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A part of AJAX response storing in PHP variable

I need to store a piece of data, into PHP variable, which is received through AJAX response in an input box. How can I do this?
<script type="text/javascript">
$(document).ready(function() {
$("#user_id").change(function() {
var id = $(this).val();
var dataString = 'user_id='+ id;
$.ajax({
type: "POST",
url: "wmat_details.php",
data: dataString,
cache: false,
success: function(result) {
var data = result.split(",");
$('#name').val(data[0]);
$('#email').val(data[1]);
$('#ref_id').val(data[2]);
$('#candidature_start').val(data[3]);
$('#candidature_end').val(data[4]);
$('#default_attempts').val(data[5]);
$('#existing_complimentary').val(data[6]);
$('#wmat_start').val(data[9]);
$('#wmat_end').val(data[10]);
$('#attempts_taken').val(data[11]);
}
});
});
});
</script>
As shown in above code, I want to store $('#attempts_taken').val(data[11]); this value to a PHP variable. Any insight is appreciated.

Unfortunately you can't.
PHP is server side while jQuery (JS) is client side. They are two separate layers of abstraction that interact only when the client call the server.
I don't have enough informations about what you need to do with data[11] but it seems that you have only one option: make a consecutive AJAX call to the php file that will manipulate data[11].
The consecutive AJAX call must be executed from inside the first call success callback; something like this:
success: function(result){
// Your on success logic
// ...
// Prepare the object to send to the server
var objData = {};
objData.attemptsTaken = data[11];
// Execute the second AJAX call to the server
$.ajax({
type: "POST",
url: "second_call_destination_file.php",
data: objData,
success: function(result){
// Do something on success
},
error: function(){
// Do something on error
},
complete: function(){
// Do something on complete (executed after success and error)
}
}

You cannot store ajax response into a php variable.
way 1 :
You can make another ajax call.
way 2 :
you can set session.

Passing php string as json to be received by jquery

I am trying to echo a string which is structured like json, but the jquery ajax post is not able to parse it properly. What I want to know is if this string will be treated like json in the jquery json parse just like when we echo a json_encode.
echo '{"mobno":'.$mobno.',"charge":'.$charge.',"capacity":'.$capacity.'}';
ajax code:
jQuery.ajax({
type: "POST",
url: "file.php",
data: { type: $(this).val(), amount: $("#amount").val()},
cache: false,
success: function(response){
var Vals = JSON.parse(response);
if(!Vals){
alert("Error1");
}else{
var capacity = parseInt(Vals.capacity);
if(capacity>0){
alert("worked1");
}else{
alert("worked2");
}
}
}
});
I don't get a single alert out of the 3.

As per your edit and comment, your json string is correct. You just have to change your AJAX request.
Add this setting dataType: "json" in your AJAX request if you're expecting a json object as response from server.
So your AJAX request should be like this:
jQuery.ajax({
type: "POST",
url: "file.php",
data: { type: $(this).val(), amount: $("#amount").val()},
cache: false,
dataType: "json",
success: function(response){
// you can access json properties like this:
// response.mobno
// response.charge
// response.capacity
var capacity = response.capacity;
if(capacity > 0){
alert("worked1");
}else{
alert("worked2");
}
}
});

Just so JavaScript can differ string and properties of json, please use double quote for starting and ending the string and for json properties use single quote or vice-versa. Try that out and let me know if you could not figure that out.

As other answers suggest you need to fix the quotes of the JSON the web service is sending back in the response.
Regarding you question, everything sent back in the response is actually a string. You need to decide what to do with it once it arrives.
One of the ways to allow both client side and server side programs understand what was sent is setting the right content type header.
For JSON the best way is to set the content type header to "application/json".
If you're using php you can do this:
$data = /** whatever you're serializing **/;
header('Content-Type: application/json');
echo json_encode($data);
On the client side jquery ajax you can do this:
$.ajax({
dataType: "json",
url: url,
data: data,
success: function(data, textStatus, jqXHR){}
});
In this example the "data" parameter passed to the "success" callback function is already a js object (after JSON.parse). This is due to the use of the "dataType" parameter in the ajax declaration.
Optionally, you can do this manually and write a simple $.post which receives a string and do the JSON.parse yourself.
Maybe you should do the manual parsing yourself at first, and use the console.log(data) before and after the parsing so you'd know you're doing it correctly. Then, move on to the automatic way with "dataType" set to "json".

Please see #Rajdeep Paul's JSON string correction. Then, have your response JSON object remapped to an array.
JSON string
echo "{\"mobno\":\"".$mobno."\",\"charge\":\"".$charge."\",\"capacity\":\"".$capacity."\"}";
Ajax
$.ajax({
type: "POST",
url: "file.php",
data: { type: $(this).val(), amount: $("#amount").val()},
cache: false,
success: function(response){
// map JSON object to one-dimensional array
var Vals = $.map( JSON.parse(response), function(el) { return el });
if(!Vals){
alert("Error1");
}else{
var count = parseInt(Vals.length);
if(count>0){
alert("worked1");
}else{
alert("worked2");
}
}
}
});
Reference: Converting JSON Object into Javascript array

How to pass json data from one javascript to another

Guys here the first script is designed to take static .json files to display certain content and animate them. The code snippet is
var self = this;
$.getJSON('data/post_'+ index +'.json', function(d){
self.postCache[index] = d;
callback(d)
but I want to modify it to so it could take data from database. I got the data in the same format as it was in static json files and my question is how can I pass that data to this script so that it work as it should.
I am sending request using ajax
$(function ()
{
$.ajax({
url: 'api.php',
data: "<?php echo $data?>",
dataType: 'json',
success: function(data)
{
//I really dont know what to write here :(
}
});
});
and the api.php file is getting data from database and I an encoding the data to json using json_encode

var self = this;
$.post('api.php',
{"post_id": index},
success: function(d)
{
self.postCache[index] = d;
callback(d);
});
see http://api.jquery.com/jquery.post/
In api.php do a SQL query where the post_id = $_POST['post_id'] then echo json_encode($database_row);

$.getJSON just calls $.ajax with some predefined values automatically set for you. This means, since you said the data is the same, that you can do exactly the same as you were doing previously.
Keep a reference to this
Make your async call
in the success function, save your reference and execute your callback
var self = this;
$.ajax({
url: 'api.php',
data: "<?php echo $data?>",
dataType: 'json',
success: function(data)
{
self.postCache[index] = data;
callback(data);
}
});

Issue in getting a property in a JSON file using jQuery GET

I ma using jQuery get to retrieve a simple property on a JSON file.
With the following script I get undefined.
What am I doing wrong here?
<script>
$(document).ready(function() {
var urlOriginal = 'http://xxx.com/xxx/xxx/xxx/resources.js';
var urlResource = 'proxy_dr3.php?proxy_url=' + encodeURIComponent(urlOriginal);
$.get(urlResource, function(data) {
console.log(data); // I can see all the content from the JSON FILE
console.log(data.urlPage); // undefined - PROBLEM HERE
var urlHTML = data.urlPage;
/*$.get(urlHTML, function(data) {
$('#result').html(data);
});*/
});
});
</script>
content for resource.js is json
{
"urlPage": "http://xxx.com/xxx/xxx/xxx/article_517d960f0cf2fe38916a2f9d.html"
}
The result type in Network is text/html. After loading resource.js

$.get won't guess it's JSON as the mime type your server gives is wrong.
You could parse the provided value (which is probably a string) using JSON.parse but you should use $.getJSON, so that the callback receives a parsed value.
$.getJSON(urlResource, function(data) {
console.log(data);
console.log(data.urlPage);
});

you can use any one method which is best suitable for your app.
$.ajax({
type: "GET",
data: "ur data",
url: "ur url",
contentType: "application/json; charset=utf-8",
success: function(data) {
}
});
or you can use $.getJSON function

Send JavaScript object to web server call via jQuery - what is the correct way?

I'm trying to send JSON data to my web server via jQuery and I'm running into an error.
Uncaught TypeError: Cannot use 'in' operator to search for 'context' in {"id":45,"isRead":true}
code I am testing:
var obj = {};
obj.id = 45;
obj.isRead = true;
var data = JSON.stringify(obj);
var url = "/notification/read"
$.ajax(url, data, 'application/json', function() {
// code remove notification from the DOM
});
});
Is there a better or more correct way to do this? Not sure if I'm getting the params right on the $.ajax call either.
UPDATE
code I got to work
var obj = {
id: 45,
isRead: true
};
var json = JSON.stringify(obj);
var url = "/notification/read"
$.ajax({ url: url,
type:'POST',
contentType: 'application/json',
data: json,
success: function(data, textStatus) {
// do stuff
}
});
My server was expecting JSON data POSTed as application/json. So was I wrong in thinking I needed all these variables? without these it was sent as a GET and was application/x-www-form-urlencoded. Without the stringify it also didn't work.

You are passing too many arguments to the ajax function: http://api.jquery.com/jQuery.ajax/
Also, the JSON.stringify call is not necessary, jQuery will take care of that for you.
var obj = {
'id':45,
'isRead':true
};
$.ajax({
url: "/notification/read",
data: obj,
success: function(data, textStatus){
/* code here */
}
});

$.ajax(url, obj);
You need to send an object as second param
{success: success, data: data}

Documentation is here:
http://api.jquery.com/jQuery.ajax/
You have to pass parameters as one object, not multiple ones