if-elseif-else tag:
The if-elseif-else tag is used for the conditional processing i.e. a block of statements executed based on some conditions.
Syntax:
<s:if test=”%{condition1}”> //block of statements </s:if> <s:elseif test="%{condition2}"> //block of statements </s:elseif> <s:else> //block of statements </s:else> |
Example:
test.jsp
<%@ taglib uri="/struts-tags" prefix="s"%> <html> <head> <title> Struts 2 If, else if and else control tag example </title> </head> <body> <h3> This is a If, else if and else control tag example. </h3> <s:form action="Test"> <s:select label="Select subject" headerKey="-1" headerValue="Select subject" list="#{'java':'java', 'DBMS':'DBMS'}" name="selectedSubject" value="2" /> <s:submit value="submit" align="center"/> </s:form> </body> </html> |
web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <filter> <filter-name>struts2</filter-name> <filter-class> org.apache.struts2.dispatcher.ng. filter.StrutsPrepareAndExecuteFilter </filter-class> </filter> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <welcome-file-list> <welcome-file>test.jsp</welcome-file> </welcome-file-list> </web-app> |
struts.xml
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"> <struts> <package name="default" extends="struts-default"> <action name="Test" class="com.w3spoint.action.Test"> <result name="success">/welcome.jsp</result> </action> </package> </struts> |
Test.java
import com.opensymphony.xwork2.ActionSupport; /** * This class is used as an action class. * @author w3spoint */ public class Test extends ActionSupport{ //data members private String selectedSubject; //business logic public String execute(){ return SUCCESS; } //getter setters public String getSelectedSubject() { return selectedSubject; } public void setSelectedSubject(String selectedSubject) { this.selectedSubject = selectedSubject; } } |
welcome.jsp
<%@ taglib uri="/struts-tags" prefix="s"%> <html> <head> <title> Struts 2 If, else if and else control tag example </title> </head> <body> <h3> This is a If, else if and else control tag example. </h3> <s:set name="subject" value="selectedSubject"/> <s:if test="%{#subject=='java'}"> Java is the selected subject. </s:if> <s:elseif test="%{#subject=='DBMS'}"> DBMS is the selected subject. </s:elseif> <s:else> Unknown Subject. </s:else> </body> </html> |
Output:
Select Subject. 
Click on Submit button. 
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