onloadstart Event
Example
Call a function when the video is starting to load:
<video onloadstart="myFunction()">
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More examples below.
Description
The onloadstart event occurs when the browser
starts the loading process of an audio or video.
In other words: When the browser starts searching for an audio or video.
Audio and Video Events
While loading a media, these events occur in the following order:
| Event | Occurs When |
|---|---|
| onloadstart | The loading of a media starts |
| ondurationchange | The duration of a media is changed |
| onloadedmetadata | The meta data for a media has been loaded |
| onloadeddata | A media frame is loaded |
| onprogress | The browser is loading a media |
| oncanplay | An element's scrollbar is being scrolled |
| oncanplaythrough | The browser estimates it can play a media |
| onplay | A media starts to play |
| onplaying | A media starts or resumes |
| ontimeupdate | The indicated time is changed |
| onended | A media has reached the end |
Events that can occur while a media is loading or playing:
| Event | Occurs When |
|---|---|
| onabort | The loading of a media is aborted |
| onemptied | A media is empty (already loaded) |
| onerror | An error occurs while loading a media |
| onpause | A media is paused |
| onratechange | The playback rate is changed |
| onseeked | A user has seeked a new media position |
| onseeking | A user start seeking a new media position |
| onstalled | Media data is not available |
| onsuspend | The browser is not getting the media data |
| onvolumechange | The volume of a media is changed |
| onwaiting | A media is waiting for the next frame |
See Also:
Syntax
In JavaScript, using the addEventListener() method:
object.addEventListener("loadstart", myScript);
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Technical Details
| Bubbles: | No |
|---|---|
| Cancelable: | No |
| Event type: | ProgressEvent |
| HTML tags: | <audio> and <video> |
| DOM Version: | Level 3 Events |
More Examples
Example
Call a function when an audio starts loading:
<audio onloadstart="myFunction()">
Try it Yourself »
Browser Support
onloadstart is a DOM Level 3 (2004) feature.
It is fully supported in all modern browsers:
| Chrome | Edge | Firefox | Safari | Opera | IE |
| Yes | Yes | Yes | Yes | Yes | 11 |
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