HTML Reference Manual

HTML Tag Reference

HTML Audio/Video DOM loadstart event

loadstart event is fired when the browser starts to load a resource file.

Online Example

Hint: The video has started to load:

Example

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>HTML Audio/Video onloadstart event usage-Basic Tutorial(oldtoolbag.com)</title>
</head>
<body>
<video id="video1" controls="controls">
　　<source src="movie.mp4" type="video/mp4">
　　<source src="movie.ogg" type="video/ogg">
　　Your browser does not support HTML5　video tag.
</video>
<script>
myVid=document.getElementById("video1");
myVid.onloadstart=alert("Starting to load video");
</script>　
</body>
</html>

Test to see ‹/›

Definition and Usage

When the browser starts to search for the specified audio/video, the loadstart event occurs. This is the time when the loading process begins

In audio/The following events occur in the order listed during the video loading process:

Browser Compatibility

IEFirefoxOperaChromeSafari

All major browsers support the loadstart event.

Note:Internet Explorer 8 and earlier versions do not support this event.

Syntax

In HTML:

<audio|video onloadstart="SomeJavaScriptCode">

In JavaScript:

audio|video.onloadstart=SomeJavaScriptCode;

Use addEventListener():

audio|video.addEventListener("loadstart", function()
　 {
　 //SomeJavaScriptCode
　 }
);

Technical Details

The following HTML tags support:	<audio>, <video>
The following JavaScript objects support:	Audio, Video

More Examples

Use the onloadstart attribute on HTML elements

Use addEventListener() to listen to the loadstart event

　HTML Audio/Video DOM Reference Manual

HTML: <template> tag