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Building Custom UI Components
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<h:body> <h:form> <p><vt:helloworld /></p> </h:form> </h:body> </html>
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Notice that the taglib URI, http://jsfcomprefcom/example, must match the URI defined in the tag library descriptor file Since HtmlHelloWorld doesn t require any attributes, the tag <vt:helloworld/> is all that is needed Now that we ve created a simple, but fully functional component, we can begin adding attributes to the component Because HtmlHelloWorld extends from UIComponentBase, UIComponent properties from the superclass such as id, binding, rendered are already available for use in the Facelet page For example, to test the rendered attribute, one can set the value to be false:
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<vt:helloworld rendered="false"/>
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PART II
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This will cause the UI component to not render in the page With Facelets, there is no need to add any getters or setters on the UIComponent subclass when adding custom attributes Any attributes added by the page author are automatically available in the Map returned from getAttributes( ) Let s add an attribute, hellomsg, which allows the user to specify a custom message to the component The encodeAll( ) method can then use the hellomsg value in the responseWriter methods to display the message when rendered
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@Override public void encodeAll(FacesContext context) throws IOException { ResponseWriter writer = contextgetResponseWriter(); writerstartElement("div", this); writerwriteAttribute("style", "color : red", null ); String message = (String) thisgetAttributes()get("hellomsg"); if (null == message) { writerwriteText("HelloWorld! today is: " + new javautilDate(), null); } else { writerwriteText(message, null); } writerendElement("div"); }
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The Facelet page can now define a custom message in the tag
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<vt:helloworld hellomsg="Hello JSF! "/>
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As the page is run again, the custom message then appears Facelets automatically supports EL for all attributes For example, the code
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<vt:helloworld hellomsg="#{parammsg}"/>
Part II:
Extending JavaServer Faces
will evaluate the expression, allowing the user to provide a request parameter, msg, at runtime and have it display as the message When the page is run with the URL http:// localhost:port/faces/contextroot/helloxhtml msg=HelloAgain!!, the message in the request parameter will be displayed in the page with the UI component Now that HtmlHelloWord can accept an attribute, a possible next step is to use the attribute to do something For example, instead of just printing the value of the hellomsg attribute on the JSP page, a new attribute such as stocksymbol could be added to the component and it could be used as a parameter to a Web service The returned stock value could then be displayed on the page
A HelloWorld UI Component That Accepts Form Input
So far, HtmlHelloWorld can retrieve attributes provided by the tag and can render (encode) itself to a client In this next example, we ll create a new version of the component that accepts form input This new version, called HtmlHelloInput, renders an input field and a button It then processes the incoming value from the input field In general, the process of handling incoming form values from a UI component is known as decoding HtmlHelloInput allows a user to enter some text into the input field and the component will immediately render the entered text onto the page HtmlHelloInput will extend UIInput instead of UIComponentBase It also no longer needs to override the getFamily( ) method, since it s extending UIInput We will need to declare that this component does not have a specific external renderer because it renders itself The declaration of the UI component is now
public class HtmlHelloInput extends UIInput { public HtmlHelloInput() { setRendererType(null); // this component renders itself }
The new HtmlHelloInput has an encodeEnd( ) method that calls three submethods to render the respective subelement of the UI component
NOTE An encodeEnd( ) method was used in this case as opposed to an encodeBegin( ) from before
In general, when a component accepts input, it is best to use an encodeEnd( ) because encodeBegin( ) can be called before a necessary Converter is attached
@Override public void encodeEnd(FacesContext context) throws IOException { String clientId = getClientId(context); char sep = UINamingContainergetSeparatorChar(context); encodeInputField(context, clientId + sep + "inputfield"); encodeSubmitButton(context, clientId + sep + "submit"); encodeOutputField(context); }
Notice that each subelement is supplied with a unique identifier The identifier as derived from the clientId of the root component by appending the naming container separator char and an appropriate literal string
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