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over riding string concatonation

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punkRik

punkRik

Technical User
Mar 15, 2007
2
GB
Hi. Im trying to do some simple addition with a form using javascript but instead of adding the variables it concatonates there values. Any idea how i can stop this?

the script is on here users.aber.ac.uk/rsh6/assignment%201/purchases.html

its a crude site i know, just something to get me started with the language...

any help appreciated, thanks..!
 
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parseInt() and parseFloat() are your friends.

Code: 
var stringNumber1 = "1234";
var stringNumber2 = "4321";

var concatenationExample = stringNumber1 + stringNumber2;

var additionExample = parseInt(stringNumber1) + parseInt(stringNumber2);

alert("String Concatenation Result: " + concatenationExample + "\n\nInteger Addition Result: " + additionExample);

parseInt of course being for integer numbers, parseFloat if you need a floating point number.

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Thanks! Its an improvement anyway, now i'm just getting the NaN (not a number) message as an output in my result. Any idea how to repair this?

thanks!
 
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Yeah, make sure the string you're parsing is a number.
When you alert the parseInt value from b you get NaN - since "abc" is obviously not a number (unless you're dealing with hex)
Code: 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "[URL unfurl="true"]http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">[/URL]
<html xmlns="[URL unfurl="true"]http://www.w3.org/1999/xhtml">[/URL]
<head>
<title>title test</title>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
<script type="text/javascript">

var a = "123";
var b = "abc";

alert(parseInt(a, 10));
alert(parseInt(b, 10));

</script>
<style type="text/css"></style>
</head>
<body>

</body>
</html>

-kaht

Looking for a puppy? [small](Silky Terriers are hypoallergenic dogs that make great indoor pets due to their lack of shedding and small size)[/small]
 
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