Cascaded LOV issue

Question

Hi,
I have a cascaded LOVs. Ideally it should work like this.
Select a value from the first combo box LOV and based on the value selected, populate the second LOV and so on.
When first LOV changes, in the second LOV, the first element should get selected by default. However this is not happening. Instead user is forced to choose an option from the LOV manually.
Any help in how to select the first element in the LOV automatically?
Regards,
Raghu

Answer 1

Hi,
The solution shouldn't be that complicate. Just create a valueChangeListener in your first LOV's component.
You need to update your model in the valueChangeEvent with your new value of yourFirstLOV:
    public void countryChanged(ValueChangeEvent valueChangeEvent) {
        ADFUtils.setValueToEL("#{bindings.yourFirstLOV.inputValue}",valueChangeEvent.getNewValue());
        ADFUtils.setValueToEL("#{bindings.yourSecondLOV.inputValue}",0);
   The value for LOV are actually the indexes on the list of the element.
If you are no using ADFUtils here is the implementation of that method:
    public static void setValueToEL(String el, Object val) {
        FacesContext facesContext = FacesContext.getCurrentInstance();
        ELContext elContext = facesContext.getELContext();
        ExpressionFactory expressionFactory =   facesContext.getApplication().getExpressionFactory();
        ValueExpression exp = expressionFactory.createValueExpression(elContext, el, Object.class);
        exp.setValue(elContext, val);
    }   Try this and post your results. Then only bad thing I can see from this is that if your name's bindings ever change (for example, change from yourSecondLOV to yourSecondLOV2) then you will have to update the java code.
Regards
Sorry, I had to edit because I made a mistake, now you should be able to try and post your results
Edited by: Alejandro T. Lanz on Mar 4, 2013 8:41 AM