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Friday, 29 May 2015

Apply Client/Server listener to programmatically created components, apply JavaScript to ADF Faces components at run time

Hello All

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 
Apply ActionListener to programmatically created buttons/link in ADF

Now this post is about applying client listener & server listener (to execute some javascript function) to a programmatically created component (inputText, outputText etc)

Let's see the implementation part (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 an inputText programmatically
  • To create new inputText 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);
        }
    


            //Code to create af:inputText and add it to panelgroup layout
            RichInputText ui = new RichInputText();
            ui.setValue("Programmatically Created Input Text");
            ui.setId("pit1");
            ui.setContentStyle("width:200px;color:navy");
            //getParentGroupLayoutBind is the component binding of parent panel group layout
            addComponent(getParentGroupLayoutBind(), ui);
    

  • Now first part is done - Creation of input text , next is to assign client and server listener to it
    So for that first we have to add some JavaScript function in page that will be called using clientListener
    I have added this JavaScript function in page, it just fires a custom event from client and pass component value as parameter

  •         function demoJsFunction(evt){
              var comp = evt.getSource();
              alert(comp);
              AdfCustomEvent.queue(comp, "ServerEventToGetValue", {fvalue:comp.getSubmittedValue()}, true);
              evt.cancel();
            }
          
    

  • One more thing is to define server listener method in managed bean so that we can apply it to inputText at run time

  •     /**Server Listener - It will be called on execution of client side javascript
         * @param clientEvent
         */
        public void testServerListener(ClientEvent clientEvent) {
            //To get value passed from Client Event
            String val = clientEvent.getParameters().get("fvalue").toString();
            FacesMessage msg=new FacesMessage("Server Listener Called and value in inputText is - " + val);
            msg.setSeverity(FacesMessage.SEVERITY_INFO);
            FacesContext.getCurrentInstance().addMessage(null, msg);
           
        }
    

  • Now create clientListener/ServerListener programmatically and assign both to inputText
    Pass server listener method name along with managed bean name

  •         // Create new Client Listener and assign method name and type
            ClientListenerSet CL = new ClientListenerSet();
            CL.addListener("click", "demoJsFunction");
            //Add Server listener , assign client event name and resolve pre-defined serverlistener
            CL.addCustomServerListener("ServerEventToGetValue",
                                       getMethodExpression("#{viewScope.Testbean.testServerListener}"));
    
            // Add clientListener/ServeListener to inputText
            ui.setClientComponent(true);
            ui.setClientListeners(CL);
    

    Helper method to resolve expression-

        /**To Resolve ServerListener method
         * @param s
         * @return
         */
        public MethodExpression getMethodExpression(String s) {
    
            FacesContext fc = FacesContext.getCurrentInstance();
            ELContext elctx = fc.getELContext();
            ExpressionFactory elFactory = fc.getApplication().getExpressionFactory();
            MethodExpression methodExpr = elFactory.createMethodExpression(elctx, s, null, new Class[] {
                                                                           ClientEvent.class });
            return methodExpr;
    
        }
    

  • All done , now run application and check , click on button it will create a inputText
         now click on input text and see server listener is called :)

This is how we can apply javascript in programmatic created components
Cheers :) Happy Learning

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