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    <p>Here is a solution:</p> <pre><code>function appendToSelect() { $("#mySelect").children().remove(); $("#mySelect").html( '&lt;option selected value="'+obj.data[0].value+'"&gt;' + obj.data[0].name + '&lt;/option&gt;' ); obj.data.splice(0, 1); // we only want remaining data var appendOptions = function() { var dataChunk = obj.data.splice(0, 10); // configure this last number (the size of the 'chunk') to suit your needs for(var i = 0; i &lt; dataChunk.length; i++) { $("#mySelect").append( '&lt;option value="' + dataChunk[i].value + '"&gt;' + dataChunk[i].name + '&lt;/option&gt;' ); } if(obj.data.length &gt; 0) { setTimeout(appendOptions, 100); // change time to suit needs } }; appendOptions(); // kicks it off } </code></pre> <p>Not as elegant as <a href="https://stackoverflow.com/questions/210821/giving-brief-control-back-to-the-browser-during-intensive-javascript-processing#210968">@Borgar's</a> solution, but you get the idea. Basically, I am doing the same thing, but all in your one function rather than breaking it into a higher-order function like he does. I like his solution, but if you don't, perhaps this will work for you.</p> <hr> <p>EDIT: For those that don't immediately see it, one of the main differences between this solution and <a href="https://stackoverflow.com/questions/210821/giving-brief-control-back-to-the-browser-during-intensive-javascript-processing#210968">@Borgar's</a> is that this solution allows you to set the size of the 'chunks' of data that is processed between each timeout. <a href="https://stackoverflow.com/questions/210821/giving-brief-control-back-to-the-browser-during-intensive-javascript-processing#210968">@Borgar's</a> times-out after <em>every single member</em> of the array is processed. If I get time, I will try to create a higher-order function to handle this so it is more elegant. No promises though! ;)</p> <hr> <p>EDIT: So, here is my adaptation of <a href="https://stackoverflow.com/questions/210821/giving-brief-control-back-to-the-browser-during-intensive-javascript-processing#210968">@Borgar's</a> solution, which allows for setting a 'chunk' size and configuring the timeout value more easily:</p> <pre><code>function incrementallyProcess(workerCallback, data, chunkSize, timeout, completionCallback) { var itemIndex = 0; (function() { var remainingDataLength = (data.length - itemIndex); var currentChunkSize = (remainingDataLength &gt;= chunkSize) ? chunkSize : remainingDataLength; if(itemIndex &lt; data.length) { while(currentChunkSize--) { workerCallback(data[itemIndex++]); } setTimeout(arguments.callee, timeout); } else if(completionCallback) { completionCallback(); } })(); } function appendToSelect() { $("#mySelect").children().remove(); $("#mySelect").html( '&lt;option selected value="' + obj.data[0].value + '"&gt;' + obj.data[0].name + '&lt;/option&gt;' ); obj.data.splice(0,1); // we only want remaining data incrementallyProcess(function(data) { $("#mySelect").append( '&lt;option value="' + data.value + '"&gt;' + data.name + '&lt;/option&gt;' ); }, obj.data, 10, 100, removeAnimatedGifFunction); // last function not required... } </code></pre> <p>Hope that helps - I think this combines the best of both solutions. <strong>Notice</strong>, the second anonymous function no longer uses the index value, but simply passes in the entire object (with the value and name properties); that makes it a bit cleaner, since the index of the current object really isn't <em>usually</em> that useful when iterating over things, IMO.</p> <p>I am sure there are still things that could be done to make this even better, but that is left as an exercise for the reader. ;)</p>
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