Receiving an Ajax Response - The Java EE 6 Tutorial (original) (raw)
2. Using the Tutorial Examples
3. Getting Started with Web Applications
4. JavaServer Faces Technology
7. Using JavaServer Faces Technology in Web Pages
8. Using Converters, Listeners, and Validators
9. Developing with JavaServer Faces Technology
10. JavaServer Faces Technology: Advanced Concepts
11. Using Ajax with JavaServer Faces Technology
Using Ajax Functionality with JavaServer Faces Technology
Monitoring Events on the Client
Loading JavaScript as a Resource
Using JavaScript API in a Facelets Application
Using the @ResourceDependency Annotation in a Bean Class
The ajaxguessnumber Example Application
The ajaxguessnumber Source Files
The ajaxgreeting.xhtml Facelets Page
The UserNumberBean Managed Bean
Running the ajaxguessnumber Example
To Build, Package, and Deploy the ajaxguessnumber Example Using NetBeans IDE
To Build, Package, and Deploy the ajaxguessnumber Example Using Ant
To Run the ajaxguessnumber Example
Further Information about Ajax in JavaServer Faces Technology
12. Composite Components: Advanced Topics and Example
13. Creating Custom UI Components and Other Custom Objects
14. Configuring JavaServer Faces Applications
16. Uploading Files with Java Servlet Technology
17. Internationalizing and Localizing Web Applications
18. Introduction to Web Services
19. Building Web Services with JAX-WS
20. Building RESTful Web Services with JAX-RS
21. JAX-RS: Advanced Topics and Example
23. Getting Started with Enterprise Beans
24. Running the Enterprise Bean Examples
25. A Message-Driven Bean Example
26. Using the Embedded Enterprise Bean Container
27. Using Asynchronous Method Invocation in Session Beans
Part V Contexts and Dependency Injection for the Java EE Platform
28. Introduction to Contexts and Dependency Injection for the Java EE Platform
29. Running the Basic Contexts and Dependency Injection Examples
30. Contexts and Dependency Injection for the Java EE Platform: Advanced Topics
31. Running the Advanced Contexts and Dependency Injection Examples
32. Introduction to the Java Persistence API
33. Running the Persistence Examples
34. The Java Persistence Query Language
35. Using the Criteria API to Create Queries
36. Creating and Using String-Based Criteria Queries
37. Controlling Concurrent Access to Entity Data with Locking
38. Using a Second-Level Cache with Java Persistence API Applications
39. Introduction to Security in the Java EE Platform
40. Getting Started Securing Web Applications
41. Getting Started Securing Enterprise Applications
42. Java EE Security: Advanced Topics
Part VIII Java EE Supporting Technologies
43. Introduction to Java EE Supporting Technologies
45. Resources and Resource Adapters
46. The Resource Adapter Example
47. Java Message Service Concepts
48. Java Message Service Examples
49. Bean Validation: Advanced Topics
50. Using Java EE Interceptors
51. Duke's Bookstore Case Study Example
52. Duke's Tutoring Case Study Example
53. Duke's Forest Case Study Example
After the application sends an Ajax request, it is processed on the server side, and a response is sent back to the client. As described earlier, Ajax allows for partial updating of web pages. To enable such partial updating, JavaServer Faces technology allows for partial processing of the view. The handling of the response is defined by the render attribute of the f:ajax tag.
Similar to the execute attribute, the render attribute defines which sections of the page will be updated. The value of a render attribute can be one or more component id values, one of the keywords @this, @all, @none, and @form, or an EL expression. In the following example, the render attribute simply identifies an output component to be displayed when the Ajax action has successfully completed.
<h:commandButton id="submit" value="Submit"> <f:ajax execute="userNo" render="result" /> <h:outputText id="result" value="#{userNumberBean.response}" />
However, more often than not, the render attribute is likely to be associated with an event attribute. In the following example, an output component is displayed when the button component is clicked.
<h:commandButton id="submit" value="Submit"> <f:ajax event="click" execute="userNo" render="result"/> <h:outputText id="result" value="#{userNumberBean.response}"/>
Note - Behind the scenes, once again the jsf.ajax.request() method handles the response. It registers a response-handling callback when the original request is created. When the response is sent back to the client, the callback is invoked. This callback automatically updates the client-side DOM to reflect the rendered response.
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