[Javascript] required entry field
David T. Lovering
dlovering at gazos.com
Fri Mar 28 18:06:16 CST 2003
How about this:
<html>
<head>
<title>myFieldChecker</title>
<script language='JavaScript'>
<!--
function isValid() {
if (document.myForm.NeverBlank.value == '') {
document.myForm.NeverBlank.focus();
}
}
// -->
</script>
</head>
<body>
<form name='myForm' action='javascript:void(null)'>
<table name='myTable' cellpadding=2 cellspacing=0 align='center'>
<tr><td><input name='NeverBlank' type='text' size='30' onBlur='isValid()'></td></tr>
</table>
</form>
</body>
</html>
That should at least fail more interestingly. Obviously, the form action and other impedimenta may be tweaked as desired.
-- Dave Lovering
BEKIM BACAJ wrote:
>
> Correction to my previous reply that is being held by Latech server.
> If <input...> is placed inside the <form...> object, this script (my
> script) will not function at all:
>
> function isValid() { if(NeverBlank.value==''){
> NeverBlank.focus()
> }
> }
> It will generate error: "Object Expected".
>
> Rodneys script :
> function isValid(form) {
> if(form.NeverBlank.value==''){
> form.NeverBlank.focus()
> }
> }
> will not work in ether casse, it will genareate Error: '"NeverBlank" is null
> or not an Object', in both cases.
>
> All items inside the form object become slaves or somekind of captives by
> form individual, their names or IDs will not be processed, and will have no
> rights to speak in their names, only the form master will act as
> representative and is allowed to communicate with them.
> Because of that, you will have to ask the Form waht is the name or the value
> of the item(x).
>
> So in this casse, (forms introduce some security issues) my script will have
> to get modified into this:
> (Presumming that the formname is 'myForm')
> function isValid() {
> if(myForm.NeverBlank.value=='')
> {
> myForm.item(0).focus()//if first input in the collection
> document.forms(0).item(0).focus()//if first form in the document (uggly
> and very unoptimized)
> }
> }
> So these are the ways one can access inputs (items) inside the form:
>
> a. doument.forms(n).item(n) //'n' stands for numeric value
> b. myForm.item(n)
> c. myForm.NeverBlank
>
> But the best is the last.(it executes faster) 3x, if only one form in the
> document and only one item in the form, and as the number increases the
> difference of speed follows by multiplying the starting difference of speed
> compared with [a] choice. And it's more scripter-firendly.
>
> Guess I've learned my mistake, and hope I've made my point clear.
> With respect, Bekim
>
> >From: "David T. Lovering" <dlovering at gazos.com>
> >Reply-To: "[JavaScript List]" <javascript at LaTech.edu>
> >To: "[JavaScript List]" <javascript at LaTech.edu>
> >Subject: Re: [Javascript] required entry field
> >Date: Fri, 28 Mar 2003 11:15:41 -0700
> >
> >Hmmm... I'll take a stab at this.
> >
> >Inputs and other data-entry fields and widgets exist solely to collect
> >information from the remote user. In order for them to work in this
> >capacity, they are collectively grouped together under the heading of a
> >'form', and are sent back to wherever the
> >data processing and analysis is done (usually on a CGI/BIN formserver
> >somewhere).
> >
> >Many of these widgets don't work at all, or don't work properly UNLESS they
> >are in a form. The general structure of a form is as follows:
> >
> > <body>
> > ... yada yada
> > <form name='myForm' action='stuff that points to formserver'
> >type="CGI/BIN" method="POST">
> > <table>
> > ... tidy graphical arrangement of input devices
> > </table>
> > </form>
> > ... yada yada
> > </body>
> >
> > Obviously, a lot more can be said. If you want to use the form only for
> >the active data widgets and not to actually go anywhere, you can throw away
> >the type and method declaractions, and change the action as follows:
> >
> > action='javascript:void(null)'
> >
> > There, does that answer your question?
> >
> > -- Dave Lovering
> >
> >BEKIM BACAJ wrote:
> > >
> > > Thanks, Rodney.
> > > Now,I would like to ask a question on what 'form' stands for?
> > > Also are you sugesting that my script will not work faster than your's,
> >or,
> > > that my script will not work at all?
> > >
> > > Bekim
> > >
> > > >From: Rodney Myers <rodney at aflyingstart.net>
> > > >Reply-To: "[JavaScript List]" <javascript at LaTech.edu>
> > > >To: "[JavaScript List]" <javascript at LaTech.edu>
> > > >Subject: Re: [Javascript] required entry field
> > > >Date: Fri, 28 Mar 2003 10:11:19 +0000
> > > >
> > > >That would be .....
> > > >
> > > >function isValid(form) { if(form.NeverBlank.value=='')
> > > > {
> > > > form.NeverBlank.focus()
> > > > }
> > > >}
> > > >
> > > >hth
> > > >Rodney
> > > >
> > > >
> > > >
> > > >BEKIM BACAJ wrote:
> > > >
> > > >>Einstein went mad when he heard that somebody wrote SF novel about a
> >man
> > > >>who traveled with the speed of light and saw the batle of Waterloe,
> >for it
> > > >>is insaine he yelled.
> > > >>But 'you' can init the new battle at Waterlloe again
> > > >>
> > > >>function isValid() { if(NeverBlank.value==''){
> > > >> NeverBlank.focus()
> > > >> }
> > > >> }
> > > >>
> > > >>dejavoo - loops forever - if the user does not supply some chars!
> > > >>
> > > >
> > > >--
> > > >PS. I have just bought a licence for Mike Chen's
> > > >BizAutomator. If you have to answer routine email queries from your
> >sites
> > > >or mailings then
> > > >you need this as much as I do. http://www.BizAutomator.com/rlbm51
> > > >
> > > >Rodney
> > > >
> > > >
> > > >
> > > >
> > > >_______________________________________________
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> > > >Javascript at LaTech.edu
> > > >https://lists.LaTech.edu/mailman/listinfo/javascript
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