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From Ralph Rauscher <>
Subject Re: Field widget selection lists
Date Tue, 17 Apr 2007 19:48:43 GMT
Grzegorz Kossakowski wrote:
> Ralph Rauscher napisaƂ(a):
>> Thanks Grzegorz! Actually I was thinking about using Unions. In my case
>> however this would make things more complicated. One of several reasons
>> being that the selection list for my A widget gets filled dynamically.
>> Now the set of possible values for my A widget is pretty much unlimited.
>> That way I cannot setup union cases in my model as I do not know all
>> possible values up-front.
> I see.
>> Anyone knows if removing a selection list from a widget is possible or
>> maybe if it's intentional that there's no such possibility?
> I've peeked at Field's code and do not see any obvious place where setting empty selection
list could be blocked somehow. Look at this:
>     /**
>      * Set this field's selection list.
>      * @param selectionList The new selection list.
>      */
>     public void setSelectionList(SelectionList selectionList) {
>         if (selectionList != null &&
>             selectionList.getDatatype() != null &&
>             selectionList.getDatatype() != getDatatype()) {
>             throw new RuntimeException("Tried to assign a SelectionList that is not associated
with this widget's datatype.");
>         }
>         this.selectionList = selectionList;
>         getForm().addWidgetUpdate(this);
>     }
> I think that setting null selection list is completely valid. Are you sure you do everything
You are right - it's setting the selection list outside the if 
statement. Didn't notice that when initially looking at the code.

Actually I was still having another problem because flowscript gave me an

org.mozilla.javascript.EvaluatorException: The choice of Java method     
    org.apache.cocoon.forms.formmodel.Field.setSelectionList matching 
JavaScript argument types (null) is ambiguous; candidate methods are: 
void setSelectionList(java.lang.String), void 

However, I solved that using


It's working now.

Thank you very much for your assistance Grzegorz.

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