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Mastering JavaServer Faces 2.2

You're reading from   Mastering JavaServer Faces 2.2 Master the art of implementing user interfaces with JSF 2.2

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Product type Paperback
Published in Jun 2014
Publisher
ISBN-13 9781782176466
Length 578 pages
Edition 1st Edition
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Author (1):
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Anghel Leonard Anghel Leonard
Author Profile Icon Anghel Leonard
Anghel Leonard
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Table of Contents (15) Chapters Close

Preface 1. Dynamic Access to JSF Application Data through Expression Language (EL 3.0) FREE CHAPTER 2. Communication in JSF 3. JSF Scopes – Lifespan and Use in Managed Beans Communication 4. JSF Configurations Using XML Files and Annotations – Part 1 5. JSF Configurations Using XML Files and Annotations – Part 2 6. Working with Tabular Data 7. JSF and AJAX 8. JSF 2.2 – HTML5 and Upload 9. JSF State Management 10. JSF Custom Components 11. JSF 2.2 Resource Library Contracts – Themes 12. Facelets Templating A. The JSF Life Cycle
Index

Queue control for AJAX requests


Queuing AJAX requests on the client side is a common practice meant to ensure that only one request is processed at a time. The goal of this approach is to protect the server from being overwhelmed and the client browser from blocking or receiving AJAX responses in an undefined order. While AJAX queuing is available in JSF 2.0, queue control for AJAX is available starting with JSF 2.2.

In order to provide AJAX queue control, JSF 2.2 introduced an attribute named delay for the <f:ajax> tag. The value of this attribute is a string that represents a number of milliseconds (defaults to none). During this time interval, only the most recent request is actually sent to the server, while the rest of them are ignored. In other words, JSF will wait n milliseconds until the most recent AJAX request is executed. By default, it will not wait.

Here is an example of using the default delay attribute, and an explicit delay of 1000 milliseconds. In order to point out...

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