GlobalEventHandlers.onload
The onload
property of the
GlobalEventHandlers
mixin is an event handler that
processes load
events on a Window
,
XMLHttpRequest
, <img>
element, etc.
The load
event fires when a given resource has loaded.
Syntax
target.onload = functionRef;
Value
functionRef
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 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 |
---|
HTML Standard # handler-onload |
Browser compatibility
BCD tables only load in the browser
See also
load
eventDOMContentLoaded
event in Listening to events: Simple DOM events- IIFE Immediately-invoked function expression