基本功训练:)
<body>
<script language="JavaScript">
var o = {
'A':['A1','A2','A3','A4','A5'],
'B':['B1','B2','B3','B4','B5'],
'C':['C1','C2','C3','C4','C5']
};function window.onload()
{
var key;
for (key in o)
{
AddOption(sel1,key,key);
}
dynamicload(sel1.value);
}function dynamicload(item)
{
sel2.length=0;
for (var i=0; i<o[item].length; i++)
{
AddOption(sel2,o[item][i],o[item][i]);
}
}function AddOption(AddField,OptionText,OptionVal)
{//向指定select域AddField，插入Option对象
NewOption = new Option(OptionText, OptionVal);
AddField.options[AddField.length]=NewOption;
}
</script>
<select id="sel1" style="width:100" onchange="dynamicload(this.value)">
</select>
<hr>
<select id="sel2" style="width:100">
</select>
</body>
<body>
<script language="JavaScript">
var o = {
'A':['A1','A2','A3','A4','A5'],
'B':['B1','B2','B3','B4','B5'],
'C':['C1','C2','C3','C4','C5']
};function window.onload()
{
var key;
for (key in o)
{
AddOption(sel1,key,key);
}
dynamicload(sel1.value);
}function dynamicload(item)
{
sel2.length=0;
for (var i=0; i<o[item].length; i++)
{
AddOption(sel2,o[item][i],o[item][i]);
}
}function AddOption(AddField,OptionText,OptionVal)
{//向指定select域AddField，插入Option对象
NewOption = new Option(OptionText, OptionVal);
AddField.options[AddField.length]=NewOption;
}
</script>
<select id="sel1" style="width:100" onchange="dynamicload(this.value)">
</select>
<hr>
<select id="sel2" style="width:100">
</select>
</body>
总共有200多
我是想要直接从SQL里出来啊
也可能用xmlhttp做无刷新：
客户端这样
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
</head>
<script language="JavaScript">
function GetResult(str)
{
var oBao = new ActiveXObject("Microsoft.XMLHTTP");
oBao.open("POST","select.php?sel="+str,false);
oBao.send();
//服务器端处理返回的是经过escape编码的字符串.
//通过XMLHTTP返回数据,开始构建Select.
BuildSel(unescape(oBao.responseText),document.all.sel2);
}function BuildSel(str,sel)
{
//先清空原来的数据.
sel.options.length=0;
var arrstr = new Array();
arrstr = str.split(",");
//开始构建新的Select.
for(var i=0;i<arrstr.length;i++)
{
sel.options[sel.options.length]=new Option(arrstr[i],arrstr[i])
}
}
</script>
<select name="sel" onChange="GetResult(this.value)">
<option value="">请选择
<option value="福建省">福建省
<option value="湖北省">湖北省
<option value="辽宁省">辽宁省
<select>
<select name="sel2"></select>
</html>
建个数据库，服务器端（asp,php等）把数据读出来再response.write或echo出来就好了
->
也可以用xmlhttp做无刷新笔误
<script language="JavaScript">
var o = {
'A':['A1','A2','A3','A4','A5'],
'B':['B1','B2','B3','B4','B5'],
'C':['C1','C2','C3','C4','C5']
};function checkrado(oRdo)
{
if (oRdo.checked)
{
dynamicload(oRdo.value);
}
}function window.onload()
{
var oRdo = document.getElementsByName('rdo');
for (var i=0; i<oRdo.length; i++)
{
if (oRdo[i].checked)
{
dynamicload(oRdo[i].value);
break;
}
}
}function dynamicload(item)
{
sel2.length=0;
for (var i=0; i<o[item].length; i++)
{
AddOption(sel2,o[item][i],o[item][i]);
}
}function AddOption(AddField,OptionText,OptionVal)
{//向指定select域AddField，插入Option对象
NewOption = new Option(OptionText, OptionVal);
AddField.options[AddField.length]=NewOption;
}
</script>
A <input type="radio" name="rdo" value="A" onclick="checkrado(this)" checked><br>
B <input type="radio" name="rdo" value="B" onclick="checkrado(this)"><br>
C <input type="radio" name="rdo" value="C" onclick="checkrado(this)">
<hr>
<select id="sel2" style="width:100">
</select>
</body>