close

The close event is executed when a request has been made to close the window when the user presses the close button.

If an event handler is placed on the window element, it can be prevented to close (see example below). Note that the close event is only fired when the user presses the close button on the titlebar; (i.e. not File -> Quit). The unload event should be used to capture all attempts to unload the window.

General info

Specification: XUL
Interface: Event
Bubbles: No
Cancelable: No
Target: window
Default Action: The window is closed.

Properties

Property	Type	Description
`target` Read only	`EventTarget`	The event target (the topmost target in the DOM tree).
`type` Read only	`DOMString`	The type of event.
`bubbles` Read only	`Boolean`	Whether the event normally bubbles or not.
`cancelable` Read only	`Boolean`	Whether the event is cancellable or not.

Example

window.addEventListener("close", function( event ) {
  // make the close button ineffective
  event.preventDefault();
}, false);