vue+photoswipe

之前pc端时候，点击图片放大功能封装了一个插件。思路是这样的，点击图片时候，获取图片地址，然后获取真实图片的大小，判断下屏幕大小，如果图片大小大于屏幕大小，则图片宽度设为和屏幕宽度一样。如果小于屏幕宽度，则屏幕宽度减去弹出图片的宽度，再除以2居中对齐。高度也是类似。大致思想如此。到手机端时候，需求说每个组里的图片不但能放大，放大后还能左右翻转。好吧，找个插件吧，于是开始了vue+photoswip

qq274501366

6887人浏览 · 2017-11-24 20:39:00

qq274501366 · 2017-11-24 20:39:00 发布

好了，废话不多说了

首先引入photoswipe.js和photoswipe-ui-default.min.js 和那段html(<div class="pswp" tabindex="-1" role="dialog" aria-hidden="true">),这里我是以组件的形式引入的。代码如下

var enlarge = Vue.extend({
    template: '<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--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>'})

引进这个js文件，并注册。

引入initPhotoSwipeFromDOM这个方法

var initPhotoSwipeFromDOM = function (gallerySelector) {
    // 解析来自DOM元素幻灯片数据（URL，标题，大小...）
    // (children of gallerySelector)
    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) {
                // <figcaption> content
                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;

        // find root element of slide
        var clickedListItem = closest(eTarget, function (el) {
            return (el.tagName && el.tagName.toUpperCase() === 'FIGURE');
        });

        if (!clickedListItem) {
            return;
        }

        // find index of clicked item by looping through all child nodes
        // alternatively, you may define index via data- attribute
        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) {
            // open PhotoSwipe if valid index found
            openPhotoSwipe(index, clickedGallery);
        }
        return false;
    };

    // parse picture index and gallery index from URL (#&pid=1&gid=2)
    var photoswipeParseHash = function () {
        var hash = window.location.hash.substring(1),
                params = {};
        //console.log("222"+hash);
        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}
            ],
            // define gallery index (for URL)
            galleryUID: galleryElement.getAttribute('data-pswp-uid'),
            getThumbBoundsFn: function (index) {
                // See Options -> getThumbBoundsFn section of documentation for more info
                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};
            }

        };

        // PhotoSwipe opened from URL
        if (fromURL) {
            if (options.galleryPIDs) {
                // parse real index when custom PIDs are used 
                for (var j = 0; j < items.length; j++) {
                    if (items[j].pid == index) {
                        options.index = j;
                        break;
                    }
                }
            } else {
                // in URL indexes start from 1
                options.index = parseInt(index, 10) - 1;
            }
        } else {
            options.index = parseInt(index, 10);
        }

        // exit if index not found
        if (isNaN(options.index)) {
            return;
        }

        if (disableAnimation) {
            options.showAnimationDuration = 0;
        }

        // Pass data to PhotoSwipe and initialize it
        gallery = new PhotoSwipe(pswpElement, PhotoSwipeUI_Default, items, options);
        gallery.init();
    };

    // loop through all gallery elements and bind events
    //alert(33);
    var galleryElements = document.querySelectorAll(gallerySelector);
    //console.log(galleryElements);
    for (var i = 0, l = galleryElements.length; i < l; i++) {
        galleryElements[i].setAttribute('data-pswp-uid', i + 1);
        galleryElements[i].onclick = onThumbnailsClick;
    }

    // Parse URL and open gallery if it contains #&pid=3&gid=1
    var hashData = photoswipeParseHash();
    //console.log(hashData);
    if (hashData.pid && hashData.gid) {
        openPhotoSwipe(hashData.pid, galleryElements[ hashData.gid - 1 ], true, true);
    }
};

// execute above function
//console.log($(".my-gallery").length);
initPhotoSwipeFromDOM('.my-gallery');

html中加入

<div class="my-gallery">
                        <figure>
                            <div><a href="http://img.fwxgx.com/uploads/2017/10/15083006520349_24464577.jpg" data-size="500x500"><img style="width: 90%;" src="http://img.fwxgx.com/uploads/2017/10/15083006520349_24464577.jpg"></a></div>
                        </figure>
                        <figure>
                            <div><a href="http://img.fwxgx.com/uploads/2017/10/15083006520349_24464577.jpg" data-size="500x500"><img style="width: 90%;" src="http://img.fwxgx.com/uploads/2017/10/15083006520349_24464577.jpg"></a></div>
                        </figure>
                    </div>

然后打开文件，图片可以放大。你以为这样就玩了吗？然后我把此处放到循环中

var commentList = Vue.extend({
    template: '<ul class="commentlist">' +
            '<li class="commentlistli" v-for="comlist in comment.list">' +
            '<div class="left wb20"><a class="commenthead"><img :src="jointhead(comlist.avatar)"></a></div>' +
            '<div class="right wb78">' +
            '<p><a class="commentname">{{comlist.user_name}}</a></p>' +
            '<span class="comment" v-html="htmlspecialchars_decode(comlist.comment)"></span>' +
            '<div class="my-gallery" data-pswp-uid="3">' +
            '<figure>' +
            '<div><a href="http://img.fwxgx.com/uploads/2017/10/15083006520349_24464577.jpg" data-size="500x500"><img style="width: 30%;" src="http://img.fwxgx.com/uploads/2017/10/15083006520349_24464577.jpg"></a></div>' +
            '</figure>' +
            '</div>' +
            '</div>' +
            '<div class="clear"></div>' +
            '</li>' +
            '</ul>',
    props: ['comment'],
    methods: {
        jointhead: function (str) {
            if (str.indexOf('http') < 0) {
                return "/" + str;
            } else {
                return str;
            }
        },
        htmlspecialchars_decode: function (str) {
            str = str.replace(/&/g, '&');
            str = str.replace(/</g, '<');
            str = str.replace(/>/g, '>');
            str = str.replace(/"/g, '"');
            str = str.replace(/'/g, '"');
            str = str.replace(/width="40"/g, '');
            str = str.replace(/width=40/g, '');
            str = str.replace(/height="40"/g, '');
            str = str.replace(/height=40/g, '');
            str = str.replace(/width="50"/g, '');
            str = str.replace(/width=50/g, '');
            str = str.replace(/height="50"/g, '');
            str = str.replace(/height=50/g, '');
            return str;
        },
    },
    
})

图片不能放大了！！！

这是为什么呢？因为调用

initPhotoSwipeFromDOM('.my-gallery');的时候还没有加载完成。

根据vue的执行过程发现有个updated方法，updated的作用是在data发生变化渲染更新视图之后触发。

于是上面的代码加了一个updated

var commentList = Vue.extend({
    template: '<ul class="commentlist">' +
            '<li class="commentlistli" v-for="comlist in comment.list">' +
            '<div class="left wb20"><a class="commenthead"><img :src="jointhead(comlist.avatar)"></a></div>' +
            '<div class="right wb78">' +
            '<p><a class="commentname">{{comlist.user_name}}</a></p>' +
            '<span class="comment" v-html="htmlspecialchars_decode(comlist.comment)"></span>' +
            '<div class="my-gallery" data-pswp-uid="3">' +
            '<figure>' +
            '<div><a href="http://img.fwxgx.com/uploads/2017/10/15083006520349_24464577.jpg" data-size="500x500"><img style="width: 30%;" src="http://img.fwxgx.com/uploads/2017/10/15083006520349_24464577.jpg"></a></div>' +
            '</figure>' +
            '</div>' +
            '</div>' +
            '<div class="clear"></div>' +
            '</li>' +
            '</ul>',
    props: ['comment'],
    methods: {
        jointhead: function (str) {
            if (str.indexOf('http') < 0) {
                return "/" + str;
            } else {
                return str;
            }
        },
        htmlspecialchars_decode: function (str) {
            str = str.replace(/&/g, '&');
            str = str.replace(/</g, '<');
            str = str.replace(/>/g, '>');
            str = str.replace(/"/g, '"');
            str = str.replace(/'/g, '"');
            str = str.replace(/width="40"/g, '');
            str = str.replace(/width=40/g, '');
            str = str.replace(/height="40"/g, '');
            str = str.replace(/height=40/g, '');
            str = str.replace(/width="50"/g, '');
            str = str.replace(/width=50/g, '');
            str = str.replace(/height="50"/g, '');
            str = str.replace(/height=50/g, '');
            return str;
        },
    },
    updated: function () {
        initPhotoSwipeFromDOM('.my-gallery');
    },
})

再打开果然通过。

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