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

Browser Compatibility

[1] As of Firefox 52, The loadstart event is now fired on <img> elements.