How do I get the reference to an existing YouTube

问题:

<iframe width="560" height="315" src="//www.youtube.com/embed/M7lc1UVf-VE" frameborder="0" allowfullscreen></iframe>

I have a few questions on what happens when I embed a YouTube video using source code like above. The code should generate a YouTube Player object that processes the video the way users like. When I generate a Youtube Player by myself using Youtube Player API(instead of using the embed code), I can call call functions on it.

var player;
function onYouTubeIframeAPIReady() {
  player = new YT.Player('player', {
    height: '390',
    width: '640',
    videoId: 'M7lc1UVf-VE',
    events: {
      'onReady': onPlayerReady,
      'onStateChange': onPlayerStateChange
    }
  });
}

//player.playVideo(); will play the video.

My question is, how do I control the player object generated by the embed code? To put it in another way, from page http://www.youtube.com/watch?v=M7lc1UVf-VE, how do I play the video by calling SOMEPlayer.playVideo()? When you go to the url, ytplayer object is available, but it doesn't seem to contain the necessary functions.

This question might be a duplicate of this.

回答1:

This can be done like the following.

Given a general YouTube embed source code:

<iframe width="560" height="315" src="//www.youtube.com/embed/M7lc1UVf-VE" frameborder="0" allowfullscreen></iframe>

a. Add a enablejsapi parameter and set it true

index.html

<iframe width="560" height="315" src="//www.youtube.com/embed/M7lc1UVf-VE" frameborder="0" enablejsapi="1" allowfullscreen></iframe>

b. Give it a unique id

<iframe id="youtube-video" width="560" height="315" src="//www.youtube.com/embed/M7lc1UVf-VE" frameborder="0" enablejsapi="1" allowfullscreen></iframe>

c. Load iFrame API and create a player that references the existing iFrame

application.js

var tag = document.createElement('script');
tag.src = "https://www.youtube.com/iframe_api";
var firstScriptTag = document.getElementsByTagName('script')[0];
firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);

var player;
function onYouTubeIframeAPIReady() {
  player = new YT.Player('youtube-video', {
    events: {
      'onReady': onPlayerReady,
      'onStateChange': onPlayerStateChange
    }
  });
}

function onPlayerReady() {
  console.log("hey Im ready");
  //do whatever you want here. Like, player.playVideo();

}

function onPlayerStateChange() {
  console.log("my state changed");
}

回答2:

var player = YT.get('id-of-youtube-iframe');

回答3:

Maximus S gave a perfectly correct answer. The official YouTube IFrame Player API docs suggest initialising the player through a unique id of an iframe with the video as var yPlayer = new YT.Player('unique-id');.

For the future readers of this question looking for a way to generate a YouTube Player from a reference to an iframe element without id (as myself), it is possible to do so by running var yPlayer = new YT.Player(iframeElement); if you add type="text/html" attribute to the iframe element and set enablejsapi=1 parameter in the src attribute:

<iframe type="text/html" height="360" width="640" src="https://www.youtube.com/embed/jNQXAC9IVRw?enablejsapi=1"></iframe>

Full snippet

回答4:

A great way to do this without loading the IFrame API in the parent window is to grab the object from the IFrame

var ytplayer_window = document.getElementById("playerIFrame").contentWindow;
var player = ytplayer_window.yt.player.getPlayerByElement(ytplayer_window.player);

回答5:

The best answer is almost right. You have to place "enablejsapi=1" on the iframe src. Something like:

<iframe id="youtube-video" width="560" height="315" 
        src="https://www.youtube.com/embed/M7lc1UVf-VE?enablejsapi=1" frameborder="0" 
        allowfullscreen>
</iframe>