JSF Framework Services or JSF Architecture

JSF Framework Services or JSF Architecture:

• JSF framework is responsible for interacting with client devices. 
• It provides tools for typing together the visual presentation, application logic, and business logic of a web application. 
• However, the scope of JSF is restricted to the presentation tier. 
• Database, Web Services, and other backend connections are outside the scope of JSF. 
• The JSF framework provides the following services…
  
• MVC Architecture
• It includes three terms: Model, View, Controller 
• Model means required data in a particular problem domain.
• Views means web application display. 
• JSF connects the view and the model. 
• Exa: h:inputText value=”#{user.name}”
• The JSF implementation operates as the controller that reacts to the user by processing actions and value change events that update the model or view.
• Exa: h:commandButtonvalue="Login"action="#{user.check}"
• Data Conversion
• Users enter data into web forms as text.
• Business object want data as numbers, dates or other data types. 
• Validation and error handling
• JSF makes it easy to attach validation rules for fields such as “this field is required” or “this field must be number”. 
• When users enter invalid data, you need to display an appropriate error message. 
• Internationalization
• JSF manages internationalization issues such as character encodings and the selection of resource bundles.
• Custom Components
• Component developers can develop sophisticated component that pages designers simply drop into their pages. 
• Exa: Calendar component 
• AJAX Support
• JSF provides a standard AJAX communication channel that transparently invokes server side actions and updates client side components.  
• Alternative renders 
• By default, JSF generates markup for HTML pages. 
• But it is possible to extend the JSF framework to produce markup for another page description languages such as WML.