Apply Validator to programmatically created ADF Faces components

Again a post in series of  Working with ADF Faces Components programmatically
Previously i have posted about Getting value , Applying Action Listener , Applying Client/Server Listener, Creating and applying client Attributes, Setting value expression  to programmatically created component
Now this post post is about applying Validator to a component that is created at run time
See how to do this (Jdev 12.1.3)-

• 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 and assign validator method reference to it
• To create new inputText i have added following code (described in previous post)




/**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.setId("pit1");
        ui.setContentStyle("width:200px;color:navy");
        //getParentGroupLayoutBind is the component binding of parent panel group layout
        addComponent(getParentGroupLayoutBind(), ui);




• Next step is to create a validator method in managed bean to validate this inputText value, So i have created a validator method in managed bean that will check that inputText value should not be greater than 100




    /**Validator method to be applied on programmatically created inputText
     * @param facesContext
     * @param uIComponent
     * @param object
     */
    public void testValidator(FacesContext facesContext, UIComponent uIComponent, Object object) {
        if (object != null) {
            Integer val = Integer.parseInt(object.toString());
            if (val > 100) {
                throw new ValidatorException(new FacesMessage("Invalid Value","Must be less than 100"));
            }
        }
    }




• Now assign this validator method to programmatically created inputText, see how to do this
  Helper method to resolve Validator (import javax.faces.validator.Validator)




//Packages used
   
import javax.el.ELContext;
import javax.el.ExpressionFactory;
import javax.faces.application.Application;
import javax.el.MethodExpression;
import javax.faces.context.FacesContext;
import javax.faces.component.UIComponent;
import javax.faces.validator.MethodExpressionValidator;



/**Method to to resolve Validator method
     * @param actionName
     */
    private Validator resolveValidator(String validatorName) {
        //Validator method takes 3 argument of following type , we have to define that
        Class[] argtypes = new Class[3];
        argtypes[0] = FacesContext.class;
        argtypes[1] = UIComponent.class;
        argtypes[2] = Object.class;
        FacesContext facesCtx = FacesContext.getCurrentInstance();
        Application app = facesCtx.getApplication();
        ExpressionFactory elFactory = app.getExpressionFactory();
        ELContext elContext = facesCtx.getELContext();
        MethodExpression methodExp = elFactory.createMethodExpression(elContext, validatorName, null, argtypes);
        return new MethodExpressionValidator(methodExp);
    }



To apply this validator to inputText just write this - Pass exact el reference of bean validator method to resolveValidator method



//Pass string that contains proper el reference of Validator method 
ui.addValidator(resolveValidator("#{viewScope.Testbean.testValidator}"));




• All done :) Run and check application , On button click an inputText is created, i have entered a value greater than 100 and see the result

Cheers:) Happy Learning