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View Full Version : calculator script works but sometimes gives unwanted results



lessdangerous
07-05-2005, 11:22 PM
I'm pretty much a beginner to javascript and can read the stuff better than I can write it. That being said, I've put together a script to work with a form that'll calculate the cost of a shirt based on quantity and color. For the most part it works, but I have a few questions:

1) When I type in the first box (quantity) a digit between 2 and 9 I get something completely wrong from what I'm supposed to get, which usally is a "NaN". The numbers 1, and 10 through 47 work like they're supposed to. Why doesn't it work for numbers 2-9?

2) When I do put in a good number to work with and select a color, sometimes when the price should be something like "7.50" it actually spits out "7.5". Why does it leave off the zeroes at the end of numbers and how can I prevent it?


<html>
<head>
<script>
<!--
function getPrice(formName){

var myForm = formName.name;
var COLOR = formName.shirtcolor;
var QTY = formName.quantity;
var COLORPRICE;
var QTYPRICE;
var QUOTEPRICE;

if ( myForm == "calculator" ){
if ((QTY.value >= "1" ) && (QTY.value <= "11" )){
QTYPRICE = "27.50";
}
if ((QTY.value >= "12" ) && (QTY.value <= "23" )){
QTYPRICE = "7.50";
}
if ((QTY.value >= "24" ) && (QTY.value <= "47" )){
QTYPRICE = "6.75";
}
if ( COLOR.value == "White" ){
COLORPRICE = "0.00";
}
if ( COLOR.value == "Light" ){
COLORPRICE = "0.50";
}
if ( COLOR.value == "Dark" ){
COLORPRICE = "1.00";
}
}
QUOTEPRICE = parseFloat(QTYPRICE) + parseFloat(COLORPRICE);
formName.display.value = QUOTEPRICE;
}
// -->
</script>
</head>
<body>

<form name="calculator">

<input type=text name="quantity" size="2">

<select name="shirtcolor">
<option selected>
<option value="White">White</option>
<option value="Light">Ash</option>
<option value="Dark">Black</option>
</select>

<input type="button" value="Calculate Quote" onClick="getPrice(this.form)">

<input type="text" name="display" size="7">

</form>

</body>
</html>

A1ien51
07-06-2005, 12:54 AM
you are compareing stings....you want to compare numbers...

if ((parseInt(QTY.value) >= 1 ) && (parseInt(QTY.value) <= 11 )){

glenngv
07-06-2005, 04:39 AM
//courtesy of liorean (http://www.codingforums.com/showthread.php?p=178077#post178077)
Number.prototype.toDecimals=function(n){
n=(isNaN(n))?
2:
n;
var
nT=Math.pow(10,n);
function pad(s){
s=s||'.';
return (s.length>n)?
s:
pad(s+'0');
}
return (isNaN(this))?
this:
(new String(
Math.round(this*nT)/nT
)).replace(/(\.\d*)?$/,pad);
}

function getPrice(formName){
var QTY = Number(formName.quantity.value);
if (isNaN(QTY)){
alert("Quantity should be numeric.");
formName.quantity.focus();
return false;
}
var COLOR = formName.shirtcolor.options[formName.shirtcolor.selectedIndex].value;
var COLORPRICE = 0;
var QTYPRICE = 0;
var QUOTEPRICE;

if ( myForm == "calculator" ){
if (QTY >= 1 && QTY <= 11){
QTYPRICE = 27.5;
}
if (QTY >= 12 && QTY <= 23){
QTYPRICE = 7.5;
}
if (QTY >= 24 && QTY <= 47){
QTYPRICE = 6.75;
}

switch (COLOR){
case "White": COLORPRICE = 0; break;
case "Light": COLORPRICE = 0.5; break;
case "Dark": COLORPRICE = 1; break;
}
}
QUOTEPRICE = (QTYPRICE + COLORPRICE).toDecimals(2);
formName.display.value = QUOTEPRICE;
}
I don't know if you really need the if ( myForm == "calculator" ) condition. Will you have multiple forms with the same field names in the future?



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