js为Div增加滚动条特效

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引入JS
- 3.0.0 2.2.0 2.1.4 2.1.3 2.1.2 2.1.1 2.1.0 2.0.3 2.0.2 2.0.1 2.0.0 1.12.0 1.11.3 1.11.2 1.11.1 1.11.0 1.10.2 1.10.1 1.10.0 1.9.1 1.9.0 1.8.3 1.8.2 1.8.1 1.8.0 1.7.2 1.7.1 1.7 1.6.4 1.6.2 1.6.1 1.4.4 1.4.3 1.4.2 1.4.1 1.4.0
- 1.7.3 1.7.2 1.7.1.0 1.7.0.0
- 2.0.0-beta.0 2.0.0-alpha.55 1.5.0-rc.0 1.4.8 1.4.0 1.3.20 1.2.29 1.1.5 1.0.8
- 1.8.3 1.7.0 1.6.0 1.5.2 1.4.4 1.3.3 1.2.4 1.1.7
- 1.10.4 1.9.7 1.8.10 1.7.8 1.6.3 1.5.4 1.4.6 1.3.3
- core1.6.0 core-compat1.6.0 core1.5.2 core-compat1.5.2 core-full-compat-yc1.4.5 core-full-compat1.4.5 core-full-nocompat-yc1.4.5 core-full-nocompat1.4.5
- 1.4.2 1.4.1 1.4.0 1.3.0 1.2.0 1.1.0
- 3.7.3 3.7.2 3.7.1 3.7.0 3.7 3.6.2 3.6.1 3.6

引入框架
- 1.4.5 1.4.4 1.4.3 1.4.2 1.4.1 1.4.0 1.3.2
- 1.11.4 1.11.3 1.11.2 1.11.1 1.11.0 1.10.4 1.10.3 1.10.2
- 3.3.6 3.3.5 3.3.0 3.2.0 2.3.2

汉王

HTML代码

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<!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>js滚动条特效</title>
<style type="text/css">
*{ margin:0; padding:0;}
p{ height:1000px;}
#mainBox{ width:400px; height:500px; border:1px #bbb solid; position:relative; overflow:hidden; margin:50px auto;}
#content{  height:2500px; position:absolute; left:0; top:0; background:url(//ku.shouce.ren/files/images/201601/56a34add6beca.gif) }
.scrollDiv{ width:18px;  position:absolute; top:0; background:#666; border-radius:10px;}
</style>
</head>
<body>
<div id="mainBox">
 <div id="content"></div>
</div>
<p></p>
<script type="text/javascript">
var doc=document;
var _wheelData=-1;
var mainBox=doc.getElementById('mainBox');
function bind(obj,type,handler){
 var node=typeof obj=="string"?$(obj):obj;
 if(node.addEventListener){
  node.addEventListener(type,handler,false);
 }else if(node.attachEvent){
  node.attachEvent('on'+type,handler);
 }else{
  node['on'+type]=handler;
 }
}
function mouseWheel(obj,handler){
 var node=typeof obj=="string"?$(obj):obj;
  bind(node,'mousewheel',function(event){
   var data=-getWheelData(event);
   handler(data);
   if(document.all){
    window.event.returnValue=false;
   }else{
    event.preventDefault();
   }
   
  });
  //火狐
  bind(node,'DOMMouseScroll',function(event){
   var data=getWheelData(event);
   handler(data);
   event.preventDefault();
  });
  function getWheelData(event){
   var e=event||window.event;
   return e.wheelDelta?e.wheelDelta:e.detail*40;
  }
}
function addScroll(){
 this.init.apply(this,arguments);
}
addScroll.prototype={
 init:function(mainBox,contentBox,className){
  var mainBox=doc.getElementById(mainBox);
  var contentBox=doc.getElementById(contentBox);
  var scrollDiv=this._createScroll(mainBox,className);
  this._resizeScorll(scrollDiv,mainBox,contentBox);
  this._tragScroll(scrollDiv,mainBox,contentBox);
  this._wheelChange(scrollDiv,mainBox,contentBox);
  this._clickScroll(scrollDiv,mainBox,contentBox);
 },
 //创建滚动条
 _createScroll:function(mainBox,className){
  var _scrollBox=doc.createElement('div')
  var _scroll=doc.createElement('div');
  var span=doc.createElement('span');
  _scrollBox.appendChild(_scroll);
  _scroll.appendChild(span);
  _scroll.className=className;
  mainBox.appendChild(_scrollBox);
  return _scroll;
 },
 //调整滚动条
 _resizeScorll:function(element,mainBox,contentBox){
  var p=element.parentNode;
  var conHeight=contentBox.offsetHeight;
  var _width=mainBox.clientWidth;
  var _height=mainBox.clientHeight;
  var _scrollWidth=element.offsetWidth;
  var _left=_width-_scrollWidth;
  p.style.width=_scrollWidth+"px";
  p.style.height=_height+"px";
  p.style.left=_left+"px";
  p.style.position="absolute";
  p.style.background="#ccc";
  contentBox.style.width=(mainBox.offsetWidth-_scrollWidth)+"px";
  var _scrollHeight=parseInt(_height*(_height/conHeight));
  if(_scrollHeight>=mainBox.clientHeight){
   element.parentNode.style.display="none";
  }
  element.style.height=_scrollHeight+"px";
 },
 //拖动滚动条
 _tragScroll:function(element,mainBox,contentBox){
  var mainHeight=mainBox.clientHeight;
  element.onmousedown=function(event){
   var _this=this;
   var _scrollTop=element.offsetTop;
   var e=event||window.event;
   var top=e.clientY;
   //this.onmousemove=scrollGo;
   document.onmousemove=scrollGo;
   document.onmouseup=function(event){
    this.onmousemove=null;
   }
   function scrollGo(event){
    var e=event||window.event;
    var _top=e.clientY;
    var _t=_top-top+_scrollTop;
    if(_t>(mainHeight-element.offsetHeight)){
     _t=mainHeight-element.offsetHeight;
    }
    if(_t<=0){
     _t=0;
    }
    element.style.top=_t+"px";
    contentBox.style.top=-_t*(contentBox.offsetHeight/mainBox.offsetHeight)+"px";
    _wheelData=_t;
   }
  }
  element.onmouseover=function(){
   this.style.background="#444"; 
  }
  element.onmouseout=function(){
   this.style.background="#666"; 
  }
 },
 //鼠标滚轮滚动，滚动条滚动
 _wheelChange:function(element,mainBox,contentBox){
  var node=typeof mainBox=="string"?$(mainBox):mainBox;
  var flag=0,rate=0,wheelFlag=0;
  if(node){
   mouseWheel(node,function(data){
    wheelFlag+=data;
    if(_wheelData>=0){
     flag=_wheelData;
     element.style.top=flag+"px";
     wheelFlag=_wheelData*12;
     _wheelData=-1;
    }else{
     flag=wheelFlag/12;
    }
    if(flag<=0){
     flag=0;
     wheelFlag=0;
    }
    if(flag>=(mainBox.offsetHeight-element.offsetHeight)){
     flag=(mainBox.clientHeight-element.offsetHeight);
     wheelFlag=(mainBox.clientHeight-element.offsetHeight)*12;
     
    }
    element.style.top=flag+"px";
    contentBox.style.top=-flag*(contentBox.offsetHeight/mainBox.offsetHeight)+"px";
   });
  }
 },
 _clickScroll:function(element,mainBox,contentBox){
  var p=element.parentNode;
  p.onclick=function(event){
   var e=event||window.event;
   var t=e.target||e.srcElement;
   var sTop=document.documentElement.scrollTop>0?document.documentElement.scrollTop:document.body.scrollTop;
   var top=mainBox.offsetTop;
   var _top=e.clientY+sTop-top-element.offsetHeight/2;
   if(_top<=0){
    _top=0;
   }
   if(_top>=(mainBox.clientHeight-element.offsetHeight)){
    _top=mainBox.clientHeight-element.offsetHeight;
   }
   if(t!=element){
    element.style.top=_top+"px";
    contentBox.style.top=-_top*(contentBox.offsetHeight/mainBox.offsetHeight)+"px";
    _wheelData=_top;
   }
  }
 }
}
new addScroll('mainBox','content','scrollDiv');
</script>
</body>
</html>

AخA
 
<!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>js滚动条特效</title>
<style type="text/css">
*{ margin:0; padding:0;}
p{ height:1000px;}
#mainBox{ width:400px; height:500px; border:1px #bbb solid; position:relative; overflow:hidden; margin:50px auto;}
#content{  height:2500px; position:absolute; left:0; top:0; background:url(//ku.shouce.ren/files/images/201601/56a34add6beca.gif) }
.scrollDiv{ width:18px;  position:absolute; top:0; background:#666; border-radius:10px;}
</style>
</head>
<body>
<div id="mainBox">

CSS代码

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CSS代码...​x
 
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JS代码

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JS代码...xxxxxxxxxx
 
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简介

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名称

js为Div增加滚动条特效

分类

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描述

进入Div布局时代，让人激动，Div本没有滚动条，它要么是强制隐藏或换行显示里面的内容，要么是被里面的内容撑大，找一个折中的办法，那就是让Div随内容自动出现滚动条，那么本例代码正是你想要的，它会随着里面图片的多少出现滚动条，运...