如何混合使用 javascript 和流星以使用 youtube api

Question

我正在尝试实现此处描述的示例 youtube api html 页面：https://developers.google.com/youtube/iframe_api_reference 在流星应用程序中。

我了解到您可以使用 Template.<template name>.rendered 在 meteor 应用程序中实现传统的 javascript 功能。

所以我试图通过将它放入渲染函数中来在 meteor 中实现那个 youtube 示例。

但是不会显示任何视频。

我担心我不了解流星的功能。在 meteor 中甚至可能出现这样的情况吗？

代码：

home.html:

enter code here
    <template name="home">
      <h1> Home</h1>
      This is the home page
      <!-- 1. The <iframe> (and video player) will replace this <div> tag. -->
    <div id="player"></div>
    <script>
    </script>
    </template>

home.js:

Template.home.rendered = function() {
      // 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() {
        player = new YT.Player('player', {
          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();
      }
}

P.s。我知道 adrianliaw:youtube-iframe-api 并且不想使用它。我想更好地了解如何自己实现它。希望这样做能加深我对 javascript 和流星的了解。

Answer 1

我认为这里的问题是在 https://www.youtube.com/iframe_api 加载后，它会尝试调用 onYouTubeIframeAPIReady 函数但找不到它。如果您将函数更改为存储在整个应用程序可用的变量中的匿名函数，则该代码有效。

home.html:

<head>
  <title>test</title>
</head>

<body>
  {{> home}}
</body>

<template name="home">
  <h1> Home</h1>
  This is the home page
  <div id="player"></div>
</template>

home.js:

Template.home.rendered = function() {
      /* 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;
      onYouTubeIframeAPIReady = function() {
        player = new YT.Player('player', {
          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. */
      onPlayerReady = function(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;
      onPlayerStateChange = function(event) {
        if (event.data == YT.PlayerState.PLAYING && !done) {
          setTimeout(stopVideo, 6000);
          done = true;
        }
      };
      stopVideo = function() {
        player.stopVideo();
      };
};

注意函数声明的变化：

function onYouTubeIframeAPIReady() 已更改为 onYouTubeIframeAPIReady = function()
function onPlayerReady(event) 已更改为 onPlayerReady = function(event)
function onPlayerStateChange(event) 已更改为 onPlayerStateChange = function(event)
function stopVideo() 已更改为 stopVideo = function()

这些全局变量现在可由注入的 YouTube 脚本调用。

如何混合使用 javascript 和流星以使用 youtube api

How to mix javascript and meteor to use youtube api

javascript

youtube

meteor