onunload event

[This documentation is preliminary and is subject to change.]

Fires immediately before the object is unloaded.

HTML Attribute	<element onunload = "handler(event)">
Event Property	object.onunload = handler;
attachEvent Method	object.attachEvent("onunload", handler)

If you call window.open from this event, the Pop-up Blocker feature in Microsoft Internet Explorer 6 prevents the pop-up window from appearing.

Removes the object or document from the browser window.

To invoke this event, do one of the following:

Close the current window.
Navigate to another location by entering a new address or selecting a Favorite.
Click the Back, Forward, Refresh, or Home button.
Click an anchor that refers the browser to another document.
Invoke the anchor.click method.
Invoke the document.write method.
Invoke the document.open method.
Invoke the document.close method.
Invoke the window.close method.
Invoke the window.open method, providing the possible value _self for the window name.
Invoke the window.navigate or NavigateAndFind method.
Invoke the location.replace method.
Invoke the location.reload method.
Specify a new value for the location.href property.
Submit a form to the address specified in the ACTION attribute via the INPUT type=submit control, or invoke the form.submit method.

The pEvtObj parameter is required for the following interfaces:

Additional resources