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;
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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