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<h:form> <h:inputText binding="#{backing_helloinputText1}" /> <h:commandButton value="Click Me!" /> <h:outputText value="Hello!" binding="#{backing_hellooutputText1}" /> </h:form>
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The UI component tree bound to the components used in the page
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Now that the components used in the page are bound to component instances declared in a managed bean, you can write code to alter/manipulate the properties of the components For this example, the outputText value is set to the value entered in the inputText component when the button was clicked This can be achieved by creating an action method, commandButton_action( ), which programmatically sets the value of the outputText to the inputText s value as a result of the button being clicked This method can also reside in the same Hellojava backing bean:
public String commandButton_action() { outputText1setValue(inputText1getValue()); return "success"; }
The final step needed for this small application to work is to set the action attribute of the commandButton to the expression referring to the action method This will ensure that the action method commandButton_action( ) is invoked when the button is clicked (As you recall from 3, action methods are actually invoked during the Invoke Application phase of the request processing lifecycle):
<h:commandButton value="Click Me!" action="#{backing_hellocommandButton_action}"/>
Let s review precisely what happens at runtime with this simple application The enduser makes an initial, non-postback request to view the page hellojsp The Faces controller servlet handles the request by creating a UIViewRoot component and storing it in the FacesContext It then redirects to the helloxhtml JSP page As shown in Figure 7-5, the execution of the Facelets page causes the UIViewRoot to be populated (into a tree) with children components, as well as causing those components to be rendered to the client as they are added to the component tree The user then sees the rendered page with an input field, a button, and an output field with an initial Hello! value The component tree is saved for future requests
TIP In JSF 12 and 20, the execution of the Facelets or JSP page only builds the view This differs
from JSF 10, which built the view and rendered the view as it was being built In JSF 12 and 20, the act of rendering the view happens after the Facelets or JSP page executes This is important the knowledge that the entire tree has been built before rendering enables components to avoid problems such as not being able to access another component in the view because it hasn t yet been added to the view
The end user then enters a text value such as Hello JSF! into the input field and then clicks the Click Me! button, resulting in a postback request being submitted to the JSF application It again enters the initial Create/Restore phase, but this time it restores the tree from before It then updates the server-side InputText1 component with the value Hello JSF! during the Apply Request Value phase Since no validation or conversion is involved
7:
The User Interface Component Model
nor is a Model bean s property updated (since the component was not value bound using its value attribute), we pass on through to the Invoke Application phase In this phase the action method commandButton_action( ) is invoked and the inputText1 component s value is then applied to the outputText1 component s value The subsequent Render Response phase renders the current state of the components back to the user Since no navigation rule was created to handle the success value returned from the action method, the same page is rendered To get even a better feel for working with UI components programmatically, you could add a call to make the input field read-only as the action method executes
outputText1setValue(inputText1getValue()); inputText1setReadonly(true); return "success";
PARTIII PART PART
This will change how the input field renders after the submit and it will no longer be editable
Helpful Advice for Binding UI Components in JSF Views
The first bit of helpful advice to consider when binding UI components in JSF views concerns deciding when and how to use value binding and/or component binding In the previous Hello JSF example we took a slight departure from our earlier examples of always value binding to Model bean properties Recall that JSFReg directly bound the components to the Model UserBean by setting the value attribute of the UI component to #{userBeanfirstName} This is definitely the right approach if you always want to apply the value of a UI component to a certain Model bean property, but in simple cases you can often work with just the UI components themselves without having to always apply their values to Model bean properties When a JSF tag representing a UI component is directly bound to an instance of the same type of UI component in a backing bean, direct component binding is preferable Instead of setting the value attribute as before, the binding attribute is set with the JSF expression of the instance of the UI component in the backing bean The same Hello JSF example showed that value binding to a Model bean property was not needed Instead, it was possible to simply work with the values of the components themselves as opposed to value binding them to a separate Model bean property This is often the case when only working with transient values that do not need to be passed on to the Model
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