mysql php无刷新三级联动菜单_PHP教程

$sql="select * from ptypes where sid = 0 and ssid =0";
$result=mysql教程_query($sql,$conn) or die("查询数据库教程出错1");
while($row=mysql_fetch_object($result))
{
$i=0;
$rs2="";
$sql2="select * from ptypes where sid='".$row->id."'";
$result2=mysql_query($sql2,$conn) or die("查询数据出错2");
while($row2=mysql_fetch_object($result2))
{
if ($i==0){
$t="";
}else{
$t=",";
}
$rs2.=$t."{txt:'".$row2->title."',val:'".$row2->id."'}n";
$n=0;
$rs3="";
$sql3="select * from ptypes where ssid='".$row2->id."'";
$result3=mysql_query($sql3,$conn) or die("查询是数据库出错3");
while($row3=mysql_fetch_object($result3))
{
if ($n==0)
{
$t1="";
}else{
$t1=",";
}
$rs3.=$t1."{txt:'".$row3->title."',val:'".$row3->id."'}n";
$n=1;
}

echo("sidArr['".$row2->id."']=[".$rs3."];");
$i=1;
}

echo("sidArr['".$row->id."']=[".$rs2."];");
}
?>
function setCity(province) {

removeOptions(document.getElementById('sid'));
removeOptions(document.getElementById('ssid'));
setSelectOption('sid', "", '-请选择-');
setSelectOption('ssid', "", '-请选择-');
if (!sidArr[province] || sidArr[province]==""){

document.getElementById('sid').disabled=true;
document.getElementById('ssid').disabled=true;
}else{
document.getElementById('sid').disabled=false;
document.getElementById('ssid').disabled=false;
setSelectOption('sid', sidArr[province], '-请选择-');
}
}
function setssid(province) {
removeOptions(document.getElementById('ssid'));
setSelectOption('ssid', "", '-请选择-');
if (!sidArr[province] || sidArr[province]==""){
document.getElementById('ssid').disabled=true;
}else{
document.getElementById('ssid').disabled=false;
setSelectOption('ssid', sidArr[province], '-请选择-');
}
}

-请选择-
$sql="select * from ptypes where sid=0 and ssid = 0";
$result=mysql_query($sql,$conn) or die("返回数据记录出错!");
while($row=mysql_fetch_object($result))
{
echo ("".$row->title."");
}
?>
一级


-请选择-
二级

-请选择-
三级