手機端點擊圖片放大特效PhotoSwipe.js插件實現

PhotoSwipe插件能實現手機端點擊圖片全屏放大再雙擊圖片放大等功能

PhotoSwipe插件官方網站http://www.photoswipe.com/

但有一點不太好的是圖片放大後再單擊不能關閉瀏覽，要點擊關閉按鈕或者滑動才能關閉，找了好久配置項都沒說到這點上的，只能自己動手改了。

打開photoswipe.js，大概在3179行有個關於tap的函數定義

在開頭先定義一個變量

var tap_num = 0;

然後在onTapStart的定義裡加入

//根據需求自己添加的S//判斷是單擊還是雙擊單擊關閉雙擊放大tap_num++;if(tap_num < 2){ setTimeout(function(){ if(tap_num > 1){ tap_num = 0; return; }else{ tap_num = 0; //判斷是否有拖拽如有拖拽觸發拖拽事件沒有則關閉if(_isDragging){ return; }else{ self.close(); } } },200);}//根據需求自己添加的E

大概整體就是這樣

var tapTimer, tapReleasePoint = {}, _dispatchTapEvent = function(origEvent, releasePoint, pointerType) { var e = document.createEvent( 'CustomEvent' ), eDetail = { origEvent:origEvent, target:origEvent.target, releasePoint: releasePoint, pointerType:pointerType || 'touch' }; e.initCustomEvent( 'pswpTap', true, true, eDetail ); origEvent.target.dispatchEvent(e); };var tap_num = 0;_registerModule('Tap', { publicMethods: { initTap: function() { _listen('firstTouchStart', self.onTapStart); _listen('touchRelease', self.onTapRelease); _listen('destroy', function() { tapReleasePoint = {}; tapTimer = null; }); }, onTapStart: function(touchList) { if(touchList.length > 1) { clearTimeout(tapTimer); tapTimer = null; } //根據需求自己添加的S //判斷是單擊還是雙擊單擊關閉雙擊放大tap_num++; if(tap_num < 2){ setTimeout(function(){ if(tap_num > 1){ tap_num = 0; return; }else{ tap_num = 0; //判斷是否有拖拽如有拖拽觸發拖拽事件沒有則關閉if(_isDragging){ return; }else{ self.close(); } } },200); } //根據需求自己添加的E }, onTapRelease: function(e, releasePoint) { if(!releasePoint) { return; } if(!_moved && !_isMultitouch && !_numAnimations) { var p0 = releasePoint; if(tapTimer) { clearTimeout(tapTimer); tapTimer = null; // Check if taped on the same place if ( _isNearbyPoints(p0, tapReleasePoint) ) { _shout('doubleTap', p0); return; } } if(releasePoint.type === 'mouse') { _dispatchTapEvent(e, releasePoint, 'mouse'); return; } var clickedTagName = e.target.tagName.toUpperCase(); // avoid double tap delay on buttons and elements that have class pswp__single-tap if(clickedTagName === 'BUTTON' || framework.hasClass(e.target, 'pswp__single-tap') ) { _dispatchTapEvent(e, releasePoint); return; } _equalizePoints(tapReleasePoint, p0); tapTimer = setTimeout(function() { _dispatchTapEvent(e, releasePoint); tapTimer = null; }, 300); } } }});

把修改後的photoswipe.js壓縮一下，就能實現自己想要的功能了

另外，使用photoswipe插件需要插入框架和JavaScript代碼，可以把這些代碼整合成一個js再引入，這樣頁面看起來就簡潔了很多。

先在html寫上圖片相冊結構，並配上樣式

<div id="demo-test-gallery"> <a href="https://farm4.staticflickr.com/3894/15008518202_c265dfa55f_h.jpg" data-size="1600x1600" data-med="https://farm4.staticflickr.com/3894/15008518202_b016d7d289_b.jpg" data-med-size="1024x1024"> <img src="https://farm4.staticflickr.com/3894/15008518202_b016d7d289_m.jpg" /> </a> <a href="https://farm6.staticflickr.com/5591/15008867125_b61960af01_h.jpg" data-size="1600x1068" data-med="https://farm6.staticflickr.com/5591/15008867125_68a8ed88cc_b.jpg" data-med-size="1024x1024"> <img src="https://farm6.staticflickr.com/5591/15008867125_68a8ed88cc_m.jpg" /> </a></div>

整理後的js

 document.writeln("<!-- Root element of PhotoSwipe. Must have class pswp. -->");document.writeln("<div class=/"pswp/" tabindex=/"-1/" role=/"dialog/" aria-hidden=/"true/">");document.writeln("");document.writeln(" <!-- Background of PhotoSwipe.");document.writeln(" It/'sa separate element as animating opacity is faster than rgba(). -->");document.writeln(" <div class=/"pswp__bg/"><//div>");document.writeln("");document.writeln(" <!-- Slides wrapper with overflow:hidden. -->");document.writeln(" <div class=/"pswp__scroll-wrap/">");document.writeln("");document.writeln(" <!-- Container that holds slides.");document.writeln(" PhotoSwipe keeps only 3 of them in the DOM to save memory.");document.writeln(" Don/'t modify these 3 pswp__item elements, data is added later on. -->");document.writeln(" <div class=/"pswp__container/">");document.writeln(" <div class=/"pswp__item/"><//div>");document.writeln(" <div class=/"pswp__item/"><//div>");document.writeln(" <div class=/"pswp__item/"><//div>");document.writeln(" <//div>");document.writeln("");document.writeln(" <!-- Default (PhotoSwipeUI_Default) interface on top of sliding area. Can be changed. -->");document.writeln(" <div class=/"pswp__ui pswp__ui--hidden/">");document.writeln("");document.writeln(" <div class=/"pswp__top-bar/">");document.writeln("");document.writeln(" <!-- Controls are self-explanatory. Order can be changed. -->");document.writeln("");document.writeln(" <div class=/"pswp__counter/"><//div>");document.writeln("");document.writeln(" <button class=/"pswp__button pswp__button--close/" title=/"Close (Esc)/"><//button>");document.writeln("");document.writeln(" <button class=/"pswp__button pswp__button--share/" title=/"Share/"><//button>");document.writeln("");document.writeln(" <button class=/"pswp__button pswp__button--fs/" title=/"Toggle fullscreen/"><//button>");document.writeln("");document.writeln(" <button class=/"pswp__button pswp__button--zoom/" title=/"Zoom in//out/"><//button>");document.writeln("");document.writeln(" <!-- Preloader demo http:////codepen.io//dimsemenov//pen//yyBWoR -->");document.writeln(" <!-- element will get class pswp__preloader--active when preloader is running -->");document.writeln(" <div class=/"pswp__preloader/">");document.writeln(" <div class=/"pswp__preloader__icn/">");document.writeln(" <div class=/"pswp__preloader__cut/">");document.writeln(" <div class=/"pswp__preloader__donut/"><//div>");document.writeln(" <//div>");document.writeln(" <//div>");document.writeln(" <//div>");document.writeln(" <//div>");document.writeln("");document.writeln(" <div class=/"pswp__share-modal pswp__share-modal--hidden pswp__single-tap/">");document.writeln(" <div class=/"pswp__share-tooltip/"><//div>");document.writeln(" <//div>");document.writeln("");document.writeln(" <button class=/"pswp__button pswp__button--arrow--left/" title=/"Previous (arrow left)/">");document.writeln(" <//button>");document.writeln("");document.writeln(" <button class=/"pswp__button pswp__button--arrow--right/" title=/"Next (arrow right)/">");document.writeln(" <//button>");document.writeln("");document.writeln(" <div class=/"pswp__caption/">");document.writeln(" <div class=/"pswp__caption__center/"><//div>");document.writeln(" <//div>");document.writeln("");document.writeln(" <//div>");document.writeln("");document.writeln(" <//div>");document.writeln("");document.writeln("<//div>");(function() { var initPhotoSwipeFromDOM = function(gallerySelector) { var parseThumbnailElements = function(el) { var thumbElements = el.childNodes, numNodes = thumbElements.length, items = [], el, childElements, thumbnailEl, size, item; for(var i = 0; i < numNodes; i++) { el = thumbElements[i]; // include only element nodes if(el.nodeType !== 1) { continue; } childElements = el.children; size = el.getAttribute('data-size').split('x'); // create slide object item = { src: el.getAttribute('href'), w: parseInt(size[0], 10), h: parseInt(size[1], 10), author: el.getAttribute('data-author') }; item.el = el; // save link to element for getThumbBoundsFn if(childElements.length > 0) { item.msrc = childElements[0].getAttribute('src'); // thumbnail url if(childElements.length > 1) { item.title = childElements[1].innerHTML; // caption (contents of figure) } } var mediumSrc = el.getAttribute('data-med'); if(mediumSrc) { size = el.getAttribute('data-med-size').split('x'); // "medium-sized" image item.m = { src: mediumSrc, w: parseInt(size[0], 10), h: parseInt(size[1], 10) }; } // original image item.o = { src: item.src, w: item.w, h: item.h }; items.push(item); } return items; }; // find nearest parent element var closest = function closest(el, fn) { return el && ( fn(el) ? el : closest(el.parentNode, fn) ); }; 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 === 'A'; }); if(!clickedListItem) { return; } var clickedGallery = clickedListItem.parentNode; var 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) { // pid=1 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); // define options (if needed) options = { galleryUID: galleryElement.getAttribute('data-pswp-uid'), getThumbBoundsFn: function(index) { // See Options->getThumbBoundsFn section of docs for more info var thumbnail = items[index].el.children[0], pageYScroll = window.pageYOffset || document.documentElement.scrollTop, rect = thumbnail.getBoundingClientRect(); return {x:rect.left, y:rect.top + pageYScroll, w:rect.width}; }, addCaptionHTMLFn: function(item, captionEl, isFake) { if(!item.title) { captionEl.children[0].innerText = ''; return false; } captionEl.children[0].innerHTML = item.title + '<br/><small>Photo: ' + item.author + '</small>'; return true; } }; // options for control bar options.shareEl = false; options.fullscreenEl = false; if(fromURL) { if(options.galleryPIDs) { // parse real index when custom PIDs are used // http://photoswipe.com/documentation/faq.html#custom-pid-in-url 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); } // exit if index not found if( isNaN(options.index) ) { return; } // Pass data to PhotoSwipe and initialize it gallery = new PhotoSwipe( pswpElement, PhotoSwipeUI_Default, items, options); // see: http://photoswipe.com/documentation/responsive-images.html var realViewportWidth, useLargeImages = false, firstResize = true, imageSrcWillChange; gallery.listen('beforeResize', function() { var dpiRatio = window.devicePixelRatio ? window.devicePixelRatio : 1; dpiRatio = Math.min(dpiRatio, 2.5); realViewportWidth = gallery.viewportSize.x * dpiRatio; if(realViewportWidth >= 1200 || (!gallery.likelyTouchDevice && realViewportWidth > 800) || screen.width > 1200 ) { if(!useLargeImages) { useLargeImages = true; imageSrcWillChange = true; } } else { if(useLargeImages) { useLargeImages = false; imageSrcWillChange = true; } } if(imageSrcWillChange && !firstResize) { gallery.invalidateCurrItems(); } if(firstResize) { firstResize = false; } imageSrcWillChange = false; }); gallery.listen('gettingData', function(index, item) { if( useLargeImages ) { item.src = item.o.src; item.w = item.ow; item.h = item.oh; } else { item.src = item.m.src; item.w = item.mw; item.h = item.mh; } }); gallery.init(); }; // select all gallery elements 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 ); } }; initPhotoSwipeFromDOM('.demo-gallery'); })();

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持武林網。