test.php
<?if(array_key_exists("firstID",$_POST)) $firstID=$_POST['firstID'];
elseif(array_key_exists("firstID",$_GET)) $page=$_GET['firstID'];
else $firstID= "";
$conn = mysql_pconnect(DB_SERVER,USERNAME,PASSWD);
$opened = mysql_select_db(DB_NAME,$conn);
if(!$opened) echo ("Open Database ".DB_NAME." Error");
echo "<select name=\"first\" onchange="Jump('test.php')">
$sql = "select id,fname,user from fdb";
$resultselect = mysql_query($sql,$conn);
while($row = mysql_fetch_array($resultselect)){
echo "<option value='".$row["id"]."'>".$row["fname"]."</option>";
}</select>
echo "<select name=\"second\">";
$sql="select id,sname from sdb where parentid=$firstID";
$resultselect = mysql_query($sql,$conn);
while($row = mysql_fetch_array($resultselect)){
echo "<option value='".$row["id"]."'>".$row["sname"]."</option>";
}
echo "</select>";?>
<script language=javascript>
function Jump(url){
var val = document.all.first.value;
var linkurl = url + "&firstID=" + val;
document.location.href=linkurl ;
}
</script>
<?if(array_key_exists("firstID",$_POST)) $firstID=$_POST['firstID'];
elseif(array_key_exists("firstID",$_GET)) $page=$_GET['firstID'];
else $firstID= "";
$conn = mysql_pconnect(DB_SERVER,USERNAME,PASSWD);
$opened = mysql_select_db(DB_NAME,$conn);
if(!$opened) echo ("Open Database ".DB_NAME." Error");
echo "<select name=\"first\" onchange="Jump('test.php')">
$sql = "select id,fname,user from fdb";
$resultselect = mysql_query($sql,$conn);
while($row = mysql_fetch_array($resultselect)){
echo "<option value='".$row["id"]."'>".$row["fname"]."</option>";
}</select>
echo "<select name=\"second\">";
$sql="select id,sname from sdb where parentid=$firstID";
$resultselect = mysql_query($sql,$conn);
while($row = mysql_fetch_array($resultselect)){
echo "<option value='".$row["id"]."'>".$row["sname"]."</option>";
}
echo "</select>";?>
<script language=javascript>
function Jump(url){
var val = document.all.first.value;
var linkurl = url + "&firstID=" + val;
document.location.href=linkurl ;
}
</script>
var val = document.all.first.value;
first指得什么?