Hi all,

I am trying to do a drop down menu that passes the seleced value to some code and does a calculation with it. I can do this fine however the problem is when the page loads. it loads with error I think this is becaue no value is being passed but I cant think of way to fix this problem..

Notice: Undefined index: TicketNumber in C:\wamp\www\Tic.php on line 89

PHP Code:

  <form id="form" name="form" method="post" action="">
     <p>
       <label for="TicketNumber">Number of Tickets:</label>
       <select name="TicketNumber" onchange="this.form.submit()" id="TicketNumber">
       <option value="0">0</option>
         <option value="1">1</option>
         <option value="2">2</option>
         <option value="3">3</option>
         <option value="4">4</option>
         <option value="5">5</option>
       </select>
<label for='Title2'></label>
    <?php 
    
      $price = 30;
      $total = $_POST['TicketNumber'] * $price;
      echo "<P> The total cost of tickets will come to"." "."£"."$total</P>";
    
      ?>
     </p>
    </form>

Thanks in advance :P

check the value exists, if it does run the code, if not. ... don't.

Hi thanks Chrishirst, I got this sorted but I have another problem maybe you can help? becasue I am using the onchange="this.form.submit() I need to have a button when the user is happy they can go to the next screen but I need to be able to $_POST['TicketNumber'] so I can then use this value in for loop to generate name boxes thanks.

p.s I am gonna need this vale on a lot of pages as it will be used to generate contenets based on how many tickets they want is there a better way to do this?

Pass the value in a form, a session variable, or a cookie.