Need help with dependent lists boxes with ADF.

Question

Hello,
I am doing a project that use tree dependent list boxes.
Ex. State---->
College---->
List of courses of the college chosen above----->
The way this should work is when I select the state automatically I want it to change to the correspondent list of colleges of that state and after i choose the colleges I want to be able to get all the courses that are given in that college.
To implement the first two list boxes I create tree views on JDeveloper and and using SelectOneChoice for both State and Colleges. In the binding editor I bind the first View with the second and then the second view with the third and at this point if I execute the first SelectOneChoice would give me all the state and the second SelectOneChoice would give me the list of all the colleges that exist.
Now on the third view that I create a binding variable and i put a Where state=:TheBindingVariable on the query.
Also I set the first SelectOneChoice the outoSubmit property to true, id to StateId and PartialTrigger property to CollegeId.
On pageDef.xml in the bindings I create action form where I select the third view from Date Collection and select Action as ExecuteWithParams. And I set the value under the parameters section to #{bindings.state.inputValue}.
Under executables still in pageDef.xml I create a invokeAction and I set binds = ExecuteWithParams.
On first SelectOneChoice on the ChangeValueListener i create a new ManageBeans which generate me a java class and I create a new method as well to use it to change the binding variable on the second SelectOneChoice.
Here is the method:
public void Change_StateId(ValueChangeEvent valueChangeEvent) {
String StateId;
valueChangeEvent.setPhaseId(PhaseId.INVOKE_APPLICATION);
FacesContext adi = FacesContext.getCurrentInstance();
ValueBinding vb = adi.getApplication().createValueBinding("#{bindings}");
DCBindingContainer bc = (DCBindingContainer)vb.getValue(adi);
if(valueChangeEvent.getNewValue().toString().equals("0")){
StateId = "MA";
OperationBinding opBindingCollegeLovIter = (OperationBinding) bc.get("ExecuteWithParams");
opBindingCollegeLovIter.getParamsMap().put("TheState",StateId);
opBindingCollegeLovIter.execute();
}else{
DCIteratorBinding statesLovIter = (DCIteratorBinding) bc.get("CollegeProvaView1Iterator");
Row rw = statesLovIter.getRowAtRangeIndex(((Integer)valueChangeEvent.getNewValue()).intValue());
StateId = (String) rw.getAttribute("State");
OperationBinding opBindingCollegeLovIter = (OperationBinding) bc.get("ExecuteWithParams");
opBindingCollegeLovIter.getParamsMap().put("TheState",StateId);
opBindingCollegeLovIter.execute();
I don't know what I have done wrong because I am new in this field and a little support would be really helpful.
I am using JDeveloper 10.1.3.1.0 and Oracle SOA Suite 10.1.3.1.0.
I would appreciate any help.
Thanks a lot.

Answer 1

user8116089 wrote:
For some reason the first selectonechoice doesn't give me all the states that are in the database it gives me just the first 10.check the value of RangeSize for itarator in pageDef. in this case to show all items it must be set to -1
Also there is a way to assign the first value of the first selectonechoice to null at the start.this is a problematic requirement since all items are bound to iterator and basically this should serve for navigation purpose so the first item is set as selected, but maybe some workaround exists...
regards,
Branislav