Struts 2 <s:checkbox> checkbox example

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Download It – Struts2-CheckBox-Example.zip

In Struts 2 , you can use the <s:checkbox> tag to create a HTML check box. ThefieldValue=”true” is the actual value that will be submitted by the check box.

<s:checkbox name="checkMe" fieldValue="true" label="Check Me for testing"/>

In common, you do not need to declared the fieldValue=”true”, because true is the default value.

It will generate the following HTML.

<input type="checkbox" name="checkMe" value="true" id="xx_checkMe"/><input type="hidden" id="__checkbox_xx_checkMe" name="__checkbox_checkMe" value="true"/><label for="resultAction_checkMe" class="checkboxLabel">Check Me for testing</label>

Preselect a checkbox

If you want to preselect a check box, just add a value attribute and set it to true.

<s:checkbox name="checkMe" fieldValue="true" value="true" label="Check Me for testing"/>

It will generate the following HTML.

<input type="checkbox" name="checkMe" value="true" checked="checked" id="xx_checkMe"/><input type="hidden" id="__checkbox_xx_checkMe" name="__checkbox_checkMe" value="true" /><label for="resultAction_checkMe" class="checkboxLabel">Check Me for testing</label>

Struts 2 <s:checkbox> example

A full example to create a check box via Struts 2 <s:checkbox>, and assign submitted check box value to the Action class and display it.

1. Action

Action class with a checkMe boolean property to hold the check box value.
CheckBoxAction.java

package com.mkyong.common.action; import com.opensymphony.xwork2.ActionSupport; public class CheckBoxAction extends ActionSupport{ private boolean checkMe; public boolean isCheckMe() {return checkMe;} public void setCheckMe(boolean checkMe) {this.checkMe = checkMe;} public String execute() { return SUCCESS; } public String display() { return NONE; } }

2. Result page

Result page to use Struts 2 “s:checkbox” tag to create a check box.

checkBox.jsp

<%@ taglib prefix="s" uri="/struts-tags" %><html><head></head> <body><h1>Struts 2 check box example</h1> <s:form action="resultAction" namespace="/"> <h4><s:checkbox name="checkMe" fieldValue="true" label="Check Me for testing"/></h4>  <s:submit value="submit" name="submit" /> </s:form> </body></html>

result.jsp

<%@ taglib prefix="s" uri="/struts-tags" %><html> <body><h1>Struts 2 check box example</h1> <h4>  CheckBox (CheckMe) value : <s:property value="checkMe"/></h4>  </body></html>

3. struts.xml

Link all together ~

<?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.devMode" value="true" /> <package name="default" namespace="/" extends="struts-default">    <action name="checkBoxAction"          class="com.mkyong.common.action.CheckBoxAction" method="display"><result name="none">pages/checkBox.jsp</result>   </action>    <action name="resultAction" class="com.mkyong.common.action.CheckBoxAction"><result name="success">pages/result.jsp</result>   </action>  </package> </struts>

5. Demo

http://localhost:8080/Struts2Example/checkBoxAction.action

http://localhost:8080/Struts2Example/resultAction.action

Reference

Struts 2 checkbox documentation

转自:http://www.mkyong.com/struts2/struts-2-scheckbox-checkbox-example/