On Fri, Oct 04, 2002 at 04:15:01PM -0400, Hires, Russell (CAP, CARD) wrote:
Hey All,
I'm experimenting with zope again, playing with the REQUEST object and form objects. In my latest delimma, I've got the following snippet:
<dtml-if expr="check_box == ('on')"> The check box is checked! </dtml-if>
What I don't get: if the checkbox is checked in the form, then this works, and I get the output. If it isn't checked, then I get an error saying that the checkbox ("check_box" in the form) isn't defined. This is borne out as well by <dtml-var expr="REQUEST.form">, which shows a text box's name and the value that it holds (whether it holds a value or not), and the checkbox's name and value ('on'), when it's checked. If it isn't checked, it isn't there at all. So, I guess I'm going to have to look to see whether it's there or not, right? How would I do that?
This is how HTML works. Rather bad design. You want something like: <dtml-if expr="REQUEST.has_key('check_box') and check_box == 'on'"> Checked! </dtml-if> Note that the second part is completely redundant. <dtml-if expr="REQUEST.has_key('check_box')"> Checked! </dtml-if> Does the same thing. In ZPT, this looks like <span tal:condition="python:request.has_key('check_box')">Checked!</span> Or, more probably <input type="checkbox" name="check_box" tal:attributes="checked request/check_box|nothing" /> Jim Penny
Thanks for the help!
Russell
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