Saturday, 16 May 2015

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);
        }
    

    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 :)