Custom web page drag class implemented by JS_javascript skills-JS Tutorial-php.cn

Custom web page drag class implemented by JS_javascript skills

WBOY

Release： 2016-05-16 15:33:34

Original

1004 people have browsed it

The example in this article describes the custom web page drag class implemented in JS. Share it with everyone for your reference, the details are as follows:

First look at the screenshots of the running effect:

The online demo address is as follows:

http://demo.jb51.net/js/2015/js-zdy-web-drug-pic-style-codes/

The specific 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=gb2312" />
<title>自写的拖动类……</title>
<script type="text/javascript">
var d=document;//给document对象一个通用的事件侦听方法
d.addListener=function(e,f,b){
 this.attachEvent&#63;this.attachEvent('on'+e,f):this.addEventListener(e,f,b);
}
d.removeListener=function(e,f,b){
 this.detachEvent&#63;this.detachEvent('on'+e,f):this.removeEventListener(e,f,b);
}
function $(){//接收一个id参数，返回带有startDrag方法的对象
 var o=document.getElementById(arguments[0]);
 o.addListener=function(e,f,b){
  this.attachEvent&#63;this.attachEvent('on'+e,f):this.addEventListener(e,f,b);
 }
 o.removeListener=function(e,f,b){
  this.detachEvent&#63;this.detachEvent('on'+e,f):this.removeEventListener(e,f,b);
 }
 o.startDrag=function(obj){//参数obj默认为o本身，可以传其它参数以确定要移动的对象
  var obj=obj&#63;obj:o;
  var sx,sy;
  o.style.cursor="move";
  o.addListener("mousedown",function(e){
   e||event;
   if(e.button==1||e.button==0){
    sx=e.clientX-obj.offsetLeft;sy=e.clientY-obj.offsetTop;
    d.addListener("mousemove",move,false);
    d.addListener("mouseup",stopDrag,false);
   }
  },false);
  var stopDrag=function(){
   d.removeListener("mousemove",move,false);
   d.removeListener("mouseup",stopDrag,false);
  }
  var move=function(e){
   e||event;
   window.getSelection &#63; window.getSelection().removeAllRanges() :
    document.selection.empty();
   if(e.preventDefault)e.preventDefault();//这两句便是解决firefox拖动问题的.
   with (obj.style){
    position="absolute"
    left=e.clientX-sx+"px";
    top=e.clientY-sy+"px";
   }
  }
 }
 return o; 
}
window.onload=function(){$("ok").startDrag($("os"))}//本例中拖动ok元素，移动其父元素
</script>
<style type="text/css">
*{margin:0;padding:0}
#ok{width:215px;height:170px;background:url(images/sample1.gif)}
#os{width:400px;height:300px;background:#09f;left:300px}
#os2{width:400px;height:300px;background:#f90;}
</style>
</head>
<body>
<div id="os"><p id="ok"></p></div>
<div id="os2"></div>
</body>
</html>

Copy after login

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