if else bug and calculate interest funtion help me plz

[bazzano]

Hi guys im trying to work out the interest if the user entered a price and a quantity then depending on what radio button they select it then adds interest onto the total cost.

I tried using if else statements as well and it would only calculate the cost and would not attemp to try the other if statements even though i selected the different radio buttons. There is a few bugs could someone help me out please

cash it add 5$
credit adds 1.5 % onto the total cost
cheque adds 2 dollars

where have i gone wrong

thanks

For example

cost qty
6000 * 1 /100 *1.5 interest how would i add that result onto the
running total

Code: Select all

function caculateOrder(form)
{

  var total = form.total.value;
  var qty = form.qty.value;
  var price = form.price.value;
  var radio1 = form.cash.value;
  var radio2 = form.credit.value;
  var radio3 = form.cheque.value;
  var interest;
  
  
  if(qty !="" && price !="")
  {
  
    alert("Warning calculating the total cost!");
  
    if(document.orderform.rad[0])
    {
       form.total.value = ((qty * price)) + 5;
       document.write("You have chosen cash" + form.total.value);
    }
    
   
    
    if(document.orderform.rad[1])
    {
      
      
      
      form.total.value = ((price * qty));
      // calculates added interest of 1.5 %  
      form.total.value = ((price * qty / 100) * 1.5) ;
      // need to add the total of price and qty and the interest to get 
         total cost
      
      document.write("You have chosen credit" + form.total.value);
    
    }
    
    
    if (document.orderform.rad[2])
    {
    
      form.total.value = qty ((qty * price)) + 2;
      document.write("You have chosen cash" + form.total.value);
      
    }
    
    
    
  
  }

}

[Webforumz Staff]

To start I would change this line

form.total.value = ((price * qty / 100) * 1.5)
to
form.total.value *= 1.5 / 100

and

form.total.value = qty ((qty * price)) + 2;
to
form.total.value = (qty * price) + 2;

Is it picking the right if statement (payment method)? Because boolean checking a radio value won't always work.