onbeforeunload Property
Returns or sets a Variant that represents the value of the onbeforeunload attribute that is the name of the script to run when the onbeforeunload event fires.
expression.onbeforeunload
*expression * Required. An expression that returns one of the objects in the Applies To list.
Example
The following example sets the onbeforeunload attribute for the BODY element in the active document.
ActiveDocument.body.onbeforeunload = "script()"
Applies to | FPHTMLBody Object | FPHTMLFrameSetSite Object | FPHTMLWindow2 Object | FPHTMLWindowProxy Object | IHTMLBodyElement Object | IHTMLFrameSetElement Object | IHTMLWindow2 Object