jquery - 带有视频元素的基于 Web 的全屏幻灯片

Question

我想开发基于 HTML 5 的幻灯片，其中包含全屏图像和视频。当几分钟没有用户活动时，这将是我们的一个信息亭上的某种屏幕保护程序。我们已经在全屏上实现了基于图像的幻灯片，所以这没有问题，但是现在我们还想添加视频自动播放功能，例如让我们说这是屏幕保护程序内容的顺序

图像.jpeg
image2.jpeg
视频剪辑.mp4
image3.jpeg
其他视频.mp4

在 jquery 脚本运行后，我们希望连续运行这些文件并显示图像几秒钟或自动启动视频并在播放视频完成后移至下一张幻灯片

有人可以建议如何做到这一点，如果有任何已经实现的 jQuery 插件，你可以提供链接吗？

score 9 · Accepted Answer

其实这很容易解决。在 JavaScript 的注释中找到所有解释。将所有内容都包裹在一个封闭中$(document).ready(function () {});，您就可以开始了。

HTML

<div id="canvas" class="canvas"></div>

CSS

div.canvas {
    display:           table-cell;
    width:             1280px;
    height:            800px;
    background:        black;
    vertical-align:    middle;
}

div.canvas > video {
    display:           block;
    margin:            auto;
}

div.canvas > img {
    display:           block;
    margin:            auto;
}

JavaScript - 变量

// array containing links to the content
var content = ['movie_1.m4v', 'movie_2.m4v', 'image_1.jpg', 'image_2.jpg'];
// element where anything will be played
var canvas = $('#canvas');
// duration an image is shown in ms (milliseconds)
var durationImage = 1000;
// basic source for image and video tag
var srcImage = '<img src="$" alt="">';
var srcVideo = '<video autoplay><source src="$" type="video/mp4"></source></video>';
// current position
var current = -1;
// regex for getting file extension (from http://stackoverflow.com/questions/680929/how-to-extract-extension-from-filename-string-in-javascript)
var regex = /(?:\.([^.]+))?$/;

JavaScript - 函数

// method to play the next content element
function playNext() {
    // increase current element and set it to 0 if end is reached
    ++current;  
    if (content.length == current) {
        current = 0;
    }
    // get file and its extension and check whether it's valid
    var source      = null;
    var file        = content[current];
    var extension   = regex.exec(file)[1];
    if ('jpg' == extension) {
        source      = srcImage;
    }
    if ('m4v' == extension) {
        source      = srcVideo;
    }
    // if source seems valid
    if (null !== source) {
        // replace placeholder with the content and insert content into canvas
        source  = source.replace('$', file);
        canvas.html(source);
        // if content is an image play next after set duration
        if ('jpg' == extension) {
            setTimeout(function() { playNext(); }, durationImage);              
        }
        // if content is a video, bind 'onend' event handler to it, to play next
        if ('m4v' == extension) {
            canvas.find('video').bind("ended", function() {
                playNext();
            });
        }
    }
}

JavaScript - 最后：初始函数调用

// show first (remember current = -1 from above :) )
playNext();

演示

jsfiddle.net 上的演示

关于演示的说明：由于提供的视频格式 ( video/quicktime )，演示仅在 Safari 中运行（也可能在 IE9 中运行）。

score 3 · Accepted Answer

首先，我将从给您这个LINK开始。在这里你可以找到很多关于视频事件的有用信息（比如：结束、加载、播放等）。

此外，这里是小提琴/演示的链接（在 Chrome 上测试）。

This is the html structure:

<section class="slideshow">
    <ul>
         <img src="" class="loader" />
         <div class="pause"></div>
         <li>img/video</li>
         <li>img/video</li>
         <li>img/video</li>
         <li>img/video</li>
         <li>img/video</li>
    </ul>
</section>

We have a simple <section> which contains all of our images and video. I've also added a GIF loader to show that we are loading something at the beginning (there is no need to see the pictures loading slowly), and a Pause button.

The Css to set all the elements and their size:

.slideshow {
    width: 700px;
    height: 300px;
    background: #efefef;
    position: relative;
    background: white;
    box-shadow: 0px 0px 5px black;
    margin: 20px auto;
}

.slideshow ul {
    width: 100%;
    height: 100%;
    position: relative;
    list-style: none;
    overflow: hidden;
    display: none;
}

.slideshow ul li {
    position: absolute;
    left: 100%;
}

.slideshow ul li:first-child {
    left: 0%;
}

video {
    background: #434343;
}

.loader {
    width: 50px;
    height: 50px;
    position: absolute;
    left: 50%;
    top: 50%;
    margin-left: -25px;
    margin-top: -25px;
}

.pause {
    display: none;
    width: 50px;
    height: 50px;
    position: absolute;
    top: 50%;
    left: 50%;
    margin-left: -25px;
    margin-top: -25px;
    border-radius: 50%;
    background: rgba(0,0,0,.6);
    z-index: 100;
    line-height: 50px;
    text-align: center;
    font-size: 1.0em;
    font-weight: bold;
    color: white;
    cursor: pointer;
}

And finally the Javascript/jQuery part:

// Some variables
var timer;
var sWidth = 400, sHeight = 200, border = 10;
var slideshowSet = false;
var video;
var videoSet = false;
var slidePause = false;
var $el;
var $currentEl = $('.slideshow').find('li').eq(0);

// On document ready
$(function() {
    // Set slideshow dimensions + border
    setSlideDimensions(sWidth, sHeight, border);

    // Show pause button
    $('.slideshow').hover(
        function(){
            if(slideshowSet) {
                $('.pause').stop().fadeIn(200);
            }
        },
        function() {
            if(slideshowSet) {
                $('.pause').fadeOut(200);
            }
        }
    );

    // Pause button
    $('.pause').click(function() {
         if($(this).text() == '| |') {
            // Pause slideshow
            slidePause = true;
            $(this).text('►');
            clearTimeout(timer);
            if($currentEl.find('video').size() == 1){
                video.pause();
            }
        } else {
            // Play slideshow
            $(this).text('| |');
            if($currentEl.find('video').size() == 1){
                video.play();
            } else {
                timer = setTimeout(slide, 2000);
            }
        }
    });
});

// Window ready (all images loaded, but not videos!!)
$(window).ready(function() {
    // Hide loader GIF
    $('.loader').fadeOut(200);

    // Show slideshow
    $('.slideshow ul').fadeIn(200);

    // Start slideshow
    timer = setTimeout(slide, 2000);
    slideshowSet = true;
});

// Function to slide
function slide() {
    videoSet = false;
    var $el = $('.slideshow').find('li');
    $el.eq(1).add($el.eq(0)).animate({'left': '-='+sWidth}, {queue: false, duration: 300, complete: function() {
        $el.eq(0).animate({'left': '100%'}, 0);
        if($(this).index() == 1){
            $('.slideshow ul').append($el.eq(0));
            $currentEl = $el.eq(1);

            // We chek if it's a video
            if($(this).find('video').size() == 1) {
                //If yes we set the variable
                video = $(this).find('video')[0];
                videoSets();

                // If video can play
                if (video.canPlayType) {
                     // Play video
                     video.play();
                } else {
                     // Error message
                     alert('No html5');
                }
            } else {
                // If not a video we set timeout to next slide
                timer = setTimeout(slide, 2000);
            }
        }
    }});
 }

 // Function to set all video events
 function videoSets(){
     if(!videoSet) {
         videoSet = true;
        // Video ended
        video.addEventListener("ended", function () {
            timer = setTimeout(slide, 2000);
        });

        // Video Playing
        video.addEventListener("playing", function () {
            clearTimeout(timer);
            if(slidePause) {
                $('.pause').text('| |');
                video.play();
                slidePause = false;
            }
        });
    }
}

// Function to set slideshow dimensions
function setSlideDimensions(w, h, b) {
    $('.slideshow').css({width: w, 'height': h, 'padding': b});
    $('.slideshow ul li img, .slideshow ul li video').css({width: w, 'height': h});
}

There is more work to do with the video events. I would preload all videos if possible (not too big) and then start the slideshow so to be sure that there are no "empty moments". If you have too many videos you could start loading the first ones (2/3) and then start the slideshow. By putting the attribute preload to your <video> tag they will start and keep loading once the document is loaded (normally).

Also in your <video> tag you can insert more than one video with all differents formats so that you expand its compatibility cross-browser.

If you have any other question feel free to ask. It may not be perfect as I did this for the first time! ;)

jquery - 带有视频元素的基于 Web 的全屏幻灯片

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