form validation 1

[timcarr]

I need validate that a form field does not begin with a number.
In Perl this would be something like:
variable =~ /^\d/

The code will be similar to this:

if ([field begins with number code])
{
alert("Field cannot begin with a number."
theForm.field.focus();
return (false);
}


Any help is appreciated.
Thanks

 

[Deltaflyer]

How about the following,

if isNaN(variable)
{}
else
{
alert("Field cannot begin with a number.&quot
...
...
...et cetera
}

Works for me..... DeltaFlyer ;-)

DeltaFlyer - The Only Programmer To Crash With Style.

 

[timcarr]

Thanks for the reply, but since this is a password field I would like numbers to be allowed, just not at the beginning (our server doesn't allow this).

 

[Deltaflyer]

ok, so how about....

if isNaN(form.field.value.slice(0,1))
{}
else
{}
et cetera

this will take the first digit of the password and check it is not a number, but not care less about the other letters.

Better??
DeltaFlyer ;-)

DeltaFlyer - The Only Programmer To Crash With Style.

 

[timcarr]

That's exactly what I needed.

Thanks.

 

[Deltaflyer]

Anytime. DeltaFlyer ;-)

DeltaFlyer - The Only Programmer To Crash With Style.

 

[jaredn]

timcarr,

regular expressions in javascript are based on perls implementation of regular expressions. to use regexps in js to solve your problem, try:

if(/^\d/.test(somevariable))
{
alert("The variable starts with a number.&quot
}
else
{
alert("The variable does not start with a number.&quot
}

jaredn@eae.net -

http://webfx.eae.net