[Zope] Disabling buttons

[Ethan Fremen]

Paul Prescod wrote:
> 
> I'm taking over an app that uses a bunch of client side Java. The only
> reason I can see it uses Java is because it allows you to build logic
> like "if this radio button is selected, this checkbox is disabled." If
> there was a way to do this in a combination of DTML and Javascript then
> the app could use just those technologies. Has anyone got a demo of
> something like that? I can think of fairly convoluted ways to do it --
> is there a straightforward way?

This is actually quite straightforward in the HTML 4.0 spec.  Section 17
discusses forms.

17.12.1 Disabled controls:

The following elements support the disabled attribute: BUTTON INPUT,
OPTGROUP, OPTION, SELECT, and TEXTAREA.

eg: <INPUT disabled name="fred" value="stone">

Note: the only way to dynamically modify the value of the disabled
attribute is through a script.
...
I don't know the exact javascript to do this, but it should be pretty
straightforward.

I imagine you can do this server-side with dtml, but with javascript it
would be all client-side.

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