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POIterate on array, calling $.ajax for each element. Return array with all ajax results
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  1. POIterate on array, calling $.ajax for each element. Return array with all ajax results
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    copied!<p>I've just started working with JavaScript for non-trivial things, so this is probably straightforward...</p> <p>What I'm trying to accomplish: iterate on an array of product references, fetch the JSON for each reference, and return an array of all the product information (with a hash-like structure indexed by reference).</p> <p>What I've tried:</p> <pre><code>function fetchProductData(references){ var product_data = new Object(); references.forEach(function(ref){ $.ajax({ url: "http://localhost:3000/products/find.js?reference=" + ref, dataType: "jsonp", type: "GET", processData: false, contentType: "application/json", success: function(data) { product_data[ref] = data; } }); }); alert('before return: ' + product_data); return product_data; }; $(document).ready(function(){ var products = fetchProductData(references); alert('products : ' + products); }); </code></pre> <p>Here's what I don't understand: the first time I call <code>alert</code> to display the array contents, the array is empty. However, on the second call, the array is populated with the data I want.</p> <p>In other words, the "products :" <code>alert</code> displays the data I want in the code above. But if I comment the "before return: " <code>alert</code>, it no longer does. Why is this?</p> <p>So my question is: how can I have jQuery make several $.ajax call to fetch product information, collect that information in an array, and return that array so I can use it elsewhere in my code?</p> <p>Also, why is the data in the variable magically accessible after it is referenced in an <code>alert</code>?</p>
 

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