How to get AJAX post return value?

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I have a AJAX function to post for data processing in an .ashx file.

JavaScript

var b = false;
$.ajax({
    async: true,
    contentType: 'application/json; charset=utf-8',
    type: "POST",
    dataType: 'json',
    data: JSON.stringify(arrays),
    url: "MyHandler.ashx",
    success: function (result) {
        b = true;
    },
    error: function () {
        alert('Error occurred');
    }
});

I want set the value of b after it runs successfully. I set a break point at b = true; if it runs successfully. But the program runs without stopping at the break point. It means I did not get the Post Return actually. What's wrong in my code? Thanks.

What I have tried:

C#

How to get AJAX Post return value?

Posted 11-Oct-16 5:10am

s yu

Updated 11-Oct-16 5:33am

v2

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Karthik_Mahalingam 11-Oct-16 11:13am

check the console window for any error message in network tab.

ZurdoDev 11-Oct-16 11:19am

"But the program runs with stopping at the break point" - Do you mean without?

Put a breakpoint in your success function and one in your error function. Also put one at $.ajax( and make sure it is even getting there. It has to go somewhere.

s yu 11-Oct-16 11:34am

Yes for 'Without'. Sorry for my miss-typing. Thanks

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F-ES Sitecore · Answer 1 · 2016-10-11T05:24:00

Whatever code you have that uses "b" needs to go in the success event also, or put it in a function that the success event code calls.

JavaScript

success: function (result) {
        b = true;
        process(b);
    },

JavaScript

function process(result){
if (result){
    //
}
}

Your ajax call is asynchronous so your code doesn't halt at the $.ajax line, it continues on to the code after while the ajax call completed in the background. The cheaper alternative is to leave your code as it is and make the ajax call synchronous rather than asynchronous by adding

async: false

to the options.

jQuery.ajax() | jQuery API Documentation[^]

How to get AJAX post return value?

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