HTML5 和 Javascript 仅在可见时播放视频

新手上路,请多包涵

我有兴趣设置一个包含多个视频剪辑的 HTML 页面,以便每个视频剪辑仅在可见时播放,然后在看不见时暂停。

我找到 了一个很好的例子,说明如何用一个剪辑实现这一点,但我无法修改代码以处理多个剪辑。也许我需要将此代码转换为函数以便于重用?

这是我到目前为止所拥有的(上面链接的 JS Bin 修改为 2 个剪辑而不是一个)。

此代码似乎仅适用于两个剪辑之一。

 <!DOCTYPE html>
<html>
    <!--   Created using jsbin.com   Source can be edited via http://jsbin.com/ocupor/1/edit
    -->
    <head>
        <meta charset=utf-8 />
        <title>JS Bin</title>
        <style>
            #right {
                position: absolute;
                top: 2000px;
            }
            #video1 {
                position: absolute;
                left: 2000px;
                top: 2000px;
            }
            #video2 {
                position: absolute;
                left: 2000px;
                top: 3000px;
            }

        </style>

        <style id="jsbin-css">
        </style>
    </head>
    #
    <body style="width: 4000px; height: 4000px;">
        <div id="info"></div>
        <div id="down">
            scroll down please...
        </div>
        <div id="right">
            scroll right please...
        </div>
        <video id="video1">
            <source src="http://video-js.zencoder.com/oceans-clip.mp4"/>

        </video>
        <script>
            var video = document.getElementById('video1'), fraction = 0.8;

            function checkScroll() {
                var x = video.offsetLeft, y = video.offsetTop, w = video.offsetWidth, h = video.offsetHeight, r = x + w, //right
                b = y + h, //bottom
                visibleX, visibleY, visible;

                visibleX = Math.max(0, Math.min(w, window.pageXOffset + window.innerWidth - x, r - window.pageXOffset));
                visibleY = Math.max(0, Math.min(h, window.pageYOffset + window.innerHeight - y, b - window.pageYOffset));

                visible = visibleX * visibleY / (w * h);

                if (visible > fraction) {
                    video.play();
                } else {
                    video.pause();
                }
            }

            checkScroll();
            window.addEventListener('scroll', checkScroll, false);
            window.addEventListener('resize', checkScroll, false);
        </script>

        <video id="video2">
            <source src="http://video-js.zencoder.com/oceans-clip.mp4"/>

        </video>
        <script>
            var video = document.getElementById('video2'), fraction = 0.8;

            function checkScroll() {
                var x = video.offsetLeft, y = video.offsetTop, w = video.offsetWidth, h = video.offsetHeight, r = x + w, //right
                b = y + h, //bottom
                visibleX, visibleY, visible;

                visibleX = Math.max(0, Math.min(w, window.pageXOffset + window.innerWidth - x, r - window.pageXOffset));
                visibleY = Math.max(0, Math.min(h, window.pageYOffset + window.innerHeight - y, b - window.pageYOffset));

                visible = visibleX * visibleY / (w * h);

                if (visible > fraction) {
                    video.play();
                } else {
                    video.pause();
                }
            } checkScroll();
            window.addEventListener('scroll', checkScroll, false);
            window.addEventListener('resize', checkScroll, false);

        </script>

    </body>
</html>

原文由 UltrasoundJelly 发布,翻译遵循 CC BY-SA 4.0 许可协议

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2 个回答

使用 isInViewport 插件和 jQuery ,这是我的任务代码

$('video').each(function(){
    if ($(this).is(":in-viewport")) {
        $(this)[0].play();
    } else {
        $(this)[0].pause();
    }
})

原文由 qwazix 发布,翻译遵循 CC BY-SA 3.0 许可协议

好吧,我想,它一定是这样的:

 var videos = document.getElementsByTagName("video");

function checkScroll() {
    var fraction = 0.8; // Play when 80% of the player is visible.

    for(var i = 0; i < videos.length; i++) {

        var video = videos[i];

        var x = video.offsetLeft, y = video.offsetTop, w = video.offsetWidth, h = video.offsetHeight, r = x + w, //right
            b = y + h, //bottom
            visibleX, visibleY, visible;

            visibleX = Math.max(0, Math.min(w, window.pageXOffset + window.innerWidth - x, r - window.pageXOffset));
            visibleY = Math.max(0, Math.min(h, window.pageYOffset + window.innerHeight - y, b - window.pageYOffset));

            visible = visibleX * visibleY / (w * h);

            if (visible > fraction) {
                video.play();
            } else {
                video.pause();
            }

    }

}

window.addEventListener('scroll', checkScroll, false);
window.addEventListener('resize', checkScroll, false);

原文由 saike 发布,翻译遵循 CC BY-SA 4.0 许可协议

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