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Struts Tutorials: Struts2 Tag CheckBoxList
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Using DOJO and Struts2 example : In this example I shall be showing one of the way to create a Tree of treenodes using Struts2 Plugin for Dojo. For this example I am using Struts2 version 2.1.8.1 along with JDK 6 and Tomcat web server 6.0.18 to be very precise. As I have testing this example only with the above software versions, I am not sure how this example will behave in any other versions of Struts 2 Framework. Now coming back to this example, let me touch upon a very brief explanation to the objective I am trying to emphasis. This example is going to create or show a very simple tree structure like as follows, with some interleaved tree nodes.

This example is about statically supplied tree and tree nodes, this means this tree structure is not controlled by any change in application data, instead this tree is just showing the values those are statically defined/supplied at compile time. Later point of time, I shall definitely find some time to re-create this example tree with some dynamically supplied values from some data store. For now let us try to setup the web application deployment environment using Struts2 Framework along with DOJO specific plugin such as for my example I have used following JAR files under /WEB-INF/lib folder:

commons-fileupload-1.2.1.jar

commons-io-1.3.2.jar

commons-logging-1.1.jar

freemarker-2.3.13.jar

ognl-2.6.11.jar

struts2-core-2.1.8.1.jar

struts2-dojo-plugin-2.1.8.1.jar

xwork-core-2.1.6.jar

As I have used web app 2.3 as the web application descriptor setting and the Struts 2 specific prepare and execute filter needs to be set up in web.xml file: So my example web.xml file for your reference as follows:


<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE web-app
  PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
  "http://java.sun.com/dtd/web-app_2_3.dtd">

<web-app>
    <display-name>Struts2 & DOJO example</display-name>
  <filter>
  <filter-name>sample-filter</filter-name>
  <filter-class> 
    org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter
  </filter-class>
  </filter>
  <filter-mapping>
    <filter-name>sample-filter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
</web-app>

As I havn't used any type server side action as such, so this example is pretty much stripped down to only two example specific files such as sample.jsp and the web.xml: sample.jsp for your reference as follows:



<%@ taglib uri="/struts-dojo-tags" prefix="s2d"%>
<html>
<head><title></title>
<s2d:head cache="true"/>
</head>
<body>
<div>
<s2d:tree id="books" label="Books" title="test" >
  <s2d:treenode label="Java" title="test">
    <s2d:treenode id="Thread-Books" label="Multi-threading" />
    <s2d:treenode id="Thread-Books" label="Core-Java" />
    <s2d:treenode id="Thread-Books" label="Networking" />
  </s2d:treenode>
</s2d:tree>
</div>
</body>
</html>

So very important points to remember here is one, the entry for the tag library specific to dojo, two, DOJO head tag should be present inside the HTML head tag. Hope this is quite simple enough to try out, without really spending much time on setting up the software environment to start with.

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