带CHECKBOX的树型目录求助!为什么点击某个第N层次的节点会执行N次ONMOUSEOVER函数?

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2004-09-28 02:20:11

<HTML>
<HEAD>
<TITLE> emu's test of simple tree</TITLE>
<SCRIPT LANGUAGE="JavaScript">
var head="display:''"
img_close=new Image()
img_close.src="/sysManage/images/f.gif"
img_open=new Image()
img_open.src="/sysManage/images/fo.gif"
img3=new Image()
img3.src="/sysManage/images/e.gif";

var elment = img_close.src;
function checkSelect()
{
var elm = event.srcElement.parentNode;
checkChildrenRecurve(elm);
checkRootRecurve(document.getElementById("root"));
}
function checkChildrenRecurve(elm)
{
var li = elm.parentNode;
var ul = li.lastChild;
if (ul.tagName != "UL") return;
var lis = ul.children;
for (var i=0;i<lis.length;i++)
{
lis[i].firstChild.firstChild.checked=elm.firstChild.checked;
checkChildrenRecurve(lis[i].firstChild)
}
}
function checkRootRecurve(ul)
{
if (ul.tagName != "UL")
{
ul.parentNode.firstChild.firstChild.allChecked = ul.parentNode.firstChild.firstChild.checked;
ul.parentNode.firstChild.firstChild.allUnChecked = !ul.parentNode.firstChild.firstChild.checked;
return;
}
var lis = ul.children;
var allChecked = true;
var allUnChecked = true;
for (var i=0;i<lis.length;i++)
{
checkRootRecurve(lis[i].lastChild);
allChecked = allChecked && lis[i].firstChild.firstChild.checked && lis[i].firstChild.firstChild.allChecked;
allUnChecked = allUnChecked && !lis[i].firstChild.firstChild.checked && lis[i].firstChild.firstChild.allUnChecked;
}
ul.parentNode.firstChild.firstChild.allChecked=allChecked;
ul.parentNode.firstChild.firstChild.allUnChecked=allUnChecked;
if (allChecked || allUnChecked)
{
ul.parentNode.firstChild.firstChild.checked=allChecked;
ul.parentNode.firstChild.firstChild.disabled=false;
ul.parentNode.firstChild.childStatus=false;
}
else
{
ul.parentNode.firstChild.firstChild.disabled=true;
ul.parentNode.firstChild.childStatus=true;
ul.parentNode.firstChild.firstChild.checked=true;

}
}

function enableFirstChild()
{
this.childStatus = this.firstChild.disabled;
this.firstChild.disabled=false;
}
function recoverFirstChild()
{
this.firstChild.disabled = this.childStatus;
}
function init()
{
var elms = document.getElementsByTagName("INPUT");
for (var i=0;i<elms.length;i++)
elms[i].onclick=checkSelect;
var elms = document.getElementsByTagName("SPAN");
for (var i=0;i<elms.length;i++)
{
elms[i].onmouseover=enableFirstChild;
elms[i].onmouseout=recoverFirstChild;
}
var elms = document.getElementsByTagName("LI");
for (var i=0;i<elms.length;i++)
elms[i].onclick=onMouseDown;
}
function onMouseDown()
{
if(!document.all)return;
var eventObj = event.srcElement;

if(eventObj.tagName=="LI")
{
//判断是否存在子节点

var sSrc = eventObj.style.listStyleImage;
//alert(sSrc);
//alert(eventObj.innerHTML);
//alert(eventObj.outerHTML);
if(sSrc.indexOf("e.gif") >= 0)return;
if(sSrc.indexOf("f.gif") < 0)return;
//if(sSrc.indexOf("f.gif") < 0 && sSrc.indexOf("fo.gif")<0)return;
var nOffIndex = 3;
var srcIndex = eventObj.sourceIndex;
var nested = document.all[srcIndex + nOffIndex];

if(nested.tagName!="UL")
{
nested = document.all[srcIndex + 1];
}

if (nested.style.display=="none")
{
nested.style.display="block";
eventObj.style.listStyleImage = "url(fo.gif)";
}
else
{
nested.style.display="none";
eventObj.style.listStyleImage = "url(f.gif)";
}
}
else if(eventObj.tagName == "input" )
{//相应节点的点击
alert("test");
// var nChnlId = parseInt(eventObj.name);
// if(!isNaN(nChnlId))
// {
// onClickChannel(nChnlId);
// }
}
}

</SCRIPT>
<style TYPE="text/css">
LI {list-style-image:URL(e.gif)}
#DIRECTORY{list-style-image:URL(f.gif)}
</style>
</HEAD>

<BODY onload="init()">
<div>
<span><input type=checkbox></span>0
<UL id=root>
<LI style="list-style-image:URL(f.gif)"><span><input type=checkbox></span>1
<UL style="display:none">
<LI style="list-style-image:URL(f.gif)"><span><input type=checkbox></span>11
<UL style="display:none">
<LI style="list-style-image:URL(f.gif)"><span><input type=checkbox></span>111
<UL style="display:none">
<LI><span><input type=checkbox></span>1111
<LI><span><input type=checkbox></span>1112
</UL>
<LI><span><input type=checkbox></span>112
</UL>
<LI style="list-style-image:URL(f.gif)"><span><input type=checkbox></span>12
<UL style="display:none">
<LI><span><input type=checkbox></span>121
<LI><span><input type=checkbox></span>122
</UL>
</UL>
</UL>
</div>
</body>
</html>

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