subset

Description

NOTE: JSP-TAG

A 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.

Parameters

Name	Required	Evaluated	Type	Description
Dynamic Attributes Allowed: false

count	false	false	Integer	Indicate the number of entries to be in the resulting subset iterator
decider	false	false	org.apache.struts2.util.SubsetIteratorFilter.Decider	Extension to plug-in a decider to determine if that particular entry is to be included in the resulting subset iterator
id	false	false	String	Deprecated. Use 'var' instead
source	false	false	String	Indicate the source of which the resulting subset iterator is to be derived base on
start	false	false	Integer	Indicate the starting index (eg. first entry is 0) of entries in the source to be available as the first entry in the resulting subset iterator
var	false	false	String	The name to store the resultant iterator into page context, if such name is supplied

Examples

public class MySubsetTagAction extends ActionSupport {
     public String execute() throws Exception {
        l = new ArrayList();
        l.add(new Integer(1));
        l.add(new Integer(2));
        l.add(new Integer(3));
        l.add(new Integer(4));
        l.add(new Integer(5));
        return "done";
     }


     public Integer[] getMyArray() {
        return a;
     }

     public List getMyList() {
        return l;
      }

     public Decider getMyDecider() {
     return new Decider() {
         public boolean decide(Object element) throws Exception {
             int i = ((Integer)element).intValue();
             return (((i % 2) == 0)?true:false);
         }
     };
     }
 }

<!-- s: List basic -->
   <s:subset source="myList">
      <s:iterator>
         <s:property />
      </s:iterator>
   </s:subset>

<!-- B: List with count -->
   <s:subset source="myList" count="3">
      <s:iterator>
          <s:property />
      </s:iterator>
    </s:subset>

<!--  C: List with start -->
     <s:subset source="myList" count="13" start="3">
        <s:iterator>
          <s:property />
        </s:iterator>
     </s:subset>

<!--  D: List with var -->
     <s:subset var="mySubset" source="myList" count="13" start="3" />
     <%
         Iterator i = (Iterator) pageContext.getAttribute("mySubset");
         while(i.hasNext()) {
     %>
     <%=i.next() %>
     <%  } %>

<!--  D: List with Decider -->
    <s:subset source="myList" decider="myDecider">
           <s:iterator>
                <s:property />
           </s:iterator>
    </s:subset>

Description

Parameters

Dynamic Attributes Allowed:

Name

Required

Default

Evaluated

Type

Description

Examples