[ADF UIX] Dynamically enabling/disabling fields

Question

Hi
Another newbie question.
Does anybody have any pointers on how to dynamically set the read-only property of a messageInputText field dependent on the value of another field in an ADF UIX input-only-form?
To set the scene: I have a VO with the following columns:
1) id
2) subtype (values L or N)
3) field1 (only editable when subtype = L)
4) field2 (only editable when subtype = N)
When the user creates a new record, the subtype will default to L. I need field1 to be enabled and field2 to be disabled. If the user changes the subtype field to N, field1 must be disabled and field2 enabled.
Is this possible? Or is this best left to the spanking new ADF Faces?
(My environment: JDeveloper 9.0.5.2 build 1618)
Thanks!
CM.

Answer 1

Some research reveals one method to do this: EL (Expression Language).
As an example I had the following messageLovInput that I wanted to dynamically make read-only (similar to enabling/disabling) dependent on a value in another field 'InputRequiredInd'. As such the following tag was implemented:
<messageLovInput
model="${bindings.DsvId}"
id="${bindings.DsvId.path}"
destination="dataSetValidationRulesLevelOneLov.uix"
partialRenderMode="multiple"
partialTargets="_uixState"
readOnly="${!empty bindings.InputRequiredInd.inputValue ? false : true}"/>
You'll note in the readOnly element an "EL" expression. Essentially this says if the InputRequiredInd is not empty then return false otherwise true.
A useful reference:
http://www-106.ibm.com/developerworks/java/library/j-jstl0211.html
I hope this is helpful to someone!
Cheers,
CM.