Develop Reference

how to implement asynchronous get in ajax

what should I write in the script to make javascript asynchronously implement firstly ajax method GET and then another simple function(in the order of my script)?
because here while debugging I see that getCategories() is implemented before WriteCategories(categories)
$.ajax({
url: '/api/ListingAPI/GetCategoriesById?id=1',
type: 'GET',
dataType: 'json',
success: function WriteCategories(categories) {
// ...
}
});
var test = getCategories();

Actually you want synchronous execution,
you need to add async: false in ajax request, (But be aware of this it will freeze your UI until your request completes, actually it is not recommended)
$.ajax({
url: '/api/ListingAPI/GetCategoriesById?id=1',
type: 'GET',
async: false,
dataType: 'json',
success: function WriteCategories(categories) {
// ...
}
});
var test = getCategories();
or either you can call your function on ajax success callback,
$.ajax({
url: '/api/ListingAPI/GetCategoriesById?id=1',
type: 'GET',
dataType: 'json',
success: function WriteCategories(categories) {
var test = getCategories();
}
});
For your knowledge, You can pass your query string params in data option in ajax rather than query string itself,
var queryStringData = {id : 1}
$.ajax({
url: '/api/ListingAPI/GetCategoriesById',
type: 'GET',
dataType: 'json',
data: queryStringData,
success: function WriteCategories(categories) {
var test = getCategories();
}
});

Try this code.
$.ajax({
url: '/api/ListingAPI/GetCategoriesById?id=1',
type: 'GET',
dataType: 'json',
success: function WriteCategories(categories) {
var test = getCategories();
}
});
You can call this function after ajax success. By this way AJAX get will be executed first.

Javascript get JSON value from URL error

im using the function below to get image names. I also use the json code to get data of a different url, but somehow it isnt working at this. (im new to javascript. Just writing php normally.
function getImgname(name) {
$.getJSON("http://url.com/info.php?name="+name, function(json321) {
return json321.js_skininfo;
});
}

Try this:
function getImgname(myName) {
$.ajax({
url: 'http://url.com/info.php',
data: {
name: myName
},
type: 'POST',
dataType: 'json',
success: function(data) {
// do what you want with your data
return data.js_skininfo;
}
});
}

I tried this now:
function getImgname(myName) {
$.ajax({
url: "http://url.com/ninfo.php",
type: 'POST',
dataType: 'json',
success: function (data) {
return data.js_skininfo;
},
error: function () {
}
});
}
This isnt working (undefinied), but if i alert the data.js_skininfo it shows me the correct value.

Calling controller method from Javascript function

i want to call a controller method from a javascript method. I have the following code:
function test() {
$.ajax({
url: #Url.Action("abc"),
method: 'GET',
success: function(data) { alert(data); }
});
}
[HttpGet]
public string abc(string id)
{
return "Info";
}
How is it possible to get the "info" string back, in my alert() in the Javascript controller?

You need to add dataType attribute in ajax call.
Try this one:
function test() {
$.ajax({
url: #Url.Action("abc"),
method: 'GET',
dataType: "text",
success: function(data) { alert(data); }
});
}

how to pass a additional data with form serialized data on ajax?

How to pass an additional data with form serialize data on ajax post method?.
below is my code which was using for ajax post,
$(document).ready(function()
{
var additional_data=$("#extra_data").val();
$.ajax({
type: 'POST',
url: 'send_mail.php',
data: frm.serialize(),
success: function (data) {
alert(data);
}
});
});
here, how to pass a additional_data with serialize form data

From jQuery API DOCS
The .serializeArray() method creates a JavaScript array of objects
The .serialize() method creates a text string in standard URL-encoded notation.
I think to use push , we need to use serializeArray
try to use
var frmData = frm.serializeArray();
frmData.push({name: "name", value: "test"});
$(document).ready(function()
{
var additional_data=$("#extra_data").val();
$.ajax({
type: 'POST',
url: 'send_mail.php',
data: frmData,
success: function (data) {
alert(data);
}
});
});

You need to push the elements to the existing serialized data.
var frmData = frm.serialize();
frmData.push({name: nameofthevariable, value: valueofthevariable});
frmData.push({name: nameofthevariable2, value: valueofthevariable2});
frmData.push({name: nameofthevariable3, value: valueofthevariable3});
$(document).ready(function()
{
var additional_data=$("#extra_data").val();
$.ajax({
type: 'POST',
url: 'send_mail.php',
data: frmData,
success: function (data) {
alert(data);
}
});
});

serialize() create a query string of the form. So you can append additional parameters into it.
$(document).ready(function()
{
var additional_data=$("#extra_data").val();
$.ajax({
type: 'POST',
url: 'send_mail.php',
data: frm.serialize()+'&param1='+value1+'&param2='+value2,
success: function (data) {
alert(data);
}
});
});

serializearray() can be used to send additional parameters. PFB code for sending additional parameters.
var request = $('form').serializeArray();
request.push({name: "kindOf", value: "save"});
Ajax call
$.ajax({
url: "/ST/SubmitRequest",
dataType: "json",
//contentType: "application/json",
type: "POST",
data: request,
//data: r1,
success: function (response) {
//Setinterval();
//alert("Done...!");
},
failure: function (response) {
alert(response.responseText);
},
error: function (response) {
alert(response.responseText);
}
});

Going reusable with data attributes and jquery

I have many Bootstrap Type-ahead attached to my text-box.
I was using there id to select then and attach typeahead.
Sample
$("#SireTag").typeahead({
source: function (query, process) {
$.ajax({
url: '/Bull/GetSireTag',
type: 'POST',
data: 'query=' + query,
dataType: 'JSON',
async: true,
success: function (data) {
console.log(data);
process(data);
}
});
}
});
Now i decided to make it more readable and short by using a single java-script code to attach type ahead to all my text-boxes.
<input data-typeahead-url="/Bull/GetSireTag" id="SireTag" name="SireTag" type="text" value="">
New Javascript
$('*[data-typeahead-url]')
.each(function () {
alert(this);
$(this).typeahead({
source: function (query, process) {
$.ajax({
url: $(this).data("typeahead-url"),
type: 'POST',
data: 'query=' + query,
dataType: 'JSON',
async: true,
success: function (data) {
console.log(data);
process(data);
}
})
}
});
});
But its not working i am not so proficient with java-script anyone now whats wrong.
I tried developers tool ajax request is not made.

$('*[data-autocomplete-url]') doesn't select your elements because you're using data-typeahead-url.

You need to return the ajax result to the source, also don't use alert() to debug, use console.log() instead:
$('input[data-typeahead-url]').each(function () {
$(this).typeahead({
source: function (query, process) {
return $.ajax({
url: $(this).data("typeahead-url"),
type: 'POST',
data: { query: query },
dataType: 'json',
async: true,
success: function (resp) {
console.log(resp);
return process(resp);
}
});
}
});
});
Hope it helps.

$('*[data-typeahead-url]')
.each(function () {
var url = $(this).data("typeahead-url");
$(this).typeahead({
source: function (query, process) {
$.ajax({
url: url,
type: 'POST',
data: 'query=' + query,
dataType: 'JSON',
async: true,
success: function (data) {
console.log(data);
process(data);
}
})
}
});
});
Problem: The code was making ajax request but to the same address.
Diagnose: I tried log($(this).data("typeahead-url");) which gave desired output.
Solution: I created and stored the Url the used it as a parameter in ajax call
var url = $(this).data("typeahead-url");
Hope this help.