TextTrackList.onremovetrack

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TextTrackList onremovetrack event handler is called when the removetrack event occurs, indicating that a text track has been removed from the media element, and therefore also from the TextTrackList .

The event is passed into the event handler in the form of a TrackEvent object, whose track property identifies the track that was removed from the media element's TextTrackList .

注意： You can also add a handler for the removetrack event using addEventListener() .

句法

TextTrackList.onremovetrack = eventHandler;

值

Set onremovetrack to a function that accepts as input a TrackEvent object which indicates in its track property which text track has been removed from the media element.

范例

This simple example just fetches the current number of text tracks in the first media element whenever a track is removed from the media element.

document.querySelectorAll("video, audio")[0].textTracks.onremovetrack = function(event) {
  myTrackCount = document.querySelectorAll("video, audio")[0].textTracks.length;
};

The current number of text tracks remaining in the media element is obtained from TextTrackList property length .

规范

规范	状态	注释
HTML 实时标准 The definition of 'TextTrackList: onremovetrack' in that specification.	实时标准

浏览器兼容性

The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

No compatibility data found. Please contribute data for "api.TextTrackList.onremovetrack" (depth: 1) to the MDN 兼容性数据存储库 .

元数据

最后修改： May 31, 2019

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