Web/API/GlobalEventHandlers/onloadstart

The onloadstart property of the GlobalEventHandlers mixin is an EventHandler representing the code to be called when the loadstart event is raised (when progress has begun on the loading of a resource.)

Syntax

img.onloadstart = funcRef;

Value

funcRef is the handler function to be called when the resource's loadstart event fires.

Examples

HTML content

<img src="myImage.jpg">

JavaScript content

// 'loadstart' fires first, then 'load', then 'loadend'

image.addEventListener('load', function(e) {
  console.log('Image loaded');
});

image.addEventListener('loadstart', function(e) {
  console.log('Image load started');
});

image.addEventListener('loadend', function(e) {
  console.log('Image load finished');
});

Specifications

Specification	Status	Comment
HTML Living StandardThe definition of 'onloadstart' in that specification.	Living Standard	Initial definition

Browser compatibility

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
onloadstart	Chrome Full support Yes Notes' Full support Yes Notes' Notes' The loadstart event is not fired on <img> elements.	Edge Full support 12	Firefox Full support 52	IE Full support Yes	Opera Full support Yes Notes' Full support Yes Notes' Notes' The loadstart event is not fired on <img> elements.	Safari Full support Yes Notes' Full support Yes Notes' Notes' The loadstart event is not fired on <img> elements.	WebView Android Full support Yes Notes' Full support Yes Notes' Notes' The loadstart event is not fired on <img> elements.	Chrome Android Full support Yes Notes' Full support Yes Notes' Notes' The loadstart event is not fired on <img> elements.	Firefox Android Full support 52	Opera Android Full support Yes Notes' Full support Yes Notes' Notes' The loadstart event is not fired on <img> elements.	Safari iOS Full support Yes Notes' Full support Yes Notes' Notes' The loadstart event is not fired on <img> elements.	Samsung Internet Android Full support Yes Notes' Full support Yes Notes' Notes' The loadstart event is not fired on <img> elements.

Legend

Full support  

Full support

See implementation notes.'

See implementation notes.

GlobalEventHandlers.onloadstart by Mozilla Contributors is licensed under CC-BY-SA 2.5.