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我正在使用 HTML5video元素开发自定义视频播放器，但无法让全屏按钮与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requestFullscreen使用用户手势发起呼叫……除非我误解了用户手势的构成。单击元素是一种用户手势，不是吗？

我意识到关于 SO 上的全屏 API 存在很多问题，但看起来很多人希望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？

这个代码有一支笔，但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>

4

2 回答 2

1

问题是toggleFullScreen当我单击全屏按钮时，我的函数被调用了两次。我在回复 Bibek Khadka 的回答时看到了它。第一次是我单击按钮时，第二次是由于这些事件侦听器而实际更改了全屏模式...

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

它会进入全屏模式，然后快速返回，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;
}

...然后我不使用它来处理按钮的点击。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，但它现在解决了问题。我之前尝试过使用:fullscreen伪类，但遇到了一些困难，我切换到了更熟悉的切换类和变量的方法。我需要再看一看。

于 2017-01-25T09:25:39.843 回答
0

我不是专家......只是有空闲时间的人:)

你const player = document.querySelector('.player');是一个元素，并试图player.requestFullscreen();给你错误。修改您的代码，使 api 调用由类似player.onclick().requestFullscreen();可能的东西发出。对不起，如果我没有那么有帮助。

于 2017-01-25T04:59:21.427 回答