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手机端点击图片放大特效PhotoSwipe.js插件实现

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手机端点击图片放大特效PhotoSwipe.js插件实现

PhotoSwipe插件能实现手机端点击图片全屏放大 再双击图片放大等功能

PhotoSwipe插件官方网站 http://www.photoswipe.com/

但有一点不太好的是图片放大后再单击不能关闭浏览,要点击关闭按钮或者滑动才能关闭,找了好久配置项都没说到这点上的,只能自己动手改了。

打开photoswipe.js,大概在3179行有个关于tap的函数定义
在开头先定义一个变量

var tap_num = 0;

然后在onTapStart的定义里加入

//根据需求自己添加的S
//判断是单击还是双击 单击关闭 双击放大
tap_num++;
if(tap_num < 2){
 setTimeout(function(){
  if(tap_num > 1){
   tap_num = 0;
   return;
  }else{
   tap_num = 0;
   //判断是否有拖拽 如有拖拽触发拖拽事件 没有则关闭
   if(_isDragging){
    return;
   }else{
    self.close();
   }
  }
 },200);
}
//根据需求自己添加的E

大概整体就是这样

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;
   }

   //根据需求自己添加的S
   //判断是单击还是双击 单击关闭 双击放大
   tap_num++;
   if(tap_num < 2){
    setTimeout(function(){
     if(tap_num > 1){
      tap_num = 0;
      return;
     }else{
      tap_num = 0;
      //判断是否有拖拽 如有拖拽触发拖拽事件 没有则关闭
      if(_isDragging){
return;
      }else{
self.close();
      }
     }
    },200);
   }
   //根据需求自己添加的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);
   }
  }
 }
});

把修改后的photoswipe.js压缩一下,就能实现自己想要的功能了

另外,使用photoswipe插件需要插入框架和Javascript代码,可以把这些代码整合成一个js再引入,这样页面看起来就简洁了很多。
先在html写上图片相册结构,并配上样式


 
  
 

 
  
 


整理后的js

document.writeln("");
document.writeln("");
document.writeln("");
document.writeln(" ");
document.writeln(" 
"); document.writeln(""); document.writeln(" "); document.writeln(" "); document.writeln(""); document.writeln(" "); document.writeln(" "); document.writeln("
"); document.writeln("
"); document.writeln("
"); document.writeln(" "); document.writeln(""); document.writeln(" "); document.writeln(" "); document.writeln(""); document.writeln(" "); document.writeln(""); document.writeln(" "); document.writeln(""); document.writeln(" "); document.writeln(""); document.writeln(" "); document.writeln(""); document.writeln(" "); document.writeln(""); document.writeln(" "); document.writeln(""); document.writeln(" "); document.writeln(""); document.writeln(" "); document.writeln(" "); document.writeln(" "); document.writeln(" "); document.writeln(" "); document.writeln(""); document.writeln(" "); document.writeln(" "); document.writeln(" "); document.writeln(" "); document.writeln(""); document.writeln(" "); document.writeln(" "); document.writeln(" "); document.writeln(""); document.writeln(" "); document.writeln(""); document.writeln(" "); document.writeln(""); document.writeln(" "); document.writeln(" "); document.writeln(" "); document.writeln(""); document.writeln(" "); document.writeln(""); document.writeln(" "); document.writeln(""); document.writeln(""); (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 + '
Photo: ' + item.author + ''; 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.o.w; item.h = item.o.h; } else { item.src = item.m.src; item.w = item.m.w; item.h = item.m.h; } }); 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内容,希望对大家的学习有所帮助,也希望大家多多支持考高分网。

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