仿微信朋友圈圖片點選放大效果
這兩天寫了個小專案,其中用到了點選一組圖片中的一張可以檢視它的放大版,用手向左滑動能看到下一張的這組圖片中的第二張的放大版。。。依次類推,單擊放大版的圖片實現關閉效果,對於js能力不太好的我只能找度娘,然後就發現了photoswiper.js,不得不說真的好用,下面我就簡單說下用法。
首先,和使用其他外掛一樣找到必須的資源也就是css,js等必須的檔案,然後引入它們,並且引入自己在專案中肯定會用到的基礎檔案比如jq.和自己寫的css檔案比如style.css這個名字是你自己取的,可隨意,最好結合專案取名。
<link rel="stylesheet" type="text/css" href="css/photoswipe.css">
<link rel="stylesheet prefetch" href="css/default-skin/default-skin.css">
<link rel="stylesheet" type="text/css" href="css/style.css">
<script type="text/javascript" src="js/jquery.min.js"></script>
<script src="js/photoswipe.js"></script>//實際應用時最好引入壓縮版min.js(css同理)
<script src="js/photoswipe-ui-default.min.js"></script>
其次,在需要實現此效果的圖片組外層加入下面這些結構:
<div class="my-gallery" data-pswp-uid="1">
<div>
<a href="images/3.png" data-size="750x980">
<img style="height:100%;" src="images/1.png">
</a>
</div>
<div>
<a href="images/3.png" data-size="750x980">
<img style="height:100%;" src="images/2.png">
</a>
</div>
<div>
<a href="images/3.png" data-size="750x980">
<img style="height:100%;" src="images/3.png">
</a>
</div>
</div>
其實最重要的就是class=”my-gallery” data-pswp-uid=”1”和也是和photoswiper.js產生關聯的鑰匙其中a標籤裡面的data-size是設定展示的放大圖的大小的,而href指向這個圖,一般是原圖。如果你想給展示的放大圖新增附加資訊,你可以在最外層div下再巢狀一層div,當然這個你可以依據設計需求自己改寫頁面結構在style.css中重置default-skin.css或photoswipe.css中的某些樣式或者書寫自己想要的樣式,但是上述的關鍵鑰匙必須存在。
然後,將下面這段程式碼完整的貼上到你的頁面中(這是放大版的結構設定以及一些小元件,比如分享按鈕,關閉按鈕等):
<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--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>
其次,將下面核心的js程式碼全部貼上過去(需要實現的小功能基本上都有,或者在api上找到相應的然後新增到引數裡即可,比如實現單擊放大的圖片就退回原來的小圖功能就是options裡面的tapToClose設定為true即可,如果不需要這個功能設定為false或者直接刪除這一行程式碼即可。):
var initPhotoSwipeFromDOM = function(gallerySelector) {
// 解析來自DOM元素幻燈片資料(URL,標題,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
// 僅包括元素節點
if(figureEl.nodeType !== 1) {
continue;
}
divEl = figureEl.children[0];
linkEl = divEl.children[0]; // <a> element
size = linkEl.getAttribute('data-size').split('x');
// 建立幻燈片物件
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> 縮圖節點, 檢索縮圖網址
item.msrc = linkEl.children[0].getAttribute('src');
}
item.el = figureEl; // 儲存連結元素 for getThumbBoundsFn
items.push(item);
}
return items;
};
// 查詢最近的父節點
var closest = function closest(el, fn) {
return el && ( fn(el) ? el : closest(el.parentNode, fn) );
};
// 當用戶點選縮圖觸發
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 = {};
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);
// 這裡可以定義引數
options = {
barsSize: {
top: 100,
bottom: 100
},
fullscreenEl : false,
//點選圖片關閉
tapToClose: true,
shareButtons: [
{id:'wechat', label:'分享微信', url:'#'},
{id:'weibo', label:'新浪微博', url:'#'},
{id:'download', label:'儲存圖片', 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
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;
}
// Parse URL and open gallery if it contains #&pid=3&gid=1
var hashData = photoswipeParseHash();
if(hashData.pid && hashData.gid) {
openPhotoSwipe( hashData.pid , galleryElements[ hashData.gid - 1 ], true, true );
}
};
// execute above function
initPhotoSwipeFromDOM('.my-gallery');
// $(".hairImg>div").each(function(){
// $(this).height($(this).width());
// });
function more(obj,id) {
if ($('#txt'+id).is(":hidden")) {
$('#p'+id).hide();
$('#txt'+id).show();
obj.innerHTML='收起';
} else {
$('#p'+id).show();
$('#txt'+id).hide();
obj.innerHTML='全文';
}
}
最後,展示下我的demo效果圖:
好了,這就是所有的乾貨,希望對你們有所幫助。貌似photoswiper.js api裡面有更簡化的,小夥伴們也可以去讀一下api。相關檔案的下載地址可以去Github:點選這裡