发布于 2017-05-16 13:16:00 | 364 次阅读 | 评论: 0 | 来源: 网友投递

这里有新鲜出炉的Javascript教程,程序狗速度看过来!

JavaScript客户端脚本语言

Javascript 是一种由Netscape的LiveScript发展而来的原型化继承的基于对象的动态类型的区分大小写的客户端脚本语言,主要目的是为了解决服务器端语言,比如Perl,遗留的速度问题,为客户提供更流畅的浏览效果。


这篇文章主要为大家详细介绍了手机端点击图片放大特效PhotoSwipe.js插件实现方法,具有一定的参考价值,感兴趣的小伙伴们可以参考一下

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phperz。



最新网友评论  共有(0)条评论 发布评论 返回顶部

Copyright © 2007-2017 PHPERZ.COM All Rights Reserved   冀ICP备14009818号  版权声明  广告服务