The elseIf tag is used for decision making on the basis of condition specified in the If tag. elseIf tag always used with If tags. If the condition in the <s:if> tag is not satisfied or evaluate false then elseIf tag is execute and evalute the condition defined in the <s:elseIf > tag and then the evalution of the elseIf or Else tag place. if <s:if> tag evaluate false then the ElseIf tag is evaluated.if the <s:elseIf > tag is evaluate true then ElseIf executed othervise Else is executed.
The following Example will shows how to implement the ElseIf tag in the Struts2 --
First we create a JSP file named IfControlTag.jsp as follows.
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<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE
html PUBLIC "-//W3C//DTD
HTML 4.01 Transitional//EN" <%@taglib prefix="s" uri="/struts-tags"%> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> </head> <body> <s:set name="Name" value="%{'Gyan'}" />
<s:if test="%{#Name=='S'}">You Working with-- <div><s:property value="%{#Name}" /></div> <div>Your Name is Gyan</div> </s:if>Evaluation of elseif condition <s:elseif test="%{#Name=='Gyan'}">You Working with-- <div><s:property value="%{#Name}" /></div> <div>My Name is Gyan</div> </s:elseif> <s:else>Evaluation of else condition <div>Your Name is Not Specified</div> </s:else> </body> </html> |
The index.jsp file is as follows- This file only contains the hiperlink only.
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<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <%@taglib prefix="s" uri="/struts-tags"%> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>If Control Tag</title> </head> <body> <ul> <li><a href="IfControlTag.jsp">IF Control Tag Example</a></li> </ul> </body> </html> |
The Struts mapping file Struts.xml is as follows-
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<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"> <struts> <constant name="struts.enable.DynamicMethodInvocation" value="false" /> <constant name="struts.devMode" value="false" /> <constant name="struts.custom.i18n.resources" value="ApplicationResources" /> <package name="gyan" extends="struts-default" namespace="/"> <action name="Result" class="gyan.Result" > <result name="SUCCESS">/IfControlTag.jsp</result> </action> </package> </struts> |
The web config file web.xml is as follows-
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<?xml version="1.0" encoding="UTF-8"?> <web-app
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance <display-name>IfTagExample</display-name> <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>/index.jsp</welcome-file> </welcome-file-list> </web-app> |
The action class Result.java is as follows.
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package gyan; import com.opensymphony.xwork2.ActionSupport; public class Result extends ActionSupport{ public String execute() throws Exception { return SUCCESS; } } |
This Program produces output on the basis of the <s:if> tag evaluation, This evaluate false and then elseif is evaluated and give the output as.
Output:-
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