calculations

[TrueJoker]

I have just setup an HTML form that uses javascript to total up prices etc and add on vat.

I have come across a slight snag though! the total is not restricted to 2 decimal places.

How do i do this?

the code that performs the calculations is as follows:

<script language=javascript>
<!--//

function dm(amount) 
{
  string = "" + amount;
  dec = string.length - string.indexOf('.');
  if (string.indexOf('.') == -1)
  return string + '.00';
  if (dec == 1)
  return string + '00';
  if (dec == 2)
  return string + '0';
  if (dec > 3)
  return string.substring(0,string.length-dec+3);
  return string;
}



function calculate()
{

	qtya = 0;  qtyb = 0;  qtyc = 0;  qtyd = 0;  qtye = 0;  qtyf = 0;
	
	c2n1500 = 76.17; c2n1250 = 72.25; c2n1000 = 65.57; c2n0750 = 60.50; c2n0500 = 57.28; c2n0250 = 54.05;
	
	vata = 0.175;
	
	packing = 15;
	
	if (document.form1.qtya.value > "")
		{ qtya = document.form1.qtya.value };
	document.form1.qtya.value = eval(qtya);
	totala = qtya * c2n1500;
	document.form1.totala.value = dm(eval(totala));
	
	if (document.form1.qtyb.value > "")
		{ qtyb = document.form1.qtyb.value };
	document.form1.qtyb.value = eval(qtyb);
	totalb = qtyb * c2n1250;
	document.form1.totalb.value = dm(eval(totalb));
	
	if (document.form1.qtyc.value > "")
		{ qtyc = document.form1.qtyc.value };
	document.form1.qtyc.value = eval(qtyc);
	totalc = qtyc * c2n1000;
	document.form1.totalc.value = dm(eval(totalc));
	
	if (document.form1.qtyd.value > "")
		{ qtyd = document.form1.qtyd.value };
	document.form1.qtyd.value = eval(qtyd);
	totald = qtyd * c2n0750;
	document.form1.totald.value = dm(eval(totald));
	
	if (document.form1.qtye.value > "")
		{ qtye = document.form1.qtye.value };
	document.form1.qtye.value = eval(qtye);
	totale = qtye * c2n0500;
	document.form1.totale.value = dm(eval(totale));
	
	if (document.form1.qtyf.value > "")
		{ qtyf = document.form1.qtyf.value };
	document.form1.qtyf.value = eval(qtyf);
	totalf = qtyf * c2n0250;
	document.form1.totalf.value = dm(eval(totalf));
	
	subtotal = totala + totalb + totalc + totald + totale + totalf;
	document.form1.subtotal.value = dm(eval(subtotal));
	
	vat = vata * subtotal;
	document.form1.vat.value = dm(eval(vat));
	
	incvat = subtotal + vat;
	document.form1.incvat.value = dm(eval(incvat));
	
	if (document.form1.incvat.value < 500)
		{ incvat = document.form1.incvat.value };
	document.form1.incvat.value = eval(incvat);
	grandtotal = incvat + packing;
	document.form1.grandtotal.value = dm(eval(grandtotal));
	
	
} 

//-->
</script>

 

[BillyRayPreachersSon]

You should not rely on client-side technology to do this, otherwise any script kiddy with a DOM editor will be able to alter prices, etc.

You should do this sort of logic server-side.

Hope this helps,
Dan



Coedit Limited - Delivering standards compliant, accessible web solutions

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