HTML onloadstart Attribute - HTML Attribute

Definition and Usage

The onloadstart event occurs when the browser starts looking for the specified audio/video. This is when the loading process starts.

During the loading process of an audio/video, the following events occur, in this order:

loadstart
durationchange
loadedmetadata
loadeddata
progress
canplay
canplaythrough

Applies to

The onloadstart attribute is part of the Event Attributes, and can be used on the following elements:

Elements	Event
<audio>	loadstart
<video>	loadstart

Browser Support

The onloadstart attribute has the following browser support for each element:

How to Run "myFunction" when the Audio data starts to load - HTML onloadstart Attribute

Play the audio file. This example demonstrates how to use the "onloadstart" attribute on an AUDIO element.

index.html

Example: HTML

<!DOCTYPE html> 
<html> 
<body> 

<audio id="myAudio" controls onloadstart="myFunction()">
  <source src="https://file-examples.com/wp-content/storage/2017/11/file_example_MP3_5MG.mp3" type="audio/ogg">
  <source src="https://file-examples.com/wp-content/storage/2017/11/file_example_MP3_5MG.mp3" type="audio/mpeg">
  Your browser does not support the audio element.
</audio>

<p>Play the audio file:</p>

<script>
function myFunction() {
  alert("The media file has started loading");
}
</script> 

<p>This example demonstrates how to use the "onloadstart" attribute on an AUDIO element.</p>

</body> 
</html>

Output should be:

How to Run "myFunction" when the Video data starts to load - HTML onloadstart Attribute

Play the video. This example demonstrates how to use the "onloadstart" attribute on a VIDEO element.

index.html

Example: HTML

<!DOCTYPE html> 
<html> 
<body> 

<video id="myVideo" width="320" height="176" controls onloadstart="myFunction()">
  <source src="https://www.sample-videos.com/video321/mp4/240/big_buck_bunny_240p_2mb.mp4" type="video/mp4">
  <source src="https://www.sample-videos.com/video321/mp4/240/big_buck_bunny_240p_2mb.mp4" type="video/ogg">
  Your browser does not support HTML5 video.
</video>

<p>Play the video:</p>

<script>
function myFunction() {
  alert("The media file has started loading");
}
</script> 

<p>This example demonstrates how to use the "onloadstart" attribute on a VIDEO element.</p>

<p>Video courtesy of <a href="https://www.bigbuckbunny.org/" target="_blank">Big Buck Bunny</a>.</p>

</body> 
</html>

Output should be:

html onloadstart attribute

Type:	Develop
Category:	Web Tutorial
Sub Category:	HTML Attribute
Uploaded by:	Admin

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