Javascript实现div的toggle效果实例分析

本文实例讲述了Javascript实现div的toggle效果。分享给大家供大家参考。具体分析如下：

<script type="text/javascript" language="javascript">  function $(obj)  {  return document.getElementById(obj);  }  function ToggleDiv()  {  this.ToggleId='silder'; //被伸缩的对象ID  this.ParentId='container'; //被伸缩的对象的父ID  this.minHeight=1; //最小高度  this.maxHeight=200; //最大高度  this.speed=1; //伸缩速度  this.offset=0.15; //偏移量  this.load=function()  {   if($(this.ToggleId).style.display=='none') //如果是隐藏的就打开   {    StartToggle('open',this.ToggleId,this.ParentId,this.minHeight,this.maxHeight,this.speed,this.offset);   }   else //如果是打开的就隐藏   {     StartToggle('close',this.ToggleId,this.ParentId,this.minHeight,this.maxHeight,this.speed,this.offset);   }  }  }  function StartToggle(method,toggleid,parentid,minheight,maxheight,speed,offset)  {  if(typeof(method)!='string' || method.toLowerCase()=='')  {   method='open';  }  if(method.toLowerCase()=='open')  {   var addspeed=speed+offset;   var openfun=function()   {    var originheight=$(toggleid).offsetHeight==0?1:$(toggleid).offsetHeight;    var newheight=originheight+addspeed;    addspeed=addspeed+offset;    if(parseInt(newheight)<parseInt(maxheight))    {         $(toggleid).style.height=newheight+'px';     $(toggleid).style.display='block';    }    else if(parseInt(newheight)>=parseInt(maxheight))    {     $(toggleid).style.height=maxheight+'px';     $(toggleid).style.display='block';     $(parentid).innerHTML='收缩';     window.clearInterval(addtimer);    }   }   var addtimer=window.setInterval(openfun,100);  }  else if(method.toLowerCase()=='close')  {   var addspeed=speed+offset;   var reducefunction=function()   {    var originheight=$(toggleid).offsetHeight;    var newheight=originheight-addspeed;    addspeed=addspeed+offset;    if(parseInt(newheight)>parseInt(minheight))    {     $(toggleid).style.height=newheight+'px';     $(toggleid).style.display='block';    }    else    {     $(toggleid).style.display='none';     $(toggleid).style.height='1px';     $(parentid).innerHTML='展开';     window.clearInterval(reducetimer);    }   }   var reducetimer=window.setInterval(reducefunction,100);  }  }  function DoToggle(obj1,obj2)  {  var tog=new ToggleDiv();  tog.ToggleId=obj1;  tog.ParentId=obj2;  tog.minHeight=5;  tog.maxHeight=110;  tog.speed=10;  tog.offset=3;  tog.load();  }</script>

用法示例如下：

<div style="border:1px dashed blue;width:200px;">  <h2 id="container" onclick="javascript:DoToggle('silder',this.id);" onmouseover="this.style.cursor='pointer';">展开</h2>  <div id="silder" style="display:none">  伸缩效果<br />  伸缩效果<br />  伸缩效果<br />  伸缩效果<br />伸缩效果<br />  伸缩效果<br />  </div></div>