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The JavaServer Faces Framework
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To accomplish goals 1 through 3, JavaServer Faces provides a component-centric API from which Web application user interfaces can easily be assembled The JSF specification defines a set of base user interface components (referred to in the JSF specification as UI components) that can be used as is, or extended to achieve more specialized behaviors It s important to note that the term UI component is sometimes used, albeit slightly incorrectly, to actually mean the combination of three independent elements that make up a usable JSF component in a page These are 1 The actual UIComponent class, which defines the behavior of the component, such as UISelectOne, which allows the user to select one from many 2 An optional Renderer class, which provides specific renderings of the component For example, a UISelectOne component could be rendered in HTML as either a group of radio buttons or a select menu 3 A JSP tag, which associates a Renderer with a UIComponent and makes them usable in a JSP as a single tag, <h:selectOneMenu > It s also important to note that pluggable Renderer classes allow the UI component to not only be HTML tagindependent (radio or select), but client device independent where the UI component can be rendered in any markup language, such as HTML, WML, and so on We ll cover the entire Faces UI component model in much greater detail in 6, but for now it is important to understand the key concepts of UI components The initial or standard UI components provided in the specification are accompanied with a set of Core and HTML JSP tag libraries The Core component tag library enables common Web application operations such as assigning validations, converting input values, and loading resource bundles The HTML component tag library creates and renders HTML components These include components for displaying simple text labels, input fields, links and buttons as well as more complex container components for displaying tabular data or panels of child components To accomplish goal 4, which is to provide an event-based, JavaBean model way of interacting with application data, JavaServer Faces provides an easy-to-use mechanism by which Web-accessible user interface components are bound to server-side JavaBeans that are registered as Managed Beans in an XML file (faces-configxml) Beans are bound to a user interface with a simple-to-use Expression Language, which is almost identical to JSTL s Expression Language syntax Once bound, updating bean properties or invoking bean methods from a Web interface is handled automatically by the JSF request processing lifecycle
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JSF 12 TIP JSF Version 12 will have a Unified Expression Language syntax with JSP 21 and
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JSTL This is detailed in 4 The JSF request processing lifecycle also accomplishes goal 5 for handling input validation In addition to providing a means to update server-side application data, the JSF request processing lifecycle and event model allows for the validation and/or data type conversion of data depending on certain events in the application, such as when a form is submitted or when UI components are accessed or manipulated JSF provides built-in validation capabilities as well as the option to create custom validation For data type conversion, such as when a date needs to be converted from a String data type supplied
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An Introduction to JavaServer Faces
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by an HTML input field to a Date type on the server, JSF has a set of pre-built converters that can convert String values to various data types Both JSF validators and converters can be extended and customized in many ways In 7 we ll step through how to use the built-in validators and converters as well as review the different ways of building custom validation and conversion JSF accomplishes goal 6, which is to allow for easy internationalization, by providing a simple way to handle multilingual message bundles and locales Once a message bundle has been configured for a pre-defined set of supported locales, the JSF UI components can then automatically render themselves in the appropriate language based on the incoming request s locale setting In 14 we ll review all the steps required for internationalizing a JSF application The seventh and eighth goals of the original JSF specification request, which is to have the ability to automatically generate the appropriate output (including output supporting accessibility) depending on the target client, is achieved by the JSF API s extremely flexible, pluggable rendering technology This makes it possible to associate multiple renderers with a single UI component and have the appropriate renderer respond with the appropriate markup for the client For example, it is possible to create a JSF UI component that can render itself in HTML when a browser makes a request or WML when a PDA or another WAP-enabled browser makes a request
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