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

<div id="demo-test-gallery" class="demo-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" alt="" />
</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" alt="" />
</a>
</div>

整理后的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\'s a 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.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脚本之家。

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