callback(x) instead of return x worked as described here: https://stackoverflow.com/a/13455253/10357604

The below solution worked for me using $when
$.when(master.GetStateByName(stateName)).done(function(response) {
if (response) {
}
});
GetStateByName: function(stateName) {
return $.ajax({
type: 'POST',
url: getStatesByName + '?stateName=' + stateName,
async: false,
});
}

This is working for me
It's very simple
return $.ajax({
type: 'POST',
url: urlBaseUrl
data: {someData:someData},
dataType: "json",
success: function(resultData) {
}
});

Try this way. make a loop inside java script function to wait until the ajax call finished.
function getLabelById(id)
{
var label = '';
var done = false;
$.ajax({
cache: false,
url: "YourMvcActionUrl",
type: "GET",
dataType: "json",
async: false,
error: function (result) {
label='undefined';
done = true;
},
success: function (result) {
label = result.Message;
done = true;
}
});
//A loop to check done if ajax call is done.
while (!done)
{
setTimeout(function(){ },500); // take a sleep.
}
return label;
}

multiple ajax with async doesn't work [duplicate]

How do I make a function wait until all jQuery Ajax requests are done inside another function?
In short, I need to wait for all Ajax requests to be done before I execute the next. But how?

jQuery now defines a when function for this purpose.
It accepts any number of Deferred objects as arguments, and executes a function when all of them resolve.
That means, if you want to initiate (for example) four ajax requests, then perform an action when they are done, you could do something like this:
$.when(ajax1(), ajax2(), ajax3(), ajax4()).done(function(a1, a2, a3, a4){
// the code here will be executed when all four ajax requests resolve.
// a1, a2, a3 and a4 are lists of length 3 containing the response text,
// status, and jqXHR object for each of the four ajax calls respectively.
});
function ajax1() {
// NOTE: This function must return the value
// from calling the $.ajax() method.
return $.ajax({
url: "someUrl",
dataType: "json",
data: yourJsonData,
...
});
}
In my opinion, it makes for a clean and clear syntax, and avoids involving any global variables such as ajaxStart and ajaxStop, which could have unwanted side effects as your page develops.
If you don't know in advance how many ajax arguments you need to wait for (i.e. you want to use a variable number of arguments), it can still be done but is just a little bit trickier. See Pass in an array of Deferreds to $.when() (and maybe jQuery .when troubleshooting with variable number of arguments).
If you need deeper control over the failure modes of the ajax scripts etc., you can save the object returned by .when() - it's a jQuery Promise object encompassing all of the original ajax queries. You can call .then() or .fail() on it to add detailed success/failure handlers.

If you want to know when all ajax requests are finished in your document, no matter how many of them exists, just use $.ajaxStop event this way:
$(document).ajaxStop(function () {
// 0 === $.active
});
In this case, neither you need to guess how many requests are happening in the application, that might finish in the future, nor dig into functions complex logic or find which functions are doing HTTP(S) requests.
$.ajaxStop here can also be bound to any HTML node that you
think might be modified by requst.
Update:
If you want to stick with ES syntax, then you can use Promise.all for known ajax methods:
Promise.all([ajax1(), ajax2()]).then(() => {
// all requests finished successfully
}).catch(() => {
// all requests finished but one or more failed
})
An interesting point here is that it works both with Promises and $.ajax requests.
Here is the jsFiddle demonstration.
Update 2:
Yet more recent version using async/await syntax:
try {
const results = await Promise.all([ajax1(), ajax2()])
// do other actions
} catch(ex) { }

I found a good answer by gnarf my self which is exactly what I was looking for :)
jQuery ajaxQueue
//This handles the queues
(function($) {
var ajaxQueue = $({});
$.ajaxQueue = function(ajaxOpts) {
var oldComplete = ajaxOpts.complete;
ajaxQueue.queue(function(next) {
ajaxOpts.complete = function() {
if (oldComplete) oldComplete.apply(this, arguments);
next();
};
$.ajax(ajaxOpts);
});
};
})(jQuery);
Then you can add a ajax request to the queue like this:
$.ajaxQueue({
url: 'page.php',
data: {id: 1},
type: 'POST',
success: function(data) {
$('#status').html(data);
}
});

Use the ajaxStop event.
For example, let's say you have a loading ... message while fetching 100 ajax requests and you want to hide that message once loaded.
From the jQuery doc:
$("#loading").ajaxStop(function() {
$(this).hide();
});
Do note that it will wait for all ajax requests being done on that page.

NOTE: The above answers use functionality that didn't exist at the time that this answer was written. I recommend using jQuery.when() instead of these approaches, but I'm leaving the answer for historical purposes.
-
You could probably get by with a simple counting semaphore, although how you implement it would be dependent on your code. A simple example would be something like...
var semaphore = 0, // counting semaphore for ajax requests
all_queued = false; // bool indicator to account for instances where the first request might finish before the second even starts
semaphore++;
$.get('ajax/test1.html', function(data) {
semaphore--;
if (all_queued && semaphore === 0) {
// process your custom stuff here
}
});
semaphore++;
$.get('ajax/test2.html', function(data) {
semaphore--;
if (all_queued && semaphore === 0) {
// process your custom stuff here
}
});
semaphore++;
$.get('ajax/test3.html', function(data) {
semaphore--;
if (all_queued && semaphore === 0) {
// process your custom stuff here
}
});
semaphore++;
$.get('ajax/test4.html', function(data) {
semaphore--;
if (all_queued && semaphore === 0) {
// process your custom stuff here
}
});
// now that all ajax requests are queued up, switch the bool to indicate it
all_queued = true;
If you wanted this to operate like {async: false} but you didn't want to lock the browser, you could accomplish the same thing with a jQuery queue.
var $queue = $("<div/>");
$queue.queue(function(){
$.get('ajax/test1.html', function(data) {
$queue.dequeue();
});
}).queue(function(){
$.get('ajax/test2.html', function(data) {
$queue.dequeue();
});
}).queue(function(){
$.get('ajax/test3.html', function(data) {
$queue.dequeue();
});
}).queue(function(){
$.get('ajax/test4.html', function(data) {
$queue.dequeue();
});
});

A little workaround is something like this:
// Define how many Ajax calls must be done
var ajaxCalls = 3;
var counter = 0;
var ajaxCallComplete = function() {
counter++;
if( counter >= ajaxCalls ) {
// When all ajax calls has been done
// Do something like hide waiting images, or any else function call
$('*').css('cursor', 'auto');
}
};
var loadPersons = function() {
// Show waiting image, or something else
$('*').css('cursor', 'wait');
var url = global.ctx + '/loadPersons';
$.getJSON(url, function(data) {
// Fun things
})
.complete(function() { **ajaxCallComplete();** });
};
var loadCountries = function() {
// Do things
var url = global.ctx + '/loadCountries';
$.getJSON(url, function(data) {
// Travels
})
.complete(function() { **ajaxCallComplete();** });
};
var loadCities = function() {
// Do things
var url = global.ctx + '/loadCities';
$.getJSON(url, function(data) {
// Travels
})
.complete(function() { **ajaxCallComplete();** });
};
$(document).ready(function(){
loadPersons();
loadCountries();
loadCities();
});
Hope can be useful...

javascript is event-based, so you should never wait, rather set hooks/callbacks
You can probably just use the success/complete methods of jquery.ajax
Or you could use .ajaxComplete :
$('.log').ajaxComplete(function(e, xhr, settings) {
if (settings.url == 'ajax/test.html') {
$(this).text('Triggered ajaxComplete handler.');
//and you can do whatever other processing here, including calling another function...
}
});
though youy should post a pseudocode of how your(s) ajax request(s) is(are) called to be more precise...

jQuery allows you to specify if you want the ajax request to be asynchronous or not. You can simply make the ajax requests synchronous and then the rest of the code won't execute until they return.
For example:
jQuery.ajax({
async: false,
//code
});

As other answers mentioned you can use ajaxStop() to wait until all ajax request are completed.
$(document).ajaxStop(function() {
// This function will be triggered every time any ajax request is requested and completed
});
If you want do it for an specific ajax() request the best you can do is use complete() method inside the certain ajax request:
$.ajax({
type: "POST",
url: "someUrl",
success: function(data) {
// This function will be triggered when ajax returns a 200 status code (success)
},
complete: function() {
// This function will be triggered always, when ajax request is completed, even it fails/returns other status code
},
error: function() {
// This will be triggered when ajax request fail.
}
});
But, If you need to wait only for a few and certain ajax request to be done? Use the wonderful javascript promises to wait until the these ajax you want to wait are done. I made a shortly, easy and readable example to show you how does promises works with ajax. Please take a look to the next example. I used setTimeout to clarify the example.
// Note:
// resolve() is used to mark the promise as resolved
// reject() is used to mark the promise as rejected
$(document).ready(function() {
$("button").on("click", function() {
var ajax1 = new Promise((resolve, reject) => {
$.ajax({
type: "GET",
url: "https://miro.medium.com/max/1200/0*UEtwA2ask7vQYW06.png",
xhrFields: { responseType: 'blob'},
success: function(data) {
setTimeout(function() {
$('#image1').attr("src", window.URL.createObjectURL(data));
resolve(" Promise ajax1 resolved");
}, 1000);
},
error: function() {
reject(" Promise ajax1 rejected");
},
});
});
var ajax2 = new Promise((resolve, reject) => {
$.ajax({
type: "GET",
url: "https://cdn1.iconfinder.com/data/icons/social-media-vol-1-1/24/_github-512.png",
xhrFields: { responseType: 'blob' },
success: function(data) {
setTimeout(function() {
$('#image2').attr("src", window.URL.createObjectURL(data));
resolve(" Promise ajax2 resolved");
}, 1500);
},
error: function() {
reject(" Promise ajax2 rejected");
},
});
});
var ajax3 = new Promise((resolve, reject) => {
$.ajax({
type: "GET",
url: "https://miro.medium.com/max/632/1*LUfpOf7teWvPdIPTBmYciA.png",
xhrFields: { responseType: 'blob' },
success: function(data) {
setTimeout(function() {
$('#image3').attr("src", window.URL.createObjectURL(data));
resolve(" Promise ajax3 resolved");
}, 2000);
},
error: function() {
reject(" Promise ajax3 rejected");
},
});
});
Promise.all([ajax1, ajax2, ajax3]).then(values => {
console.log("We waited until ajax ended: " + values);
console.log("My few ajax ended, lets do some things!!")
}, reason => {
console.log("Promises failed: " + reason);
});
// Or if you want wait for them individually do it like this
// ajax1.then(values => {
// console.log("Promise 1 resolved: " + values)
// }, reason => {
// console.log("Promise 1 failed: " + reason)
// });
});
});
img {
max-width: 200px;
max-height: 100px;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<button>Make AJAX request</button>
<div id="newContent">
<img id="image1" src="">
<img id="image2" src="">
<img id="image3" src="">
</div>

If you need something simple; once and done callback
//multiple ajax calls above
var callback = function () {
if ($.active !== 0) {
setTimeout(callback, '500');
return;
}
//whatever you need to do here
//...
};
callback();

Also you could use async.js.
I think its better than $.when because you can merge all kinds of asynchronous call that does not support promises out of the box like timeouts, SqlLite calls etc. and not just ajax requests.

On the basis of #BBonifield answer, I wrote a utility function so that semaphore logic is not spread in all the ajax calls.
untilAjax is the utility function which invokes a callback function when all the ajaxCalls are completed.
ajaxObjs is a array of ajax setting objects [http://api.jquery.com/jQuery.ajax/].
fn is callback function
function untilAjax(ajaxObjs, fn) {
if (!ajaxObjs || !fn) {
return;
}
var ajaxCount = ajaxObjs.length,
succ = null;
for (var i = 0; i < ajaxObjs.length; i++) { //append logic to invoke callback function once all the ajax calls are completed, in success handler.
succ = ajaxObjs[i]['success'];
ajaxObjs[i]['success'] = function(data) { //modified success handler
if (succ) {
succ(data);
}
ajaxCount--;
if (ajaxCount == 0) {
fn(); //modify statement suitably if you want 'this' keyword to refer to another object
}
};
$.ajax(ajaxObjs[i]); //make ajax call
succ = null;
};
Example: doSomething function uses untilAjax.
function doSomething() {
// variable declarations
untilAjax([{
url: 'url2',
dataType: 'json',
success: function(data) {
//do something with success data
}
}, {
url: 'url1',
dataType: 'json',
success: function(data) {
//do something with success data
}
}, {
url: 'url2',
dataType: 'json',
success: function(response) {
//do something with success data
}
}], function() {
// logic after all the calls are completed.
});
}

I highly recommend using $.when() if you're starting from scratch.
Even though this question has over million answers, I still didn't find anything useful for my case. Let's say you have to deal with an existing codebase, already making some ajax calls and don't want to introduce the complexity of promises and/or redo the whole thing.
We can easily take advantage of jQuery .data, .on and .trigger functions which have been a part of jQuery since forever.
Codepen
The good stuff about my solution is:
it's obvious what the callback exactly depends on
the function triggerNowOrOnLoaded doesn't care if the data has been already loaded or we're still waiting for it
it's super easy to plug it into an existing code
$(function() {
// wait for posts to be loaded
triggerNowOrOnLoaded("posts", function() {
var $body = $("body");
var posts = $body.data("posts");
$body.append("<div>Posts: " + posts.length + "</div>");
});
// some ajax requests
$.getJSON("https://jsonplaceholder.typicode.com/posts", function(data) {
$("body").data("posts", data).trigger("posts");
});
// doesn't matter if the `triggerNowOrOnLoaded` is called after or before the actual requests
$.getJSON("https://jsonplaceholder.typicode.com/users", function(data) {
$("body").data("users", data).trigger("users");
});
// wait for both types
triggerNowOrOnLoaded(["posts", "users"], function() {
var $body = $("body");
var posts = $body.data("posts");
var users = $body.data("users");
$body.append("<div>Posts: " + posts.length + " and Users: " + users.length + "</div>");
});
// works even if everything has already loaded!
setTimeout(function() {
// triggers immediately since users have been already loaded
triggerNowOrOnLoaded("users", function() {
var $body = $("body");
var users = $body.data("users");
$body.append("<div>Delayed Users: " + users.length + "</div>");
});
}, 2000); // 2 seconds
});
// helper function
function triggerNowOrOnLoaded(types, callback) {
types = $.isArray(types) ? types : [types];
var $body = $("body");
var waitForTypes = [];
$.each(types, function(i, type) {
if (typeof $body.data(type) === 'undefined') {
waitForTypes.push(type);
}
});
var isDataReady = waitForTypes.length === 0;
if (isDataReady) {
callback();
return;
}
// wait for the last type and run this function again for the rest of the types
var waitFor = waitForTypes.pop();
$body.on(waitFor, function() {
// remove event handler - we only want the stuff triggered once
$body.off(waitFor);
triggerNowOrOnLoaded(waitForTypes, callback);
});
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<body>Hi!</body>

I'm using size check when all ajax load completed
function get_ajax(link, data, callback) {
$.ajax({
url: link,
type: "GET",
data: data,
dataType: "json",
success: function (data, status, jqXHR) {
callback(jqXHR.status, data)
},
error: function (jqXHR, status, err) {
callback(jqXHR.status, jqXHR);
},
complete: function (jqXHR, status) {
}
})
}
function run_list_ajax(callback){
var size=0;
var max= 10;
for (let index = 0; index < max; index++) {
var link = 'http://api.jquery.com/ajaxStop/';
var data={i:index}
get_ajax(link,data,function(status, data){
console.log(index)
if(size>max-2){
callback('done')
}
size++
})
}
}
run_list_ajax(function(info){
console.log(info)
})
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.1/jquery.min.js"></script>

To expand upon Alex's answer, I have an example with variable arguments and promises. I wanted to load images via ajax and display them on the page after they all loaded.
To do that, I used the following:
let urlCreator = window.URL || window.webkitURL;
// Helper function for making ajax requests
let fetch = function(url) {
return $.ajax({
type: "get",
xhrFields: {
responseType: "blob"
},
url: url,
});
};
// Map the array of urls to an array of ajax requests
let urls = ["https://placekitten.com/200/250", "https://placekitten.com/300/250"];
let files = urls.map(url => fetch(url));
// Use the spread operator to wait for all requests
$.when(...files).then(function() {
// If we have multiple urls, then loop through
if(urls.length > 1) {
// Create image urls and tags for each result
Array.from(arguments).forEach(data => {
let imageUrl = urlCreator.createObjectURL(data[0]);
let img = `<img src=${imageUrl}>`;
$("#image_container").append(img);
});
}
else {
// Create image source and tag for result
let imageUrl = urlCreator.createObjectURL(arguments[0]);
let img = `<img src=${imageUrl}>`;
$("#image_container").append(img);
}
});
Updated to work for either single or multiple urls: https://jsfiddle.net/euypj5w9/

I found simple way, it using shift()
function waitReq(id)
{
jQuery.ajax(
{
type: 'POST',
url: ajaxurl,
data:
{
"page": id
},
success: function(resp)
{
...........
// check array length if not "0" continue to use next array value
if(ids.length)
{
waitReq(ids.shift()); // 2
)
},
error: function(resp)
{
....................
if(ids.length)
{
waitReq(ids.shift());
)
}
});
}
var ids = [1, 2, 3, 4, 5];
// shift() = delete first array value (then print)
waitReq(ids.shift()); // print 1

My solution is as follows
var request;
...
'services': {
'GetAddressBookData': function() {
//This is the primary service that loads all addressbook records
request = $.ajax({
type: "POST",
url: "Default.aspx/GetAddressBook",
contentType: "application/json;",
dataType: "json"
});
},
...
'apps': {
'AddressBook': {
'data': "",
'Start': function() {
...services.GetAddressBookData();
request.done(function(response) {
trace("ajax successful");
..apps.AddressBook.data = response['d'];
...apps.AddressBook.Filter();
});
request.fail(function(xhr, textStatus, errorThrown) {
trace("ajax failed - " + errorThrown);
});
Worked quite nicely. I've tried a lot of different ways of doing this, but I found this to be the simplest and most reusable. Hope it helps

Look at my solution:
1.Insert this function (and variable) into your javascript file:
var runFunctionQueue_callback;
function runFunctionQueue(f, index, callback) {
var next_index = index + 1
if (callback !== undefined) runFunctionQueue_callback = callback;
if (f[next_index] !== undefined) {
console.log(index + ' Next function avalaible -> ' + next_index);
$.ajax({
type: 'GET',
url: f[index].file,
data: (f[index].data),
complete: function() {
runFunctionQueue(f, next_index);
}
});
} else {
console.log(index + ' Last function');
$.ajax({
type: 'GET',
url: f[index].file,
data: (f[index].data),
async: false,
complete: runFunctionQueue_callback
});
}
}
2.Buil an array with your requests, like this:
var f = [
{file: 'file_path', data: {action: 'action', data: 'any_data}},
{file: 'file_path', data: {action: 'action', data: 'any_data}},
{file: 'file_path', data: {action: 'action', data: 'any_data}},
{file: 'file_path', data: {action: 'action', data: 'any_data}}
];
3.Create callback function:
function Function_callback() {
alert('done');
}
4.Call the runFunctionQueue function with parameters:
runFunctionQueue(f, 0, QuestionInsert_callback);
// first parameter: array with requests data
// second parameter: start from first request
// third parameter: the callback function

$.when doesn't work for me, callback(x) instead of return x worked as described here: https://stackoverflow.com/a/13455253/10357604

The below solution worked for me using $when
$.when(master.GetStateByName(stateName)).done(function(response) {
if (response) {
}
});
GetStateByName: function(stateName) {
return $.ajax({
type: 'POST',
url: getStatesByName + '?stateName=' + stateName,
async: false,
});
}

This is working for me
It's very simple
return $.ajax({
type: 'POST',
url: urlBaseUrl
data: {someData:someData},
dataType: "json",
success: function(resultData) {
}
});

Try this way. make a loop inside java script function to wait until the ajax call finished.
function getLabelById(id)
{
var label = '';
var done = false;
$.ajax({
cache: false,
url: "YourMvcActionUrl",
type: "GET",
dataType: "json",
async: false,
error: function (result) {
label='undefined';
done = true;
},
success: function (result) {
label = result.Message;
done = true;
}
});
//A loop to check done if ajax call is done.
while (!done)
{
setTimeout(function(){ },500); // take a sleep.
}
return label;
}

Detect when all content from an AJAX call is loaded? (like DOM.ready) [duplicate]

How do I make a function wait until all jQuery Ajax requests are done inside another function?
In short, I need to wait for all Ajax requests to be done before I execute the next. But how?

jQuery now defines a when function for this purpose.
It accepts any number of Deferred objects as arguments, and executes a function when all of them resolve.
That means, if you want to initiate (for example) four ajax requests, then perform an action when they are done, you could do something like this:
$.when(ajax1(), ajax2(), ajax3(), ajax4()).done(function(a1, a2, a3, a4){
// the code here will be executed when all four ajax requests resolve.
// a1, a2, a3 and a4 are lists of length 3 containing the response text,
// status, and jqXHR object for each of the four ajax calls respectively.
});
function ajax1() {
// NOTE: This function must return the value
// from calling the $.ajax() method.
return $.ajax({
url: "someUrl",
dataType: "json",
data: yourJsonData,
...
});
}
In my opinion, it makes for a clean and clear syntax, and avoids involving any global variables such as ajaxStart and ajaxStop, which could have unwanted side effects as your page develops.
If you don't know in advance how many ajax arguments you need to wait for (i.e. you want to use a variable number of arguments), it can still be done but is just a little bit trickier. See Pass in an array of Deferreds to $.when() (and maybe jQuery .when troubleshooting with variable number of arguments).
If you need deeper control over the failure modes of the ajax scripts etc., you can save the object returned by .when() - it's a jQuery Promise object encompassing all of the original ajax queries. You can call .then() or .fail() on it to add detailed success/failure handlers.

If you want to know when all ajax requests are finished in your document, no matter how many of them exists, just use $.ajaxStop event this way:
$(document).ajaxStop(function () {
// 0 === $.active
});
In this case, neither you need to guess how many requests are happening in the application, that might finish in the future, nor dig into functions complex logic or find which functions are doing HTTP(S) requests.
$.ajaxStop here can also be bound to any HTML node that you
think might be modified by requst.
Update:
If you want to stick with ES syntax, then you can use Promise.all for known ajax methods:
Promise.all([ajax1(), ajax2()]).then(() => {
// all requests finished successfully
}).catch(() => {
// all requests finished but one or more failed
})
An interesting point here is that it works both with Promises and $.ajax requests.
Here is the jsFiddle demonstration.
Update 2:
Yet more recent version using async/await syntax:
try {
const results = await Promise.all([ajax1(), ajax2()])
// do other actions
} catch(ex) { }

I found a good answer by gnarf my self which is exactly what I was looking for :)
jQuery ajaxQueue
//This handles the queues
(function($) {
var ajaxQueue = $({});
$.ajaxQueue = function(ajaxOpts) {
var oldComplete = ajaxOpts.complete;
ajaxQueue.queue(function(next) {
ajaxOpts.complete = function() {
if (oldComplete) oldComplete.apply(this, arguments);
next();
};
$.ajax(ajaxOpts);
});
};
})(jQuery);
Then you can add a ajax request to the queue like this:
$.ajaxQueue({
url: 'page.php',
data: {id: 1},
type: 'POST',
success: function(data) {
$('#status').html(data);
}
});

Use the ajaxStop event.
For example, let's say you have a loading ... message while fetching 100 ajax requests and you want to hide that message once loaded.
From the jQuery doc:
$("#loading").ajaxStop(function() {
$(this).hide();
});
Do note that it will wait for all ajax requests being done on that page.

NOTE: The above answers use functionality that didn't exist at the time that this answer was written. I recommend using jQuery.when() instead of these approaches, but I'm leaving the answer for historical purposes.
-
You could probably get by with a simple counting semaphore, although how you implement it would be dependent on your code. A simple example would be something like...
var semaphore = 0, // counting semaphore for ajax requests
all_queued = false; // bool indicator to account for instances where the first request might finish before the second even starts
semaphore++;
$.get('ajax/test1.html', function(data) {
semaphore--;
if (all_queued && semaphore === 0) {
// process your custom stuff here
}
});
semaphore++;
$.get('ajax/test2.html', function(data) {
semaphore--;
if (all_queued && semaphore === 0) {
// process your custom stuff here
}
});
semaphore++;
$.get('ajax/test3.html', function(data) {
semaphore--;
if (all_queued && semaphore === 0) {
// process your custom stuff here
}
});
semaphore++;
$.get('ajax/test4.html', function(data) {
semaphore--;
if (all_queued && semaphore === 0) {
// process your custom stuff here
}
});
// now that all ajax requests are queued up, switch the bool to indicate it
all_queued = true;
If you wanted this to operate like {async: false} but you didn't want to lock the browser, you could accomplish the same thing with a jQuery queue.
var $queue = $("<div/>");
$queue.queue(function(){
$.get('ajax/test1.html', function(data) {
$queue.dequeue();
});
}).queue(function(){
$.get('ajax/test2.html', function(data) {
$queue.dequeue();
});
}).queue(function(){
$.get('ajax/test3.html', function(data) {
$queue.dequeue();
});
}).queue(function(){
$.get('ajax/test4.html', function(data) {
$queue.dequeue();
});
});

A little workaround is something like this:
// Define how many Ajax calls must be done
var ajaxCalls = 3;
var counter = 0;
var ajaxCallComplete = function() {
counter++;
if( counter >= ajaxCalls ) {
// When all ajax calls has been done
// Do something like hide waiting images, or any else function call
$('*').css('cursor', 'auto');
}
};
var loadPersons = function() {
// Show waiting image, or something else
$('*').css('cursor', 'wait');
var url = global.ctx + '/loadPersons';
$.getJSON(url, function(data) {
// Fun things
})
.complete(function() { **ajaxCallComplete();** });
};
var loadCountries = function() {
// Do things
var url = global.ctx + '/loadCountries';
$.getJSON(url, function(data) {
// Travels
})
.complete(function() { **ajaxCallComplete();** });
};
var loadCities = function() {
// Do things
var url = global.ctx + '/loadCities';
$.getJSON(url, function(data) {
// Travels
})
.complete(function() { **ajaxCallComplete();** });
};
$(document).ready(function(){
loadPersons();
loadCountries();
loadCities();
});
Hope can be useful...

javascript is event-based, so you should never wait, rather set hooks/callbacks
You can probably just use the success/complete methods of jquery.ajax
Or you could use .ajaxComplete :
$('.log').ajaxComplete(function(e, xhr, settings) {
if (settings.url == 'ajax/test.html') {
$(this).text('Triggered ajaxComplete handler.');
//and you can do whatever other processing here, including calling another function...
}
});
though youy should post a pseudocode of how your(s) ajax request(s) is(are) called to be more precise...

jQuery allows you to specify if you want the ajax request to be asynchronous or not. You can simply make the ajax requests synchronous and then the rest of the code won't execute until they return.
For example:
jQuery.ajax({
async: false,
//code
});

As other answers mentioned you can use ajaxStop() to wait until all ajax request are completed.
$(document).ajaxStop(function() {
// This function will be triggered every time any ajax request is requested and completed
});
If you want do it for an specific ajax() request the best you can do is use complete() method inside the certain ajax request:
$.ajax({
type: "POST",
url: "someUrl",
success: function(data) {
// This function will be triggered when ajax returns a 200 status code (success)
},
complete: function() {
// This function will be triggered always, when ajax request is completed, even it fails/returns other status code
},
error: function() {
// This will be triggered when ajax request fail.
}
});
But, If you need to wait only for a few and certain ajax request to be done? Use the wonderful javascript promises to wait until the these ajax you want to wait are done. I made a shortly, easy and readable example to show you how does promises works with ajax. Please take a look to the next example. I used setTimeout to clarify the example.
// Note:
// resolve() is used to mark the promise as resolved
// reject() is used to mark the promise as rejected
$(document).ready(function() {
$("button").on("click", function() {
var ajax1 = new Promise((resolve, reject) => {
$.ajax({
type: "GET",
url: "https://miro.medium.com/max/1200/0*UEtwA2ask7vQYW06.png",
xhrFields: { responseType: 'blob'},
success: function(data) {
setTimeout(function() {
$('#image1').attr("src", window.URL.createObjectURL(data));
resolve(" Promise ajax1 resolved");
}, 1000);
},
error: function() {
reject(" Promise ajax1 rejected");
},
});
});
var ajax2 = new Promise((resolve, reject) => {
$.ajax({
type: "GET",
url: "https://cdn1.iconfinder.com/data/icons/social-media-vol-1-1/24/_github-512.png",
xhrFields: { responseType: 'blob' },
success: function(data) {
setTimeout(function() {
$('#image2').attr("src", window.URL.createObjectURL(data));
resolve(" Promise ajax2 resolved");
}, 1500);
},
error: function() {
reject(" Promise ajax2 rejected");
},
});
});
var ajax3 = new Promise((resolve, reject) => {
$.ajax({
type: "GET",
url: "https://miro.medium.com/max/632/1*LUfpOf7teWvPdIPTBmYciA.png",
xhrFields: { responseType: 'blob' },
success: function(data) {
setTimeout(function() {
$('#image3').attr("src", window.URL.createObjectURL(data));
resolve(" Promise ajax3 resolved");
}, 2000);
},
error: function() {
reject(" Promise ajax3 rejected");
},
});
});
Promise.all([ajax1, ajax2, ajax3]).then(values => {
console.log("We waited until ajax ended: " + values);
console.log("My few ajax ended, lets do some things!!")
}, reason => {
console.log("Promises failed: " + reason);
});
// Or if you want wait for them individually do it like this
// ajax1.then(values => {
// console.log("Promise 1 resolved: " + values)
// }, reason => {
// console.log("Promise 1 failed: " + reason)
// });
});
});
img {
max-width: 200px;
max-height: 100px;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<button>Make AJAX request</button>
<div id="newContent">
<img id="image1" src="">
<img id="image2" src="">
<img id="image3" src="">
</div>

If you need something simple; once and done callback
//multiple ajax calls above
var callback = function () {
if ($.active !== 0) {
setTimeout(callback, '500');
return;
}
//whatever you need to do here
//...
};
callback();

Also you could use async.js.
I think its better than $.when because you can merge all kinds of asynchronous call that does not support promises out of the box like timeouts, SqlLite calls etc. and not just ajax requests.

On the basis of #BBonifield answer, I wrote a utility function so that semaphore logic is not spread in all the ajax calls.
untilAjax is the utility function which invokes a callback function when all the ajaxCalls are completed.
ajaxObjs is a array of ajax setting objects [http://api.jquery.com/jQuery.ajax/].
fn is callback function
function untilAjax(ajaxObjs, fn) {
if (!ajaxObjs || !fn) {
return;
}
var ajaxCount = ajaxObjs.length,
succ = null;
for (var i = 0; i < ajaxObjs.length; i++) { //append logic to invoke callback function once all the ajax calls are completed, in success handler.
succ = ajaxObjs[i]['success'];
ajaxObjs[i]['success'] = function(data) { //modified success handler
if (succ) {
succ(data);
}
ajaxCount--;
if (ajaxCount == 0) {
fn(); //modify statement suitably if you want 'this' keyword to refer to another object
}
};
$.ajax(ajaxObjs[i]); //make ajax call
succ = null;
};
Example: doSomething function uses untilAjax.
function doSomething() {
// variable declarations
untilAjax([{
url: 'url2',
dataType: 'json',
success: function(data) {
//do something with success data
}
}, {
url: 'url1',
dataType: 'json',
success: function(data) {
//do something with success data
}
}, {
url: 'url2',
dataType: 'json',
success: function(response) {
//do something with success data
}
}], function() {
// logic after all the calls are completed.
});
}

I highly recommend using $.when() if you're starting from scratch.
Even though this question has over million answers, I still didn't find anything useful for my case. Let's say you have to deal with an existing codebase, already making some ajax calls and don't want to introduce the complexity of promises and/or redo the whole thing.
We can easily take advantage of jQuery .data, .on and .trigger functions which have been a part of jQuery since forever.
Codepen
The good stuff about my solution is:
it's obvious what the callback exactly depends on
the function triggerNowOrOnLoaded doesn't care if the data has been already loaded or we're still waiting for it
it's super easy to plug it into an existing code
$(function() {
// wait for posts to be loaded
triggerNowOrOnLoaded("posts", function() {
var $body = $("body");
var posts = $body.data("posts");
$body.append("<div>Posts: " + posts.length + "</div>");
});
// some ajax requests
$.getJSON("https://jsonplaceholder.typicode.com/posts", function(data) {
$("body").data("posts", data).trigger("posts");
});
// doesn't matter if the `triggerNowOrOnLoaded` is called after or before the actual requests
$.getJSON("https://jsonplaceholder.typicode.com/users", function(data) {
$("body").data("users", data).trigger("users");
});
// wait for both types
triggerNowOrOnLoaded(["posts", "users"], function() {
var $body = $("body");
var posts = $body.data("posts");
var users = $body.data("users");
$body.append("<div>Posts: " + posts.length + " and Users: " + users.length + "</div>");
});
// works even if everything has already loaded!
setTimeout(function() {
// triggers immediately since users have been already loaded
triggerNowOrOnLoaded("users", function() {
var $body = $("body");
var users = $body.data("users");
$body.append("<div>Delayed Users: " + users.length + "</div>");
});
}, 2000); // 2 seconds
});
// helper function
function triggerNowOrOnLoaded(types, callback) {
types = $.isArray(types) ? types : [types];
var $body = $("body");
var waitForTypes = [];
$.each(types, function(i, type) {
if (typeof $body.data(type) === 'undefined') {
waitForTypes.push(type);
}
});
var isDataReady = waitForTypes.length === 0;
if (isDataReady) {
callback();
return;
}
// wait for the last type and run this function again for the rest of the types
var waitFor = waitForTypes.pop();
$body.on(waitFor, function() {
// remove event handler - we only want the stuff triggered once
$body.off(waitFor);
triggerNowOrOnLoaded(waitForTypes, callback);
});
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<body>Hi!</body>

I'm using size check when all ajax load completed
function get_ajax(link, data, callback) {
$.ajax({
url: link,
type: "GET",
data: data,
dataType: "json",
success: function (data, status, jqXHR) {
callback(jqXHR.status, data)
},
error: function (jqXHR, status, err) {
callback(jqXHR.status, jqXHR);
},
complete: function (jqXHR, status) {
}
})
}
function run_list_ajax(callback){
var size=0;
var max= 10;
for (let index = 0; index < max; index++) {
var link = 'http://api.jquery.com/ajaxStop/';
var data={i:index}
get_ajax(link,data,function(status, data){
console.log(index)
if(size>max-2){
callback('done')
}
size++
})
}
}
run_list_ajax(function(info){
console.log(info)
})
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.1/jquery.min.js"></script>

To expand upon Alex's answer, I have an example with variable arguments and promises. I wanted to load images via ajax and display them on the page after they all loaded.
To do that, I used the following:
let urlCreator = window.URL || window.webkitURL;
// Helper function for making ajax requests
let fetch = function(url) {
return $.ajax({
type: "get",
xhrFields: {
responseType: "blob"
},
url: url,
});
};
// Map the array of urls to an array of ajax requests
let urls = ["https://placekitten.com/200/250", "https://placekitten.com/300/250"];
let files = urls.map(url => fetch(url));
// Use the spread operator to wait for all requests
$.when(...files).then(function() {
// If we have multiple urls, then loop through
if(urls.length > 1) {
// Create image urls and tags for each result
Array.from(arguments).forEach(data => {
let imageUrl = urlCreator.createObjectURL(data[0]);
let img = `<img src=${imageUrl}>`;
$("#image_container").append(img);
});
}
else {
// Create image source and tag for result
let imageUrl = urlCreator.createObjectURL(arguments[0]);
let img = `<img src=${imageUrl}>`;
$("#image_container").append(img);
}
});
Updated to work for either single or multiple urls: https://jsfiddle.net/euypj5w9/

I found simple way, it using shift()
function waitReq(id)
{
jQuery.ajax(
{
type: 'POST',
url: ajaxurl,
data:
{
"page": id
},
success: function(resp)
{
...........
// check array length if not "0" continue to use next array value
if(ids.length)
{
waitReq(ids.shift()); // 2
)
},
error: function(resp)
{
....................
if(ids.length)
{
waitReq(ids.shift());
)
}
});
}
var ids = [1, 2, 3, 4, 5];
// shift() = delete first array value (then print)
waitReq(ids.shift()); // print 1

My solution is as follows
var request;
...
'services': {
'GetAddressBookData': function() {
//This is the primary service that loads all addressbook records
request = $.ajax({
type: "POST",
url: "Default.aspx/GetAddressBook",
contentType: "application/json;",
dataType: "json"
});
},
...
'apps': {
'AddressBook': {
'data': "",
'Start': function() {
...services.GetAddressBookData();
request.done(function(response) {
trace("ajax successful");
..apps.AddressBook.data = response['d'];
...apps.AddressBook.Filter();
});
request.fail(function(xhr, textStatus, errorThrown) {
trace("ajax failed - " + errorThrown);
});
Worked quite nicely. I've tried a lot of different ways of doing this, but I found this to be the simplest and most reusable. Hope it helps

Look at my solution:
1.Insert this function (and variable) into your javascript file:
var runFunctionQueue_callback;
function runFunctionQueue(f, index, callback) {
var next_index = index + 1
if (callback !== undefined) runFunctionQueue_callback = callback;
if (f[next_index] !== undefined) {
console.log(index + ' Next function avalaible -> ' + next_index);
$.ajax({
type: 'GET',
url: f[index].file,
data: (f[index].data),
complete: function() {
runFunctionQueue(f, next_index);
}
});
} else {
console.log(index + ' Last function');
$.ajax({
type: 'GET',
url: f[index].file,
data: (f[index].data),
async: false,
complete: runFunctionQueue_callback
});
}
}
2.Buil an array with your requests, like this:
var f = [
{file: 'file_path', data: {action: 'action', data: 'any_data}},
{file: 'file_path', data: {action: 'action', data: 'any_data}},
{file: 'file_path', data: {action: 'action', data: 'any_data}},
{file: 'file_path', data: {action: 'action', data: 'any_data}}
];
3.Create callback function:
function Function_callback() {
alert('done');
}
4.Call the runFunctionQueue function with parameters:
runFunctionQueue(f, 0, QuestionInsert_callback);
// first parameter: array with requests data
// second parameter: start from first request
// third parameter: the callback function

$.when doesn't work for me, callback(x) instead of return x worked as described here: https://stackoverflow.com/a/13455253/10357604

The below solution worked for me using $when
$.when(master.GetStateByName(stateName)).done(function(response) {
if (response) {
}
});
GetStateByName: function(stateName) {
return $.ajax({
type: 'POST',
url: getStatesByName + '?stateName=' + stateName,
async: false,
});
}

This is working for me
It's very simple
return $.ajax({
type: 'POST',
url: urlBaseUrl
data: {someData:someData},
dataType: "json",
success: function(resultData) {
}
});

Try this way. make a loop inside java script function to wait until the ajax call finished.
function getLabelById(id)
{
var label = '';
var done = false;
$.ajax({
cache: false,
url: "YourMvcActionUrl",
type: "GET",
dataType: "json",
async: false,
error: function (result) {
label='undefined';
done = true;
},
success: function (result) {
label = result.Message;
done = true;
}
});
//A loop to check done if ajax call is done.
while (!done)
{
setTimeout(function(){ },500); // take a sleep.
}
return label;
}

What's the best way to retry an AJAX request on failure using jQuery?

Pseudo code:
$(document).ajaxError(function(e, xhr, options, error) {
xhr.retry()
})
Even better would be some kind of exponential back-off

Something like this:
$.ajax({
url : 'someurl',
type : 'POST',
data : ....,
tryCount : 0,
retryLimit : 3,
success : function(json) {
//do something
},
error : function(xhr, textStatus, errorThrown ) {
if (textStatus == 'timeout') {
this.tryCount++;
if (this.tryCount <= this.retryLimit) {
//try again
$.ajax(this);
return;
}
return;
}
if (xhr.status == 500) {
//handle error
} else {
//handle error
}
}
});

One approach is to use a wrapper function:
(function runAjax(retries, delay){
delay = delay || 1000;
$.ajax({
type : 'GET',
url : '',
dataType : 'json',
contentType : 'application/json'
})
.fail(function(){
console.log(retries); // prrint retry count
retries > 0 && setTimeout(function(){
runAjax(--retries);
},delay);
})
})(3, 100);
Another approach would be to use a retries property on the $.ajax
// define ajax settings
var ajaxSettings = {
type : 'GET',
url : '',
dataType : 'json',
contentType : 'application/json',
retries : 3 // <-----------------------
};
// run initial ajax
$.ajax(ajaxSettings).fail(onFail)
// on fail, retry by creating a new Ajax deferred
function onFail(){
if( ajaxSettings.retries-- > 0 )
setTimeout(function(){
$.ajax(ajaxSettings).fail(onFail);
}, 1000);
}
Another way (GIST) - override original $.ajax (better for DRY)
// enhance the original "$.ajax" with a retry mechanism
$.ajax = (($oldAjax) => {
// on fail, retry by creating a new Ajax deferred
function check(a,b,c){
var shouldRetry = b != 'success' && b != 'parsererror';
if( shouldRetry && --this.retries > 0 )
setTimeout(() => { $.ajax(this) }, this.retryInterval || 100);
}
return settings => $oldAjax(settings).always(check)
})($.ajax);
// now we can use the "retries" property if we need to retry on fail
$.ajax({
type : 'GET',
url : 'http://www.whatever123.gov',
timeout : 2000,
retries : 3, // <-------- Optional
retryInterval : 2000 // <-------- Optional
})
// Problem: "fail" will only be called once, and not for each retry
.fail(()=>{
console.log('failed')
});
A point to consider is making sure the $.ajax method wasn't already wrapped previously, in order to avoid the same code running twice.
You can copy-paste these snippets (as-is) to the console to test them

I've had a lot of success with this code below (example: http://jsfiddle.net/uZSFK/)
$.ajaxSetup({
timeout: 3000,
retryAfter:7000
});
function func( param ){
$.ajax( 'http://www.example.com/' )
.success( function() {
console.log( 'Ajax request worked' );
})
.error(function() {
console.log( 'Ajax request failed...' );
setTimeout ( function(){ func( param ) }, $.ajaxSetup().retryAfter );
});
}

Your code is almost full :)
const counter = 0;
$(document).ajaxSuccess(function ( event, xhr, settings ) {
counter = 0;
}).ajaxError(function ( event, jqxhr, settings, thrownError ) {
if (counter === 0 /*any thing else you want to check ie && jqxhr.status === 401*/) {
++counter;
$.ajax(settings);
}
});

None of these answers work if somebody calls .done() after their ajax call because you won't have the success method to attach to the future call back. So if somebody does this:
$.ajax({...someoptions...}).done(mySuccessFunc);
Then mySuccessFunc won't get called on the retry. Here's my solution, which is heavily borrowed from #cjpak's answer here. In my case I want to retry when AWS's API Gateway responds with 502 error.
const RETRY_WAIT = [10 * 1000, 5 * 1000, 2 * 1000];
// This is what tells JQuery to retry $.ajax requests
// Ideas for this borrowed from https://stackoverflow.com/a/12446363/491553
$.ajaxPrefilter(function(opts, originalOpts, jqXHR) {
if(opts.retryCount === undefined) {
opts.retryCount = 3;
}
// Our own deferred object to handle done/fail callbacks
let dfd = $.Deferred();
// If the request works, return normally
jqXHR.done(dfd.resolve);
// If the request fails, retry a few times, yet still resolve
jqXHR.fail((xhr, textStatus, errorThrown) => {
console.log("Caught error: " + JSON.stringify(xhr) + ", textStatus: " + textStatus + ", errorThrown: " + errorThrown);
if (xhr && xhr.readyState === 0 && xhr.status === 0 && xhr.statusText === "error") {
// API Gateway gave up. Let's retry.
if (opts.retryCount-- > 0) {
let retryWait = RETRY_WAIT[opts.retryCount];
console.log("Retrying after waiting " + retryWait + " ms...");
setTimeout(() => {
// Retry with a copied originalOpts with retryCount.
let newOpts = $.extend({}, originalOpts, {
retryCount: opts.retryCount
});
$.ajax(newOpts).done(dfd.resolve);
}, retryWait);
} else {
alert("Cannot reach the server. Please check your internet connection and then try again.");
}
} else {
defaultFailFunction(xhr, textStatus, errorThrown); // or you could call dfd.reject if your users call $.ajax().fail()
}
});
// NOW override the jqXHR's promise functions with our deferred
return dfd.promise(jqXHR);
});
This snippet will back-off and retry after 2 seconds, then 5 seconds, then 10 seconds, which you can edit by modifying the RETRY_WAIT constant.
AWS support suggested we add a retry, since it happens for us only once in a blue moon.

Here is a small plugin for this:
https://github.com/execjosh/jquery-ajax-retry
Auto incrementing timeout would be a good addition to it.
To use it globally just create your own function with $.ajax signature, use there retry api and replace all your $.ajax calls by your new function.
Also you could directly replace $.ajax, but you will not be able to make xhr calls without retry then.

Here's the method that worked for me for asynchronous loading of libraries:
var jqOnError = function(xhr, textStatus, errorThrown ) {
if (typeof this.tryCount !== "number") {
this.tryCount = 1;
}
if (textStatus === 'timeout') {
if (this.tryCount < 3) { /* hardcoded number */
this.tryCount++;
//try again
$.ajax(this);
return;
}
return;
}
if (xhr.status === 500) {
//handle error
} else {
//handle error
}
};
jQuery.loadScript = function (name, url, callback) {
if(jQuery[name]){
callback;
} else {
jQuery.ajax({
name: name,
url: url,
dataType: 'script',
success: callback,
async: true,
timeout: 5000, /* hardcoded number (5 sec) */
error : jqOnError
});
}
}
Then just call .load_script from your app and nest your success callback:
$.loadScript('maps', '//maps.google.com/maps/api/js?v=3.23&libraries=geometry&libraries=places&language=&hl=&region=', function(){
initialize_map();
loadListeners();
});

DemoUsers's answer doesn't work with Zepto, since this in the error function is pointing to Window. (And that way of using 'this' is not secure enough as you don't know how they implement ajax or no need to.)
For Zepto, maybe you could try below, till now it works well for me:
var AjaxRetry = function(retryLimit) {
this.retryLimit = typeof retryLimit === 'number' ? retryLimit : 0;
this.tryCount = 0;
this.params = null;
};
AjaxRetry.prototype.request = function(params, errorCallback) {
this.tryCount = 0;
var self = this;
params.error = function(xhr, textStatus, error) {
if (textStatus === 'timeout') {
self.tryCount ++;
if (self.tryCount <= self.retryLimit) {
$.ajax(self.params)
return;
}
}
errorCallback && errorCallback(xhr, textStatus, error);
};
this.params = params;
$.ajax(this.params);
};
//send an ajax request
new AjaxRetry(2).request(params, function(){});
Use constructor to make sure request is reentrant!

I resolved my specific issue with #vsync 3rd code.
$.ajax = (($oldAjax) => {
var df = $.Deferred();
// on fail, retry by creating a new Ajax deferred
function check(self, status) {
console.log("check " + status + " => " + self.retries);
const shouldRetry = status != 'success' && status != 'parsererror';
if (shouldRetry && self.retries > 0) {
setTimeout(() => {
console.log("retry " + self.retries);
$.ajax(self);
}, self.retryInterval || 100);
}
}
function failed(jqXHR, status, e) {
if (this.retries - 1 <= 0) {
// 재시도 횟수가 끝나면, 오류 보내기
df.reject(KfError.convertKfError(jqXHR, this.url));
} else {
this.retries --;
check(this, 'retry', this.retries);
}
}
function done(res, textStatus, jqXHR) {
if (!res.success) { // 200 코드이지만, 응답에 실패라면 오류로 처리
if (this.retries - 1 <= 0) {
df.reject(KfError.createResponseError(res, this.url));
} else {
this.retries --;
check(this, 'retry', this.retries)
}
} else {
df.resolve(res, textStatus, jqXHR);
}
}
return function (settings) {
$oldAjax(settings)
.fail(failed)
.done(done);
return df;
};
})($.ajax);
function createRequest(url) {
return $.ajax({
type: 'GET',
url: url,
timeout: 2000,
retries: 3,
retryInterval: 1000
});
}
$(function () {
createRequest(Rest.correctUrl('/auth/refres'))
.then((res) => {
console.log('ok res');
})
.catch((e) => {
// Finally catch error after retrial.
console.log(e);
});
});

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Configure jQuery to retry ajax calls if they fail - javascript

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