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Number Function

P: n/a
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
Jul 20 '05 #1
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2 Replies


P: n/a
Mark wrote:
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.


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="JavaScript">
<!--
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="return checkMe(this.elements['foobar'].value)">
...
<input name="foobar" ...>
...
<input type="submit" ...>
</form>

See
http://devedge.netscape.com/library/...p.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

Jul 20 '05 #2

P: n/a
JRS: In article <3F************@PointedEars.de>, seen in
news:comp.lang.javascript, Thomas 'PointedEars' Lahn
<Po*********@web.de> posted at Tue, 14 Oct 2003 18:38:52 :-
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;
}
}

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
<URL:http://jibbering.com/faq/> Jim Ley's FAQ for news:comp.lang.javascript
<URL:http://www.merlyn.demon.co.uk/js-index.htm> JS maths, dates, sources.
<URL:http://www.merlyn.demon.co.uk/> TP/BP/Delphi/JS/&c., FAQ topics, links.
Jul 20 '05 #3

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