[Zope] javascript vars in dtml

[Jonathan Hobbs]

From: "Tino Wildenhain" <tino at wildenhain.de>
Subject: Re: [Zope] javascript vars in dtml
> Am Freitag, den 25.02.2005, 11:41 +0000 schrieb cla:
> > Hi!
> >
> > i would like to know if its possible
> > to pass javascript variables to dtlm methods.
> >
> > for example:
> > <script type="text/javascript">
> >
> > function general(){
> >
> > var t="hello"
> >
> > /* here is the problem until now
> > within dtml the they dont recognize
> > the t var */
> >
> > <dtml-in "func(t)">
> > ...
> > </dtml-in>
> >
> >
> > }
> >
> >
> >
> > </script>
> >
> > thanks
>
> You are confused :-) JavaScript is entirely
> interpreted by the client - the client gets
> the page after the server has fully processed
> it.

But, in the case where you want javascript to process user entered data, or
to provide additional information based on some user action, you have two
options (that i can think of, there are probably more!):

1) have javascript create additional 'form' fields containing the info you
want passed back to dtml/scripts (said form fields can then be processed as
usual)

2) create a hidden iframe in your html page; use javascript to reload this
page by building a url (with data parameters) which invokes a dtml/script
routine.  The dtml/script can process the parameters passed in the url and
then pass whatever you want back to the client  where your javascript can
then interpret the response from the dtml/script.  This is a nice way of
communicating between the client and your zope site without the user seeing
page reloads.

hth

Jonathan