![]() ![]() The current page is then redisplayed with an error message. When a validation or conversion error occurs, the component whose validation or conversion failed places an associated error message in the queue and invalidates itself. If conversion and validation are successful, then the Update Model phase starts and the converted and validated values are used to update the model. If validation or conversion fails, the lifecycle proceeds to the Render Response phase and a corresponding error message is displayed on the page. If the value requires conversion (for example, if it is displayed as a String type but stored as a DateTime object), the data is converted to the correct type during the Process Validation phase on a per-UI-component basis. Request values are decoded during the JSF Apply Request Values phase and the decoded value is saved locally on the component in the sumbittedValue attribute. When a form with data is submitted, the browser sends a request value to the server for each UI component whose editable value attribute is bound. For more information about displaying messages in an ADF Faces application, see Chapter 17, "Displaying Tips, Messages, and Help."Ħ.2 Conversion, Validation, and the JSF Lifecycle These messages can be displayed in dialogs, or they can be displayed on the page itself next to the component whose conversion or validation failed. If conversion or validation fails, associated error messages are displayed to the user. For validators, the hint is used to convey what values are valid, based on the validation configured for the component. ![]() For converters, the hint usually tells the user the correct format to use for input values, based on the given pattern. Validators and converters have a default hint message that is displayed to users when they click in the associated field. In addition, you can create your own custom validators to suit your business needs. If the required attribute of an input component is set to true you can set one or more validator attributes or you can use the ADF Faces validator components. Many components, such as af:inputDate, automatically provide a conversion capability.ĪDF Faces input components also support validation capabilities. Conversely, data stored as something other than a String type can be converted to a String for display and updating. Then the data is validated against any rules and conditions. When a user edits a date field and submits the form, the string must be converted back to the type that is required by the application. For example, a date field in a form might represent a object as a text string in the format mm/dd/yyyy. When viewed in a client browser, however, the user interface has to present the data in a manner that can be read or modified by the user. A web application can store data of many types, such as int, long, and date in the model layer. 6.1 Introduction to ADF Faces Converters and ValidatorsĪDF Faces input components support conversion capabilities. ![]()
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