I know that when an element is validated (because there is a type, constraint, or required attribute on a bind expression pointing to that element in the XForms model), the XForms engine adds an xxforms:valid="true|false" attribute to the element. I can access this attribute anywhere I have access to the XForms instance.
My question is - Is there any way to know which particular validation/bind expression (constraint, required or anything else) made the element invalid? My intention is to display appropriate <xforms:alert> message which makes user understand exactly what went wrong. User is not convinced to see all <xforms:alert> messages associated with an element while only one of the many possible constraints is failed.
Rahul,
Make sure you have an "id" attribute on your "bind" elements, for instance:
<xforms:bind id="a" nodeset="/instance" constraint="false()"/>
Then when validation fails, an "xxforms:invalid-bind-ids" attribute is added in addition to the "xxforms:valid" attribute. The value of this element is the id of the "bind" that failed. For instance:
<instance xxforms:invalid-bind-ids="a" xxforms:valid="false"/>
Alex
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