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FIGURE 15-1. Partial page rendering on a binding executable
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NOTE You would still have to use AutoSubmit if you want to force the business service to be updated immediately on data being changed in the UI. However, any business service attribute that changes as a result of that submit would automatically be refreshed, since PPR is set on the binding executable.
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Managed and Backing Beans
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For the most part, the nuts and bolts of your application code will exist within the business services layer. This means that in the majority of cases, and certainly in these early stages of your learning, you will probably never need to create, or write code in, a managed bean. However, that doesn t mean that there won t be situations that require you to write code to address a specific UI requirement. Therefore, managed beans are covered here to show their basic principles and how they are created.
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You might see the terms managed beans and backing beans used interchangeably. They are, in fact, one and the same thing: simply a Java class in which UI-specific methods can be written. Strictly speaking, there are only managed beans. The reason for the two terms is that if a managed bean has a one-to-one mapping with a page and includes methods to access the UI components on that page, then you can think of that managed bean as backing that page hence, a backing bean.
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The Basics of Managed Beans
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So what are managed beans Managed beans provide a mechanism to register a Java class in which UI-specific code can be placed. The methods in the class can then be referenced, using Expression Language (EL), from the various trigger points or properties of UI components. These trigger points, called component listeners, might relate to an action, such as when a button is clicked or the value in a field is changed. The configuration details for managed beans are generally registered in the default unbounded task flow file, adfc-config.xml, but can also be registered in any other task flow if required. When a managed bean method is called by a UI component, the framework is responsible for instantiating an instance of the bean, which remains in memory for a specific period of the processing life cycle as defined by its scope.
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Advanced UI Techniques
Creating a Managed Bean
As you might expect, there are a number of different ways you can create managed beans. One option is to create the managed bean through the Overview tab of the task flow editor. This is also the place where you can edit and fine-tune the details of the managed bean.
You can also create managed beans directly from the Property Inspector for a UI component.
Component Listeners
As well as having visual properties such as color, font, and label, ADF Faces UI components also have a built-in feature to listen for a particular event and then initiate some code when that event happens. You have already come across one of these component listeners in 14, where you found that a button has an ActionListener property, which listens for the button being clicked. Similarly, an Input Text component has a ValueChangeListener property that will be triggered when the data in the field is changed. So, let s look at an example of where you could use a component listener to call a managed bean method.
Assigning a Managed Bean Method to a Component Listener
Consider the case in which the creation of a new employee should automatically disable the Commission field if the employee is not a salesman. The first step is to go to the ValueChangeListener property for the Job field. This property defines the method that should be called when the value within the field changes.
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Click the down-arrow icon to the right of ValueChangeListener and select Edit to launch the Edit Property dialog. Either select an existing managed bean and method or create a new one.
JDeveloper will create the Java class for the managed bean and register that information in the appropriate configuration file. It will also create a placeholder method within the Java class and reference that method from the UI component. So, you should now see that the ValueChangeListener property is set to #{editEmp.salesman_valueChanged}, meaning that when a value is changed in this field, this method will automatically be executed.
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