search

Home  >  Article  >  Web Front-end  >  The jquery plug-in jquery.LightBox.js realizes the effect of clicking to enlarge the picture and clicking left and right (with demo source code download)_jquery

The jquery plug-in jquery.LightBox.js realizes the effect of clicking to enlarge the picture and clicking left and right (with demo source code download)_jquery

WBOY
WBOYOriginal
2016-05-16 15:13:451675browse

The example in this article describes the jquery plug-in jquery.LightBox.js to achieve the effect of clicking to enlarge the picture and clicking left and right to switch. Share it with everyone for your reference, the details are as follows:

This plug-in is written by the author of the article. The purpose is to improve the author's js ability and also provide some convenience for some js novices when using the plug-in. Veterans can just fly by leisurely.

This plug-in is designed to achieve the currently popular effects of clicking to enlarge a picture and clicking left and right to switch pictures. You can set whether to add the effect of switching pictures left or right according to your actual needs. The overall code is as follows: 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style>
*{margin:0;padding:0;}
li{list-style:none;}
.item{margin:20px;}
.item ul li{float:left;margin-right:20px;}
.item ul li img{width:100px;cursor:pointer;}
.lb_wrap{display:none;}
.lightbox_bg{background:#000;filter:alpha(opacity=70);opacity:.7;position:absolute;left:0;top:0;width:100%;height:100%;z-index:1;}
.lightbox{position:absolute;left:0;top:50%;width:100%;z-index:2;text-align:center;}
.lightbox p{position:absolute;height:61px;width:38px;top:50%;left:0;z-index:2;background:transparent url(themes.png) no-repeat left top;margin-top:-30.5px;cursor:pointer;}
.lightbox p.next{left:auto;background-position:right top;right:0;}
</style>
<script type="text/javascript" src="jquery-1.7.1.js"></script>
<script type="text/javascript" src="jquery.LightBox.js"></script>
</head>
<body>
<div class="item">
 <ul>
  <li><img src="01.jpg" /></li>
  <li><img src="02.jpg" /></li>
  <li><img src="03.jpg" /></li>
  <li><img src="04.jpg" /></li>
  <li><img src="05.jpg" /></li>
  <li><img src="06.jpg" /></li>
 </ul>
</div>
<script>
$(function(){
  $(".item").LightBox({
    controls : true //上一张、下一张按钮是否显示，默认是显示true
    });
  })
</script>
</body>
</html>

Plug-in jquery.LightBox.js code: 

/*
*LightBox 1.0
*dependence jquery-1.7.1.js
*/
;(function(a){
  a.fn.LightBox = function(options){
    var defaults = {
      controls : true //上一张、下一张按钮是否显示，默认是显示true
      }
    var opts = a.extend(defaults, options);
    var lb_wrap = '<div class="lb_wrap"><div class="lightbox_bg"></div><div class="lightbox"><img src="loading.gif" class="lg_img"></div></div>';
    a("body").append(lb_wrap);
    //controls
    if(opts.controls){
      a(".lightbox").append('<p class="prev"></p><p class="next"></p>');
      }
    function imgobj(obj1, obj2){
      //imgObj.height是通过img对象获取的图片的实际高度
      var imgObj = new Image();
      imgObj.src = obj1.attr("src");
      var margintop = 0 - (imgObj.height)/2;
      obj2.css("margin-top",margintop);
      }
    this.each(function(){
      var obj = a(this);
      var numpic = obj.find("li").length;
      var num = 0;
      //点击赋值并显示
      obj.find("img").click(function(){
        var src = a(this).attr("src");
        a(".lg_img").attr("src",src);
        imgobj(a(".lg_img"), a(".lightbox"));
        a(".lb_wrap").fadeIn();
        a(".lg_img").fadeIn();
        a(".prev").fadeIn().siblings(".next").fadeIn();
        num = a(this).parent().index();  //获取当前图片的父元素的索引并赋给num为后边点击上一张、下一张服务
        });
      //上一张
      a(".prev").click(function(){
        if(num == 0){
           num = numpic;
         }
        var src = obj.find("li").eq(num-1).find("img").attr("src");
        a(".lg_img").attr("src",src);
        imgobj(a(".lg_img"), a(".lightbox"));
        num--;
        });
      //下一张
      a(".next").click(function(){
        if(num == numpic-1){
           num = -1;
        }
        var src = obj.find("li").eq(num+1).find("img").attr("src");
        a(".lg_img").attr("src",src);
        imgobj(a(".lg_img"), a(".lightbox"));
        num++;
        });
      //点击除了上一张、下一张之外的其他地方隐藏
      a(".lb_wrap").click(function(e){
         var e = e || window.event;
         var elem = e.target || e.srcElement;
         while(elem){
           if (elem.className && elem.className.indexOf('prev')>-1) {
             return;
           }
           if(elem.className && elem.className.indexOf('next')>-1){
             return;
             }
           elem = elem.parentNode;
         }
         a(this).find("img").attr("src","loading.gif").hide(); //隐藏后，再将默认的图片赋给lightbox中图片的src
         a(this).find(".prev").hide().siblings(".next").hide();
         a(this).fadeOut();
        });
      })
    }
})(jQuery);

Click here for complete example codeDownload from this site.

Readers who are interested in more jQuery-related content can check out the special topics on this site: "JQuery drag effects and skills summary", "jQuery extension skills summary", "JQuery common classic special effects summary", "jQuery animation and special effects usage summary" and "jquery selector usage summary"

I hope this article will be helpful to everyone in jQuery programming.

Statement：
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Previous article：JS method to dynamically change the text size of web pages in real time according to the size of the browser window_javascript skillsNext article：JS method to dynamically change the text size of web pages in real time according to the size of the browser window_javascript skills

Related articles

See more