org.apache.myfaces.custom.inputTextHelp.HtmlTextHelpRenderer Maven / Gradle / Ivy

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JSF components and utilities that can be used with any JSF implementation. This library is based on the JSF1.1 version of Tomahawk, but with minor source code and build changes to take advantage of JSF1.2 features. A JSF1.2 implementation is required to use this version of the Tomahawk library.
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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.myfaces.custom.inputTextHelp;

import java.io.IOException;

import javax.faces.component.UIComponent;
import javax.faces.component.UIInput;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;
import javax.faces.convert.ConverterException;

import org.apache.myfaces.renderkit.html.util.AddResource;
import org.apache.myfaces.renderkit.html.util.AddResourceFactory;
import org.apache.myfaces.shared_tomahawk.renderkit.html.HTML;
import org.apache.myfaces.shared_tomahawk.renderkit.RendererUtils;
import org.apache.myfaces.shared_tomahawk.renderkit.JSFAttr;
import org.apache.myfaces.shared_tomahawk.renderkit.html.HtmlRendererUtils;
import org.apache.myfaces.renderkit.html.ext.HtmlTextRenderer;

/**
 * @JSFRenderer
 *   renderKitId = "HTML_BASIC"
 *   family = "javax.faces.Input"
 *   type = "org.apache.myfaces.TextHelp"
 * 
 * @author Thomas Obereder
 * @version Date: 09.06.2005, 22:50:48
 */
public class HtmlTextHelpRenderer extends HtmlTextRenderer
{
    private static final String JAVASCRIPT_ENCODED = "org.apache.myfaces.inputTextHelp.JAVASCRIPT_ENCODED";

    protected void renderNormal(FacesContext facesContext, UIComponent component) throws IOException
    {
        if(component instanceof HtmlInputTextHelp)
        {
            HtmlInputTextHelp helpTextComp = (HtmlInputTextHelp) component;
            addJavaScriptResources(facesContext);
            renderInputTextHelp(facesContext, helpTextComp);
        }
        else
        {
            super.renderNormal(facesContext, component);
        }
    }

    public static boolean isSelectText(UIComponent component)
    {
        if(component instanceof HtmlInputTextHelp)
        {
            HtmlInputTextHelp helpTextComp = (HtmlInputTextHelp) component;
            return helpTextComp.isSelectText();
        }
        return false;
    }

    public static String getHelpText(UIComponent component)
    {
        if(component instanceof HtmlInputTextHelp)
        {
            HtmlInputTextHelp helpTextComp = (HtmlInputTextHelp) component;
            if(helpTextComp.getHelpText() != null)
                return helpTextComp.getHelpText();
        }
        return null;
    }

    public void renderInputTextHelp(FacesContext facesContext, UIInput input)
            throws IOException
    {
        ResponseWriter writer = facesContext.getResponseWriter();

        writer.startElement(HTML.INPUT_ELEM, input);

        writer.writeAttribute(HTML.ID_ATTR, input.getClientId(facesContext), null);
        writer.writeAttribute(HTML.NAME_ATTR, input.getClientId(facesContext), null);
        writer.writeAttribute(HTML.TYPE_ATTR, HTML.INPUT_TYPE_TEXT, null);

        renderHelpTextAttributes(input, writer, facesContext);

        String value = RendererUtils.getStringValue(facesContext, input);
        value = (value==null || value.length()==0) ? getHelpText(input) : value;

        if (value != null)
        {
            writer.writeAttribute(HTML.VALUE_ATTR, value, JSFAttr.VALUE_ATTR);
        }

        writer.endElement(HTML.INPUT_ELEM);
    }

    private void renderHelpTextAttributes(UIComponent component,
                                          ResponseWriter writer,
                                          FacesContext facesContext)
            throws IOException
    {
        if(!(component instanceof HtmlInputTextHelp) || getHelpText(component) == null || ("").equals(getHelpText(component).trim()))
        {
            HtmlRendererUtils.renderHTMLAttributes(writer, component, HTML.INPUT_PASSTHROUGH_ATTRIBUTES_WITHOUT_DISABLED);
        }
        else
        {
            String id = component.getClientId(facesContext);
            HtmlInputTextHelp textHelp = (HtmlInputTextHelp)component;
            
            HtmlRendererUtils.renderHTMLAttributes(writer, component,
                                                   HTML.INPUT_PASSTHROUGH_ATTRIBUTES_WITHOUT_DISABLED_AND_ONFOCUS_AND_ONCLICK);
            writer.writeAttribute(HTML.ONFOCUS_ATTR,
                                  buildJavascriptFunction(component, id, textHelp.getOnfocus()), null);
            writer.writeAttribute(HTML.ONCLICK_ATTR,
                                  buildJavascriptFunction(component, id, textHelp.getOnclick()), null);
        }

        if (isDisabled(facesContext, component))
        {
            writer.writeAttribute(HTML.DISABLED_ATTR, Boolean.TRUE, null);
        }
    }
    
    private String buildJavascriptFunction(UIComponent component, String id, String componentScript) 
    {
        StringBuffer jsFunction = new StringBuffer();
        if(isSelectText(component))
        {
            jsFunction.append(HtmlInputTextHelp.JS_FUNCTION_SELECT_TEXT);
            jsFunction.append("('");
            jsFunction.append(    getHelpText(component)).append("', '");
            jsFunction.append(    id);
            jsFunction.append("')");
        }
        else
        {
            jsFunction.append(HtmlInputTextHelp.JS_FUNCTION_RESET_HELP );
            jsFunction.append("('");
            jsFunction.append(    getHelpText(component)).append("', '");
            jsFunction.append(    id);
            jsFunction.append("')");
        }
        
        if(componentScript != null && !("").equals(componentScript.trim())) {
            jsFunction.append(";");
            jsFunction.append(componentScript);
        }
        
        return jsFunction.toString();
    }

    public void decode(FacesContext facesContext, UIComponent component)
    {
        super.decode(facesContext, component);
    }

    public Object getConvertedValue(FacesContext facesContext, UIComponent component, Object submittedValue) throws ConverterException
    {
        if(submittedValue!=null && component instanceof HtmlInputTextHelp &&
           ((HtmlInputTextHelp) component).getHelpText()!=null &&
           submittedValue.equals(((HtmlInputTextHelp) component).getHelpText()))
        {
            submittedValue = "";
        }

        return super.getConvertedValue(facesContext, component, submittedValue);
    }

    public static void addJavaScriptResources(FacesContext facesContext)
    {
        // check to see if javascript has already been written (which could happen if more than one calendar on the same page)
        if (facesContext.getExternalContext().getRequestMap().containsKey(JAVASCRIPT_ENCODED))
        {
            return;
        }

        AddResourceFactory.getInstance(facesContext).addJavaScriptAtPosition(
                facesContext, AddResource.HEADER_BEGIN, HtmlTextHelpRenderer.class, "inputTextHelp.js");

        facesContext.getExternalContext().getRequestMap().put(JAVASCRIPT_ENCODED, Boolean.TRUE);
    }
}