The onload
property of the GlobalEventHandlers
mixin is an event handler for the load
event of a Window
, XMLHttpRequest
, <img>
element, etc., which fires when the resource has loaded.
Syntax
window.onload = funcRef;
Value
funcRef
is the handler function to be called when the window's load
event fires.
Examples
window.onload = function() { init(); doSomethingElse(); };
<!doctype html> <html> <head> <title>onload test</title> // ES5 <script> function load() { console.log("load event detected!"); } window.onload = load; </script> // ES2015 <script> const load = () => { console.log("load event detected!"); } window.onload = load; </script> </head> <body> <p>The load event fires when the document has finished loading!</p> </body> </html>
Notes
The load
event fires at the end of the document loading process. At this point, all of the objects in the document are in the DOM, and all the images, scripts, links and sub-frames have finished loading.
There are also Gecko-Specific DOM Events like DOMContentLoaded
and DOMFrameContentLoaded
(which can be handled using EventTarget.addEventListener()
) which are fired after the DOM for the page has been constructed, but do not wait for other resources to finish loading.
Specifications
Specification | Status | Comment |
---|---|---|
WHATWG HTML Living Standard The definition of 'onload' in that specification. |
Living Standard | Initial definition |
Browser Compatibility
Feature | Chrome | Edge | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
---|---|---|---|---|---|---|
Basic support | (Yes) | (Yes) | ? | ? | ? | ? |
Feature | Android | Android Webview | Edge | Firefox Mobile (Gecko) | Firefox OS | IE Mobile | Opera Mobile | Safari Mobile | Chrome for Android |
---|---|---|---|---|---|---|---|---|---|
Basic support | ? | (Yes) | (Yes) | ? | ? | ? | ? | ? | (Yes) |
See also
DOMContentLoaded
event in Listening to events: Simple DOM events- IIFE Immediately-invoked function expression
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