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onloadstart Event

❮ DOM Events ❮ ProgressEvent

Example

Execute a JavaScript when the video is starting to load:

<video onloadstart="myFunction()">
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More "Try it Yourself" examples below.

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:

  1. onloadstart
  2. ondurationchange
  3. onloadedmetadata
  4. onloadeddata
  5. onprogress
  6. oncanplay
  7. oncanplaythrough

Browser Support

The numbers in the table specify the first browser version that fully supports the event.

Event
onloadstart Yes 9.0 Yes Yes Yes

Syntax

In HTML:

<element onloadstart="myScript">
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In JavaScript:

object.onloadstart = function(){myScript};
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In JavaScript, using the addEventListener() method:

object.addEventListener("loadstart", myScript);
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Note: The addEventListener() method is not supported in Internet Explorer 8 and earlier versions.

Technical Details

Bubbles: No
Cancelable: No
Event type: ProgressEvent
Supported HTML tags: <audio> and <video>
DOM Version: Level 3 Events

More Examples

Example

Execute a JavaScript when the audio is starting to load:

<audio onloadstart="myFunction()">
Try it Yourself »

❮ DOM Events ❮ ProgressEvent