vb.net free barcode dll Exposing UI Components in the Managed Bean in Java

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Exposing UI Components in the Managed Bean
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If you look at the managed bean class you created, you will see the method that will be called when the value changes in the job field:
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public void salesman_valueChanged(ValueChangeEvent valueChangeEvent) { // Add event code here... }
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It is in here that you will write your code to disable the Commission field depending on the value in the Job field. But how do you access the commission field from this code How can you programmatically set the field to be enabled or disabled You can do this by asking JDeveloper to expose methods to access the UI components in the managed bean. A good rule to remember here is to only expose the UI components in the managed bean that you actually need. You can do this on a case-by-case basis using the Binding property for each UI component. This allows you to define the managed bean in which the component should be exposed. If you do this for the Commission field, you will see methods in the managed bean class that allow you to access the component. You can now modify the method to be
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public void salesman_valueChanged(ValueChangeEvent valueChangeEvent) { // Add event code here... getCommission().setDisabled(true); if (valueChangeEvent.getNewValue().equals("SA_REP")) { getCommission().setDisabled(false); } }
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This means that when a value is changed in the Job field, this method will fire and will only enable the Commission field for a sales rep. TIP Managed beans that include component references like this should have Scope set to request or backingBean.
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The final stage is to ensure that when this code is executed, the page knows that it has to refresh the Commission field. As you found out earlier in this chapter, AutoSubmit and PartialTriggers are required to implement this behavior; otherwise, any change to the field would not be visible until the page is submitted. Set AutoSubmit on the Job field and set PartialTriggers on the Commission field to reference the component ID of the Job field. Now when you create a new employee, the Commission field will be disabled for those who are not sales reps.
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NOTE This example serves two purposes. First, it outlines the basic feature of a managed bean and how it can be used for UI-specific code. Second, as noted earlier, it shows that in many cases you can achieve the same result without the need to write code in a managed bean. In this example, by setting the Disabled property on the Commission field to #{bindings.JobId.inputValue!="SA_REP"}, you can achieve the same behavior.
Advanced ADF Faces Components
By now you should have an understanding of some of the more commonly used ADF Faces components such as buttons, input fields, and layout components. However, ADF Faces also includes a range of components that provide more advanced functionality. The good news for you is that, as a new Fusion developer, the experience of adding these more advanced features into your application is pretty much the same as how you add buttons and input fields. These more sophisticated ADF Faces components also exist in the Component Palette and can be dragged and dropped onto the appropriate facet or position on the page and have properties set. Let s take a look at some of these features.
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Pop-ups
You have already seen how a task flow can be displayed in a pop-up window, but there is a more general requirement to have UI information displayed in a separate window. The ADF Faces Popup component is a parent container for UI content that gets displayed in a separate pop-up window.
Creating a Pop-up Dialog
Let s assume you want to create a pop-up dialog in which you can view and edit details about a customer s order. To do this, drag and drop a Popup component from the Component Palette onto the page. You can drop the Popup component anywhere on the page, since it doesn t really matter where the pop-up dialog lives in the hierarchy of the page, but it is generally good practice to position the Popup component near the component that will initiate its launch. On dropping the Popup component onto the page, the visual editor will switch to allow you to edit the Popup component. Note that you can also use the Structure window or, on the visual editor, right-click and select Edit Popup to edit the Popup component. The Popup component is an invisible container. You would, therefore, typically drop a Dialog component as a child of the Popup component. The Dialog component provides a frame, title, and various options for displaying buttons. You can then design the pop-up dialog as you would any other page.
Displaying a Pop-up Dialog Once you have created a pop-up dialog, the next step is to define the action that should display the dialog. Again, ADF Faces provides a component, called Show Popup Behavior, that has a property PopupId to define which pop-up dialog should be displayed. If you drop a Show Popup Behavior component as a child of a button (either a Button or Toolbar Button component), then clicking the button will automatically display the pop-up dialog as referenced by PopupId.
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