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DOM:window.onunload

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« Gecko DOM Reference

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[edit] Summary

The unload event is raised when the document is unloaded.

[edit] Syntax 

window.onunload = funcRef;
  • funcRef is a reference to a function.

[edit] Example 

<html>
<head>

<title>onunload test</title>

<script type="text/javascript">

window.onunload = unloadPage;

function unloadPage()
{
 alert("unload event detected!");
}
</script>
</head>

<body>
<p>Reload a new page into the browser<br />
 to fire the unload event for this page.</p>
<p>You can also use the back or forward buttons<br />
 to load a new page and fire this event.</p>
</body>
</html>

[edit] Notes

Note that using this event handler in your page prevents Firefox 1.5 from caching the page in the in-memory bfcache. See Using Firefox 1.5 caching for details.

Browsers equipped with pop-up window blockers will ignore all window.open() method calls in onunload event handler functions.

[edit] Specification

DOM Level 0. Not part of any standard.

Retrieved from "http://developer.mozilla.org/en/docs/DOM:window.onunload"