Dot Net or Javascript problem???

13 Jan 2006 2:52 PM

B. Chernick

I have a problem and I'm not sure whether it's Dot Net or Javascript so I'm
posting here.

I have a web page with a text field and a custom validator. The validator
points to a javascript function. The idea is to prevent saving of entries
that are less than 6 characters. The function works fine as long as there is
at least 1 character in the field. What I cannot understand is why it does
not fire at all if the textbox is blank. Here's the code. I put in an alert
to check if it was being called. (Perhaps I should mention that I am an
absolute beginner in Javascript.)

function ValidateLicense(sender,args)
{
var r = document.getElementById("<%= driversLicense.ClientID %>");
     args.IsValid = true;
// window.alert(r.value.length);
    if (r.value.length < 6)
   {
        args.IsValid = false;
    }
}

13 Jan 2006 2:55 PM

Marina

Those don't fire on blank fields. You have to use a requiredfieldvalidator
in conjunction with your custom one.

The technical reason I am guesing is that the function is hooked up to fire
on the lose focus event, which wouldn't fire if the user never set focus to
the text box in the first place.

Show quoteHide quote

"B. Chernick" <BChern***@discussions.microsoft.com> wrote in message
news:3FDB9EA6-2445-43E4-94F3-A76B42EEA634@microsoft.com...
>I have a problem and I'm not sure whether it's Dot Net or Javascript so I'm
> posting here.
>
> I have a web page with a text field and a custom validator. The validator
> points to a javascript function. The idea is to prevent saving of entries
> that are less than 6 characters. The function works fine as long as there
> is
> at least 1 character in the field. What I cannot understand is why it
> does
> not fire at all if the textbox is blank. Here's the code. I put in an
> alert
> to check if it was being called. (Perhaps I should mention that I am an
> absolute beginner in Javascript.)
>
> function ValidateLicense(sender,args)
> {
> var r = document.getElementById("<%= driversLicense.ClientID %>");
>     args.IsValid = true;
> // window.alert(r.value.length);
>    if (r.value.length < 6)
>   {
>        args.IsValid = false;
>    }
> }

13 Jan 2006 4:38 PM

Peter Blum

Allow me to refine Marina's answer.

You can omit the control ID assigned to the ControlToValidate property. The
CustomValidator will not know the textbox is blank and will always run.
However, it will not fire during the onchange event.

I put together an article on various problems users face with validators:
http://aspalliance.com/699.

--- Peter Blum
www.PeterBlum.com
Email: PLB***@PeterBlum.com
Creator of "Professional Validation And More" at
http://www.peterblum.com/vam/home.aspx

Show quoteHide quote

"B. Chernick" <BChern***@discussions.microsoft.com> wrote in message
news:3FDB9EA6-2445-43E4-94F3-A76B42EEA634@microsoft.com...
>I have a problem and I'm not sure whether it's Dot Net or Javascript so I'm
> posting here.
>
> I have a web page with a text field and a custom validator. The validator
> points to a javascript function. The idea is to prevent saving of entries
> that are less than 6 characters. The function works fine as long as there
> is
> at least 1 character in the field. What I cannot understand is why it
> does
> not fire at all if the textbox is blank. Here's the code. I put in an
> alert
> to check if it was being called. (Perhaps I should mention that I am an
> absolute beginner in Javascript.)
>
> function ValidateLicense(sender,args)
> {
> var r = document.getElementById("<%= driversLicense.ClientID %>");
>     args.IsValid = true;
> // window.alert(r.value.length);
>    if (r.value.length < 6)
>   {
>        args.IsValid = false;
>    }
> }

14 Jan 2006 10:49 PM

B. Chernick

Thanks! (I clearly have some studying to do...)

Show quoteHide quote

"Peter Blum" wrote:

> Allow me to refine Marina's answer.
>
> You can omit the control ID assigned to the ControlToValidate property. The
> CustomValidator will not know the textbox is blank and will always run.
> However, it will not fire during the onchange event.
>
> I put together an article on various problems users face with validators:
> http://aspalliance.com/699.
>
> --- Peter Blum
> www.PeterBlum.com
> Email: PLB***@PeterBlum.com
> Creator of "Professional Validation And More" at
> http://www.peterblum.com/vam/home.aspx
>
> "B. Chernick" <BChern***@discussions.microsoft.com> wrote in message
> news:3FDB9EA6-2445-43E4-94F3-A76B42EEA634@microsoft.com...
> >I have a problem and I'm not sure whether it's Dot Net or Javascript so I'm
> > posting here.
> >
> > I have a web page with a text field and a custom validator. The validator
> > points to a javascript function. The idea is to prevent saving of entries
> > that are less than 6 characters. The function works fine as long as there
> > is
> > at least 1 character in the field. What I cannot understand is why it
> > does
> > not fire at all if the textbox is blank. Here's the code. I put in an
> > alert
> > to check if it was being called. (Perhaps I should mention that I am an
> > absolute beginner in Javascript.)
> >
> > function ValidateLicense(sender,args)
> > {
> > var r = document.getElementById("<%= driversLicense.ClientID %>");
> >     args.IsValid = true;
> > // window.alert(r.value.length);
> >    if (r.value.length < 6)
> >   {
> >        args.IsValid = false;
> >    }
> > }
>
>
>