--------------------------------html------------------------------------------------------
<html>
<head>
<meta http-equiv="Content-Type" c>
<title>无标题文档</title>
<script language="javascript">
var ajax=false;
function initAjax()
{
ajax = false;
if(window.XMLHttpRequest)
{ ajax = new XMLHttpRequest();}
else
if (window.ActiveXObject)
{
try {ajax = new ActiveXObject("Msxml2.XMLHTTP"); }
catch (e)
{
try {ajax = new ActiveXObject("Microsoft.XMLHTTP");}
catch (e) {}
}
}
if (!ajax)
{
window.alert("不能创建XMLHttpRequest对象实例");
return false;
}
}
//-------------
function fill()
{
initAjax();
ajax.onreadystatechange=fillcity;
ajax.open("get","test.php?cityid=all",true);
ajax.send(null);
}
function fillcity()
{
if(ajax.readyState==4)
if(ajax.status==200)
{splitcity(ajax.responseText); }
else
{alert('no data come back');}
}
function splitcity(rs)
{
document.form1.city.length=0;
var field=rs.split(';');
for(var i=0;i<field.length;i++)
{
var subfield=field;
var op=subfield.split(",");
if(op[0]!='')
document.form1.city.add(new Option(op[0],op[1]));
}
}
//--------------
function changetown()
{
initAjax();
ajax.onreadystatechange=filltown;
var myurl="test.php?cityid="+document.form1.city.value;
ajax.open("get",myurl,true);
ajax.send(null);
}
function filltown()
{
var ob='town';
if(ajax.readyState==4)
if(ajax.status==200)
{splittown(ajax.responseText); }
else
{alert('no data come back');}
}
function splittown(rs)
{
document.form1.town.length=0;
var field=rs.split(';');
for(var i=0;i<field.length;i++)
{
var subfield=field;
var op=subfield.split(",");
if(op[0]!='')
document.form1.town.add(new Option(op[0],op[1]));
}
}
//-------------
</script>
</head>
<body>
<form name="form1" action="" method="get">
<table width="200" border="0" cellspacing="0" cellpadding="0">
<tr>
<td height="20">City:<select name="city" style="width=100;" ></select></td>
</tr>
<tr></tr><tr></tr><tr></tr><tr></tr><tr></tr><tr></tr><tr></tr>
<tr>
<td height="20">Town:<select name="town" style="width=100;"></select></td>
</tr>
</table>
</form>
</body>
</html>
---------------------------------------------php--------------------------------------------------
<?php
header('Content-Type:text/html;charset=GB2312');
include_once("conn.php");//数据库连接
$id=$_GET['cityid'];
if($id=='all')
{
$sql="select id,cityname from city";
$query=mysql_query($sql);
if(@mysql_num_rows($query)>0)
{
while ( $row = mysql_fetch_array($query) )
echo( $row['cityname'].','.$row['id'].';' );
}
}
else
{
if(empty($id))
$sql="select id ,townname from town ";
else
$sql="select townname,id from town where cityid=".$id;
$query=mysql_query($sql);
if(mysql_num_rows($query)>0)
{
while ( $row = mysql_fetch_array($query) )
print($row['townname'].','.$row['id'].';');
}
}
?>
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