Question

I am creating an object in javascript:

    var t = null;
            $.getJSON('http://localhost:53227/Home/GetData', function (data) {
                alert(data);
                t = data;
            });
            alert(t);

When I alert data, I get an object back.
When I alert t, it’s null.

Can you please guide, how to set “t” to the returned data?

Answer 1

This will work as expected – the issue is not that t is not set, it’s that you’re doing alert(t) before the getJSON callback is executed. Try doing alert(t) immediately after t = data;

In other words, here’s your current order of operations:

1. Set t = null
2. Call server script
3. alert(t) –> t is still null!
4. (some amount of time later) receive JSON response
5. alert data
6. set t = data

…as you can see, at step 3 ‘t’ will still be null. Try this instead:

var t = null;

$.getJSON('http://localhost:53227/Home/GetData', function (data) {
    alert(data);
    t = data;
    alert(t);
});

Cheers