Ext version tested:
  • Sencha Touch 2.0.1

Browser versions tested against:
  • Safari 6
  • Chrome 21.0.1180.89

DOCTYPE tested against:
  • HTML5

  • Setting the "preload" variable on a media element such as Video does not actually have any effect.

Steps to reproduce the problem:
  • Create an Ext.Video
  • Use "preload" config attribute (which defaults to "true")
  • Note how nothing actually happens in the DOM with the preload attribute and the video will preload no matter what (default handling by browser)

The result that was expected:
  • Setting preload to false should prevent preloading and add an attribute to video element 'preload="none"'
  • Otherwise, preload should be 'preload="auto"' or just non-existant (this works because of default behavior)

The result that occurs instead:
  • The preload attribute has no bearing on the DOM or the preloading of the video

Test Case:

    Ext.create('Ext.Video', config:{preload: false, url: '<VIDEO URL HERE>'});


Debugging already done:
  • Preload just simply has no bearing on anything once set

Possible fix:
Ext.define('YourProject.Media', {
	override: 'Ext.Media',

	applyPreload: function(preload)
		if (preload === true)
			preload = 'auto';
		else if (preload === false)
			preload = 'none';
		else if (Ext.isString(preload) == false)
			preload = 'auto';

		return preload;

	updatePreload: function(newPreload, oldPreload)
		var media =,
			dom = media.dom,
			el = Ext.get(dom);

		el.set({preload: newPreload});