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    <p>Typical mistake. The code after the Ajax call</p> <pre><code>alert(output); return json; </code></pre> <p>is executed, <em>before</em> the Ajax call returns. It is <strong>asynchronous</strong> (meaning, it is not executed when and where you put it in the code, but at some later point in time). You can provide a callback to your function, like so:</p> <pre><code>// cb is our callback - it is a function function queryCostCenter(user_id, currency_id, country_id, cb){ var destinations = new Array(); var destination = { qty:1, country: country_id }; destinations.push(destination) var data = { destinations : $.toJSON(destinations), user_id : user_id, currency_id: currency_id }; $.ajax({ data: data, type: 'POST', url: '/lib/ajax/ajax_prepaid_cost_calculator.php', success: function(result) { // or just `success: cb` cb(result); // execute the callback with the returned data } }); } </code></pre> <p>then:</p> <pre><code>queryCostCenter(some_value, some_value, some_value, function(result) { // do something with the returned data. }); </code></pre> <p>Or put all the logic in the success handler of the Ajax call. But with a callback function, you are more flexible and you can better reuse the function.</p> <hr> <p>This a very common use case for callbacks. As you don't know <em>when</em> the Ajax call will be finished, you pass a function to the Ajax call that should be run, when some results is returned. Your are doing nothing else with the <code>success</code> handler: It is a function that is called when the call is finished. </p>
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    1. POjavascript/jquery scope has me stumped
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    1. USFelix Kling
    1. USFelix Kling
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    1. CO+1 most thorough + correct answer
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      1. USdanlefree
    2. COYou should mention the 'async' option.
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      1. USsje397
    3. COI'll mention it. If you set the 'async' option to false, then the script will halt until the request is finished. Add `async: false,` above where you have `data: data` and your code works as is. Here's some reading. http://api.jquery.com/jQuery.ajax/
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      1. USchriscauley
 

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