ZK Component Reference/Multimedia and Miscellaneous/Audio

Audio

• Demonstration: Audio
• Java API: Audio
• JavaScript API: Audio

Employment/Purpose

An audio component is used to play the audio at the browser. Like image, you could use the src property to specify an URL of an audio resource, or the setContent method to specify a dynamically generated audio. Developers might be able to control the play of an audio by the play, stop and pause methods.

Example

 <audio src="music.wav" controls="true"></audio>

The audio supports controls property Since  7.0.0

Supports HTML5

Since 7.0.0

The audio component has now been enhanced to support HTML 5, it includes the properties like autoplay, controls, loop, muted and preload.

Multiple Sources

Since 7.0.0 Most browsers do not support all the audio formats,so we could specify multiple source files in different formats for different browsers. For examples:

 <audio src="music.wav, music.mp3, music.ogg" controls="true"></audio>

StateChangeEvent

Since 9.6.0

When you call play(), stop(), pause() or the audio is played to the end, an StateChangeEvent will be fired. You can check the current state by calling event.getState(). There are 4 states: Audio.PLAY, Audio.STOP, Audio.PAUSE and Audio.END.

For example:

If you want to do something after the audio starts to play, you can write codes as shown below (MVVM pattern).

  <audio onStateChange="@command('stateChange', event=event)" />

  @Command
  public void stateChange(@BindingParam("event") StateChangeEvent event) {
    if (event.getState() == Audio.PLAY) {
      // do something...
    }
  }

Supported Events

Name	Event Type
onStateChange	Event: StateChangeEvent Notifies when invoking play(), stop(), pause() or the audio is played to the end.

• Inherited Supported Events: XulElement

Supported Children

* Track

Use Cases

Version	Description	Example Location

Version History

Version	Date	Content
7.0.0	August, 2013	Audio now supports HTML 5
9.5.0	September 2020	ZK-4648: Audio supports to add tracks
9.6.0	May 2021	ZK-4779: audio supports to fire an event upon its playing state