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PrimeFaces Beginner's Guide

PrimeFaces Beginner's Guide

By : K. Siva Prasad Reddy
2.5 (4)
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PrimeFaces Beginner's Guide

PrimeFaces Beginner's Guide

2.5 (4)
By: K. Siva Prasad Reddy

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 (15 chapters)
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3
3. Using PrimeFaces Common Utility Components
6
6. Working with Selection Input Components
14
Index

Time for action – validating the user registration form

We can use JSF validations for performing the earlier mentioned validations on the registration form. We can also perform validations using PrimeFaces AJAX-based validations by hooking up with JavaScript events, for this perform the following steps:

  1. Update registrationWithVal.xhtml to build a user registration form along with validation support using the following code:
    <!DOCTYPE html>
    <html xmlns="http://www.w3.org/1999/xhtml"
          xmlns:h="http://java.sun.com/jsf/html"
          xmlns:f="http://java.sun.com/jsf/core"
          xmlns:ui="http://java.sun.com/jsf/facelets"
          xmlns:p="http://primefaces.org/ui">
    
    <h:head>
      <title>Registration</title>
    </h:head>
    <body> 
      <h:form id="registrationForm">
        <p:panel header="Registration Form" style="width: 800px;">
        <p:messages />
        <h:panelGrid columns="3">
          <p:outputLabel value="UserName:*"/>
          <p:inputText id="userName" value="#{userController.registrationUser.userName}"
              required="true" label="UserName" >
            <p:ajax event="keyup"  update="userNameMsg"/>
          </p:inputText>
          <p:message id="userNameMsg" for="userName"/>
          
          <p:outputLabel value="Password:*"/>
          <p:password id="password" value="#{userController.registrationUser.password}"
                required="true" label="Password">
            <f:validateLength minimum="4"/>
            <p:ajax update="passwordMsg" event="keyup"/>
          </p:password>
          <p:message id="passwordMsg" for="password"/>
          
          <p:outputLabel value="FirstName:*"/>
          <p:inputText id="firstName" value="#{userController.registrationUser.firstName}"
                 required="true" label="FirstName">
          
          </p:inputText>
          <p:message id="firstNameMsg" for="firstName"/>
          
          <p:outputLabel value="LastName:"/>
          <p:inputText id="lastName" value="#{userController.registrationUser.lastName}"/>
          <p:message id="lastNameMsg" for="lastName"/>
          
          <p:outputLabel value="Email:"/>
          <p:inputText id="email" value="#{userController.registrationUser.email}"/>
          <p:message id="emailMsg" for="email"/>
          
          <p:outputLabel value=""/>
          <p:commandButton action="#{userController.register}" value="Register" update="registrationForm"/>
          <p:outputLabel value=""/>
          
            
        </h:panelGrid>
        </p:panel>
      </h:form>
    </body>
    </html>
  2. Run the application and point your browser to http://localhost:8080/chapter1/registrationWithVal.jsf. Leave UserName and FirstName blank and enter password with less than four characters and submit the form. Then Registration Form will be redisplayed with errors as shown in the following screenshot:
    Time for action – validating the user registration form

What just happened?

We have used input validations such as required, minimum length, and so on. We have used PrimeFaces AJAX-based validations using <p:ajax> on the keyup JavaScript event. So as you type in the password, it will get validated and update the validation message immediately. You can also use <p:ajax> with other JavaScript events such as keydown, keypress, mouseover, and so on.

Tip

Beware of registering AJAX event listeners for JavaScript events such as keyup, keydown, and so on; as it may increase processing overhead and degrade performance. So use this feature cautiously.

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