[Zope] Simple form processing query

[Amos Latteier]

At 09:00 PM 5/3/99 -0500, Albert Boulanger wrote:
>I would just like to print out the key, values from REQUEST.form. Why
>does this DTML not work?

When you try this Zope gives you an error. Though sometimes cryptic, the
error often can help you figure out what's wrong. In your case the error
you get is 

Error Type: KeyError
Error Value: REQUEST.form

This means Zope can't find something called "REQUEST.form" In your case
this is a hint that your var tag is wrong. In fact, you are trying to
render a variable named "REQUEST.form", when you really want to call a
method on the REQUEST's form attribute.

>in a DTML document "process" which is the post url. (I skipped the empty
>form test for simplicity in this.)
>
><!--#var standard_html_header-->
><h2><!--#var title_or_id--></h2>
>
><!--#in REQUEST.form-->
><p>
><!--#var sequence-key--> <!--var sequence-item-->
></p>
><!--#/in-->
><!--#var standard_html_footer-->

You're pretty close to right, but there are a couple of problems.

You want to iterate through a set of (key,value) tuples. Yet you are
calling something called "REQUEST.form" to generate these tuples. What you
are actually looking for is 

<!--#var expr="REQUEST.form.items()"-->

This means evaluate an expression, which consists of calling the items
method on the REQUEST's form attribute. items is a standard Python method
which dictionaries support. It returns a list of (key,values) tuples.

The only problem you have is a typo. <!--var sequence-item--> should be
<!--#var sequence-item-->

Good luck!

-Amos

P.S. You might want to look closely in the DTML Users Guide about the
difference between the normal var tag, and using expressions with the var tag.