Number Function

[Mark]

Hi,

Im trying to figure out how I can have data validated in a text input form.
Basically the data entered into the form must consist of 2 uppercase letters
followed by 5 non negative numbers with no spaces in between. I want it to
display an error message if the letters arent in uppercase & if any of the
numbers are negative. Ive figured out how to validate text, but not a
mixture of text & numbers.

Any help on this would be greatly appriciated.

Regards

Mark

[Thomas 'PointedEars' Lahn]

Re: Number Function

Mark wrote:
[color=blue]
> Im trying to figure out how I can have data validated in a text input form.
> Basically the data entered into the form must consist of 2 uppercase letters
> followed by 5 non negative numbers with no spaces in between. I want it to
> display an error message if the letters arent in uppercase & if any of the
> numbers are negative. Ive figured out how to validate text, but not a
> mixture of text & numbers.[/color]

Regular expressions are the method of choice here. You need to test if the
Regular expression matches against the value of a form element. If so, you
return true to the onsubmit event handler, false otherwise.

<script type="text/javascript" language="JavaS cript">
<!--
function checkMe(s)
{
if (/^[A-Z]{2}[0-9]{5}$/.test(s))
return true;
else
{
alert("Error!") ; // you should be more descriptive here ;-)
return false;
}
}
//-->
</script>

<form ... onsubmit="retur n checkMe(this.el ements['foobar'].value)">
...
<input name="foobar" ...>
...
<input type="submit" ...>
</form>

See

http://devedge.netscape.com/library/manuals/2000/javascript/1.5/guide/regexp.html#1010922

for details.

Keep in mind that server-side checking is also required as
client-side JavaScript can be disabled or not supported. The
client-side form checking can merely reduce network traffic
and server requests.


HTH

PointedEars

[Dr John Stockton]

Re: Number Function

JRS: In article <3F8C269C.80408 @PointedEars.de >, seen in
news:comp.lang. javascript, Thomas 'PointedEars' Lahn
<PointedEars@we b.de> posted at Tue, 14 Oct 2003 18:38:52 :-[color=blue]
> function checkMe(s)
> {
> if (/^[A-Z]{2}[0-9]{5}$/.test(s))
> return true;
> else
> {
> alert("Error!") ; // you should be more descriptive here ;-)
> return false;
> }
> }[/color]


The following should be equivalent, and is IMHO easier to check :-

function checkMe(s) {
var OK = /^[A-Z]{2}\d{5}$/.test(s)
if (!OK) alert("Error!") ; // you should be more descriptive here ;-)
return OK
}


--
© John Stockton, Surrey, UK. ?@merlyn.demon. co.uk Turnpike v4.00 IE 4 ©
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