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POStop User Leaving Before Postback (Javascript/ASP.NET)
 

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  1. POStop User Leaving Before Postback (Javascript/ASP.NET)
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    <p>I have several functions running on a postback that can take a little time to complete.</p> <p>When postback is initiated I show a loading image with this code:</p> <pre><code>function showLoader() { document.getElementById("&lt;%=loadingImage.ClientID%&gt;").style.visibility="visible"; } </code></pre> <p>I want to be able to add code to this function so if user tries to leave at this point they are informed the operation is not complete.</p> <p>I found this code:</p> <pre><code>function goodbye(e) { if(!e) e = window.event; //e.cancelBubble is supported by IE - this will kill the bubbling process. e.cancelBubble = true; e.returnValue = 'You sure you want to leave?'; //This is displayed on the dialog //e.stopPropagation works in Firefox. if (e.stopPropagation) { e.stopPropagation(); e.preventDefault(); } } window.onbeforeunload=goodbye; </code></pre> <p>This works but I only want the code to be active when the loading image is active.</p> <p>I tried the following but it shows the alert message when the page eventually posts back:</p> <pre><code>function goodbye(e) { if(!e) e = window.event; //e.cancelBubble is supported by IE - this will kill the bubbling process. e.cancelBubble = true; e.returnValue = 'You sure you want to leave?'; //This is displayed on the dialog //e.stopPropagation works in Firefox. if (e.stopPropagation) { e.stopPropagation(); e.preventDefault(); } } function showLoader() { document.getElementById("&lt;%=loadingImage.ClientID%&gt;").style.visibility="visible"; window.onbeforeunload=goodbye; } </code></pre> <p>Any ideas how I can tweak this to just show when user leaves page and not when postback completes? </p>
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