当视频播放器不在视野范围内时，将HTML5视频设置为PAUSE [英] Set an HTML5 Video to PAUSE when video player is out of view

问题描述

我想用javascript做这件事。我正在使用Hakim El Hattab的 Reveal.js 作为基础进行演示。

I'd like to do this with javascript. I'm building a presentation using Hakim El Hattab's Reveal.js as a foundation.

Reveal.js的工作方式是你正在查看的当前幻灯片有一个.present类，任何以前的幻灯片都有一个.past类，还有任何幻灯片还没有进入视图有一类.future。

The way Reveal.js works is the current slide you are viewing has a class of .present, any previous slides have a class of .past, and any slides yet to come into view have a class of .future.

我希望它能自动暂停幻灯片组中的任何视频到.past或.future。

I would like it to automatically pause any video that is inside a slide set to .past or .future.

我应该怎么做？

提前致谢！

** * ** * ** * ** * 更新的 * ** * ** * ** * ****

************UPDATE**************

所以感谢我接手了一些方向 css-tricks论坛我能够使用getElementById使用单个视频。

so thanks to some direction i got over on the css-tricks forums i was able to get it working on a single video using getElementById.

下面是我用来添加.past和.future类并同时暂停视频的javascript。

below is the javascript i'm using to add the .past and .future classes and simultaneously pause a video.

if( i < index ) {
    // Any element previous to index is given the 'past' class
    slide.setAttribute('class', 'past');
    document.getElementById('vid').pause();
}
else if( i > index ) {
    // Any element subsequent to index is given the 'future' class
    slide.setAttribute('class', 'future');
    document.getElementById('vid').pause();
}

我现在遇到的问题是如何将其应用于标签名称（即：视频）或可能是一个类。

the issue that i'm having now is how would i apply it to a tag name (ie: video) or possibly a class.

推荐答案

现在你发布了代码，它更容易修复：

Now that you posted your code, it makes it easier to fix:

if( i < index ) {
    // Any element previous to index is given the 'past' class
    slide.setAttribute('class', 'past');
    var vids = document.getElementsByClassName("past");
    for (var i = 0; i < vids.length; i++) {
        vids[i].pause();
    }
}
else if( i > index ) {
    // Any element subsequent to index is given the 'future' class
    slide.setAttribute('class', 'future');
    var vids = document.getElementsByClassName("future");
    for (var i = 0; i < vids.length; i++) {
        vids[i].pause();
    }
}

看看是否有帮助。如果没有，您使用的是符合标准的现代浏览器吗？ getElementsByClassName（）是一个相对较新的功能。它适用于我最新版本的Chrome。

See if that helps. If it doesn't, are you using a modern and standards-compliant browser? getElementsByClassName() is a relatively new feature. It works in the latest version of Chrome for me.

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