Question

I need help on my php, I don’t know how to do this but what I want is the user to enter in a room number in a textbox and when the user submits the form, if the room number is not in the database then it should display a message stating room is invalid. Does anyone know if this is possible?

Below is relevant code:

Javascript code for validation:

         function validation() {

           var isDataValid = true;

        var roomTextO = document.getElementById("room"); 

    //this retrieves an element from the textbox where user enters in a room number

        var errRoomMsgO = document.getElementById("roomAlert");

     // this is where the alert message appears for validation



   if (roomTextO.value == ""){
          errRoomMsgO.innerHTML = "Please Enter in a Room Number";
          isDataValid = false;
        }else if (!trimmedRoomText.length){
          errRoomMsgO.innerHTML = "Please Enter in a Room Number"; 
          isDataValid = false;      
    }else{
                errRoomMsgO.innerHTML = ""; 
        }

        }

Below is relevant SQL where room numbers are stored in database:

<?php

    $roomresult = mysql_query( "SELECT Room FROM Room" );

?>

The name of the Table is “Room” and the Room numbers are stored under the field “Room”.

Below is the textbox where user enters in room number:

<p><strong>Room:</strong> <input type="text" id="room" name="roomChosen" /><br/><span id="roomAlert"></span></p>      <!-- Enter Room here-->   

Answer 1

Well you need to select by the room_id (or some other criteria[s] that will deliver a unique result) basic sql, really…

$roomresult = mysql_query( "SELECT Room FROM Room WHERE Room_Id = " . (int) $_POST['roomChosen']);