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POjQuery deferred ajax cache
 

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  1. POjQuery deferred ajax cache
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    <p>I read the top answer to <a href="https://stackoverflow.com/questions/4869609/how-can-jquery-deferred-be-used">this question</a> regarding the use of <a href="http://api.jquery.com/category/deferred-object/" rel="nofollow noreferrer">jQuery Deferred</a>. </p> <p>I'm looping through an array of IDs. For each ID, I need to get data pertaining to it either from an ajax request, or from a cache if an ajax request had already successfully returned the data before.</p> <p>During each loop, I use a $.when() to observe whether getData() returns something from cache or a successful ajax call, before processing that ID. The current problem is that the ID processing proceeds anyways without waiting for getData()'s ajax to succeed. </p> <p>Some pseudocode: </p> <pre><code>var IDs = ["1", "2", "1", "3", "1"]; //ID "1" is repeated //data for "1" should should require ajax get the first time //subsequent processing should get data for "1" from dataCache var dataCache = []; function getData(ID){ if (/*data for ID in dataCache*/){ //return data pertaining to ID from dataCache } else { return $.getJSON("returnJSONDataByID/" + ID, function(resp){ //push resp data to dataCache }) } } for (/*each item i in IDs*/){ $.when(getData(IDs[i])).then(function(){ //process IDs[i] data //this is the resolved handler, which should be executed //when either getData() returns data from the dataCache, //or $.getJSON succeeds //PROBLEM: this is currently executing every loop and //and doesn't wait for the ajax to return resp }) } </code></pre>
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