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图片点击放大photoswipe

图片点击放大photoswipe

作者: 苏北苝 | 来源:发表于2020-05-27 15:05 被阅读0次

    对比另外一个图片放大插件vue-photo-preview
    photoswipe也是一款图片放大插件,使用之前需要知道PhotoSwipe需要预定义的图像尺寸。
    可以控制多种风格:标题、分享、全屏按钮等,这里只需要放大,完整的查看官网

    二者对比:

    • photoswipe的功能更多,可以分享,全屏,但是photoswipe使用更复杂,需要引入的文件比较多,页面dome也过多,是通过href来实现图片放大。
    • 相对于长图来说,vue-photo-preview的表现形式更好:
    • 如果只适用于图片放大缩小我更倾向于vue-photo-preview;
    对比图

    photoswipe使用:

    • 首先引入需要使用的文件
     <link rel="stylesheet prefetch" href="dist/photoswipe.css">
     <link rel="stylesheet prefetch" href="dist/default-skin/default-skin.css">
     <script src="dist/photoswipeDl.js"></script>
     <script src="dist/photoswipe-ui-default.min.js"></script>
    

    使用:如果有多个图片列表,要设置data-pswp-uid不同的值,顶层类名‘my-gallery’是固定的,图片父级href是图片地址,data-size是需要预定义的图像尺寸。

    <div class="my-gallery clearfix picThree" data-pswp-uid="1">
        <figure class="box">
            <div class="img_dv">
                <div href="Allen.jpg" data-size="500x600">
                    <img src="Allen.jpg">
                </div>
            </div>
        </figure>
        <figure class="box">
            <div class="img_dv">
                <div href="bg.png" data-size="500x600">
                    <img src="bg.png" >
                </div>
            </div>
        </figure>
    </div>
     <!--注意下面千万不要漏掉了:-->
    <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>
                   <!--一些可以操作的图标,这里我只需要放大和缩小,其他的按钮控件就拿掉了-->
                    <button class="pswp__button pswp__button--close" title="Close (Esc)"></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__caption">
                    <div class="pswp__caption__center"></div>
                </div>
            </div>
        </div>
    </div>
    
    • 前面说需要预定义尺寸,如果图片很多的话不可能自己一个赋值,这里用each给其赋值:
    $(function () {
       $('img').each(function () {
         var w = $(this)[0].naturalWidth,
             h = $(this)[0].naturalHeight;
            $(this).attr('data-size', w + 'x' + h);
            $(this).parent().attr('data-size', w + 'x' + h);
        })
     });
    
    • 初始化:
    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) {
                if(!el) {
                    return false;
                }
                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);
                    //修改之后的
                    params = {};
                    window.location.hash = ''
                }
                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,
                    showHideOpacity: true,
                    loop: false,
                    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();
            //修改过后的 这里加了 &&window.location.hash
            if(hashData.pid && hashData.gid) {
                openPhotoSwipe(hashData.pid, galleryElements[hashData.gid - 1], true, true);
            }
        };
        initPhotoSwipeFromDOM('.my-gallery');
    
    • 用在vue中时,由于图片是动态的,所以要在获得图片之后进行初始化,图片尺寸也在img的load事件里获得并赋值:
    <!--html:-->
    <div class="my-gallery clearfix picThree" data-pswp-uid="1">
        <figure class="box" v-for="(img_item,img_index) in imageList">
            <div class="img_dv">
                 <div :href="img_item.url" data-size="500x600">
                     <img :src="img_item.url" @load="getImg($event)" :onerror="melon">
                </div>
            </div>
        </figure>
    </div>
    <!--js:-->
    updated: function() { //初始化photoswipe
       initPhotoSwipeFromDOM('.my-gallery');
    },
     methods: {
       getImg: function(event) {
          var el = event.target;
          var w = $(el)[0].naturalWidth,
              h = $(el)[0].naturalHeight;
        $(el).attr('data-size', w + 'x' + h);
        $(el).parent().attr('data-size', w + 'x' + h);
      },
    }
    
    效果图
    完整代码见github

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          本文标题:图片点击放大photoswipe

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