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Quick Start Guide to Oracle Fusion Development
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NOTe It is not only UI components that can reference bindings; you can also reference the bindings from code. 19 explains how you can programmatically access the UI component binding in order to access or change a value.
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For the most part you can expect JDeveloper to do the right thing with respect to creating the right kind of binding for the right UI component. However, it is useful to be aware of the different flavors of binding. Some of the more common binding types are noted here: Attribute binding Used to bind to a single attribute value such as DepartmentId, typically using a component like an input text or output text field. Tree binding Used to bind collections of data, such as Departments, using components like a tree control or a table. Action binding Used for binding the default actions of an ADF Business Components service such as Create, Delete, Next, and Previous. This would typically be bound to a push button or a link. Method binding Used to bind to any business service function implemented as a Java method such as an application module method or a Java class method. This would typically be bound to a push button or a link. List binding Used to bind data lists, such as a choice list or combo box. ListofValues binding Used to bind data to a list of values component. This component typically involves a pop-up dialog with search capabilities.
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So far you are relying on JDeveloper to create the right bindings for you when you drag and drop from the Data Controls panel onto a JSF page. But what if you want to explicitly create a binding The first question you might ask is, Why would I want to create my own binding if JDeveloper is supposed to do everything for me And that s a good question; however, you will start to find more and more cases where you will want to create your own binding. For example, you might want to reference a binding but not actually display the data in a UI component. Or you might be viewing a table of data and wish to have an attribute of the currently selected record displayed as the title of a tabbed panel. The table requires a tree binding since it is a collection of data; however, the title for the tabbed panel requires only a single value. In this case, it would make sense to create an attribute binding to the same data control as the table is using. The first thing you need to do is to create a new page to display a table of customers. Create a new JSF page and drop on a Panel Tabbed component and inside the Panel Tabbed component drop a Panel Collection. Inside the Panel Collection, drag and drop the customers data collection from the Data Controls panel as a read-only table, as shown in Figure 11-3. You can choose which attributes you want to display. JDeveloper will automatically create the table UI component and the appropriate binding to the data control. You can view the bindings for this page by selecting the Bindings tab, as indicated in Figure 11-3. This page shows the bindings and the data control to which it is bound, as shown in Figure 11-4. The icon for the binding shows that this is a tree binding; however, placing the cursor over the binding will also display a hint that this is a tree binding.
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Show bindings for the page
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FIGure 11-3. Adding a table of customers to a page
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You will also notice that there is a middle column, Executables. For the moment you can assume one executable per collection. This executable is an iterator, or pointer to the current data object. So, in Figure 11-4 you have a tree binding CustomersView1; the pointer for that collection of data is called CustomersView1Iterator; and that references the CustomersView1 data control.
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