vb.net free barcode dll The Building Blocks of ADF Faces in Java

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The Building Blocks of ADF Faces
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Although your first exposure to ADF Faces will probably be the catalog of UI components, ADF Faces has more to it than that. Let s briefly look at the main building blocks of ADF Faces.
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Introduction to ADF Faces Rich Client
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UI Components
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ADF Faces includes a palette of over 150 UI components ranging from basic buttons and input fields to highly interactive graphs and maps. Each UI component has properties, such as background color, and can have behavior as well; for example, a button can be clicked to initiate an action.
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Managed Beans and Backing Beans
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While your business logic code is encapsulated inside the business service, you may want to write UI-specific code related to a particular web page. Managed beans are simply Java classes that are managed for you by JSF and where you can write UI-specific code. For example, on clicking a button, you might want to hide some components on the page. In this case you would use a managed bean to contain the code for implementing this UI behavior. Backing beans is simply a naming convention for managed beans that are specifically associated with a UI page. While you are still learning, you ll probably have only limited need to use them, but it s good to know they are there and what they are for.
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Later in this chapter when you create your first page, you might notice that some of the UI components contain a strange syntactical text. This is a feature of JSF called Expression Language (EL). EL is simply a notation that allows the UI component to refer to a Java bean associated with the application. Primarily, you ll see EL used to hook up the UI components to the framework Java class that implements the binding to the business service. So, for example, an input field might have its Value property set to #{foo.firstName}. EL will look up a managed bean called foo and then call getFirstName() in that managed bean.
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Navigation Cases
For any application that is more than just a single page, you will need to define the flow of the pages. JSF provides a feature to allow the flow of the application to be defined separately from the application pages, rather than hard-coding links or page references inside a page. The JSF page flow can be defined in a file called faces-config.xml. However, Oracle ADF extends the default JSF controller with the ADF Controller that adds functionality above and beyond the standard JSF page flow, including allowing page flow to be defined in any number of files. This means that the flow of the application can be broken down into different subflows that can be worked on in isolation and reused as required. The default ADF Controller page flow file is adfc-config.xml.
Life Cycle
Requesting a page or performing an action on a page requires a number of steps to be executed. This series of steps is collectively called the life cycle. For the most part, the various steps are not something you need to know in any depth at this stage in your learning. However, it is good to know that there are a number of steps involved in the request and response of an ADF Faces page, and as you become more experienced you can add your own custom code to augment the behavior of these steps.
Overview of ADF Faces Components
Throughout this book, and as you start to get more hands-on with JDeveloper, you will become more and more familiar with the full range of components, what they can do, and how they are
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best used. Many of the components will be created automatically for you as you drag and drop the business service onto pages. However, as a way of an introduction to the components, here are some of the more frequently used components with which you will become familiar.
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