[thelist] JS field validation ?

[Winfried Huslik]

Be careful with alerts! They mess up things sometimes.
Better do the calculation first and later show the alert.

In your case I would simply change the order by checking for a number 
first and if that fails, throw the alert.

Winfried Huslik


On 2001-02-20 18:56 Uhr, Bob Davis (bobd at members.evolt.org) wrote:

>
>Hi all, 
>
>I'm having a little problem getting something to work.  I am trying to
>determine whether a value entered into a form field is a number, and, if it
>is, to call another function.
>
>My validation function is:
>
>function CheckRange(box)    {
>    if    (isNaN(box.value))    {
>        alert('You must enter a number')
>        }    
>    else { valChange() }
>        
>    }
>
>and the form field looks like this:
>
><input type="text" onChange="CheckRange(this)" size=1 name="xaxis" value="0"
>tabindex="1">
>
>For some reason, if I enter a non-numeric value into the field, the alert
>box does come up, but the valChange function is called.  It shouldn't be,
>right?
>
>Obviously, I've made a mistake somewhere.  I just don't know where it is.
>
>Can anyone offer some advice?
>
>TIA,
>bob    
>
>-- 
>
>bob davis
>bobd at members.evolt.org
>
>
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