How do I change the value of a variable inside of a function

Question

I want to change the value of a variable. I tried the following method but it does not work:

    function MapData() {
      var  bbs=0 ;
        $.ajax({
            url: "/admin/subfactors/BBth",
            type: "GET",
            success: function (result) {
                bbs = result;
               }
            }
        });
        return bbs;
    };

_...change the value of a variable...._ What variable? What change? You have to be a bit more specific. So what do you want to achieve and what doesn't work with your code? — B001ᛦ, Aug 03 '20 at 18:55
@B001 I think he wanted to change the variable **"bbs"** value — Fritzdultimate, Aug 03 '20 at 18:56
Duplicate: Check this https://stackoverflow.com/questions/5316697/jquery-return-data-after-ajax-call-success — Velu S Gautam, Aug 03 '20 at 19:01
Does this answer your question? [jQuery: Return data after ajax call success](https://stackoverflow.com/questions/5316697/jquery-return-data-after-ajax-call-success) — Velu S Gautam, Aug 03 '20 at 19:02
My Ajax returns a float that shows when alerted. I want the value of the returned number to be equal to the value of the bbs. — amir barghi, Aug 04 '20 at 07:13

score 2 · Answer 1 · answered Aug 03 '20 at 18:56

$.ajax is asynchronous, so you need to wait for it to complete:

async function MapData() {
    var  bbs=0 ;
    bbs = await $.ajax({
        url: "/admin/subfactors/BBth",
        type: "GET",
    });
    return bbs;
});

and then when you call it:

let bbs = await MapData()

score 1 · Answer 2 · answered Aug 03 '20 at 18:57

You need to use callbacks (or some other way to handle async behavior) (your ajax request is async, and therefore your return is happening before the request completes.

function MapData(cb) {
$.ajax({
    url: "/admin/subfactors/BBth",
    type: "GET",
    success: function (result) {
        cb(result)
       }
    }
});

function cb(result) {
    console.log(result)
}

MapData(cb)

How do I change the value of a variable inside of a function

2 Answers2