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Struts2 - Subset Tag (Control Tags)

In this section, we are going to describe the subset tag. The subset tag is a generic tag that takes an iterator and outputs a subset of it. It delegates to org.apache.struts2.util.SubsetIteratorFilter internally to perform the subset functionality.

Add the following code snippet into the struts.xml file.

struts.xml

<action name="subsetTag" class="net.struts2.mergeTag">

<result>/pages/genericTags/subsetTag.jsp</result> 

</action>

Create a list in the action class and populate it with various items as shown in the "subsetTag" class.

subsetTag.java

package net.struts2; 
import com.opensymphony.xwork2.ActionSupport; 
import java.util.*;

public class subsetTag extends ActionSupport { 
   private List myList;

   public String execute() throws Exception{ 
      myList = new ArrayList(); 
      myList.add(new Integer(50)); 
      myList.add(new Integer(20)); 
      myList.add(new Integer(100)); 
      myList.add(new Integer(85)); 
      myList.add(new Integer(500));
      return SUCCESS;
    }

   public List getMyList(){ 
     return myList;
   }
}


Now create a jsp page using and tags as shown in the subsetTag.jsp page. The subset tag takes an iterator and outputs a subset of it.

subsetTag.jsp

<%@ taglib prefix="s" uri="/struts-tags" %>
<html> 
 <head>
   <title>Subset Tag Example!</title> 
 </head>
 <body> 
  <h1><span style="background-color: #FFFFcc">Subset Tag Example!</span></h1> 
   <s:subset source="myList">
    <s:iterator> 
     <s:property /><br>
    </s:iterator> 
   </s:subset>
 </body> 
</html>


Output of Subset Tag:

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