Apply ActionListener to programmatically created buttons/link in ADF

This post is next in series of "Working with ADF Faces Components programmatically"
Previous posts are-
Creating dynamic layout (form and UI Component) using ADF Faces
Get Value from programmatically created components , Iterate over parent component to get child values in ADF Faces

Now this post is about applying ActionListener to a programmatically created button or link
Let's start (Jdev 12.13) -

• First created a FusionWebApplication and a page in viewController project
• Dropped a button on page , on this button action i will create a link programmatically and assign actionListener to it
• To create new link i have added following code (described in previous posts)





    /**Method to add dynamically created component to a parent layout
     * @param parentUIComponent
     * @param childUIComponent
     */
    public void addComponent(UIComponent parentUIComponent, UIComponent childUIComponent) {
        parentUIComponent.getChildren().add(childUIComponent);
        AdfFacesContext.getCurrentInstance().addPartialTarget(parentUIComponent);
    }




       //Creating Link programmatically on button click     
        RichLink ui = new RichLink();
        ui.setId("li1");
        ui.setText("Programmatically Created Link");
        ui.setInlineStyle("font-weight:bold;");
        //Add this link to parent form layout
 //ParentGroupLayoutBind is the component binding of panelGroupLayout
        addComponent(getParentGroupLayoutBind(), ui);



• After this we are able to create a new Link on click of button, now next is to assign ActionListener to this Link
  For this first i have to define an ActionListener method in bean. So i have added this 



    /**Action Listener to be applied on dynamically created button
     * @param actionEvent
     */
    public void actionForProgLink(ActionEvent actionEvent) {
        FacesMessage infoMsg = new FacesMessage("Action Listener Invoked");
        infoMsg.setSeverity(FacesMessage.SEVERITY_INFO);
        FacesContext.getCurrentInstance().addMessage(null, infoMsg);
    }



• Now how to assign this ActionListener to that dynamically created Link?
  See the Code-



    /**Method to to resolve actionListener
     * @param actionName
     */
    private ActionListener getActionListener(String actionName) {
        //here Testbean is the name of ManagedBean
        MethodExpression methodExp = getMethodExpressionForAction("#{viewScope.Testbean." + actionName + "}");
        return new MethodExpressionActionListener(methodExp);
    }


Helper method to resolve ActionListener-

    private MethodExpression getMethodExpressionForAction(String actionName) {
        Class[] argtypes = new Class[1];
        argtypes[0] = ActionEvent.class;

        FacesContext facesCtx = FacesContext.getCurrentInstance();
        Application app = facesCtx.getApplication();
        ExpressionFactory elFactory = app.getExpressionFactory();
        ELContext elContext = facesCtx.getELContext();
        return elFactory.createMethodExpression(elContext, actionName, null, argtypes);
    }


Just pass the name of method to resolve it

   //Apply ActionListener on this dynamically created link 

    ui.addActionListener(getActionListener("actionForProgLink")); 

Now time to check , run application :)
First a button appears-

On click of this button a link is created -

Click on this link- programmatically assigned Action Listener is called

Cheers , Happy Learning :)