I have complete something similar using javascript. Here is good description 
and example 

http://www.hotwaxmedia.com/apache-ofbiz-blog/ofbiz-tutorial-dependent-selects-for-prototype/

I am using it for Country/State lists. 


Thanks and Regards
Anil Patel
HotWax Media Inc
Find us on the web at www.hotwaxmedia.com or Google Keyword "ofbiz"

On Jul 1, 2010, at 7:47 PM, Jacques Le Roux wrote:

> To be clear, I'd like to introduce a dependent dropdows mechanism in widgets.
> I'm quite sure it's not easy, not sure it's even feasible at this stage...
> 
> Jacques
> 
> From: <[email protected]>
>> Author: jleroux
>> Date: Thu Jul  1 14:05:21 2010
>> New Revision: 959673
>> 
>> URL: http://svn.apache.org/viewvc?rev=959673&view=rev
>> Log:
>> Adds a getAssociatedProductsList method. I will certainly add the companions 
>> service and request later in the Product application.
>> I have also the vague desire to generalize this more, as I have been able to 
>> quickly use it in a widget form following the
>> Freemarker way already used.
>> 
>> Modified:
>>   ofbiz/trunk/framework/common/src/org/ofbiz/common/CommonWorkers.java
>> 
>> Modified: 
>> ofbiz/trunk/framework/common/src/org/ofbiz/common/CommonWorkers.java
>> URL:
>> http://svn.apache.org/viewvc/ofbiz/trunk/framework/common/src/org/ofbiz/common/CommonWorkers.java?rev=959673&r1=959672&r2=959673&view=diff
>> ==============================================================================
>> --- ofbiz/trunk/framework/common/src/org/ofbiz/common/CommonWorkers.java 
>> (original)
>> +++ ofbiz/trunk/framework/common/src/org/ofbiz/common/CommonWorkers.java Thu 
>> Jul  1 14:05:21 2010
>> @@ -33,6 +33,7 @@ import org.ofbiz.entity.GenericValue;
>> import org.ofbiz.entity.condition.EntityCondition;
>> import org.ofbiz.entity.condition.EntityExpr;
>> import org.ofbiz.entity.condition.EntityOperator;
>> +import org.ofbiz.entity.util.EntityUtil;
>> 
>> /**
>> * Common Workers
>> @@ -135,6 +136,35 @@ public class CommonWorkers {
>>        return geoList;
>>    }
>> 
>> +    public static List<GenericValue> getAssociatedProductsList(Delegator 
>> delegator, String productCategoryId) {
>> +        return getAssociatedProductsList(delegator, productCategoryId, 
>> null);
>> +    }
>> +
>> +    /**
>> +     * Returns a list of active related products for a product category
>> +     */
>> +    public static List<GenericValue> getAssociatedProductsList(Delegator 
>> delegator, String productCategoryId, String listOrderBy)
>> {
>> +        List<GenericValue> products = FastList.newInstance();
>> +        if (UtilValidate.isNotEmpty(productCategoryId)) {
>> +            EntityCondition productsFindCond = 
>> EntityCondition.makeCondition(
>> +                    EntityCondition.makeCondition("productCategoryId", 
>> productCategoryId));
>> +
>> +            if (UtilValidate.isEmpty(listOrderBy)) {
>> +                listOrderBy = "sequenceNum";
>> +            }
>> +            List<String> sortList = UtilMisc.toList(listOrderBy);
>> +
>> +            try {
>> +                products = delegator.findList("ProductCategoryMember", 
>> productsFindCond, null, sortList, null, true);
>> +                products = EntityUtil.filterByDate(products);
>> +            } catch (GenericEntityException e) {
>> +                Debug.logError(e, "Cannot lookup ProductCategoryMember", 
>> module);
>> +            }
>> +        }
>> +
>> +        return products;
>> +    }
>> +
>>    /**
>>     * A generic method to be used on Type enities, e.g. ProductType.  
>> Recurse to the root level in the type hierarchy
>>     * and checks if the specified type childType has parentType as its 
>> parent somewhere in the hierarchy.
>> 
>> 
> 
> 

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