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The Standard Facelets Composite Component Library Quick Reference (continued)
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The Standard JSF Component Library
FIGURE 16-2 A rendering of a composite component
Example Project
The following XHTML markup and Java source code is an example project that demonstrates how to build a Facelet composite component that uses most of the tags in the Standard Facelets Composite Component Library Figure 16-2 shows a screen shot of the composite component when viewed with a Web browser The following Facelet composite component source markup would exist in a file named inputColorxhtml and would be placed in a subfolder named resources/testcc relative to the Web application docroot Its purpose is to be an Ajax-enhanced reusable component for selecting a color Page authors would create instances of this component with the <testcc:inputColor /> tag in a using page The cc:interface section describes the usage contract for the component The cc:implementation section contains the inner workings of the component that implements the contract
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 10 Transitional//EN" "http://wwww3org/TR/xhtml1/DTD/xhtml1-transitionaldtd"> <ui:component xmlns="http://wwww3org/1999/xhtml" xmlns:c="http://javasuncom/jsp/jstl/core" xmlns:f="http://javasuncom/jsf/core" xmlns:h="http://javasuncom/jsf/html" xmlns:ui="http://javasuncom/jsf/facelets" xmlns:cc="http://javasuncom/jsf/composite"> <cc:interface> <cc:attribute name="value" required="true" type="comexamplejsfColor"> <cc:attribute name="red" required="true" /> <cc:attribute name="green" required="true" /> <cc:attribute name="blue" required="true" /> </cc:attribute> <cc:actionSource name="colorPalette" targets="redSelector greenSelector blueSelector" />
PART III
Composite Component Source Markup
Part III:
JavaSer ver Faces Tools and Libraries
<cc:editableValueHolder name="colorFields" targets="redInputText greenInputText blueInputText" /> <cc:extension> <some-jsr-276-meta-data /> </cc:extension> <cc:facet name="header" required="true" /> </cc:interface> <cc:implementation> <cc:renderFacet name="header" /> <f:ajax render="preview kids"> <h:panelGrid columns="2"> <h:outputLabel value="R:" /> <h:inputText id="redInputText" value="#{ccattrsvaluered}"> <f:validateLongRange minimum="0" maximum="255" /> </h:inputText> <h:outputLabel value="G:" /> <h:inputText id="greenInputText" value="#{ccattrsvaluegreen}"> <f:validateLongRange minimum="0" maximum="255" /> </h:inputText> <h:outputLabel value="B:" /> <h:inputText id="blueInputText" value="#{ccattrsvalueblue}"> <f:validateLongRange minimum="0" maximum="255" /> </h:inputText> </h:panelGrid> </f:ajax> <h:outputText value="Color Preview: " /> <c:set value="#{ccattrsvaluered}" var="red" /> <c:set value="#{ccattrsvaluegreen}" var="green" /> <c:set value="#{ccattrsvalueblue}" var="blue" /> <c:set value="#{red},#{green},#{blue}" var="rgb" /> <h:outputText id="preview" value=" " style="border: 1px solid; padding: 1px 10px; background-color: rgb(#{rgb});" /> <f:ajax render="redInputText greenInputText blueInputText preview kids"> <h:panelGrid border="1" columns="3"> <f:facet name="header"> <h:outputText value="Color Palette" /> </f:facet> <h:commandLink id="redSelector" value="Red"> <f:setPropertyActionListener target="#{ccattrsvaluered}" value="255" /> <f:setPropertyActionListener target="#{ccattrsvaluegreen}" value="0" /> <f:setPropertyActionListener target="#{ccattrsvalueblue}" value="0" /> </h:commandLink> <h:commandLink id="greenSelector" value="Green"> <f:setPropertyActionListener target="#{ccattrsvaluered}" value="0" />
16:
The Standard JSF Component Library
<f:setPropertyActionListener target="#{ccattrsvaluegreen}" value="255" /> <f:setPropertyActionListener target="#{ccattrsvalueblue}" value="0" /> </h:commandLink> <h:commandLink id="blueSelector" value="Blue"> <f:setPropertyActionListener target="#{ccattrsvaluered}" value="0" /> <f:setPropertyActionListener target="#{ccattrsvaluegreen}" value="0" /> <f:setPropertyActionListener target="#{ccattrsvalueblue}" value="255" /> </h:commandLink> </h:panelGrid> </f:ajax> <br /> <h:panelGroup id="kids"> <cc:insertChildren /> </h:panelGroup> </cc:implementation> </ui:component>
PART III
Using Page Source Markup
The following Facelet view markup would exist in a file named usingPagexhtml and would be placed in the Web application docroot folder It shows how to create an instance of the testcc:inputColor composite component It also shows how to connect it to a JSF model managed bean that is kept in JSF 20 View scope, which is necessary in order to keep model managed bean properties in memory for successive Ajax requests
< xml version="10" encoding="UTF-8" > <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 10 Transitional//EN" "http://wwww3org/TR/xhtml1/DTD/xhtml1-transitionaldtd"> <f:view xmlns="http://wwww3org/1999/xhtml" xmlns:f="http://javasuncom/jsf/core" xmlns:h="http://javasuncom/jsf/html" xmlns:testcc="http://javasuncom/jsf/composite/testcc" xmlns:ui="http://javasuncom/jsf/facelets"> <h:head /> <h:body> <h:form> <h:messages /> <testcc:inputColor value="#{testManagedBeancolor}"> <f:facet name="header"> <h:outputText value="Please choose a color" /> </f:facet> <f:actionListener for="colorPalette" type="comexamplejsfColorActionListener" /> <f:valueChangeListener for="colorFields" type="comexamplejsfColorValueChangeListener" />
Part III:
JavaSer ver Faces Tools and Libraries
<!-The following h:panelGrid will be used by the cc:insertChildren tag in the cc:implementation section of the testcc:inputColor composite component --> <h:panelGrid columns="2"> <f:facet name="header"> <h:outputText value="You Selected: " /> </f:facet> <h:outputLabel value="Red:" /> <h:outputText value="#{testManagedBeancolorred}" /> <h:outputLabel value="Green:" /> <h:outputText value="#{testManagedBeancolorgreen}" /> <h:outputLabel value="Blue:" /> <h:outputText value="#{testManagedBeancolorblue}" /> </h:panelGrid> </testcc:inputColor> <br /> <h:commandButton value="Submit" /> </h:form> </h:body> </f:view>
Color Class Source Code
The following Java source code would be a class named Colorjava and provides a way to specify a color using a Red, Green, Blue (RGB) definition
package comexamplejsf; public class Color { private int red; private int green; private int blue; public int getRed() { return red; } public void setRed(int red) { thisred = red; } public int getGreen() { return green; } public void setGreen(int green) { thisgreen = green; }
16:
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