jQuery 视频播放器的全屏切换无法正确分配类名

Question

我正在开发JavaScript/jQuery视频播放器。它有一个我无法找到原因的错误。

播放器有一个进入/退出全屏按钮(可以在HTML片段的底部看到(：

(function($) {
  /* Helper functions */
  /* 1) full screen */
  function toggleFullScreen(elem) {
    if ((document.fullScreenElement !== undefined && document.fullScreenElement === null) || (document.msFullscreenElement !== undefined && document.msFullscreenElement === null) || (document.mozFullScreen !== undefined && !document.mozFullScreen) || (document.webkitIsFullScreen !== undefined && !document.webkitIsFullScreen)) {
      if (elem.requestFullScreen) {
        elem.requestFullScreen();
      } else if (elem.mozRequestFullScreen) {
        elem.mozRequestFullScreen();
      } else if (elem.webkitRequestFullScreen) {
        elem.webkitRequestFullScreen(Element.ALLOW_KEYBOARD_INPUT);
      } else if (elem.msRequestFullscreen) {
        elem.msRequestFullscreen();
      }
    } else {
      if (document.cancelFullScreen) {
        document.cancelFullScreen();
      } else if (document.mozCancelFullScreen) {
        document.mozCancelFullScreen();
      } else if (document.webkitCancelFullScreen) {
        document.webkitCancelFullScreen();
      } else if (document.msExitFullscreen) {
        document.msExitFullscreen();
      }
    }
  }
  $('video').each(function() {
    var video = $(this)[0],
      videoContainer = video.closest('div'),
      $playToggleBtn = $(videoContainer).find('input[name="play-pause"]'),
      $progressBar = $(videoContainer).find('.progress-bar'),
      $progress = $(videoContainer).find('.progress'),
      $current_time = $(videoContainer).find('.current-time'),
      $durationDisplay = $(videoContainer).find('.duration'),
      $volumeSlider = $(videoContainer).find('.volume-slider'),
      $mute_toggle = $(videoContainer).find('.mute-toggle'),
      $muteBtn = $mute_toggle.find('input[type="checkbox"]'),
      $rate_display = $(videoContainer).find('.rate_display'),
      $fullScreenToggler = $(videoContainer).find('input[name="screen-toggler"]'),
      $playSpeed = $(videoContainer).find('.playback-rate ul li');
    $(document).bind('webkitfullscreenchange mozfullscreenchange fullscreenchange', function(e) {
      var state = document.fullScreen || document.mozFullScreen || document.webkitIsFullScreen;
      var event = state ? 'FullscreenOn' : 'FullscreenOff';
      if (event === 'FullscreenOff') {
        $(videoContainer).removeClass('fullscreen');
        $fullScreenToggler.removeClass('exit');
      } else {
        $(videoContainer).addClass('fullscreen');
        $fullScreenToggler.addClass('exit');
      }
    });
  });
})(jQuery);

<div class="video-container">
  <video poster="posters/poster.jpg">
            <source src="videos/mymovie.mp4" type="video/mp4" />
        </video>
  <div class="controls-wrapper">
    <div class="progress-bar">
      <div class="progress"></div>
    </div>
    <ul class="video-controls">
      <li><input type="button" name="play-pause" value="Play" class="play" /></li>
      <li><a href="#" class="previous">Previous</a></li>
      <li><a href="#" class="next">Next</a></li>
      <li class="mute-toggle unmuted"><input type="checkbox" name="mute" /></li>
      <li><input type="range" min="0" max="1" step="0.01" class="volume-slider" /></li>
      <li><span class="current-time"></span><span>/</span><span class="duration"></span></li>
      <li class="playback-rate">
        <span class="rate_display">Normal</span>
        <div class="piker">
          <ul class="dropdown-content" id="rate_selector">
            <li data-rate="0.5">0.5x</li>
            <li data-rate="0.75">0.75x</li>
            <li data-rate="1">Normal</li>
            <li data-rate="1.125">1.125x</li>
            <li data-rate="1.5">1.5x</li>
            <li data-rate="2">2x</li>
          </ul>
        </div>
      </li>
      <li class="fullscreen-container">
        <input type="button" name="screen-toggler" value="Fullscreen" class="toggle-fullscreen" />
      </li>
    </ul>
  </div>
</div>

问题是：如果我有两个(或更多(视频，即使我点击第一个剪辑的全屏按钮，fullscreen类名也会添加到页面上的所有video-container元素中。

为什么会这样？

更新：

按照 Kaiido 的回答，我使用以下代码解决了这个问题。

$(document).on('fullscreenchange', evt => {
    if ($(document.fullscreenElement).is(videoContainer)) {
        $(document.fullscreenElement).addClass('fullscreen');
        $(videoContainer).removeClass('fullscreen');
        $fullScreenToggler.removeClass('exit');
    } else {
        $(videoContainer).removeClass('fullscreen');
        $fullScreenToggler.addClass('exit');
    }
});

上面提到的问题解决了。然而，我失去了使用 ESC 键作为全屏退出的能力。

更新 2：

我已经在 Github 存储库中推送了播放器。

Answer 1

将

事件绑定到 Document 对象的次数与页面中

堆栈片段不允许全屏，但您正在做的事情的模型是：

$('div').each(function(i, el) {
  $(document).on('click', e => console.log('clicked'));
  console.log('added click event on Document');
})

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div>test</div>
<div>test</div>
<div>test</div>
<div>test</div>
<div>test</div>
<div>test</div>
<div>test</div>
<div>test</div>
<div>test</div>
<div>test</div>
<div>test</div>
<div>test</div>

因此，每次您进入或退出全屏模式时，所有这些事件都会触发，并将在每个视频上设置小牛，无论它是事件起源的视频。

您最好在each迭代器之外添加一个事件处理程序，在那里您可以这样做

$(document).on('fullscreenchange', evt => {
  if($(document.fullscreenElement).is('video')) {
    $(document.fullscreenElement).addClass('fullscreen');
  }
  else {
    $('video.fullscreen').removeClass('fullscreen');
  }
});

但实际上，全屏类的所有内容都是无用的，因为已经有一个由浏览器本机设置的:fullscreen伪类。

Answer 2

据我所知，问题是在"固定"版本中，您将"全屏更改"的单个侦听器附加到文档中。然后在该事件的处理程序中，您将使用在 videos-elements-loop 中定义的元素：

$(videoContainer).removeClass('fullscreen'); $fullScreenToggler.removeClass('exit');/

videoContainer 和 fullScreenToggler 都无法按预期工作。