动态增加的dropdownlist如何保持状态，下面就是解决方法。
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<![CDATA[<%@ page language="c#" enableviewstate="true"%><br />
<html><br />
<head><br />
<meta http-equiv="content-type" content="text/html; charset=gb2312"><br />
<title>院系选择</title><br />
<script language="c#" runat=server>
public void page_load(object sender, eventargs e)
{
xike.attributes.add("onchange",
"document.all." + hiddenvalue.clientid + ".value = xike.options[xike.selectedindex].value;");
if(!page.ispostback)
{
xike.items.add("01-1系");
xike.items.add("01-2系");
xike.items.add("01-3系");
xike.items.add("01-4系");
xike.items.add("01-5系");
}
}
public void selchange(object sender, eventargs e)
{
switch(xueyuan.selecteditem.value)
{
case "01" :
xike.items.clear();
xike.items.add("01-1系");
xike.items.add("01-2系");
xike.items.add("01-3系");
xike.items.add("01-4系");
xike.items.add("01-5系");
break;
case "02" :
xike.items.clear();
xike.items.add("02-1系");
xike.items.add("02-2系");
xike.items.add("02-3系");
xike.items.add("02-4系");
break;
case "03" :
xike.items.clear();
xike.items.add("03-1系");
xike.items.add("03-2系");
xike.items.add("03-3系");
break;
case "04" :
xike.items.clear();
xike.items.add("04-1系");
xike.items.add("04-2系");
break;
case "05" :
xike.items.clear();
xike.items.add("05-1系");
xike.items.add("05-2系");
xike.items.add("05-3系");
xike.items.add("05-4系");
xike.items.add("05-5系");
break;
case "06" :
xike.items.clear();
xike.items.add("数学系");
xike.items.add("计算数学系");
xike.items.add("计算机科学系");
xike.items.add("信息工程系");
xike.items.add("金融数学系");
xike.items.add("计算中心");
xike.items.add("大学数学教研部");
break;
}
}
public void selresult(object sender, eventargs e)
{
label1.text="你选择了:" + xueyuan.selecteditem.text +" : "+ hiddenvalue.value ;
for (int i=0; i<xike.items.count; i++) {
if (xike.items[i].value == hiddenvalue.value)
xike.items[i].selected = true;
}
}
</script><br />
</head><br />
<body></p>
<form runat="server">
学院:<br />
<<a href="http://www.west999.com/www/go/?url=http://www.chinaitpower.com/dev/web/asp/index.html" target="_blank" rel="nofollow" >asp</a>:dropdownlist id="xueyuan" runat="server" autopostback="true"<br />
onselectedindexchanged="selchange" ><br />
<<a href="http://www.west999.com/www/go/?url=http://www.chinaitpower.com/dev/web/asp/index.html" target="_blank" rel="nofollow" >asp</a>:listitem value="01" selected>1 文学院</<a href="http://www.west999.com/www/go/?url=http://www.chinaitpower.com/dev/web/asp/index.html" target="_blank" rel="nofollow" >asp</a>:listitem><br />
<<a href="http://www.west999.com/www/go/?url=http://www.chinaitpower.com/dev/web/asp/index.html" target="_blank" rel="nofollow" >asp</a>:listitem value="02">2 社发院</<a href="http://www.west999.com/www/go/?url=http://www.chinaitpower.com/dev/web/asp/index.html" target="_blank" rel="nofollow" >asp</a>:listitem><br />
<<a href="http://www.west999.com/www/go/?url=http://www.chinaitpower.com/dev/web/asp/index.html" target="_blank" rel="nofollow" >asp</a>:listitem value="03">3 管理院</<a href="http://www.west999.com/www/go/?url=http://www.chinaitpower.com/dev/web/asp/index.html" target="_blank" rel="nofollow" >asp</a>:listitem><br />
<<a href="http://www.west999.com/www/go/?url=http://www.chinaitpower.com/dev/web/asp/index.html" target="_blank" rel="nofollow" >asp</a>:listitem value="04">4 教科院</<a href="http://www.west999.com/www/go/?url=http://www.chinaitpower.com/dev/web/asp/index.html" target="_blank" rel="nofollow" >asp</a>:listitem><br />
<<a href="http://www.west999.com/www/go/?url=http://www.chinaitpower.com/dev/web/asp/index.html" target="_blank" rel="nofollow" >asp</a>:listitem value="05">5 外文院</<a href="http://www.west999.com/www/go/?url=http://www.chinaitpower.com/dev/web/asp/index.html" target="_blank" rel="nofollow" >asp</a>:listitem><br />
<<a href="http://www.west999.com/www/go/?url=http://www.chinaitpower.com/dev/web/asp/index.html" target="_blank" rel="nofollow" >asp</a>:listitem value="06">6 数科院</<a href="http://www.west999.com/www/go/?url=http://www.chinaitpower.com/dev/web/asp/index.html" target="_blank" rel="nofollow" >asp</a>:listitem><br />
</<a href="http://www.west999.com/www/go/?url=http://www.chinaitpower.com/dev/web/asp/index.html" target="_blank" rel="nofollow" >asp</a>:dropdownlist><br />
系科:<br />
<<a href="http://www.west999.com/www/go/?url=http://www.chinaitpower.com/dev/web/asp/index.html" target="_blank" rel="nofollow" >asp</a>:dropdownlist id="xike" runat="server" autopostback="true"<br />
onselectedindexchanged="selresult"/><br />
<<a href="http://www.west999.com/www/go/?url=http://www.chinaitpower.com/dev/web/asp/index.html" target="_blank" rel="nofollow" >asp</a>:label id="label1" runat="server" /><br />
<input id="hiddenvalue" type=hidden value="" runat=server><br />
</form>
<p></body><br />
</html><br />
]]>
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