HTMLMediaElement: durationchange event

Baseline

Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

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The durationchange event is fired when the duration attribute has been updated.

Syntax

Use the event name in addEventListener():

addEventListener("durationchange", (event) => { })

Alternatively, assign to the event handler property of the interface:

ondurationchange = (event) => { }

Event type

A generic Event.

Examples

These examples add an event listener for the HTMLMediaElement's durationchange event, then post a message when that event handler has reacted to the event firing.

Using addEventListener():

const video = document.querySelector("video");

video.addEventListener("durationchange", (event) => {
  console.log("Not sure why, but the duration of the video has changed.");
});

Using the ondurationchange event handler property (but note that this replaces other event listeners added using ondurationchange, if any):

const video = document.querySelector("video");

video.ondurationchange = (event) => {
  console.log("Not sure why, but the duration of the video has changed.");
};