The beforeunload
event is fired when the window, the document and its resources are about to be unloaded.
When a non-empty string is assigned to the returnValue
Event property, a dialog box appears, asking the users for confirmation to leave the page (see example below). When no value is provided, the event is processed silently. Some implementations only show the dialog box if the frame or any embedded frame receives a user gesture or user interaction. See Browser compatibility for more information.
<div id="interfaceDiagram" style="display: inline-block; position: relative; width: 100%; padding-bottom: 20%; vertical-align: middle; overflow: hidden;"><svg style="display: inline-block; position: absolute; top: 0; left: 0;" viewbox="-50 0 600 120" preserveAspectRatio="xMinYMin meet"><a xlink:href="https://developer.mozilla.org/en-US/docs/Web/API/Event" target="_top"><rect x="1" y="1" width="75" height="50" fill="#fff" stroke="#D4DDE4" stroke-width="2px" /><text x="38.5" y="30" font-size="12px" font-family="Consolas,Monaco,Andale Mono,monospace" fill="#4D4E53" text-anchor="middle" alignment-baseline="middle">Event</text></a><polyline points="76,25 86,20 86,30 76,25" stroke="#D4DDE4" fill="none"/><line x1="86" y1="25" x2="116" y2="25" stroke="#D4DDE4"/><a xlink:href="https://developer.mozilla.org/en-US/docs/Web/API/BeforeUnloadEvent" target="_top"><rect x="116" y="1" width="170" height="50" fill="#F4F7F8" stroke="#D4DDE4" stroke-width="2px" /><text x="201" y="30" font-size="12px" font-family="Consolas,Monaco,Andale Mono,monospace" fill="#4D4E53" text-anchor="middle" alignment-baseline="middle">BeforeUnloadEvent</text></a></svg></div>
a:hover text { fill: #0095DD; pointer-events: all;}
Bubbles | No |
Cancelable | Yes |
Target objects | defaultView |
Interface | Event |
Examples
window.addEventListener("beforeunload", function( event ) {
event.returnValue = "\o/";
});
// is equivalent to
window.addEventListener("beforeunload", function( event ) {
event.preventDefault();
});
WebKit-derived browsers don't follow the spec for the dialog box. An almost-cross-browser working example would be close to the below example.
window.addEventListener("beforeunload", function (e) {
var confirmationMessage = "\o/";
(e || window.event).returnValue = confirmationMessage; // Gecko + IE
return confirmationMessage; /* Safari, Chrome, and other
* WebKit-derived browsers */
});
Specifications
Specification | Status | Comment |
---|---|---|
HTML Living Standard The definition of 'BeforeUnloadEvent' in that specification. |
Living Standard | Initial definition |
Browser compatibility
BCD tables only load in the browser