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04.26.2008 at 10:07AM PDT, ID: 23356003
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8.8

JavaScript calculator rounding problem, Internet Explorer, Firefox (latest versions)

Asked by ndechiaro in JavaScript

Tags: , ,

Hello,
I am trying to create a pricing calculator to be used on an html page, and I found a small
piece of JavaScript code which I used as the basis for my script.  The "Annual Cost" column
has a problem rounding for the "Blackberry devices" field and the "Totals" field.  An
example would be if you enter 1 in all the "quantity" fields, the product for the above
mentioned fields is 204.39 and 425.78 instead of the desired result of 204.40 and 425.80.  
I believe the problem is the "function dp(price)" portion of the script, and the value of
the Blackberry devices being 12.95.  The problem does not occur if I change the value to
12.50.
Requested but not required:
If possible, I would also like to add the following capabilities to the script:
1.) Add "$" sign before each amount generated in the "total" fields.
2.) Have a portion of the script dedicated to pricing, and use variable substitution to
enable a more efficient and accurate means of altering prices when needed.

Any suggestions would be greatly appreciated.
Thanks in advance for your assistance,
Nick

Here is the code:Start Free Trial 
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<!-- This script has been in the http://www.javascripts.com Javascript Public Library! -->
<HTML><HEAD><TITLE>Pricing Calculator</TITLE>
<SCRIPT>
 
function dp(price) 
{
   string = "" + price;
   number = string.length - string.indexOf('.');
   if (string.indexOf('.') == -1)
      return string + '.00';
   if (number == 1)
      return string + '00';
   if (number == 2)
      return string + '0';
   if (number > 3)
      return string.substring(0,string.length-number+3);
return string;
}
 
function calculate()
{
document.calcform.total1.value = dp((13.50)*(document.calcform.quantity1.value))
document.calcform.total2.value = dp((12.95+49)*(document.calcform.quantity2.value))
document.calcform.total3.value = dp((4.95)*(document.calcform.quantity3.value))
document.calcform.subtotal.value = dp(eval(document.calcform.total1.value) + 
 
eval(document.calcform.total2.value) + eval(document.calcform.total3.value))
 
document.calcform.total11.value = dp((13.50)*(document.calcform.quantity1.value))
document.calcform.total21.value = dp((12.95)*(document.calcform.quantity2.value))
document.calcform.total31.value = dp((4.95)*(document.calcform.quantity3.value))
document.calcform.subtotal11.value = dp(eval(document.calcform.total11.value) + 
 
eval(document.calcform.total21.value) + eval(document.calcform.total31.value))
 
document.calcform.total12.value = dp((13.50*12)*(document.calcform.quantity1.value))
document.calcform.total22.value = dp((12.95*12+49)*(document.calcform.quantity2.value))
document.calcform.total32.value = dp((4.95*12)*(document.calcform.quantity3.value))
document.calcform.subtotal12.value = dp(eval(document.calcform.total12.value) + 
 
eval(document.calcform.total22.value) + eval(document.calcform.total32.value))
}
 
function resetBtn(){
document.calcform.quantity1.value=""
document.calcform.quantity2.value=""
document.calcform.quantity3.value=""
document.calcform.total1.value=""
document.calcform.total2.value=""
document.calcform.total3.value=""
document.calcform.subtotal.value=""
 
document.calcform.total11.value=""
document.calcform.total21.value=""
document.calcform.total31.value=""
document.calcform.subtotal11.value=""
 
document.calcform.total12.value=""
document.calcform.total22.value=""
document.calcform.total32.value=""
document.calcform.subtotal12.value=""
 
}
 
</SCRIPT>
</HEAD><BODY bgcolor="#ffffff" onload="calculate">
 
<FORM name="calcform">
 
<h2>Pricing Calculator Sample</h2>
<table border="1" width="880">
	<tr>
		<td width="416">&nbsp;</td>
		<td width="43" align="center">&nbsp;</td>
		<td width="104">&nbsp;</td>
		<td align="center" width="88">First Month*</td>
		<td align="center" width="106">Monthly Cost</td>
		<td align="center" width="106">Annual Cost</td>
	</tr>
	<tr>
		<td width="416">
		<p align="right">Please enter number of mailboxes required:</td>
		<td width="43" align="center"> 
<INPUT type="text" name="quantity1" size="6"></td>
		<td width="104">&nbsp;</td>
		<td align="center" width="88">
		<INPUT type="text" name="total1" size="14"></td>
		<td align="center" width="106"> 
		<INPUT type="text" name="total11" size="14"></td>
		<td align="center" width="106"> 
		<INPUT type="text" name="total12" size="14"></td>
	</tr>
	<tr>
		<td width="416">&nbsp;</td>
		<td width="43" align="center">&nbsp;</td>
		<td width="104">&nbsp;</td>
		<td align="center" width="88">&nbsp;</td>
		<td align="center" width="106">&nbsp;</td>
		<td align="center" width="106">&nbsp;</td>
	</tr>
	<tr>
		<td width="416">
		<p align="right">Please enter number of Blackberry devices:</td>
		<td width="43" align="center"> 
<INPUT type="text" name="quantity2" size="6"></td>
		<td width="104">&nbsp;</td>
		<td align="center" width="88">
		<INPUT type="text" name="total2" size="14"></td>
		<td align="center" width="106"> 
		<INPUT type="text" name="total21" size="14"></td>
		<td align="center" width="106"> 
		<INPUT type="text" name="total22" size="14"></td>
	</tr>
	<tr>
		<td width="416">&nbsp;</td>
		<td width="43" align="center">&nbsp;</td>
		<td width="104">&nbsp;</td>
		<td align="center" width="88">&nbsp;</td>
		<td align="center" width="106">&nbsp;</td>
		<td align="center" width="106">&nbsp;</td>
	</tr>
	<tr>
		<td width="416">
		<p align="right">Please enter number of Windows Mobile devices:</td>
		<td width="43" align="center">
		<INPUT type="text" name="quantity3" size="6"></td>
		<td width="104">&nbsp;</td>
		<td align="center" width="88">
		<INPUT type="text" name="total3" size="14"></td>
		<td align="center" width="106">
		<INPUT type="text" name="total31" size="14"></td>
		<td align="center" width="106">
		<INPUT type="text" name="total32" size="14"></td>
	</tr>
	<tr>
		<td width="416">&nbsp;</td>
		<td width="43" align="center">&nbsp;</td>
		<td width="104">&nbsp;</td>
		<td align="center" width="88">________</td>
		<td align="center" width="106">________</td>
		<td align="center" width="106">________</td>
	</tr>
	<tr>
		<td width="416">&nbsp;</td>
		<td width="43" align="center">&nbsp;</td>
		<td width="104">
		<p align="right">Totals:</td>
		<td align="center" width="88">
		<INPUT type="text" name="subtotal" size="14"></td>
		<td align="center" width="106">
		<INPUT type="text" name="subtotal11" size="14"></td>
		<td align="center" width="106">
		<INPUT type="text" name="subtotal12" size="14"></td>
	</tr>
	<tr>
		<td width="416">&nbsp;</td>
		<td width="43" align="center">&nbsp;</td>
		<td width="104">&nbsp;</td>
		<td align="center" width="88">&nbsp;</td>
		<td align="center" width="106">&nbsp;</td>
		<td align="center" width="106">&nbsp;</td>
	</tr>
	<tr>
		<td width="416">* Includes one-time setup fees (if applicable)</td>
		<td width="43" align="center">&nbsp;</td>
		<td width="104">&nbsp;</td>
		<td align="center" width="88">&nbsp;</td>
		<td align="center" width="106">&nbsp;</td>
		<td align="center" width="106">&nbsp;</td>
	</tr>
</table>
<p>Click this button to calculate your totals:&nbsp;&nbsp;&nbsp;
<INPUT type="button" Value="Calculate" ONCLICK="calculate()" name="btn1">&nbsp;&nbsp;&nbsp;
<INPUT type="button" Value="Reset" name="btn2" ONCLICK="resetBtn()"></p>
</FORM>
 
</BODY></HTML>
<!-- Pricing Calculator -->
[+][-]04.26.2008 at 11:17AM PDT, ID: 21446353

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Zone: JavaScript
Tags: JavaScript, Internet Explorer, Firefox (latest versions), Not published at this time
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Solution Provided By: HonorGod
Participating Experts: 1
Solution Grade: A
 
 
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