enforcing choice for input fields

I'm trying to figure out how to enforce a strict
choice between two input fields in XForms -- that is,
you must choose one or the other, but not both (no, I
don't need a drop-down box here, I need input fields
for text).

Currently I've got this working as a XForms switch,
but that doesn't really present the user interface
that I want, because it only presents one field to
begin with and the user has to click a button to bring
up the other.

What I want is a way to present both fields initially,
but then set relevance to false if the user types
content into the other field. I've tried to accomplish
this using a bind statement that tests for text nodes,
but I can't get that to work.

Anyone have any ideas or examples to suggest?

Thanks,

Don


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Don,

> What I want is a way to present both fields initially,
> but then set relevance to false if the user types
> content into the other field. I've tried to accomplish
> this using a bind statement that tests for text nodes,
> but I can't get that to work.

You could use xforms:group to display or hide controls dynamically. It
may look as follows:

<xforms:group ref=".[/text2 = '']">
     <xforms:input ref="/text1" incremental="true" />
</xforms:group>
<xforms:group ref=".[/text1 = '']">
     <xforms:input ref="/text2" incremental="true" />
</xforms:group>

If the initial instance elements text1 and text2 are empty, both
conditions are true(), so both fields are shown. As soon as the users
writes some text into /text1, the second group condition will be
false(), so the input field disappears. If the text in /text1 gets
removed, the /text2 field should reappear again.

HTH
florian




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