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JavaScript Media onloadstart Event

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JavaScript Media onloadstart Event

The onloadstart event occurs when the browser has started to load a media (resource).

onloadstart Event as Attribute

Example

HTML Online Editor
<!DOCTYPE html> <html> <body> <video onloadstart="myFunction()" controls> <source src="/hawk.mp4" type="video/mp4"> </video> <script> function myFunction(){ alert("Video started loading"); } </script> </body> </html>

Syntax

As Attribute

<element onloadstart = "JavaScript">

As Property

object.onloadstart = function(){ // code };

Using Event Listener

object.addEventListener("loadstart" , myScript);

Browser Support

Devicedesktopmobile
Browsergoogle chromesafarifirefoxinternet Exploreredgeoperagoogle chromesafarifirefoxedgeoperaandroid webviewsamsung internet
onloadstartYesYesYesYesYesYesYesYesYesYesYesYesYes

onloadstart Event as Property

Example

HTML Online Editor
<!DOCTYPE html> <html> <body> <video controls> <source src="/hawk.mp4" type="video/mp4"> </video> <script> var x = document.getElementsByTagName("video")[0]; function myFunction(){ alert("Video started loading"); } x.onloadstart = myFunction; </script> </body> </html>

Using addEventListener() Method

Note: The addEventListener() method is not supported in Internet Explorer 8 and below.

Example

HTML Online Editor
<!DOCTYPE html> <html> <body> <video controls> <source src="/hawk.mp4" type="video/mp4"> </video> <script> var x = document.getElementsByTagName("video")[0]; function myFunction(){ alert("Video started loading"); } x.addEventListener("loadstart", myFunction); </script> </body> </html>

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