Question

我正在尝试将Youtube Iframe API实现到我的Rails应用中。我试图复制Youtube Iframe API instructions page上的确切示例。

创建了一个yt_player.js文件：

$(function() {

   alert('this gets called')

   // 2. This code loads the IFrame Player API code asynchronously.
      var tag = document.createElement('script');

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

  // 3. This function creates an <iframe> (and YouTube player)
  //    after the API code downloads.
  var player;
  function onYouTubeIframeAPIReady() {
    alert('this does not get called')
    player = new YT.Player('player-wrapper', {
      height: '390',
      width: '640',
      videoId: 'M7lc1UVf-VE',
      events: {
        'onReady': onPlayerReady,
        'onStateChange': onPlayerStateChange
      }
    });
  }
  // 4. The API will call this function when the video player is ready.
  function onPlayerReady(event) {
    event.target.playVideo();
  }

  // 5. The API calls this function when the player's state changes.
  //    The function indicates that when playing a video (state=1),
  //    the player should play for six seconds and then stop.
  var done = false;
  function onPlayerStateChange(event) {
    if (event.data == YT.PlayerState.PLAYING && !done) {
      setTimeout(stopVideo, 6000);
      done = true;
    }
  }
  function stopVideo() {
    player.stopVideo();
  }
});

我的观点：

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

我希望这可以工作但是没有加载视频。控制台中没有显示错误。

我做错了什么？

Answer 1

首先，当您在浏览器控制台中办理登机手续时，我非常确定您的window.player和window.onYouTubeIframeAPIReady是undefined。

原因是youtube iframe api的工作方式，必须全局定义上述变量。

请检查此document

他们说：

onYouTubeIframeAPIReady函数将在播放器API代码下载后立即执行。代码的这一部分定义了一个全局变量，player，它指向您正在嵌入的视频播放器，然后该函数构造视频播放器对象。

所以更改将是:(全局定义youtube变量和回调）

// Your current code
window.player = null; // <-- change here
window.onYouTubeIframeAPIReady = function() {  // <-- change here
  alert('this does not get called')
  player = new YT.Player('player-wrapper', {
    height: '390',
    width: '640',
    videoId: 'M7lc1UVf-VE',
    events: {
      'onReady': onPlayerReady,
      'onStateChange': onPlayerStateChange
    }
  });
}

window.onPlayerReady = function(event) {  // <-- change here
  event.target.playVideo();
}

window.done = false;  // <-- change here
window.onPlayerStateChange = function(event) {  // <-- change here
  if (event.data == YT.PlayerState.PLAYING && !done) {
    setTimeout(stopVideo, 6000);
    done = true;
  }
}
window.stopVideo = function() {  // <-- change here
  player.stopVideo();
}

Rails＆amp; Youtube API：加载iframe的问题

1 个答案: