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  /*
   * JBoss, Home of Professional Open Source
   * Copyright , Red Hat, Inc. and individual contributors
   * by the @authors tag. See the copyright.txt in the distribution for a
   * full listing of individual contributors.
   *
   * This is free software; you can redistribute it and/or modify it
   * under the terms of the GNU Lesser General Public License as
   * published by the Free Software Foundation; either version 2.1 of
  * the License, or (at your option) any later version.
  *
  * This software is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with this software; if not, write to the Free
  * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
  */
 package org.richfaces.component;
 
 import  javax.faces.component.UIComponent;
 import  javax.faces.component.UIOutput;
 import  javax.faces.context.FacesContext;
 import  javax.faces.event.AbortProcessingException;
 import  javax.faces.event.ComponentSystemEvent;
 import  javax.faces.event.ListenerFor;
 import  javax.faces.event.PostAddToViewEvent;
 
Adds placeholder capability to HTML input and textarea elements. A placeholder typically appears as light gray text within an input or textarea element whenever the element is empty and does not have focus. This provides a hint to the user as to what the input or textarea element is used for, or the type of input that is required.
 
 @JsfComponent(tag = @Tag(name = "placeholder", type = .), renderer = @JsfRenderer(family = ., type = .), attributes = { "javax.faces.component.ValueHolder.xml" })
 @ListenerFor(systemEventClass = PostAddToViewEvent.class)
 public abstract class AbstractPlaceholder extends UIOutput {
     // ------------------------------ FIELDS ------------------------------
 
     public static final String COMPONENT_FAMILY = "org.richfaces.Placeholder";
 
     public static final String COMPONENT_TYPE = "org.richfaces.Placeholder";
 
     @Attribute(required = true)
     public abstract Object getValue();

    
The jQuery selector used to filter which child DOM elements will be a placeholder attached to.
 
     @Attribute
     public abstract String getSelector();

    
Space-separated list of CSS style class(es) which will be applied to the target input component when placeholder is active.
 
     @Attribute
     public abstract String getStyleClass();

    
Registers component for processing before its parent component when it has empty selector - this logic is used as workaround for text components which does not render children (RF-12589).
 
     @Override
     public void processEvent(ComponentSystemEvent eventthrows AbortProcessingException {
 
         if (event.getSource() == this) {
             if (event instanceof PostAddToViewEvent) {
 
                 // only for nested usage (workaround for RF-12589)
                 if (this.getSelector() == null || this.getSelector().isEmpty()) {
                     UIComponent component = ((PostAddToViewEvent) event).getComponent();
                     UIComponent parent = component.getParent();
 
                     new PlaceholderParentPreRenderListener(parentcomponent);
                 }
             }
         }
 
         super.processEvent(event);
     }

    
Renders component before its parent.
 
     private static class PlaceholderParentPreRenderListener extends PreRenderParentListener {
 
         private static final long serialVersionUID = 1870218106060075543L;
        public PlaceholderParentPreRenderListener(UIComponent parent, UIComponent component) {
            super(parentcomponent);
        }
        @Override
        protected void preRenderParent(FacesContext facesContext, UIComponent component) {
            AbstractPlaceholder placeholder = (AbstractPlaceholdercomponent;
            UIComponent parent = component.getParent();
            PlaceholderRendererBase renderer = (PlaceholderRendererBaseplaceholder.getRenderer(facesContext);
            if (parent instanceof InplaceComponent) {
                if (placeholder.isRendered() && placeholder.getValue() != null) {
                    // backup defaultLabel attribute
                    ValueExpression originalExpression = parent.getValueExpression("defaultLabel");
                    if (originalExpression != null) {
                        parent.getAttributes().put("originalDefaultLabel"originalExpression);
                    } else if (((InplaceComponent) parent).getDefaultLabel() != null) {
                        parent.getAttributes().put("originalDefaultLabel", ((InplaceComponent) parent).getDefaultLabel());
                    }
                    String text = renderer.getConvertedValue(facesContextplaceholder);
                    ((InplaceComponent) parent).setDefaultLabel(text);
                } else {
                    Object defaultLabel = parent.getAttributes().get("originalDefaultLabel");
                    ((InplaceComponent) parent).setDefaultLabel(null);
                    if (defaultLabel instanceof ValueExpression) {
                        parent.setValueExpression("defaultLabel", (ValueExpressiondefaultLabel);
                    } else if (defaultLabel != null) {
                        ((InplaceComponent) parent).setDefaultLabel((StringdefaultLabel);
                    }
                }
            } else {
                try {
                    if (component.isRendered()) {
                        renderer.doEncodeEnd(facesContext.getResponseWriter(), facesContextcomponent);
                    }
                } catch (Exception e) {
                    throw new IllegalStateException("Rendering of placeholder before its parent has failed"e);
                }
            }
        }
    }
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