Form quantity checking

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  18 years ago

  by andysears

  Andy Sears

  Bedford UK, United Kingdom

  Joined 19 years ago

  I am currently working on a site with a basic shopping cart facility. I have very little knowledge of javascript.
  

  
  On selecting items from a form, the details are passed to the partsorder page and for is checked for qauntity selected. I am passing three cart parameters partcode, itemcode+description and qunatity.
  

  
  the checking routine below returns an error  'subscript out of range 'i' this only happens if only 1 item is selected to purchase, 2 or more items and the routines work correctly, its doing my head in, can anyone help.
  

  
  regards
  

  
  Andy Sears email me
  

  
  function checkQty () {
  var intQ
  var intTot = parseInt(document.forms[0].TotalOrders.value, 10)
  

  
     for (i=0;i<intTot;i++) {
     intQ = parseInt(document.forms[0].elements[(i5)+11+5].value, 10)
         if (! intQ && intQ != 0) {
         alert("Please ensure a numerical value is added.")
         document.forms[0].elements[(i5)+11+5].focus()
         return false;
         }
     }
  

  
  }
  

  
  

  
  

  
  

  
  

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• • Reply

  18 years ago

  by paulfp

  Paul Freeman-Powell

  Liverpool, United Kingdom

  Joined 19 years ago

  i'm trying to get my head round your code, so that i can help you
  

  
  could you explain the "(! intQ && intQ != 0)" bit....
  

  
  i may be wrong but as far as i can see you're saying "if intQ equals false AND it doesn't equal false".... and i dont understand that :P
  

  
  once i  understand it all i'll do my best to help you

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