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onunload event

Fires immediately before the object is unloaded.



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


Event information

Synchronous No
Bubbles No
Cancelable No


Event handler parameters

Standards information


If you call window.IHTMLWindow2::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:

For security reasons, the HTMLWindowEvents2::onunload event does not open modeless dialog boxes, such as those created with the IHTMLWindow2::alert method or the IHTMLWindow3::showModelessDialog method. This changes affects webpages displayed in IE9 Standards mode or later document modes.

The pEvtObj parameter is required for the following interfaces:

See also





About the Pop-up Blocker