Youtube iFrame API 'YT is undefined'

问题

I'm trying to put this code in an module function:

$(document).ready(function()
    {
        VIDEO.onYouTubeIframeAPIReady();
}


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

  var player;


   my.onYouTubeIframeAPIReady =function() {
    player = new YT.Player('player', {
      height: '490',
      width: '880',
      videoId: SONG.getArtistId(),
      playerVars: { controls:1, showinfo: 0, rel: 0, showsearch: 0, iv_load_policy: 3 },
      events: {
        'onReady': onPlayerReady,
        'onStateChange': onPlayerStateChange,
        'onError': catchError
      }
    });
  }

  function onPlayerReady(event) {


  if(typeof(SONG.getArtistId()) == undefined)
  {
    console.log("undefineeeed"); 
  } 


    event.target.playVideo();   
  }

  var done = false;
  function onPlayerStateChange(event) {
    if (event.data == YT.PlayerState.PLAYING && !done) {
      // setTimeout(stopVideo, 6000);
      done = true;
    }
    if(event.data == YT.PlayerState.ENDED)
    {
      location.reload();
    }
  }

  function catchError(event)
  {
    if(event.data == 100) console.log("De video bestaat niet meer");
  }

  function stopVideo() {
    player.stopVideo();
  }

  return my;

}(VIDEO || {}, jQuery));

The problem is: even it's self-executing, nothing happens and the iFrame is not shown. I'm trying to do this because it's part of an assignment. We have to work in modules.

回答1:

You need to simplify the code :

HTML

<div id="player"></div>

Javascript

$(document).ready( function() {
  console.log( "ready!" );
  loadPlayer();
});

function getArtistId() {
  return 'l-gQLqv9f4o';
}

function loadPlayer() { 
  if (typeof(YT) == 'undefined' || typeof(YT.Player) == 'undefined') {

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

    window.onYouTubePlayerAPIReady = function() {
      onYouTubePlayer();
    };

  } else {

    onYouTubePlayer();

  }
}

var player;

function onYouTubePlayer() {
  player = new YT.Player('player', {
    height: '490',
    width: '880',
    videoId: getArtistId(),
    playerVars: { controls:1, showinfo: 0, rel: 0, showsearch: 0, iv_load_policy: 3 },
    events: {
      'onStateChange': onPlayerStateChange,
      'onError': catchError
    }
  });
}

  var done = false;
  function onPlayerStateChange(event) {
    if (event.data == YT.PlayerState.PLAYING && !done) {
      // setTimeout(stopVideo, 6000);
      done = true;
    } else if (event.data == YT.PlayerState.ENDED) {
      location.reload();
    }
  }

  function onPlayerReady(event) {

    //if(typeof(SONG.getArtistId()) == undefined)
    //{
    //  console.log("undefineeeed"); 
    //} 
    //event.target.playVideo();   
  }
  function catchError(event)
  {
    if(event.data == 100) console.log("De video bestaat niet meer");
  }

  function stopVideo() {
    player.stopVideo();
  }

And a live example : http://jsbin.com/maweqahuhi/1/ http://jsbin.com/nipogicide/2/

EDIT

Regarding your commentq i made some changement in the code. You need to use onYouTubePlayerAPIReady() to call the player later. I edited all the previous code.

来源：https://stackoverflow.com/questions/28149815/youtube-iframe-api-yt-is-undefined