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Javascript to warn the user that they will lose data if they go away from this page

/ Published in: JavaScript
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Easy to use in C# ASP.NET:
to prevent a user from losing data when navigating away from whatever page they are on, just add
string setConfirmUnload = "setConfirmUnload(true);";
ScriptManager.RegisterStartupScript(this, this.GetType(), "", setConfirmUnload, true);
to you code somewhere, or just call
setConfirmUnload(true);
from the onClick or onClientClick even of a link.
To allow a link to navigate away, pass in false instead.

Might be handy on an ASP.NET master page.

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Copy this code and paste it in your HTML 
  1. function setConfirmUnload(on) {
  2.             window.onbeforeunload = (on) ? unloadMessage : null;
  3.         }
  4.         function unloadMessage() {
  5.             return 'You have entered new data on this page.  If you navigate away from this page without first saving your data, the changes will be lost.';
  6.         }

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