test alphanumeric string

[Matt]

I want the javascript to test an alphanumeric (a string contains
alphabet or numbers only) string. Should I write a regular expression?
What's the best way to do? please help. thanks

 

[kaeli]

I want the javascript to test an alphanumeric (a string contains
alphabet or numbers only) string. Should I write a regular expression?
What's the best way to do? please help. thanks

From my validation.js file...

function checkAlphanum(strObject)
{
/* Returns true if the field has all alphanumeric characters, false if
not.
You must pass in a input (text) object, not the value. */
var re = /^[A-Za-z0-9]+$/;
if (!strObject || isBlank(strObject)) return false;
else return re.test(strObject.value);
}

function isBlank(strObject)
{
/* Returns true if the field is blank, false if not.
You must pass in an input (text) object (not the value) */
var re = /\S+/;

if (!strObject) return true;
return re.test(strObject.value));
}

HTH
--
--
~kaeli~
If that phone was up your a$$, maybe you could drive a
little better!
http://www.ipwebdesign.net/wildAtHeart
http://www.ipwebdesign.net/kaelisSpace

 

[Dr John Stockton]

JRS: In article <[email protected]>,
dated Thu, 16 Sep 2004 09:17:13, seen in Matt

I want the javascript to test an alphanumeric (a string contains
alphabet or numbers only) string. Should I write a regular expression?

Either that or copy one.

What's the best way to do? please help. thanks

<URL:http://www.merlyn.demon.co.uk/js-valid.htm#VP>, x1, adjust {6,10}.

 

[Michael Winter]

[snip]

function checkAlphanum(strObject)
{
/* Returns true if the field has all alphanumeric characters,
false if not.
You must pass in a input (text) object, not the value. */
var re = /^[A-Za-z0-9]+$/;
if (!strObject || isBlank(strObject)) return false;
else return re.test(strObject.value);
}

Though the call to isBlank is redundant. As far as I can see, it would
only be of significance if checkAlphanum allowed whitespace but you wanted
to ensure that the value didn't contain only whitespace.

[snip]

Mike

 

[kaeli]

function isBlank(strObject)
{
/* Returns true if the field is blank, false if not.
You must pass in an input (text) object (not the value) */
var re = /\S+/;

if (!strObject) return true;
return re.test(strObject.value));

Whoops, this should be
return !re.test(strObject.value));


--
--
~kaeli~
The Bermuda Triangle got tired of warm weather. It moved to
Finland. Now Santa Claus is missing.
http://www.ipwebdesign.net/wildAtHeart
http://www.ipwebdesign.net/kaelisSpace