全屏API;浏览器认为我不是以用户手势开始的

Question

我正在使用HTML5 video元素制作自定义视频播放器，我无法使用全屏按钮与Fullscreen API一起使用。

当我单击它时，我收到错误消息：

Failed to execute 'requestFullscreen' on 'Element': API can only be initiated by a user gesture.

但是，我正在用用户手势启动对requestFullscreen的调用...除非我误解了构成用户手势的内容。单击元素是用户手势，不是吗？

我意识到在SO上有很多关于Fullscreen API的问题，但看起来很多人想要在没有用户交互的情况下启动全屏模式。

我究竟做错了什么？

这个代码有一个pen，但是当我找到解决方案时，我可能会改变它。我不会在这里更改代码。

这是代码：

/* Get our elements. */
const player = document.querySelector('.player');
const video = player.querySelector('.viewer');
const progress = player.querySelector('.progress');
const progressBar = player.querySelector('.progress__filled');
const toggle = player.querySelector('.toggle');
const skipButtons = player.querySelectorAll('[data-skip]');
const ranges = player.querySelectorAll('.player__slider');
const fullscreen = player.querySelector('.fullscreen');

let isFullScreen = false;

/* Build our functions */
function togglePlay() {
  const action = video.paused ? 'play' : 'pause';
  video[action]();
}

function updatePlayIcon() {
  toggle.classList.toggle('playing');
}

function skip() {
  video.currentTime += parseFloat(this.dataset.skip);
}

function handleRangeUpdate() {
  video[this.name] = this.value;
}

function handleProgress() {
  const percent = (video.currentTime / video.duration) * 100;
  progressBar.style.flexBasis = percent + '%';
}

function scrub(e) {
  const seconds = (e.offsetX / progress.offsetWidth) * video.duration;
  video.currentTime = seconds;
}

function toggleFullScreen() {
  if (isFullScreen) {
    console.log("exiting fullscreen");

    if (document.exitFullscreen) {
      document.exitFullscreen();
    } else if (document.mozCancelFullScreen) {
      document.mozCancelFullScreen();
    } else if (document.webkitCancelFullScreen) {
      document.webkitCancelFullScreen();
    } else if (document.msExitFullscreen) {
      document.msExitFullscreen();
    }

    console.log('removing fullscreen class');
    player.classList.remove('fullscreen');
  } else {
    console.log("entering fullscreen");

    if (player.requestFullscreen) {
      console.log('requestFullScreen');
      player.requestFullscreen(); // standard
    } else if (player.webkitRequestFullscreen) {
      console.log('webkitRequestFullscreen');
      player.webkitRequestFullscreen(Element.ALLOW_KEYBOARD_INPUT);
    } else if (player.mozRequestFullScreen) {
      console.log('mozRequestFullScreen');
      player.mozRequestFullScreen();
    } else if (player.msRequestFullscreen) {
      console.log('msRequestFullscreen');
      player.msRequestFullscreen();
    } else {
      console.error('Unable to find a fullscreen request method');
    }
    console.log('adding fullscreen class');
    player.classList.add('fullscreen');
  }
  isFullScreen = !isFullScreen;
}

/* Hook up the event listeners */
video.addEventListener('click', togglePlay);
toggle.addEventListener('click', togglePlay);

video.addEventListener('play', updatePlayIcon);
video.addEventListener('pause', updatePlayIcon);
video.addEventListener('timeupdate', handleProgress);

skipButtons.forEach(button => button.addEventListener('click', skip));

ranges.forEach(range => range.addEventListener('change', handleRangeUpdate));
ranges.forEach(range => range.addEventListener('mousemove', handleRangeUpdate));

let mousedown = false;
progress.addEventListener('click', scrub);
progress.addEventListener('mousemove', (e) => mousedown && scrub(e));
progress.addEventListener('mousedown', () => mousedown = true);
progress.addEventListener('mouseup', () => mousedown = false);

fullscreen.addEventListener('click', toggleFullScreen);

document.addEventListener('fullscreenchange', toggleFullScreen);
document.addEventListener('mozfullscreenchange', toggleFullScreen);
document.addEventListener('webkitfullscreenchange', toggleFullScreen);
document.addEventListener('msfullscreenchange', toggleFullScreen);

html {
  box-sizing: border-box;
}

*,
*:before,
*:after {
  box-sizing: inherit;
}

html, body {
  height: 100%;
}

body {
  margin: 0;
  display: flex;
  background: #7A419B;
  background: linear-gradient(135deg, #7c1599 0%, #921099 48%, #7e4ae8 100%);
  background-size: cover;
  align-items: center;
  justify-content: center;
}

.player {
  max-width: 750px;
  max-height: 100%;
  border: 5px solid rgba(0, 0, 0, 0.2);
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.2);
  position: relative;
  font-size: 0;
  overflow: hidden;
}

button.toggle.fullscreen::before {
  font-family: "FontAwesome";
  content: "\f065";
}

.player.fullscreen .player__controls .toggle.fullscreen::before {
  content: "\f066";
}

/* This css is only applied when fullscreen is active. */

.player.fullscreen {
  max-width: none;
  max-height: none;
  width: 100%;
  height: 100%;
  background-color: black;
}

.player.fullscreen video {
  width: 100%;
}

.player__video {
  max-width: 100%;
  max-height: 100%;
}

.player__button {
  background: none;
  border: 0;
  line-height: 1;
  color: white;
  text-align: center;
  outline: 0;
  padding: 0;
  cursor: pointer;
  max-width: 50px;
}

.player__button:focus {
  border-color: #ffc600;
}

.toggle::before {
  font-family: "FontAwesome";
  content: "\f04b";
}

.toggle.playing::before {
  font-family: "FontAwesome";
  content: "\f04c";
}

.player__slider {
  width: 10px;
  height: 30px;
}

.player__controls {
  display: flex;
  position: absolute;
  bottom: 0;
  width: 100%;
  transform: translateY(100%) translateY(-5px);
  transition: all .3s;
  flex-wrap: wrap;
  background: rgba(0, 0, 0, 0.1);
}

.player:hover .player__controls {
  transform: translateY(0);
}

.player:hover .progress {
  height: 15px;
}

.player__controls > * {
  flex: 1;
}

.progress {
  flex: 10;
  position: relative;
  display: flex;
  flex-basis: 100%;
  height: 5px;
  transition: height 0.3s;
  background: rgba(0, 0, 0, 0.5);
  cursor: ew-resize;
}

.progress__filled {
  width: 50%;
  background: #ffc600;
  flex: 0;
  flex-basis: 0%;
}

.player__slider {
  position: relative;
}

.player__slider::after {
  content: attr(name);
  position: absolute;
  top: -2px;
  text-shadow: 1px 1px 1px 0 rgba(0,0,0,0.5);
  font-size: 0.8em;
}
/* unholy css to style input type="range" */

input[type=range] {
  -webkit-appearance: none;
  background: transparent;
  width: 100%;
  margin: 0 5px;
}

input[type=range]:focus {
  outline: none;
}

input[type=range]::-webkit-slider-runnable-track {
  width: 100%;
  height: 8.4px;
  cursor: pointer;
  box-shadow: 1px 1px 1px rgba(0, 0, 0, 0), 0 0 1px rgba(13, 13, 13, 0);
  background: rgba(255, 255, 255, 0.8);
  border-radius: 1.3px;
  border: 0.2px solid rgba(1, 1, 1, 0);
}

input[type=range]::-webkit-slider-thumb {
  box-shadow: 0 0 0 rgba(0, 0, 0, 0), 0 0 0 rgba(13, 13, 13, 0);
  height: 15px;
  width: 15px;
  border-radius: 50px;
  background: #ffc600;
  cursor: pointer;
  -webkit-appearance: none;
  margin-top: -3.5px;
  box-shadow: 0 0 2px rgba(0, 0, 0, 0.2);
}

input[type=range]:focus::-wefbkit-slider-runnable-track {
  background: #bada55;
}

input[type=range]::-moz-range-track {
  width: 100%;
  height: 8.4px;
  cursor: pointer;
  box-shadow: 1px 1px 1px rgba(0, 0, 0, 0), 0 0 1px rgba(13, 13, 13, 0);
  background: #ffffff;
  border-radius: 1.3px;
  border: 0.2px solid rgba(1, 1, 1, 0);
}

input[type=range]::-moz-range-thumb {
  box-shadow: 0 0 0 rgba(0, 0, 0, 0), 0 0 0 rgba(13, 13, 13, 0);
  height: 15px;
  width: 15px;
  border-radius: 50px;
  background: #ffc600;
  cursor: pointer;
}

<link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet"/>
<div class="player">
  <video class="player__video viewer" src="https://player.vimeo.com/external/194837908.sd.mp4?s=c350076905b78c67f74d7ee39fdb4fef01d12420&profile_id=164"></video>
  <div class="player__controls">
    <div class="progress">
      <div class="progress__filled"></div>
    </div>
    <button class="player__button toggle" title="Toggle Play"></button>
    <input type="range" name="volume" class="player__slider" min="0" max="1" step="0.05" value="1">
    <input type="range" name="playbackRate" class="player__slider" min="0.5" max="2" step="0.1" value="1">
    <button data-skip="-10" class="player__button"><i class="fa fa-step-backward"></i> 10s</button>
    <button data-skip="25" class="player__button">25s <i class="fa fa-step-forward"></i></button>
    <button class="player__button toggle fullscreen"></button>
  </div>
</div>

Answer 1

问题是，当我点击全屏按钮时，我的toggleFullScreen函数被调用了两次。当我回复Bibek Khadka的回答时，我看到了它。第一次是我点击按钮，第二次是因为这些事件监听器全屏模式实际改变了...

document.addEventListener('fullscreenchange', toggleFullScreen);
document.addEventListener('mozfullscreenchange', toggleFullScreen);
document.addEventListener('webkitfullscreenchange', toggleFullScreen);
document.addEventListener('msfullscreenchange', toggleFullScreen);

它将进入全屏模式，然后返回如此之快以至于我没有看到变化。我相信第二次调用Fullscreen API方法（技术上）没有用户手势，这就是我收到错误消息的原因。

解决方案（至少现在）是创建一个单独的函数来更改类和我用来跟踪我是否处于全屏模式的变量...

function toggleFullScreenClasses() {
  player.classList.toggle('fullscreen');
  isFullScreen = !isFullScreen;
}

...然后我不用它来处理按钮上的点击。我只用它来处理实际的fullscreenchange事件......

document.addEventListener('fullscreenchange', toggleFullScreenClasses);
document.addEventListener('mozfullscreenchange', toggleFullScreenClasses);
document.addEventListener('webkitfullscreenchange', toggleFullScreenClasses);
document.addEventListener('msfullscreenchange', toggleFullScreenClasses);

我知道这很草率，但它现在解决了这个问题。我以前尝试使用:fullscreen伪类，但我遇到了一些困难，我转而采用更熟悉的切换类和变量的方法。我需要再看一下。

Answer 2

我不是专家......只是有空闲时间的人:)

你的const player = document.querySelector('.player');是一个元素，并试图player.requestFullscreen();给你错误。修改你的代码，以便api调用可能来自player.onclick().requestFullscreen();。对不起，如果我没那么有帮助。