Build selectOneChoice to show hierarchical (tree style) data programmatically in ADF

This post is based on an old article from Frank Nimphius How - to build a select one choice displaying hierarchical selection data

This article is about showing tree structure data in af:selectOneChoice component using ADF BC , it makes use of tree binding and af:forEach
Same concept i have used to populate data from managed bean using List data structure

Let's see the implementation part - how to populate tree style selectOneChoice programatically ?

First we have to design a Java Bean class in such a way that it can hold  master -detail type of data

A class that represents a List for Parent Values
                          ======> A list of same type to hold Child Values

See bean class code-

import java.util.ArrayList;
import java.util.List;

public class Seasons {
    public Seasons(String name) {
        this.name = name; // To Store Header Values (Storing Seasons Name :))
    }
    // Season and Charater Name
    private String name;
    // To Store Detail Values (Storing Season's Charatcers)
    private List<Seasons> characters = new <Seasons>ArrayList();

    public void setCharacters(List<Seasons> empDet) {
        this.characters = empDet;
    }

    public List<Seasons> getCharacters() {
        return characters;
    }


    public void setName(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }
    // This methods directly add characters value in list
    public void addCharaters(Seasons employee) {
        characters.add(employee);
    }
}

Now how to use this bean in managed bean to add records, i have written code in constructor to populate values on class load

    // Master List to populate data in selectOnce choice
    List<Seasons> seasonList = new ArrayList<Seasons>();

    public void setSeasonList(List<Seasons> seasonList) {
        this.seasonList = seasonList;
    }

    public List<Seasons> getSeasonList() {
        return seasonList;
    }
    //Constructor of Managed Bean to populate data on page load (you can move this code )
    public TreeStyleLovBean() {
        super();
        // Creating tree for Seasons and Characters details
        // Adding Master Values (seasons)
        Seasons season1 = new Seasons("Game of Thrones");

        // Adding Detail Values (Child Node-Characters)
        Seasons character = new Seasons("Tywin Lannister");
        season1.addCharaters(character);
        character = new Seasons("Tyrion Lannister");
        season1.addCharaters(character);
        character = new Seasons("Jaime Lannister");
        season1.addCharaters(character);
        character = new Seasons("Cersie Lannister");
        season1.addCharaters(character);
        character = new Seasons("Ned Stark");
        season1.addCharaters(character);

        // Adding Master Values (seasons)
        Seasons season2 = new Seasons("Arrow");

        // Adding Detail Values (Child Node-Characters)
        character = new Seasons("Oliver Queen");
        season2.addCharaters(character);
        character = new Seasons("Moira Queen");
        season2.addCharaters(character);
        character = new Seasons("Laurel Lance");
        season2.addCharaters(character);
        character = new Seasons("Sara Lance");
        season2.addCharaters(character);

        // Adding Master Values (seasons)
        Seasons season3 = new Seasons("Vikings");

        // Adding Detail Values (Child Node-Characters)
        character = new Seasons("Ragnar Lothrak");
        season3.addCharaters(character);

        // Adding Master Values (seasons)
        Seasons season4 = new Seasons("The Flash");

        // Adding Detail Values (Child Node-Characters)
        character = new Seasons("Barry Allen");
        season4.addCharaters(character);
        character = new Seasons("Harisson Wells");
        season4.addCharaters(character);
        character = new Seasons("Iris West");
        season4.addCharaters(character);
        character = new Seasons("Joe");
        season4.addCharaters(character);

        // Adding all list to topList
        seasonList.add(season1);
        seasonList.add(season2);
        seasonList.add(season3);
        seasonList.add(season4);

    }

how to bind this managed bean to selectOneChoice ? i have used same concept as described in Frank's article using af:forEach

<af:selectOneChoice id="selectBox" label="Choose Character" valuePassThru="true"
                                        styleClass="employeeSelectBox" contentStyle="width:150px;"
                                        binding="#{viewScope.TreeStyleLovBean.selectOneValueBind}">
                        <af:forEach items="#{viewScope.TreeStyleLovBean.seasonList}" var="seasonNm">
                            <af:selectItem label="#{seasonNm.name}" disabled="true" id="si1"/>
                            <af:forEach items="#{seasonNm.characters}" var="characterNm">
                                <af:selectItem label="#{characterNm.name}" value="#{characterNm.name}" id="si2"/>
                            </af:forEach>
                        </af:forEach>
                    </af:selectOneChoice>

you can see here that first forEach is populated from master list and iterates over list of seasons and first selectItem show season's name
the inner forEach makes used of character list that is defined in Java Bean class and stores season wise character's name
Rest is same - a CSS is used to differentiate color and alignment of parent and child records (same as Frank's article)

<f:facet name="metaContainer">
                <af:group>
                    <![CDATA[
<style>
.employeeSelectBox option{text-indent:15px;color:darkgreen;}
.employeeSelectBox option[disabled]{color:red; background-color:#dddddd; 
font-weight: bold; text-indent:0px}
</style>
]]>
                </af:group>
            </f:facet>

Now run this application - see how it appears on page

It looks quite good :) to get selected value in bean just use componentBinding.getValue();

Sample ADF Application-Download (Jdev 12.1.3)
Cheers , Happy Learning