Book Image

PrimeFaces Beginner's Guide

By : Siva Prasad Reddy Katamreddy
Book Image

PrimeFaces Beginner's Guide

By: Siva Prasad Reddy Katamreddy

Overview of this book

PrimeFaces is a lightweight UI component framework for JSF based applications. PrimeFaces is very easy to use because it comes as a single JAR file and requires no mandatory XML configuration. It provides more than 100 UI Components and an in-built AJAX support. It also provides theme support for UI components with more than 30 themes out-of-the-box. With PrimeFaces, developers can create rich user interfaces very easily.PrimeFaces Beginners Guide is a practical, hands-on guide that provides you with clear step-by-step exercises,that will help you to learn and explore the features of PrimeFaces.PrimeFaces Beginners Guide starts by showing you how to install PrimeFaces, create sample forms, and perform validations and then looks at various commonly used PrimeFaces utility components. Next, you will look into various basic text input components like form controls, Calendar, AutoComplete, and Rich Text Editor. Then you will learn about advanced UI components such as DataTables, panels, menus,and charts. Throughout the chapters we will be building a sample web application using PrimeFaces progressively that will give you a hands-on experience on using PrimeFaces effectively.You will learn how to create complex layouts using accordion panels, tab views, sophisticated menu navigations, breadcrumbs and much more. You will also learn how to display data using DataTable with pagination, filters, and lazy loading, and how to export data to Excel or PDF features. You will learn how to represent data in various formats like trees, charts, and TagCloud. You will also learn how to build an application supporting multiple themes.With this PrimeFaces Beginner's Guide , you will learn how to use PrimeFaces easily and effectively.
Table of Contents (20 chapters)
PrimeFaces Beginner's Guide
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
3
Using PrimeFaces Common Utility Components
Index

Time for action – manually start and stop polling


We will now demonstrate how to start and stop polling using external triggers such as start and stop buttons using following steps:

  1. Create a form with a poll component and start/stop buttons to start and stop polling using following code:

    <h:form>
      <p:outputLabel value="Current Time:" /> <p:outputLabel id="currentTime" value="#{serverTimeBean.time}"/>
      <p:poll interval="1"  listener="#{serverTimeBean.updateTime()}" update="currentTime" widgetVar="currentTimePoller" autoStart="false"/> <br/>
      <p:button value="Start" onclick="currentTimePoller.start()" href="#" />
      <p:button value="Stop" onclick="currentTimePoller.stop()" href="#"/><br/>
    </h:form>

What just happened?

We have set the autoStart attribute to false, so that polling does not start automatically on page load. We have given a name for the poll component using widgetVar ="currentTimePoller" so that we can invoke start() and stop() methods on the poll component. We have associated the start() and stop() methods to the button's onclick events. So when we click on the Start button, polling will start and when we click on the Stop button, polling will be stopped.

Tip

PrimeFaces provides PrimeFaces push, which is better suitable for asynchronous processing. Prefer using PrimeFaces push over <p:poll> component. For more information see http://www.primefaces.org/showcase/push/index.jsf.