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Groups > comp.lang.javascript > #17187
| From | Gregor Kofler <usenet@gregorkofler.com> |
|---|---|
| Newsgroups | comp.lang.javascript |
| Subject | Re: JavaScript Case Project 3-1: The dreaded NaN error |
| Date | 2012-11-12 09:51 +0100 |
| Organization | A noiseless patient Spider |
| Message-ID | <k7qdb9$a45$1@dont-email.me> (permalink) |
| References | <055e7215-93ba-40a9-81f3-312ea0e4f5e2@googlegroups.com> |
Am 2012-11-11 17:28, dmn2004404@gmail.com meinte:
[snip]
> <head>
> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
> <title>Untitled Document</title>
> <script type="text/javascript">
> var purchasePrice = txtPurchasePrice.value, shippingAndHandling, totalCost;
Should already throw an error (reference error), since txtPurchasePrice
is undefined at this point and txtPurchasePrice.value can't be evaluated.
> function calculateShipping() {
Something like
var purchasePrice =
parseFloat(document.forms["form1"].elements["txtPurchasePrice"].value)
*in* the function should do the trick.
(Multiplying a "float-like" string with a float will also result in a
float).
> if (purchasePrice <= 25)
> shippingAndHandling = 1.50;
> else
> shippingAndHandling = purchasePrice * .10;
> totalCost = purchasePrice + shippingAndHandling;
> window.alert('Purchase price plus shipping and handling is $' + totalCost);
> }
> </script>
> </head>
> For the record, I've also tried changing "txtPurchasePrice.value" to "document.getElementById('txtPurchasePrice').value"
Depends *when* you try to reference the element.
Gregor
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JavaScript Case Project 3-1: The dreaded NaN error dmn2004404@gmail.com - 2012-11-11 08:28 -0800
Re: JavaScript Case Project 3-1: The dreaded NaN error "Mel Smith" <med_cutout_syntel@aol.com> - 2012-11-11 10:08 -0700
Re: JavaScript Case Project 3-1: The dreaded NaN error dmn2004404@gmail.com - 2012-11-11 09:34 -0800
Re: JavaScript Case Project 3-1: The dreaded NaN error "Mel Smith" <med_cutout_syntel@aol.com> - 2012-11-11 10:56 -0700
Re: JavaScript Case Project 3-1: The dreaded NaN error dmn2004404@gmail.com - 2012-11-11 10:07 -0800
Re: JavaScript Case Project 3-1: The dreaded NaN error dmn2004404@gmail.com - 2012-11-11 10:52 -0800
Re: JavaScript Case Project 3-1: The dreaded NaN error JJ <jaejunks@glegooilma-swapit.com> - 2012-11-11 20:15 +0000
Re: JavaScript Case Project 3-1: The dreaded NaN error dmn2004404@gmail.com - 2012-11-11 12:45 -0800
Re: JavaScript Case Project 3-1: The dreaded NaN error JJ <jaejunks@glegooilma-swapit.com> - 2012-11-11 20:11 +0000
Re: JavaScript Case Project 3-1: The dreaded NaN error dmn2004404@gmail.com - 2012-11-11 12:15 -0800
Re: JavaScript Case Project 3-1: The dreaded NaN error Osmo Saarikumpu <osmo@weppipakki.com> - 2012-11-12 10:10 +0200
Re: JavaScript Case Project 3-1: The dreaded NaN error Gregor Kofler <usenet@gregorkofler.com> - 2012-11-12 09:51 +0100
Re: JavaScript Case Project 3-1: The dreaded NaN error Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-11-12 11:49 +0100
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