 Java & J2EE Page 6 - Introduction to JavaServer Faces Part 2 |
| Java & J2EE Page 6 - Introduction to JavaServer Faces Part 2 |
Authoring the JSP Page for the Validator Example - JavaWe continue with part two of Chapter 2 of Introduction JavaServer Faces Programming, by Budi Kurniawan (McGraw-Hill/Osborne, ISBN 0-07-222983-7, 2004). This section deals with the ActionListener and Component Tree, as well as validation and navigation for your JSP pages. This chapter prepares you for the next chapters by introducing the JSF Application Programming Interface (API) and the Application Configuration file.
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The JSP page is the only component in this application. It is called validatorTest.jsp and is shown in Listing 6. <%@ taglib uri="http://java.sun.com/jsf/html" prefix="h" %><%@ taglib uri="http://java.sun.com/jsf/core" prefix="f" %>The validatorTest.jsp page contains a form with a UIInput component represented by the input_text custom tag. The form also contains a command_button tag representing a UICommand, as well as an output_errors tag for displaying any error that occurs during processing. The most important part is the validate_length tag inside the input_text tag.
Figure 8 The directory structure for the validator example The validate_length tag represents one of the standard validators in JSF. It checks for the length of the input and makes sure that it has a minimum of six characters. Any input shorter than six characters will generate an error that will be displayed by the output_errors tag. To run the application, you need to restart Tomcat. Then, use the following URL to invoke the validatorTest.jsp page: http://localhost:8080/JSFCh02b/faces/validatorTest.jsp
Figure 9 The validator example in action
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Introduction to JavaServer Faces, Part 1
