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Ajax jquery to stop running when windows is closed

All,
I am new to MVC. I have built an application where a button click performs
get market data (lengthy operation).
data message and upload to database.
This is what the JavaScript function looks like:
function OnClick(s, e) {
if (true) {
$.ajax({
type: "POST",
url: "#Url.Action("DataFileUpload", "ImportData")",
data: JSON.stringify({ positionDate: positionDate }),
dataType: "text",
contentType: "application/json; charset=utf-8",
beforeSend: function () { lpImport.Show(); },
success: function (msg) {
ImportDataGridView.PerformCallback();
ImportSuccessMessage.SetVisible(true);
ImportSuccessMessage.SetText(msg);
lpImport.Hide();
},
error: function (xhr) {
alert(xhr)
ImportDataGridView.PerformCallback();
}
});
}
}
What is happening right now is - When users close the browser in the middle of the run, controller action is still running. I can see that in my log.
How do I make browser close to stop running my controller action DataFileUpload ?
Thanks for helping out.

you can use the abort function from the XMLHttpRequest that $.ajax() returns.
abort(). If the request has been sent already, this method will abort the request.
Something like:
var xhr;
function OnClick(s, e) {
if (true) {
xhr = $.ajax({
type: "POST",
url: "#Url.Action("DataFileUpload", "ImportData")",
data: JSON.stringify({ positionDate: positionDate }),
dataType: "text",
contentType: "application/json; charset=utf-8",
beforeSend: function () { lpImport.Show(); },
success: function (msg) {
ImportDataGridView.PerformCallback();
ImportSuccessMessage.SetVisible(true);
ImportSuccessMessage.SetText(msg);
lpImport.Hide();
},
error: function (xhr) {
alert(xhr)
ImportDataGridView.PerformCallback();
}
});
}
}
function closeBrowser() {
xhr.abort();
}
but this will only cancel the event on the client. You should also cancel the request on the serverside.

Ajax error value return null

I have a function in ajax :
$.ajax({
type: "POST",
url: "#Url.Action("FiltraLevatamento", "Consulta")",
data: JSON.stringify(jsn),
contentType: "application/json",
dataType: "json",
async: true,
success: function (data) {
result(data);
$("#modalboxProcessa").modal("hide");
},
error: function (XMLHttpRequest, txtStatus, errorThrown) {
$("#modalboxProcessa").modal("hide");
$("#modalboxErro2").modal("show");
}
});
In my local machine works properly only when I publish in the server error in ajax .
Can anyone tell me what is the problem ? I have pretty much the same ajax only returning me other than data, and is running fine .

AJAX post is empty on the server side (PHP)

I am making an AJAX request to a PHP controller, by using jQuery ajax, but when trying to get the posted data with PHP the $_POST is empty. Below is the actual function:
function GetSeriesForManufacturer(manuf) {
selectedmanufacturer = manuf;
//Make an AJax Call For Getting Series Of Manufacturer
var series = null;
$.ajax({
type: "POST",
url: url,
data: "{manufacturer:'" + selectedmanufacturer + "'}",
contentType: "application/json", //; charset=utf-8",
dataType: "json",
cache: false,
async: false,
success: function (response) {
//remove loading gif
$(".loading").hide();
//Append Data
AppendSeries($.parseJSON(response.text), selectedmanufacturer);
//Custom Scrollbar Call
$('.MatchingSeries ul').mCustomScrollbar();
},
error: function (XMLHttpRequest, textStatus, errorThrown) { }
});
}
Thanks in advance!

First, you don't need to stringify data. Just send object literal is ok.
data: {manufacturer: selectedmanufacturer},
Second, you don't need this line:
contentType: "application/json",

Let jQuery do the encoding for you:
$.ajax({
type: "POST",
url: url,
data: {
manufacturer: selectedmanufacturer
},
contentType: "application/json", //; charset=utf-8",
dataType: "json",
cache: false,
async: false,
success: function (response) {
...
},
error: function (XMLHttpRequest, textStatus, errorThrown) { }});

AJAX success call back not working

Here is the code I am using to access my web API controller named Owner; the success function is not being called. Any ideas?
$.ajax({
type: "GET",
url: 'http://localhost:26533/api/Owner',
contentType: "application/json",
dataType: "jsonp",
success: function (response) { alert("yes"); }
});

Remove the contentType and dataType and check the response..
Here an example:
$.ajax({
type: 'GET',
url: 'http://localhost:26533/api/Owner',
success: function(data){
alert(data);
},
error: function(xhr, type, exception) {
// if ajax fails display error alert
alert("ajax error response type " + type);
}
});
With this you can see what's wrong...

Cross domain Ajax Call

While calling MVC webservice from my html page it was always going to error; please help me
$.ajax({
type: "GET",
url: url,
contentType: "application/json; charset=utf-8",
crossDomain: true,
dataType: "json",
success: function (msg) {
alert(Response.ErrorMessage )
},
error: function (e, status) {
alert(e + " Fail " + status)
}
});

You have to setup CORS (http://www.html5rocks.com/en/tutorials/cors/) or use JSONP. If you decide to use JSONP then you have to send proper callback function name with JSON data.