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HTML DOM Track default Property
The HTML DOM Track default property sets/returns a boolean value corresponding to whether the track is to enabled until the user’s preference contradicts it.
NOTE: Only one track should be default per media (audio/video) element.
Following is the syntax −
Returning boolean value - true/false
trackObject.default
Setting default to booleanValue
trackObject.default = booleanValue
Here, “booleanValue” can be the following −
| booleanValue | Details |
|---|---|
| true | It defines that track willbe default enabled |
| false | It defines that track willnot be enabled unless user prefers to |
Let us see an example of Track default property −
Example
<!DOCTYPE html> <html> <head> <title>Track default</title> <style> form { width:70%; margin: 0 auto; text-align: center; } * { padding: 2px; margin:5px; } input[type="button"] { border-radius: 10px; } </style> </head> <body> <form> <fieldset> <legend>Track-default</legend> <video id="videoSelect" controls width="250" src="sample.mp4"> <track default kind="subtitles" srclang="es" src="sample-es.srt"/> <track kind="subtitles" srclang="en" src="sample-en.srt"/> </video><br> <input type="button" onclick="getTrackDetails()" value="What is the default track?"> <div id="divDisplay"></div> </fieldset> </form> <script> var divDisplay = document.getElementById("divDisplay"); var trackSelect = document.getElementsByTagName("track"); function getTrackDetails() { for(var i=0; i<trackSelect.length; i++) if(trackSelect[i].default) divDisplay.textContent = 'Default track for video: '+trackSelect[i].srclang; } </script> </body> </html> Output
Before clicking ‘What is the default track?’ button −
After clicking ‘What is the default track?’ button −
Updated on: 2019-10-29T10:56:18+05:30
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