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);
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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