Question

I’m having a little problem populating a combo box with struts using the action class..

This is my form element:

<s:select label = "Estado" 
           name = "estados" 
          value = "#estados"
      headerKey = "-1"  
    headerValue = "---Seleccione---" 
           list = "estados"/>

And this is action class:

public class PrepararMedicosAction extends ActionSupport 
                                implements Preparable, ParameterAware{

    public List <Estado> estados;

    private IFachada lookupFachadaRemote() {
        try {
           Context c = new InitialContext();
           return (IFachada) c.lookup("java:global/Fachada/Fachada!com.interfaces.IFachada");
        } catch (NamingException ne) {
           Logger.getLogger(getClass().getName()).log(Level.SEVERE, "exception caught", ne);
           throw new RuntimeException(ne);
        }
    }

    public String display() {
        return NONE;
    }

    @Override
    public void prepare() throws Exception {
        this.estados= fachada.getEstados();
    }
}

Answer 1

Struts2’s Select attribute:

name: the source object (the List in your case) containing the
data you want to show;

listKey: the field used as key in the option element

listvalue: the field used as description in the option element,
visibile on the combobox.

value: the referred element to preset the value.

If name refers to a List<String>, you can use the list attribute to display the strings in both keys and values; if instead, as in your case, name refers to a List<Object>, you have to specify which attribute is the key and which is the value.

Example (let’s translate “Estados” to “States”):

public class State {
    private Long id;
    private String stateName;

    // Getters and Setters here...
}

then expose a List<State> states through a getStates() method,

and your preferred state through getMyPreferredState() method.

In the jsp you will write:

<s:select name = "states" 
         value = "myPreferredState" 
       listKey = "id" 
     listValue = "stateName" 
     headerKey = "-1" 
   headerValue = "Please choose a state..." 
/>