Question

184

Waiting for AJAX request to finish?

rated 0 times [ 187] [ 3] / answers: 1 / hits: 16059 / 13 Years ago, thu, april 21, 2011, 12:00:00

I have a problem that is confusing me at the moment. I am using ajax to get some ID's from a website. Once it's complete I want to store the ID's in a variable for further processing. I have my code laid out like this:

var ids;



function get_ids() { ... Get the ID's from the site and store them in the global variable ids ... }



get_ids();

alert(ids.length);

As you can see ids will always be 0 because the script will continue to run before the ajax request in get_ids has had a chance to respond.

What's the best way to what I'm trying to do? I want to wait until get_ids has finished.

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janjadonb

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answered 13 Years ago terrellhunterm · Accepted Answer

You need to make get_ids take a callback parameter and call it when it receives a response.

For example:

function get_ids(callback) {

    ...

        response: function(data) {

            ...

            callback(data);

        }

    ...

}



get_ids(function(ids) { 

    ...

});