This question already has answers here:
How can I get jQuery to perform a synchronous, rather than asynchronous, Ajax request?
(14 answers)
Closed 6 years ago.
I want to send to server (php) a request AJAX from an api javascript:
JS File :
var commit = new Object();
commit.id= this.id;
commit.action = this.doCommit;
commit.vrp= this.vrp;
$.post(this.ajaxURL, commit);
with this code i can send a request but in mode asynchroun. I searched on internet and I found a solution :
$.ajax({
type: 'POST',
url: this.ajaxURL,
data: commit,
async:false
});
I don't know if it is the best solution, or I can precise async:false in a $.post request, if yes , how ?.
So you do or you do not want to send the request asynchronously? The question seems to be confusing for me. But by default, $.ajax({... is always async, and $.post is just a shorthand way to write a simple post ajax request, which is also async. If you use the async:false, you are telling the javascript to not continue to execute the next line of code until the request finishes.
Related
This question already has answers here:
How do I return the response from an asynchronous call?
(41 answers)
Closed 6 years ago.
I have script following:
var price_option_oc = 0;
// Example
jQuery.ajax({
type: "POST",
processData: false,
dataType: "text",
url: mainURL + url_ajax_get_prices_oc,
data: JSON.stringify(datas),
contentType: "application/json; charset=utf-8",
}).done(function(data) {
console.log('{1}=' + data);
price_option_oc = data;
});
console.log('{2}' + price_option_oc);
Why result is, I dont know why, please explain for me
{2}0
{2}0
{1}=9
{1}=9
Why not is:
{1}=9
{1}=9
{2}0
{2}0
Thanks.
Ajax requests run asynchronously to the rest of your code. That is, they run in parallel.
So it's very likely that
console.log('{2}'+price_option_oc);
is running before the ajax call completes and runs console.log('{1}='+data);
I say "very likely" because, since the ajax call relies on external factors like network speed and the response speed of the remote server, you can't guarantee how fast it will run, and therefore you can't guarantee the order things will run in.
If you need to run code which depends on the response from an ajax call, then you must put that code into your .done function (or into a function which is called from there).
P.S. I would not use async:false to solve this type of issue - this will cause the browser to stop responding to any user input until the ajax call completes (or fails). If the call takes longer than normal, it will look to the user like their browser has crashed. This is not user-friendly. Most coders don't use this feature for that reason.
This question already has answers here:
JQuery ajax call default timeout value
(5 answers)
Closed 7 years ago.
I am using jQuery's getScript() method to load some third part js library, I am wondering whether there's a default time out value for this method. I don't really believe getScript will keep waiting until it gets a response, but I need to know how long before it quit and if that value is not ideal to me, is there a way to configure it? Maybe something like this?
$.ajaxSetup({
cache: true
});
According to jQuery documentation
This is a shorthand Ajax function, which is equivalent to:
$.ajax({
url: url,
dataType: "script",
success: success
});
So it uses the default timeout which you can override as usually you do for jQuery.ajax.
This question already has answers here:
Abort Ajax requests using jQuery
(18 answers)
Closed 8 years ago.
I would like to stop an ajax call in jquery, which is not working
var xhr = null;
xhr = $.ajax({
url : 'www.example.com?some-large-call',
success : function(responseText) {
// some DOM manipulation
}
});
$("#button").click(function() { xhr.abort() });
I referred the below link
http://www.stoimen.com/blog/2009/09/29/jquery-stop-an-ajax-call/
this probally has more XHR..
Please see this answer:
jquery abort() ajax request before sending another
From the link:
every time you do ajax request, add to array:
requests.push(
$.ajax({
type: 'post',
url: '/test.php',
data: search_data,
success: function(data) {
$('#catalog').html(data);
}
}));
Then, when you want to stop calls..
loop through array and abort all calls..
for(var i = 0; i < requests.length; i++)
requests[i].abort();
Thanks
xhr.abort() it will cause the client to stop listening for the event, but probably it may not stop the server from processing it.
Provided the code you've pasted is the code you're actually using it's no wonder it doesn't work.
As it states on the site it is just pseudo code to illustrate an example. There is no AJAX request there and nothing to stop (at least nothing large enough to be able to stop)
This question already has answers here:
How do I return the response from an asynchronous call?
(41 answers)
Closed 9 years ago.
In my javascript file, I use the function above to get asynchronously a value calculated by the server:
function function2(userid)
{
$.ajax({
type: "POST",
url: "http://localhost/bghitn/web/app_dev.php/get_number_of_articles",
data:{id:userid},
cache: false,
success: function(data){
return data;
}
});
}
In fact, I call the function2 inside a set of functions:
function1();
var userid=.....
var x= function2(userid);
function3(x);
The problem:
as you see, function3 uses the data returned by function2. But it seems that function3 starts executing before the AJAX call is successfully finished. I tried to use the when function but in vain.
$.when(function2(userid)).done(function(){
function3();
});
How to make the next javascript code executes after the preceding AJAX request is successfully performed? Your advices are highly appreciates.
Option 1: You can always set your AJAX call to be synchronius, but be ready that the whole page stucks while waiting for response. just add parameter async: false to your set of parameters.
Option 2: Provide callbacks or put your future code inside success handler
Option 3: You can use defer/promise described here http://blog.mediumequalsmessage.com/promise-deferred-objects-in-javascript-pt1-theory-and-semantics
This question already has answers here:
How can I get jQuery to perform a synchronous, rather than asynchronous, Ajax request?
(14 answers)
Closed 9 years ago.
I’ve been googling this and avoiding this error in my bug fix list for a long time now, but I’ve finally reached the end of the list, the last of which I have to make a function return true/false to state whether the validation has succeeded or not.
I'm using ajax to compare certain fields with those that are already in the db and by default the $.post() method does it's operations asynchronously.
I’m setting a variable inside the call onSuccess and the calling method doesn't get a response because of this, so all my js/jquery fails on pageLoad... I would prefer if I could still keep using the $.post method.
jQuery < 1.8
May I suggest that you use $.ajax() instead of $.post() as it's much more customizable.
If you are calling $.post(), e.g., like this:
$.post( url, data, success, dataType );
You could turn it into its $.ajax() equivalent:
$.ajax({
type: 'POST',
url: url,
data: data,
success: success,
dataType: dataType,
async:false
});
Please note the async:false at the end of the $.ajax() parameter object.
Here you have a full detail of the $.ajax() parameters: jQuery.ajax() – jQuery API Documentation.
jQuery >=1.8 "async:false" deprecation notice
jQuery >=1.8 won't block the UI during the http request, so we have to use a workaround to stop user interaction as long as the request is processed. For example:
use a plugin e.g. BlockUI;
manually add an overlay before calling $.ajax(), and then remove it when the AJAX .done() callback is called.
Please have a look at this answer for an example.
If you want an synchronous request set the async property to false for the request. Check out the jQuery AJAX Doc
From the Jquery docs: you specify the async option to be false to get a synchronous Ajax request. Then your callback can set some data before your mother function proceeds.
Here's what your code would look like if changed as suggested:
beforecreate: function(node,targetNode,type,to) {
jQuery.ajax({
url: url,
success: function(result) {
if(result.isOk == false)
alert(result.message);
},
async: false
});
}
this is because $.ajax is the only request type that you can set the asynchronousity for