[Zope] check input

[Dieter Maurer]

Olaf Zanger writes:
 > > .... <input name="weight:float"> raises exception for empty field ....
 > > What should happen, when the user does not provide the float?
 > the ZSQL method has a dtml-if-statement. so it doesn't worry about a empty variable,
 > but about a nonexisting.
"dtml-if" does not worry about a nonexisting variable, too.

Maybe, you need to give your "argument" a default value.
Otherwise, ZSQL may complain about a missing argument, before
the templates "dtml-if" has a chance.

 > >  * should the field be omitted?
 > no, it should be empty or valid
 > 
 > >    Then try the ":ignore_empty" suffix.
 > the zsql-method gives me a error message because variable does not exist
 > where is that documented, i can't find it
":ignore_empty" tells ZPublisher to just discard empty variables.

If your ZSQL method does not provide a default value for this
variable (and it lists it as an argument, of cause),
then it will complain.

There is a HowTo on zope.org that explains the magic
ZPublisher form name suffixes.
 
 > >  * do you want a default value in this case?
 > >    Then try the ":default" suffix in an additional (hidden) form control
 > >    to provide this default!
 > <input name:date:ignore_empty="min_date" value=""><input type="hidden"
 > name:default="min_date" value="">
Help! What's that?

  You do not append the suffixes to the HTML attribute names
  but the the value of the NAME attribute.

Thus, this should look like:

      <input type="hidden" name="min_date:date:default" value="1900/01/01">
      <input name="min_date:date" value="">

 > it doesn't work, what is wrong. i don't understand the conzept either.
Try to find the HowTo.



Dieter