Validation of multiple <rich:listShuttle> items

[jakeclarkson87]

Hi there,

I have a requirement where a user must select at least one item from three <rich:listShuttle> elements, i.e. two <rich:listShuttle> elements may be empty but not all three.

What is the best way of validating this within the RichFaches / JSF framework?

Many thanks.

[jakeclarkson87]

I have now resolved this issue.

In my validation I was able to get the value as follows; I needed to check that the a collection of three <rich:listShuttle> elements had at least one element selected between them, I acheived this as follows.

ArrayList selectedElements1 = (ArrayList) this.availableElementsShuttle1.getTargetValue();
ArrayList selectedElements2 = (ArrayList) this.availableElementsShuttle2.getTargetValue();
ArrayList selectedElements3 = (ArrayList) this.availableElementsShuttle3.getTargetValue();

if (selectedElements1 != null && selectedElements1.isEmpty()
        && selectedElements2 != null && selectedElements2.isEmpty() 
        && selectedElements3 != null && selectedElements3.isEmpty()) {
    // throw ValidatorException as all the listShuttle elements are empty
}

The availableElementsShuttlex Objects are UIListShuttle instances bound to <rich:listShuttle> elements in the XHTML via the binding attribute. A hidden field was used with a validator attribute which points to a method which houses the code above.