RemoveComponentBean.java

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package com.sun.faces.test.servlet30.dynamic;

import javax.faces.application.FacesMessage;
import javax.faces.bean.ManagedBean;
import javax.faces.component.UIComponent;
import javax.faces.component.UINamingContainer;
import javax.faces.context.FacesContext;
import javax.faces.event.ComponentSystemEvent;
import javax.faces.validator.ValidatorException;

@ManagedBean(name = "removeComponentBean")
public class RemoveComponentBean {

    public void validateDeletion(FacesContext context, UIComponent comp, Object value) {
        UIComponent button = findButton(context);
        if (button != null) {
            throw new ValidatorException(new FacesMessage("cbutton should not be found"));
        }
    }

    public void removePreRenderComponent(ComponentSystemEvent event) {
        FacesContext context = FacesContext.getCurrentInstance();

        UIComponent buttonParent;
        UIComponent button = findButton(context);

        if (button != null) {
            buttonParent = button.getParent();
            buttonParent.getChildren().remove(button);
        }
    }

    private UIComponent findButton(FacesContext context) {
        char sep = UINamingContainer.getSeparatorChar(context);
        UIComponent result = context.getViewRoot().findComponent(sep + "form" + sep + "cbutton");
        return result;
    }
}