[Cialug] Javascript help

[Jerry Heiselman]

If you are only going to allow two digits before the decimal, then you
could always check to make sure that it isn't longer than 5
characters.

Being that I'm not all that great with regex, I would probably split
the value on  the decimal and make sure the left number is a number
and the right number modulus 5 comes out to be zero.

I know that regex is probably more efficient, but when  you are
talking about a single entry to check and only one iteration over the
input data, I generally go for simplicity for me rather than
efficiency in the code.

Jerry

On 11/4/05, Kevin C. Smith <kevin at linuxsmith.com> wrote:
> This is by first attempt at this, so be easy on me.
>
> I'm trying to come up with a javascript function to check an html form
> input field. I've got most of it but I'm have trouble with the number after
> the ".". I'm trying to match number in the form of 12.0, 12.5, 12.00,
> 12.25, 12.50, 12.75 for example. I've got the following:
>
> pattern = /^[0-9]*\.[0][0]{1}$|[2][5]{1}$|[5][0]{1}$|[7][5]{1}$/;
>
> which matches 12.00, 12.25, 12.50, 12.75 (example), but when I attempt to
> also
> match 12.0 or 12.5 I open the door to 12.255555 which I don't want.
>
> I've also noticed the it accecpt stuff like "2,5.25" which I also don't want.
>
> So far I have this:
>
> <script type="text/javascript">
> function        checknumber(field,limit)
> {
>         pattern = /^[0-9]*\.[0][0]{1}$|[2][5]{1}$|[5][0]{1}$|[7][5]{1}$/;
>         if(pattern.test(field.value)==false)
>         {
>                 alert("Please use proper format - 1:15 PM is 13.25");
>                 field.value = 0;
>         }
>         else
>         {
>                 if(field.value > limit)
>                 {
>                         alert("Out of Range! The range is 0.25-24.0");
>                         field.value = 0;
>                 }
>         }
> }
> </script>
>
> Any help would be great.
> Thanks,
>
> --
> Kevin C. Smith
>
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