ComboBox dapat dibuat langsung action, artinya ketika dipilih langsung memberikan respon tanpa harus menekan tombol submit.Misalnya pada pembuatan jump menu dan filterasi.
combolangsung.php
mysql_connect("localhost","root","pajarmaning");
mysql_select_db("dbphp");
echo "<form method=get action=$_SERVER[PHP_SELF]>";
echo "Fakultas : <select name='jurusan' onChange='this.form.submit()'>";
echo "<option value=0 selected>- Pilih Jurusan -</option>";
$sql=mysql_query("select * from jurusan");
while ($data=mysql_fetch_array($sql)){
if ($data[id_jur]==$_GET[jurusan])
echo "<option value=$data[id_jur] selected>$data[nama_jur]</option>";
else
echo "<option value=$data[id_jur]>$data[nama_jur]</option>";
}
echo "</select></form>";
if (isset($_GET[jurusan])){
echo "Program Studi : <br>";
$sql2=mysql_query("select * from prodi where id_jur='$_GET[jurusan]'");
while ($row=mysql_fetch_array($sql2)){
echo "$row[nama]<br>";
}
}
?>
Download script
