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Thread: problem with calculation

  1. #1
    Join Date
    Nov 2010
    Posts
    10

    problem with calculation

    i have these 2 selections
    Code:
        <select id="rooms" name="rooms">
      <option>Please Choose</option>
      <option value="1" >1</option>
      <option value="2" >2</option>
      <option value="3" >3</option>
      <option value="4" >4</option>
       </select>
    
          <select id="type" name="type">
    
      <option>Please Choose</option>
      <option>Single - 50</option>
      <option>Double - 60</option>
      <option>Luxury double - 70</option>
      </select>
    i would like to give these values
    single:50
    double:60
    luxury double:70
    1)how can i do that?
    2)if i choose for example single room and number of rooms 2 how can i have the result 100?

    Thank you

  2. #2
    Join Date
    Oct 2005
    Location
    Cambridgeshire, UK
    Posts
    191
    Maybe something like so will work:

    HTML Code:
    <script type="text/javascript">
      function calculate_total() {
    
        var no_rooms = document.getElementById('rooms').value;
        var room_type = document.getElementById('type').value;
        var total = 0;
    
        if (no_rooms!="" && room_type!="") { // if both dropdowns contain values
          total = parseInt(no_rooms) * parseInt(room_type);
        }
    
        document.getElementById('current_total').innerHTML = total;
    
      }
    </script>
    
    Number of Rooms:
    <select id="rooms" name="rooms" onchange="calculate_total()">
      <option value="">Please Choose</option>
      <option value="1" >1</option>
      <option value="2" >2</option>
      <option value="3" >3</option>
      <option value="4" >4</option>
    </select>
    <br />
    Room Type:
    <select id="type" name="type" onchange="calculate_total()">
      <option value="">Please Choose</option>
      <option value="50">Single - 50&#163;</option>
      <option value="60">Double - 60&#163;</option>
      <option value="70">Luxury double - 70&#163;</option>
    </select>
    
    Current Total: <span id="current_total"></span>
    I haven't tested that but hopefully it gets you started. Notice how on the change of each dropdown we calculate the total by multiplying the two dropdown values together.
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  3. #3
    Join Date
    Nov 2010
    Posts
    10
    thank you very much for your help.This works nice...I would like to ask you something else..
    i create a new selection with the number of people.
    I want to do this:
    If a single person books a double room a single-occupancy supplement should be charged. For example
    Double room with shower and WC:
    If 2 people sharing, price per person per night, &#163;60.
    If 1 person only - &#163;90 per night.

    HTML Code:
    <script type="text/javascript">
      function calculate_total() {
        
        var no_people = document.getElementById('people').value;
        var no_rooms = document.getElementById('rooms').value;
        var room_type = document.getElementById('type').value;
        var total = 0;
    
        if (no_rooms!="" && room_type!="" && breakf!="" && no_people!="1" ) 
    { // if both dropdowns contain values
          total = parseInt(no_rooms) * parseInt(room_type) + parseInt(breakf);
        }
    else
    {
         total = parseInt(no_rooms) * parseInt(room_type) + parseInt(breakf)+10;
    }
        document.getElementById('current_total').innerHTML = total;
    
      }
    </script>
    
     Number of people
     <br>
             <select id="people" name="people" >
        <option value="">Please Choose</option>
        <option value="1" >1</option>
        <option value="2" >2</option>
        <option value="3" >3</option>
        <option value="4" >4</option>
        </select>
    
             </br>
    
    Number of Rooms:
    <select id="rooms" name="rooms" onchange="calculate_total()">
      <option value="">Please Choose</option>
      <option value="1" >1</option>
      <option value="2" >2</option>
      <option value="3" >3</option>
      <option value="4" >4</option>
    </select>
    <br />
    Room Type:
    <select id="type" name="type" onchange="calculate_total()">
      <option value="">Please Choose</option>
      <option value="50">Single - 50&#163;</option>
      <option value="60">Double - 60&#163;</option>
      <option value="70">Luxury double - 70&#163;</option>
    </select>
    
    Current Total: <span id="current_total"></span>
    The result does not change!!!Somewhere in IF i think that is my fault.Could you please help me?
    Last edited by theo1985; 11-20-2010 at 12:59 PM.

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