Merge pull request #478 from k0l0ssus/master

JSF Page to demo EL intro
2016-07-06 11:48:21 +02:00 · 2016-07-06 11:48:21 +02:00 · e3b1d3a8dc
parent 10b5780576 8a19546b1a
commit e3b1d3a8dc
2 changed files with 156 additions and 0 deletions
--- a/jsf/src/main/java/com/baeldung/springintegration/ELSampleBean.java
+++ b/jsf/src/main/java/com/baeldung/springintegration/ELSampleBean.java
@ -0,0 +1,118 @@
+/*
+ * To change this template, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package com.baeldung.el.controllers;
+
+import java.util.Random;
+import javax.annotation.PostConstruct;
+import javax.faces.application.Application;
+import javax.faces.application.FacesMessage;
+import javax.faces.bean.ManagedBean;
+import javax.faces.bean.ViewScoped;
+import javax.faces.component.html.HtmlInputText;
+import javax.faces.context.FacesContext;
+
+/**
+ *
+ * @author Tayo
+ */
+@ManagedBean(name = "ELBean")
+@ViewScoped
+public class ELSampleBean {
+
+    private String firstName;
+    private String lastName;
+    private String pageDescription = "This page demos JSF EL Basics";
+    private int pageCounter;
+    private Random randomIntGen = new Random();
+
+    @PostConstruct
+    public void init() {
+        pageCounter = randomIntGen.nextInt();
+    }
+    
+    public void save(){
+        
+    }
+
+    public void saveFirstName(String firstName) {
+       this.firstName = firstName;
+    }
+    
+      
+    public void saveByELEvaluation(){
+        firstName = (String)evaluateEL("#{firstName.value}", String.class);
+        FacesContext ctx = FacesContext.getCurrentInstance();
+        FacesMessage theMessage = new FacesMessage("Name component Evaluated: "+firstName);
+        theMessage.setSeverity(FacesMessage.SEVERITY_INFO);
+        ctx.addMessage(null,theMessage);
+       
+    }
+
+    private Object evaluateEL(String elExpression, Class<?> clazz) {
+        Object toReturn = null;
+        FacesContext ctx = FacesContext.getCurrentInstance();
+        Application app = ctx.getApplication();
+        toReturn = app.evaluateExpressionGet(ctx, elExpression, clazz);
+        
+        return toReturn;
+
+    }
+
+    /**
+     * @return the firstName
+     */
+    public String getFirstName() {
+        return firstName;
+    }
+
+    /**
+     * @param firstName the firstName to set
+     */
+    public void setFirstName(String firstName) {
+        this.firstName = firstName;
+    }
+
+    /**
+     * @return the lastName
+     */
+    public String getLastName() {
+        return lastName;
+    }
+
+    /**
+     * @param lastName the lastName to set
+     */
+    public void setLastName(String lastName) {
+        this.lastName = lastName;
+    }
+
+    /**
+     * @return the pageDescription
+     */
+    public String getPageDescription() {
+        return pageDescription;
+    }
+
+    /**
+     * @param pageDescription the pageDescription to set
+     */
+    public void setPageDescription(String pageDescription) {
+        this.pageDescription = pageDescription;
+    }
+
+    /**
+     * @return the pageCounter
+     */
+    public int getPageCounter() {
+        return pageCounter;
+    }
+
+    /**
+     * @param pageCounter the pageCounter to set
+     */
+    public void setPageCounter(int pageCounter) {
+        this.pageCounter = pageCounter;
+    }
+}
--- a/jsf/src/main/webapp/el_intro.xhtml
+++ b/jsf/src/main/webapp/el_intro.xhtml
@ -0,0 +1,38 @@
+<?xml version='1.0' encoding='UTF-8' ?>
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml"
+      xmlns:h="http://java.sun.com/jsf/html"
+      xmlns:f="http://java.sun.com/jsf/core">
+    <h:head>
+        <title>Baeldung | The EL Intro</title>
+
+    </h:head>
+
+    <h:body>
+        <h:form id="elForm">
+
+            
+                <h:messages />
+                <h:panelGrid columns="2">
+                    <h:outputText value="First Name"/>
+                    <h:inputText id="firstName" binding="#{firstName}" required="true" value="#{ELBean.firstName}"/>
+                    <h:outputText value="Last Name"/>
+                    <h:inputText id="lastName" required="true" value="#{ELBean.lastName}"/>
+                    <h:outputText value="Save by value binding"/>
+                    <h:commandButton  value="Save"  action="#{ELBean.save}">
+                       
+                    </h:commandButton>
+                    <h:outputText value="Evaluate backing bean EL"/>
+                    <h:commandButton  value="Save" action="#{ELBean.saveByELEvaluation}">
+                          
+                    </h:commandButton>
+                    <h:outputText value="Save by passing value to method"/>
+                    <h:commandButton  value="Save" action="#{ELBean.saveFirstName(firstName.value.toString().concat('(passed)'))}"/>
+                    <h:outputText value="JavaScript (click after saving First Name)"/>
+                    <h:button  value="Alert" onclick="alert('Hello #{ELBean.firstName}')"/>
+                </h:panelGrid>
+            
+        </h:form>
+    </h:body>
+</html>
+