jQuery implements a simple image viewer

In the project, I DIYed a picture viewer. Because the initial code is not my own, I just changed it a little and it didn't turn out very well. I will rewrite the styles and encapsulation when I have time later, just accumulate them as backup. If there are children’s shoes that are useful, you can completely modify them on this basis. It is relatively easy and the code is relatively simple

The picture viewer has several main functions:

　　1. Display pictures and picture information (picture name, publisher, etc.)

　2. Switch pictures

　3. Close the picture viewer

Initialization interface function pictureViewer.init: function(picInfos,tapNumber,isBig)

picInfos: 传入图片组信息，必须，格式如下
 var picInfos = [
  {
   "url" : "default.png",
   "data": [
   {
    "key":"名称:",
    "value":"测试图片"
   },
   {
    "key":"发布者：",
    "value":"chua"
   }
   ]
  },
  {
   "url" : "test.jpeg",
   "data": [
   {
    "key":"名称",
    "value":"测试图片"
   },
   {
    "key":"发布者：",
    "value":"发大水发大水发顺风h"
   },
   {
    "key":"这个图片的其他信息",
    "value":"vsfsgsdgfds234323424"
   }
   ]
  },
  ...
 ] //传入参数的样式

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tapNumber: The index of the picture to be displayed in the picture list, must start from 0
isBig: Whether to use large image for viewing, the default is false, optional
The html and css source codes are as follows (an example follows)

<!DOCTYPE html>
<html lang="ch-cn">
 <head>
　　<meta charset="utf-8">
　　<script type="text/javascript" src='jquery-1.9.1.js'></script>
 <link rel="stylesheet" type="text/css" href="imgTap.css">
 <script type="text/javascript" src='imgTap.js'></script>
 <style type="text/css">
 html,body, div, dl, dt, dd, ul, ol, li, h1, h2, h3, h4, h5, h6, pre, code, form, fieldset, legend, input, button, textarea, p, blockquote, th, td{
  margin: 0;
  padding:0;
 }
 *{
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
 }

 body{
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
 }
 .imgTapDetail {
  display: none;
  position: absolute;
  z-index: 2000;
  top: 0;
  width: 100%;
  height: 100%;
  background: none transparent scroll repeat 0% 0%;
  color: #000 !important;
 }
 .page-secShadow {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: #000;
  background-color: rgba(0,0,0,.3);
  filter: alpha(opacity=50);
 }

 .page-shadowContent {
  width: 40%;
  margin: 0 auto;
  margin-top: 20%;
  position: relative !important;
  min-width: 400px;
 }
 .page-shadowContent.widget-big{

 }
 .leftTap, .rightTap {
  margin-top: 50%;
  width: 80px;
  height: 80px;
  border-radius: 50%;
  position: absolute;
  top: -80px;
  cursor: pointer;
 }
 .leftTap {
  left: -30%;
  background: url("imgTap.png") 0 0 no-repeat;
 }
 .rightTap {
  right: -30%;
  background: url("imgTap.png") -80px 0 no-repeat;
 }
 .closeTap {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  position: absolute;
  right: -30px;
  top: -30px;
  cursor: pointer;
  background: url("imgTap.png") 0 -165px no-repeat;
  z-index: 99;
 }
 .widget {
  padding: 0 5px;
  -webkit-box-shadow: none;
  -moz-box-shadow: none;
  box-shadow: none;
  margin: 3px 0 10px 0;
 }
 .widget-body {
  background-color: #fff;
  -webkit-box-shadow: 1px 0 10px 1px rgba(0,0,0,.3);
  -moz-box-shadow: 1px 0 10px 1px rgba(0,0,0,.3);
  box-shadow: 1px 0 10px 1px rgba(0,0,0,.3);
  padding: 12px;
 }
 .page-shadowContent .widget-body {
  min-height: 200px;
  padding: 15px!important;
  border: 1px solid #ccc;
  overflow: hidden;
 }
 .widget-body .row {
  margin-right: -10px !important;
  margin-left: -10px !important;
 }
 .imgShow {
  text-align: center;
  height: 400px;
  padding-left: 10px;
  padding-right: 10px;
  /*background: url(default.png) center no-repeat;*/
 }
 #tapContent{
  padding-left: 10px;
  padding-right: 10px;
 }
 .imgContent {
  max-width: 400px;
  max-height: 400px;
  vertical-align: middle;
 }
 .widget-body img {
  max-width: 100%;
  height: auto!important;
 }
 .imgShow > span {
  height: 100%;
  display: inline-block;
  vertical-align: middle;
 } 
 .imgTapDetail .form-group {
  overflow: hidden;
  margin-bottom: 0 !important;
  position: relative;
  min-height: 34px;
 }
 .widget-detail .form-group .detail-LabelStyle {
  float: left;
  padding-left: 5px;
  /* max-width: 50%; */
  text-align: left;
  line-height: 34px!important;
  color: rgb(115, 115, 115);
  padding-right: 5px;
  height: 34px;
  overflow: hidden;
  left: 0;
  top: 0;
 }
 .widget-detail .form-group .detail-SpanStyle {
  padding: 8px 0 6px 5px;
  line-height: 20px;
  width: auto;
  height: auto!important;
  min-height: 34px;
  float: left;
  /* margin-left: 80px; */
  word-break: break-all;
 }
 .widget-big {
  width: 80%;
  min-width: 300px;
 }
 .widget-big .leftTap{
  left: -10%;
 }
 .widget-big .rightTap{
  right: -10%;
 }
 .widget-big .widget-detail{
  padding: 40px 0;
 }
 .widget-big .imgShow{
  min-height: 500px;
 }
 .widget-big .imgShow img{
  max-width: 800px; 
  max-height: 550px;
 }
 </style>
 </head>
 <body >
 <div class="imgTapDetail"></div>
 <script type="text/javascript">
 var picInfos = [
  {
  "url" : "default.png",
  "data": [
   {
   "key":"名称:",
   "value":"测试图片"
   },
   {
   "key":"发布者：",
   "value":"chua"
   }
  ]
  },
  {
  "url" : "test.jpeg",
  "data": [
   {
   "key":"名称",
   "value":"测试图片"
   },
   {
   "key":"发布者：",
   "value":"发大水发大水发顺风h"
   },
   {
   "key":"这个图片的其他信息",
   "value":"vsfsgsdgfds234323424"
   }
  ]
  }
 ] 
 pictureViewer.init(picInfos,0,true);
 </script> 
</html>

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The source code of js is as follows

pictureViewer = {
 picInfos: [],
 curPicIndex: 0,
 isBig:false,//大图查看？默认为false。默认图片显示区域为window宽度的40%，大图为80%
 imgTapSelector:".imgTapDetail",
 init: function(picInfos,tapNumber,isBig){
  var _this = this;

  _this.picInfos = picInfos;
  _this.curPicIndex = tapNumber;
  _this.isBig = isBig;
  tapImgInit();
  
  //图片查看器初始化
  function tapImgInit(){
   //页面代码和事件只需要初始化一次即可
   if(!_this.guid){
    _this.guid = 1;
    initTapImgHtml();
    $(document).on("click","#rightTap",function(){
     _this.curPicIndex++;
     if(_this.curPicIndex == _this.picInfos.length){
      _this.curPicIndex = 0;
     }
     $("#tapContent").html("")
     tapImg()
    }).on("click","#leftTap",function(){
     _this.curPicIndex--;
     if(_this.curPicIndex < 0){
      _this.curPicIndex = _this.picInfos.length-1;
     }
     $("#tapContent").html("")
     tapImg();
    }).on("click","#closeTap",function(){
     $(_this.imgTapSelector).hide("fast")
    })
   }
   var offTop = top.document.body.scrollTop || top.document.documentElement.scrollTop;
   $('#imgTapPanel').css("margin-top",_this.isBig&#63;(offTop>30&#63;offTop:30):offTop + 100)
   tapImg();
   $(_this.imgTapSelector).show("fast");
  }
  //初始化图片查看器的html代码
  function initTapImgHtml(){
   var $detailText = '<div class="page-secShadow" >'
    + '<div id="imgTapPanel" class="page-shadowContent '+(_this.isBig&#63;"widget-big":"")+'">'
    + '<div id="leftTap" class="leftTap"></div>'
    + '<div id="rightTap" class="rightTap"></div>'
    + '<div id="closeTap" class="closeTap"></div>'
    + '<div class="widget row"><div class="widget-body">'
    + '<div class="widget-detail row">'
    + '<div class="imgShow">'
    + '<img src="logo.png" id="tapImg" class="imgContent"><span></span>'
    + '</div>'
    + '<div id="tapContent"></div>'
    + '</div></div></div></div></div>';  
   
   $(_this.imgTapSelector).html($detailText);
   hoverButton("#leftTap", 0, 0, 0, "-80px");
   hoverButton("#rightTap", "-80px", 0, "-80px", "-80px");
   hoverButton("#closeTap", 0, "-165px", "-60px", "-165px");
  }
  //添加左右切换图标、关闭图标的hover响应事件。这个其实可以起到css中更好一些
  function hoverButton(id, x, y, A, B){
   $(id).hover(function(){
    $(this).css('background-position', A + ' '+ B)
   },function(){
    $(this).css('background-position', x + ' '+ y)
   })
  }
  //刷新当前图片及图片信息
  function tapImg(){
   var reg = /[:：]$/,
   leftTap = $("#leftTap"),
   rightTap = $("#rightTap"),
   imgTap = $("#tapImg"),
   contentTap = $("#tapContent");

   leftTap.css("display","block");
   rightTap.css("display","block");
   if(_this.picInfos.length == 1){
    leftTap.css("display","none");
    rightTap.css("display","none");
   }
   imgTap.attr("src",_this.picInfos[_this.curPicIndex].url);

   var data = _this.picInfos[_this.curPicIndex].data,
   dataLength = data.length,
   $text = "";

   for(var i=0; i<dataLength; i++){
    $text += '<div class="form-group">'
     + '<label class="detail-LabelStyle">'+data[i].key.replace(reg,"")+'：</label>'
     + '<span id="spanLoginName" class="detail-SpanStyle">'+data[i].value+'</span>'
     + '</div>';
   };
   contentTap.empty().append($text);

   setTimeout(function(){
    if(_this.isBig && imgTap.height() > 400){
     imgTap.parent().attr("style","height:inherit");
    }else{
     imgTap.parent().removeAttr("style");
    }
   },1);
  }
 }
}

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I hope this article will be helpful to everyone learning JavaScript programming.

jQuery implements a simple image viewer_jquery