javascript 简单抽屉效果的实现代码

css

<style type="text/css"> 
#bodycontainer 
{ 
height: 66px; 
} 
#leftcontainer 
{ 
background-color: #C5C5C5; 
float: left; 
border: 1px solid #C5C5C5; 
} 
</style>

aspx:

<div id="bodycontainer"> 
<div id="leftcontainer+<%#Container.ItemIndex+1 %>" style="display:none;"> 
<%#hiSoft.AMS.BLL.BAssetAlteration.getActionLinksString(Eval("ID"), g_Sites, g_Permission)%> 
</div> 
<div> 
<img title="show" alt="open" src="Images/x16.gif" id="showleft+<%#Container.ItemIndex+1 %>" onclick="var leftslider = new slider(this,1,50,85,20,1,20);leftslider.show();this.style.display='none';Show(this);"/> 
<script type="text/javascript"> 
function Show(a) { 
//a.style.display = 'none'; 
document.getElementById(a.parentElement.children[2].id).style.display = ''; 
} 
</script> 
<img title="hidden" alt="close" src="Images/x16.gif" id="hideleft+<%#Container.ItemIndex+1 %>" onclick="var leftslider = new slider(this,1,50,85,20,1,20);leftslider.hide();this.style.display='none';document.getElementById(this.parentElement.children[0].id).style.display='';" style="display:none " /> 
</div> 
</div> 
 

slider.js:

slider.names = new Array(); 
function slider() 
{ 
this.id = slider.names.length; 
slider.names[this.id] = this; 
this.target = document.getElementById(arguments[0].parentElement.parentElement.children[0].id); //第一个参数：被操作div的id 
this.direction = arguments[1];//第二个参数：div弹出的方向 
this.height = arguments[2];//第三个参数：div的高度 
this.width = arguments[3];//第四个参数：div的宽度 
this.step = arguments[4];//第五个参数：希望动作分解为几步完成 
this.timer = 10 * arguments[5];//第六个参数：每个动作的间隔时间，10ms为一个单位 
this.startopa = arguments[6];//第七个参数：div开始的透明度 
this.sparent = this.target.parentNode;//获取操作div的父容器 
this.intervalid = null;//循环定时的id 
this.i = 0;//循环的计数器 
this.status = 0;//slider层的状态：0-可以展开；1-不可以展开 
this.target.style.display = "none";//先将div隐去 
return this; 
} 
slider.prototype.initialize = function() 
{ 
this.sparent.style.overflow = "hidden";//设置父容器overflow 
this.target.style.width = Number(this.width) + 'px';//设置目标div的宽度 
this.target.style.height = Number(this.height) + 'px';//设置目标div的高度 
this.target.style.position = "";//设置目标div的定位方式 
this.target.style.display = "";//设置目标div的显示方式 
this.target.style.filter = 'Alpha(opacity=' + Number(this.startopa) + ')';//设置目标div的透明度为初始透明度 
this.target.style.overflow = "hidden";//设置overflow 
switch(this.direction)//根据弹出方向设定div的margin 
{ 
case 1://left to right 
this.target.style.marginLeft = "-" + this.width + "px"; 
break; 
case 2://top to bottom 
this.target.style.marginTop = "-" + this.height + "px"; 
break; 
case 3://right to left 
this.target.style.marginRight = "-" + this.width + "px"; 
break; 
} 
} 
slider.prototype.show = function() 
{ 
if (this.status==0)//检查状态是否已经展开 
{ 
this.initialize();//操作div及其父容器的初始化 
this.intervalid = window.setInterval("slider.names["+this.id+"].cycle()",this.timer);//设置动作循环 
} 
} 
slider.prototype.hide = function() 
{ 
if (this.status==1)//检查状态是否已经展开 
{ 
this.intervalid = window.setInterval("slider.names["+this.id+"].decycle()",this.timer);//设置动作循环 
} 
} 
slider.prototype.cycle = function() //单步循环动作 
{ 
var opa = this.target.style.filter.split("=")[1].split(")")[0]//获取目标div的透明度数值 
var opastep = Math.round(((100 - Number(opa)) / this.step)+2.5);//计算每步增加的透明度 
var nopa = Number(opa) + Number(opastep);//当前透明度 
if (nopa>100){this.target.style.filter = 'Alpha(opacity=100)';}else{this.target.style.filter = 'Alpha(opacity=' + String(nopa) + ')';}//给div透明度赋值 
switch(this.direction)//根据弹出方向计算和设定div的动作 
{ 
case 1: //left to right 
var opx = this.target.style.marginLeft.split("px")[0]; 
var pxstep = Math.round((this.width / this.step)+0.5); 
var npx = Number(opx) + Number(pxstep); 
if (npx>0){this.target.style.marginLeft = '0px';}else{this.target.style.marginLeft = String(npx) + 'px';} 
break; 
case 2: //top to bottom 
var opx = this.target.style.marginTop.split("px")[0]; 
var pxstep = Math.round((this.height / this.step)+0.5); 
var npx = Number(opx) + Number(pxstep); 
if (npx>0){this.target.style.marginTop = '0px';}else{this.target.style.marginTop = String(npx) + 'px';} 
break; 
case 3: //right to left 
var opx = this.target.style.marginRight.split("px")[0]; 
var pxstep = Math.round((this.width / this.step)+0.5); 
var npx = Number(opx) + Number(pxstep); 
if (npx>0){this.target.style.marginRight = '0px';}else{this.target.style.marginRight = String(npx) + 'px';} 
break; 
} 
this.i++ //计数器+1 
if (this.i>(this.step-1)){window.clearInterval(this.intervalid);this.i=0;this.status=1;} //循环完毕，清除循环定时 
} 
slider.prototype.decycle = function() //单步循环动作 
{ 
var opa = this.target.style.filter.split("=")[1].split(")")[0]//获取目标div的透明度数值 
var opastep = Math.round(((100 - Number(opa)) / this.step)+2.5)*2;//计算每步增加的透明度 
var nopa = Number(opa) - Number(opastep);//当前透明度 
if (nopa<this.startopa){this.target.style.filter = 'Alpha(opacity=' + this.startopa + ')';}else{this.target.style.filter = 'Alpha(opacity=' + String(nopa) + ')';}//给div透明度赋值 
switch(this.direction)//根据弹出方向计算和设定div的动作 
{ 
case 1: //left to right 
var opx = this.target.style.marginLeft.split("px")[0]; 
var pxstep = Math.round((this.width / Math.round(this.step*0.5))+0.5); 
var npx = Number(opx) - Number(pxstep); 
if (Math.abs(npx)>this.width+2){this.target.style.marginLeft = '-' + this.width + 'px';}else{this.target.style.marginLeft = String(npx) + 'px';} 
break; 
case 2: //top to bottom 
var opx = this.target.style.marginTop.split("px")[0]; 
var pxstep = Math.round((this.height / Math.round(this.step*0.5))+0.5); 
var npx = Number(opx) - Number(pxstep); 
if (Math.abs(npx)>this.height+2){this.target.style.marginTop = '-' + this.height + 'px';}else{this.target.style.marginTop = String(npx) + 'px';} 
break; 
case 3: //right to left 
var opx = this.target.style.marginRight.split("px")[0]; 
var pxstep = Math.round((this.width / Math.round(this.step*0.5))+0.5); 
var npx = Number(opx) - Number(pxstep); 
if (Math.abs(npx)>this.width+2){this.target.style.marginRight = '-' + this.width + 'px';}else{this.target.style.marginRight = String(npx) + 'px';} 
break; 
} 
this.i++ //计数器+1 
if (this.i>(Math.round(this.step*0.5)-1)){window.clearInterval(this.intervalid);this.i=0;this.status=0;this.target.style.display = "none";} //循环完毕，清除循环定时 
}