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copied!<p>The mechanism for feedback should be different for the duration the user has to wait. Less than 0.1 seconds and a user will not notice. </p> <p>Between 1 and 10 seconds you can simply display a symbol such as an animated gif of some sort that indicates your app is processing. See <a href="http://www.ajaxload.info/" rel="nofollow noreferrer">http://www.ajaxload.info/</a> I use a div with an ID "processing" and style it with a spinner and use the following jquery code to show and hide it before and after the process.</p> <pre><code>function showProcessing(){ $("#processing").fadeIn("fast"); } function hideProcessing(){ $("#processing").fadeOut("fast"); } </code></pre> <p>Beyond 10 seconds it would be ideal to provide an estimate of processing time.</p> <p>See <a href="http://www.useit.com/papers/responsetime.html" rel="nofollow noreferrer">Response Time Overview</a> for the source of these numbers.</p> <p>The following code immediately changes the link colour to red and calls the append method a fraction of a second later. Essentially is allows the browser to execute a separate thread before getting hung up in a loop. The timeout may need to be adjusted depending on the browser. Check out Neil Mix's <a href="http://www.neilmix.com/2007/02/07/threading-in-javascript-17/" rel="nofollow noreferrer">Threading in JavaScript 1.7</a> if you need to relinquish control in a more generic manner.</p> <pre><code> function startAppend(){ for (var i = 0; i < 1500; i++){ appendContent(); } } clickLink.onclick = function(){ clickLink.style.color = "red"; setTimeout('startAppend()', 10) }; </code></pre>

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