vb.net free barcode dll As before, JDeveloper will automatically prompt you for any imports. Ensure that you import in Java

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oracle.binding.AttributeBinding.
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NOTe This example assumes you have written the previously described getBindings() method. Note also that the value passed to getControlBinding() must exactly match the name of the binding or you will get an exception. In the preceding code, an object, AttributeBinding, is used to reference an attribute binding to CustLastName. A call to getInputValue() and setInputValue() can be used to read and write the values referenced by the attribute binding.
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Now that you know how to access an attribute binding, you might want to take the next step and access a method binding. For example, suppose that when a user clicks a particular button,
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you want some code to execute that includes a call to a bound method. This is very similar to the code in the previous example:
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public void buttonPressCallMethod(ActionEvent actionEvent) { // Add event code here... OperationBinding operationBinding = getBindings(). getOperationBinding("Commit"); operationBinding.execute(); }
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NOTe On writing this code, you may be asked to import oracle.binding .OperationBinding. In this example, getOperationBinding() returns the binding for the commit action on which an execute() method can be called. You should, of course, ensure that the binding you are calling exists on the page. NOTe You might be thinking, surely, dragging and dropping the commit operation from the Data Controls panel is doing the same thing And that is correct in this simple case; however, this example shows that you have the flexibility to call a bound method, possibly as the result of more complex programmatic logic.
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Now that you know you can programmatically access the binding layer through the BindingContext object, you may wonder whether you can access other features of the UI framework in the same way. Yes, you can. Features like error messages and partial page rendering (PPR) are implemented by framework objects called FacesContext and AdfFacesContext, and, just like BindingContext, these objects give you programmatic access to the UI framework features you have been building through drag and drop and the setting of properties. FacesContext gives access to the information relating to the rendering of the current page, whereas AdfFacesContext provides access to specific ADF Faces features, like PPR. Let s look at two simple examples where these objects can be programmatically accessed.
programmatic Display of Messages
Consider the following example: You have written in a managed bean some code that will alert the user when an error occurs. This could be an error handled by the application, such as the user not being authorized to access a specific piece of data, or it could be a programmatic error that should, at the very least, alert the user to an unexpected failure.
Accessing FacesContext
To programmatically display an error or warning message, you need to add your message to the FacesContext object, which will then be displayed when the page-processing cycle completes.
19:
Common UI Coding Examples
To demonstrate this in a simple example, add a button to a page, and in a managed bean add the following code:
public void TestMessageButton(ActionEvent actionEvent) { // Add event code here... FacesMessage fm = new FacesMessage("A Programmatic Info Message"); fm.setSeverity(FacesMessage.SEVERITY_INFO); FacesContext context = FacesContext.getCurrentInstance(); context.addMessage(null, fm); }
This code will create a new message, set the message type to an information message, and then add the message to the FacesContext object, where the framework automatically displays it in a pop-up dialog.
Displaying Messages Inline
Expanding on the preceding example, you can also associate the message with a specific UI component. To do this, you need to expose the UI component in the managed bean using the Binding property, as demonstrated in 15. You can then change the button code as follows:
public void TestMessageButton(ActionEvent actionEvent) { // Add event code here... FacesMessage fm = new FacesMessage("A Programmatic Info Message"); fm.setSeverity(FacesMessage.SEVERITY_INFO); FacesContext context = FacesContext.getCurrentInstance(); context.addMessage(getCustLastNameField().getClientId(context), fm); }
NOTe In this example, getCustLastNameField() is the accessor created when setting the Binding property for the UI component. This was covered in 15 if you need a quick reminder.
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