使用YouTube Player API将视频添加到页面

debugcn 发表于 Dev

雷吉

我想使用Player API在单击按钮时加载YouTube视频。目的是用户可以输入视频网址，单击按钮，然后在下面加载视频（我将下面的表单输入排除在外，以使其更加简单）。

我尝试过使用location.reload();来强制重新加载页面，并检查了一些其他类似的问题，因为它们不使用API（添加功能后需要在以后使用），因此这些问题并不完全有用。

来自文档的此示例工作正常：

<!DOCTYPE html>
<html>
<body>

<!-- 1. The <iframe> (and video player) will replace this <div> tag. -->
<div id="player"></div>

<script>
    // 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();
    }
</script>
</body>
</html>

我想让类似这样的东西（非常相似的版本）工作。我不知道为什么现在不行。

<!DOCTYPE html>
<html>
<body>

<input type="submit" value="Submit" id="submit">

<!-- 1. The <iframe> (and video player) will replace this <div> tag. -->
<div id="player"></div>

<script>

    document.getElementById("submit").addEventListener("click", function() {

        location.reload();

        // 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();
        }

    });

</script>
</body>
</html>

准瓦尔

你有两个问题。

1）onYouTubeIframeAPIReady永远不会被调用，因为它是在youtube API加载后定义的。您可以通过添加看到此内容console.log。

2）重新加载页面时，页面将重新加载；即您以前的变量和视频，一切都消失了。

以下是在点击按钮时加载并播放youtube视频的最小示例：

<input type="submit" value="Submit" id="submit">

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

<script src="https://www.youtube.com/iframe_api"></script>
<script>
    document.getElementById('submit').addEventListener('click', () => {
        new YT.Player('player', {
            height: '390',
            width: '640',
            videoId: 'M7lc1UVf-VE',
            events: {
                onReady: e => e.target.playVideo()
            }
        });
    });
</script>

请注意，YouTube代码示例要么试图向后兼容，要么就没有进行严格的更新。他们不遵循现代风格（例如，他们使用var代替let，==代替===，"代替'，等等。