unload

Overview Table

Synchronous	No
Bubbles	No
Target	dom/Element
Cancelable	No
Default action

## Examples

This example shows how to use the onunload event to run script when the window object has been unloaded.

<head>
<script type="text/javascript" for="window" event="onunload">
    alert("The onunload event fired for the window object.");
</script>
<script type="text/javascript">
    function fnRelocate()
    {
    location.href="/workshop/samples/author/dhtml/refs/onunloadEX_target.htm";
    }
</script>
</head>
<body>
<input type="button" value="Go To Page 2" onclick="fnRelocate()">
</body>

View live example

Notes

Remarks

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 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.

For security reasons, the unload event does not open modeless dialog boxes, such as those created with the alert method. This changes affects webpages displayed in IE9 Standards mode or later document modes. The pEvtObj parameter is required for the following interfaces:

HTMLAnchorEvents2
HTMLAreaEvents2
HTMLButtonElementEvents2
HTMLControlElementEvents2
HTMLDocumentEvents2
HTMLElementEvents2
HTMLFormElementEvents2
HTMLImgEvents2
HTMLFrameSiteEvents2
HTMLInputFileElementEvents2
HTMLInputImageEvents2
HTMLInputTextElementEvents2
HTMLLabelEvents2
HTMLLinkElementEvents2
HTMLMapEvents2
HTMLMarqueeElementEvents2
HTMLObjectElementEvents2
HTMLOptionButtonElementEvents2
HTMLScriptEvents2
HTMLSelectElementEvents2
HTMLStyleElementEvents2
HTMLTableEvents2
HTMLTextContainerEvents2
HTMLWindowEvents2

Standards information

HTML 4.01 Specification, Section 18.2.3

Attributions

Microsoft Developer Network: [Windows Internet Explorer API reference Article]