php 实现两个select下拉框的数据联动

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 $access_id  = "root";
 $access_pwd = "831025";
 $db_name    = "inv";
 @ $db = mysql_connect('localhost', $access_id, $access_pwd) or
  die("Could not connect to database. Please contact with IT supporting team ASAP.");
 mysql_query("SET NAMES 'GBK'");
 mysql_select_db($db_name);
?>

 

 
  
   
    
     
     
   
    
   
  

Plant:

echo '---Please Select---';      $plants_sql = "SELECT plant_id,plant_desc FROM plant WHERE plant_act = '1' ";      $plants_res  = mysql_query($plants_sql);            $plant_sql  = "SELECT plant_id,plant_desc FROM plant WHERE plant_id='".$_POST['role_plant']."' ";      $plant_res  = mysql_query($plant_sql);            $plant_row  = mysql_fetch_array($plant_res);            while($plants_row = mysql_fetch_array($plants_res)){          if ($plant_row['plant_id'] == $plants_row['plant_id']){        echo ' '.$plants_row['plant_id'].' - '.$plants_row['plant_desc'];       }else{        echo ' '.$plants_row['plant_id'].' - '.$plants_row['plant_desc'];       }      }     ?>

Role:

echo'---Please Select---';     $roles_sql = "SELECT * FROM sys_role WHERE role_plant='".$_POST['role_plant']."' and role_act='1'";     $roles_res = mysql_query($roles_sql);           $role_sql  = "SELECT * FROM sys_role WHERE role_id='".$_POST['role_id']."' and role_act='1' ";     $role_res  = mysql_query($role_sql);          $role_row  = mysql_fetch_array($role_res);          while($roles_row=mysql_fetch_array($roles_res)){      if($role_row['role_id']==$roles_row['role_id']){       echo "".$roles_row['role_id']." - ".$roles_row['role_name'];      }else{       echo "".$roles_row['role_id']." - ".$roles_row['role_name'];      }     }         ?>