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JSF 12 TIP For JSF 12, action components implement the ActionSource2 interface instead of
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ActionSource ActionSource2 extends from JSF 11 s ActionSource and allows for usage of 12 s new Unified EL Details on 12 s Unified EL is provided in 5
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For example, a button (UICommand or any component that implements ActionSource) doesn t get updated with a new value during form submission; it just needs to record whether or not it was clicked on If clicked, this results in an event, called an action event (ActionEvent), being queued Later you ll see exactly what an action event is and how it allows for execution of custom code that corresponds to a button or link click
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JSF 20 TIP JSF 20 introduced a new class of events, called System Events, that will be covered
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in 9 Briefly, System Events provide a very precise way to observe the state of the JSF lifecycle and are used by JSF to enable many of the new features in JSF 20, such as Ajax and enhanced state saving
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Part I:
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Although the request processing lifecycle processes the different phases in a consistent manner, the execution order of the phases can be altered for special cases For example, you may want to add a Cancel button to a form When clicked, it will skip all validation and simply navigate to another page without processing the values in a form To alter the processing order of the request processing lifecycle, simply set the immediate attribute on a component As described later in this chapter, setting the immediate attribute causes a different effect on different components
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Process Validations
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Once the Apply Request Values phase is completed, the Process Validations phase, where conversion and validation of the incoming data occurs, is performed (Data type conversion and validation is explained in detail in 8) The JSF runtime initiates this phase by calling a master processValidators( ) method (on the UIViewRoot instance), which is similar to the processDecodes( ) method in that it recursively propagates down the component tree calling each component s processValidators( ) method When each component s processValidators( ) method is called, any converter or validator associated with the component will be invoked
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NOTE Data type conversion actually occurs before validation but is still initiated in the same
Process Validations phase This is needed because in order to perform a validation, the data must first be converted to its server-side data type
As you saw in the JSFReg example in 2, UI components can have validators and converters associated with them in several ways In the example, a validation requirement was associated with some of the components either by setting an attribute of the component itself (such as setting the required attribute to true for an inputText component) or by registering custom validation code (such as when the e-mail validation method was attached to the component by setting its validator attribute) The example in 2 also had a converter associated with the date of birth (dob) inputText (UIInput) component by inserting a convertDateTime converter tag as a child of the input component Any component failing validation (or conversion) will have its valid property set to false and a FacesMessage will be queued onto the FacesContext as shown in Figure 3-5 Later, when the response is rendered back to the user (in the Render Response phase), the messages can be displayed using the Faces Message or Messages component so the user can correct and re-submit
Update Model Values
Assuming the incoming data has passed validation and conversion, it is now time for the data to be promoted and assigned to any Model objects that have been value bound to the UI component Again, recall the example in 2 In it, we created a Java class, UserBean, which was registered as a managed bean, and bound its properties to the different UI components on the page using JSF Expression Language It is during the Update Model Values phase that the actual managed bean or Model object s properties are updated with the new values of the UI components to which they were bound The actual mechanism behind this is similar to the other phases A master processUpdates( ) method is called on the UIViewRoot instance, which initiates a cascading set of processUpdates( ) method calls The UIInput class overrides the processUpdates( )
3:
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