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移动端图片放大滑动查看-插件photoswipe的使用

2024-10-14 10:40:02   213人阅读

最近在开发项目的时候，遇到一个需求，需要移动端实现放大查看图片的功能，然后我就在网上搜索了一下资料，看到了photoswipe这个插件，后来试了试，确实挺好用的，它可以实现手势放大缩小查看图片，左右滑动切换图片以及上下滑动关闭大图。现在简单分享一下。

一、需要引入的css和js文件、

　　页面中需要引入如下文件：photoswipe.css，default-skin.css，photoswipe.js，photoswipe-ui-default.min.js

　　首先可以到它的官网或者github网站上下载插件，就可以找到需要的资源，官网地址：http://photoswipe.com；GitHub网址：https://github.com/dimsemenov/PhotoSwip

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二、html页面中需要添加如下部分html代码

该段代码用于显示大图功能

<div class="pswp" tabindex="-1" role="dialog" aria-hidden="true">
        <div class="pswp__bg"></div>
        <div class="pswp__scroll-wrap">
            <div class="pswp__container">
                <div class="pswp__item"></div>
                <div class="pswp__item"></div>
                <div class="pswp__item"></div>
            </div>
            <div class="pswp__ui pswp__ui--hidden">
                <div class="pswp__top-bar">
                    <div class="pswp__counter"></div>
                    <button class="pswp__button pswp__button--close" title="Close (Esc)"></button>
                    <!--<button class="pswp__button pswp__button&#45;&#45;share" title="Share"></button>-->
                    <button class="pswp__button pswp__button--fs" title="Toggle fullscreen"></button>
                    <button class="pswp__button pswp__button--zoom" title="Zoom in/out"></button>
                    <div class="pswp__preloader">
                        <div class="pswp__preloader__icn">
                            <div class="pswp__preloader__cut">
                                <div class="pswp__preloader__donut"></div>
                            </div>
                        </div>
                    </div>
                </div>
                <div class="pswp__share-modal pswp__share-modal--hidden pswp__single-tap">
                    <div class="pswp__share-tooltip"></div>
                </div>
                <button class="pswp__button pswp__button--arrow--left" title="Previous (arrow left)">
                </button>
                <button class="pswp__button pswp__button--arrow--right" title="Next (arrow right)">
                </button>
                <div class="pswp__caption">
                    <div class="pswp__caption__center"></div>
                </div>
            </div>
        </div>
    </div>

放置图片部分的html代码按照如下结构：

<div class="my-gallery" data-pswp-uid="1">
     <figure>
         <div class="img-dv"><a href="img/img1-big.jpg" data-size="1920x1080"><img src="img/img1.jpg"></a></div>
         <figcaption style="display:none;">在这里可增加图片描述</figcaption>
     </figure>
</div>

 

三、完整代码

以下是完整代码

<!doctype html>
<html>
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">
    <meta name="apple-mobile-web-app-capable" content="yes">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title>photoswipe的使用</title>
    <link rel="stylesheet prefetch" href="css/photoswipe.css">
    <link rel="stylesheet prefetch" href="css/default-skin/default-skin.css">
    <style>
        * {margin: 0;padding: 0;}
        .clearfix::before, .clearfix::after {
            display: block;
            content: ‘‘;
            visibility: hidden;
            height: 100%;
            clear: both;
        }
        body {padding-top: 2%;}
        .my-gallery {width:96%;margin: 0 auto;}
        .my-gallery .img-dv {width:100%;margin-bottom: 1%;}
        .my-gallery .img-dv a {display:block;width:100%;text-align: center}
        .my-gallery .img-dv a img {width:100%;}
    </style>
</head>

<body>
    <!--如果有多个data-pswp-uid 它的值是不能重复的-->
    <div class="my-gallery" data-pswp-uid="1">
        <figure>
            <div class="img-dv"><a href="img/img1-big.jpg" data-size="1920x1080"><img src="img/img1.jpg"></a></div>
            <figcaption style="display:none;">在这里可增加图片描述</figcaption>
        </figure>
        <figure>
            <div class="img-dv"><a href="img/img2-big.jpg" data-size="1920x1080"><img src="img/img2.jpg"></a></div>
            <figcaption style="display:none;">在这里可增加图片描述2</figcaption>
        </figure>
        <figure>
            <div class="img-dv"><a href="img/img3-big.jpg" data-size="1920x1080"><img src="img/img3.jpg"></a></div>
            <figcaption style="display:none;">在这里可增加图片描述3</figcaption>
        </figure>
        <figure>
            <div class="img-dv"><a href="img/img4-big.jpg" data-size="1920x1080"><img src="img/img4.jpg"></a></div>
            <figcaption style="display:none;">在这里可增加图片描述4</figcaption>
        </figure>
        <figure>
            <div class="img-dv"><a href="img/img5-big.jpg" data-size="1920x1080"><img src="img/img5.jpg"></a></div>
            <figcaption style="display:none;">在这里可增加图片描述5在这里可增加图片描述5在这里可增加图片描述5</figcaption>
        </figure>
    </div>

    <div class="pswp" tabindex="-1" role="dialog" aria-hidden="true">
        <div class="pswp__bg"></div>
        <div class="pswp__scroll-wrap">
            <div class="pswp__container">
                <div class="pswp__item"></div>
                <div class="pswp__item"></div>
                <div class="pswp__item"></div>
            </div>
            <div class="pswp__ui pswp__ui--hidden">
                <div class="pswp__top-bar">
                    <div class="pswp__counter"></div>
                    <button class="pswp__button pswp__button--close" title="Close (Esc)"></button>
                    <!--<button class="pswp__button pswp__button&#45;&#45;share" title="Share"></button>-->
                    <button class="pswp__button pswp__button--fs" title="Toggle fullscreen"></button>
                    <button class="pswp__button pswp__button--zoom" title="Zoom in/out"></button>
                    <div class="pswp__preloader">
                        <div class="pswp__preloader__icn">
                            <div class="pswp__preloader__cut">
                                <div class="pswp__preloader__donut"></div>
                            </div>
                        </div>
                    </div>
                </div>
                <div class="pswp__share-modal pswp__share-modal--hidden pswp__single-tap">
                    <div class="pswp__share-tooltip"></div>
                </div>
                <button class="pswp__button pswp__button--arrow--left" title="Previous (arrow left)">
                </button>
                <button class="pswp__button pswp__button--arrow--right" title="Next (arrow right)">
                </button>
                <div class="pswp__caption">
                    <div class="pswp__caption__center"></div>
                </div>
            </div>
        </div>
    </div>
</body>
<script src="js/photoswipe.js"></script>
<script src="js/photoswipe-ui-default.min.js"></script>
<script type="text/javascript">
    var initPhotoSwipeFromDOM = function(gallerySelector) {
        // 解析来自DOM元素幻灯片数据（URL，标题，大小...）
        var parseThumbnailElements = function(el) {
            var thumbElements = el.childNodes,
                numNodes = thumbElements.length,
                items = [],
                figureEl,
                linkEl,
                size,
                item,
                divEl;
            for(var i = 0; i < numNodes; i++) {
                figureEl = thumbElements[i]; // <figure> element
                // 仅包括元素节点
                if(figureEl.nodeType !== 1) {
                    continue;
                }
                divEl = figureEl.children[0];
                linkEl = divEl.children[0]; // <a> element
                size = linkEl.getAttribute(‘data-size‘).split(‘x‘);
                // 创建幻灯片对象
                item = {
                    src: linkEl.getAttribute(‘href‘),
                    w: parseInt(size[0], 10),
                    h: parseInt(size[1], 10)
                };
                if(figureEl.children.length > 1) {
                    item.title = figureEl.children[1].innerHTML;
                }
                if(linkEl.children.length > 0) {
                    // <img> 缩略图节点, 检索缩略图网址
                    item.msrc = linkEl.children[0].getAttribute(‘src‘);
                }
                item.el = figureEl; // 保存链接元素 for getThumbBoundsFn
                items.push(item);
            }
            return items;
        };

        // 查找最近的父节点
        var closest = function closest(el, fn) {
            return el && ( fn(el) ? el : closest(el.parentNode, fn) );
        };

        // 当用户点击缩略图触发
        var onThumbnailsClick = function(e) {
            e = e || window.event;
            e.preventDefault ? e.preventDefault() : e.returnValue = false;
            var eTarget = e.target || e.srcElement;
            var clickedListItem = closest(eTarget, function(el) {
                return (el.tagName && el.tagName.toUpperCase() === ‘FIGURE‘);
            });
            if(!clickedListItem) {
                return;
            }
            var clickedGallery = clickedListItem.parentNode,
                childNodes = clickedListItem.parentNode.childNodes,
                numChildNodes = childNodes.length,
                nodeIndex = 0,
                index;
            for (var i = 0; i < numChildNodes; i++) {
                if(childNodes[i].nodeType !== 1) {
                    continue;
                }
                if(childNodes[i] === clickedListItem) {
                    index = nodeIndex;
                    break;
                }
                nodeIndex++;
            }
            if(index >= 0) {
                openPhotoSwipe( index, clickedGallery );
            }
            return false;
        };

        var photoswipeParseHash = function() {
            var hash = window.location.hash.substring(1),
                params = {};
            if(hash.length < 5) {
                return params;
            }
            var vars = hash.split(‘&‘);
            for (var i = 0; i < vars.length; i++) {
                if(!vars[i]) {
                    continue;
                }
                var pair = vars[i].split(‘=‘);
                if(pair.length < 2) {
                    continue;
                }
                params[pair[0]] = pair[1];
            }
            if(params.gid) {
                params.gid = parseInt(params.gid, 10);
            }
            return params;
        };

        var openPhotoSwipe = function(index, galleryElement, disableAnimation, fromURL) {
            var pswpElement = document.querySelectorAll(‘.pswp‘)[0],
                gallery,
                options,
                items;
            items = parseThumbnailElements(galleryElement);
            // 这里可以定义参数
            options = {
                barsSize: {
                    top: 100,
                    bottom: 100
                },
                fullscreenEl : false,
                shareButtons: [
                    {id:‘wechat‘, label:‘分享微信‘, url:‘#‘},
                    {id:‘weibo‘, label:‘新浪微博‘, url:‘#‘},
                    {id:‘download‘, label:‘保存图片‘, url:‘{{raw_image_url}}‘, download:true}
                ],
                galleryUID: galleryElement.getAttribute(‘data-pswp-uid‘),
                getThumbBoundsFn: function(index) {
                    var thumbnail = items[index].el.getElementsByTagName(‘img‘)[0], // find thumbnail
                        pageYScroll = window.pageYOffset || document.documentElement.scrollTop,
                        rect = thumbnail.getBoundingClientRect();
                    return {x:rect.left, y:rect.top + pageYScroll, w:rect.width};
                }
            };
            if(fromURL) {
                if(options.galleryPIDs) {
                    for(var j = 0; j < items.length; j++) {
                        if(items[j].pid == index) {
                            options.index = j;
                            break;
                        }
                    }
                } else {
                    options.index = parseInt(index, 10) - 1;
                }
            } else {
                options.index = parseInt(index, 10);
            }
            if( isNaN(options.index) ) {
                return;
            }
            if(disableAnimation) {
                options.showAnimationDuration = 0;
            }
            gallery = new PhotoSwipe( pswpElement, PhotoSwipeUI_Default, items, options);
            gallery.init();
        };

        var galleryElements = document.querySelectorAll( gallerySelector );
        for(var i = 0, l = galleryElements.length; i < l; i++) {
            galleryElements[i].setAttribute(‘data-pswp-uid‘, i+1);
            galleryElements[i].onclick = onThumbnailsClick;
        }
        var hashData = photoswipeParseHash();
        if(hashData.pid && hashData.gid) {
            openPhotoSwipe( hashData.pid ,  galleryElements[ hashData.gid - 1 ], true, true );
        }
    };

    initPhotoSwipeFromDOM(‘.my-gallery‘);
</script>
</html>

 

四、页面效果图

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移动端图片放大滑动查看-插件photoswipe的使用


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