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Controlling Media with JavaScript Because the and elements are part of the HTML5 standard, there are JavaScript methods, properties, and DOM events associated with them. There are methods for loading, playing, pausing, and jumping to a time. There are also properties you can set programmatically, such as the src URL and the height and width of a video, as well as read-only properties such as the video’s native height. Finally, there are DOM events you can listen for, such as load progress, media playing, media paused, and media done playing.

Deal folks Good day Of late I am doing a lot of reading of web pages on my ipad 2 ( upgraded to latest iOS and all legal no jail break ).

This chapter shows you how to do the following: • Use JavaScript to create a simple controller. • Change the size of a movie dynamically.

• Display a progress indicator while the media is loading. Windows 10 for mac. • Replace one movie with another when the first finishes. • Keep the playback of multiple media elements in perfect sync.

• Provide fallback content using JavaScript if none of the media sources is playable. • Enter and exit full-screen mode. • Take your custom video player and controls into full-screen mode. For a complete description of all the methods, properties, and DOM events associated with HTML5 media, see. All the methods, properties, and DOM events associated with HTMLMediaElement, HTMLAudioElement, and HTMLVideoElement are exposed to JavaScript. A Simple JavaScript Media Controller and Resizer Listing 4-1 creates a simple play/pause movie control in JavaScript, with additional controls to toggle the video size between normal and doubled.

It is intended to illustrate, in the simplest possible way, addressing a media element, reading and setting properties, and calling methods. Any of the standard ways to address an HTML element in JavaScript can be used with or elements. You can assign the element a name or an id, use the tag name, or use the element’s place in the DOM hierarchy. The example in Listing 4-1 uses the tag name. Since there is only one element in the example, it is the 0th item in the array of elements with the “video” tag name.

Listing 4-1 Adding simple JavaScript controls. Note: Safari on iOS version 3.2 does not support dynamically resizing video on the iPad. Using DOM Events to Monitor Load Progress One of the common tasks for a movie controller is to display a progress indicator showing how much of the movie has loaded so far. One way to do this is to constantly poll the media element’s buffered property, to see how much of the movie has buffered, but this is a waste of time and energy. It wastes processor time and often battery charge, and it slows the loading process. A much better approach is to create an event listener that is notified when the media element has something to report.

Adobe photoshop os x torrent. Once the movie has begun to load, you can listen for progress events. You can read the buffered value when the browser reports progress and display it as a percentage of the movie’s duration. Another useful DOM event is canplaythrough, a logical point to begin playing programmatically. You can install event listeners on the media element or any of its parents, up to and including the document body. Listing 4-2 loads a large movie from a remote server so you can see the progress changing. It installs an event listener for progress events and another for the canplaythrough event. It indicates the percentage loaded by changing the inner HTML of a paragraph element.

You can copy and paste the example into a text editor and save it as HTML to see it in action. Listing 4-2 Installing DOM event listeners. Note: On the iPad, Safari does not begin downloading until the user clicks the poster or placeholder. Currently, downloads begun in this manner do not emit progress events. The buffered property is a TimeRanges object, essentially an array of start and stop times, not a single value. Consider what happens if the person watching the media uses the time scrubber to jump forward to a point in the movie that hasn’t loaded yet—the movie stops loading and jumps forward to the new point in time, then starts buffering again from there.