This is the sample code for file upload example in Struts 2 using event handling mechanism
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<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
<s:head theme="ajax" />
<link href="<s:url value="/css/campaign.css"/>" rel="stylesheet"
type="text/css"/>
<title>upload and ajax test</title>
</head>
<script>
function changeApplication()
{
dojo.event.topic.publish("change_Application");
}
</script>
<body>
<s:url id="updateSecondList" action="updateSecondList" />
<s:actionerror />
<s:fielderror />
<s:form id="test_form" name="test_form" action="FileAction"
method="POST" theme="ajax" enctype="multipart/form-data">
<s:select
label="First List"
list="firstList"
name="selectedItem"
onchange="javascript:changeApplication();return false;">
</s:select>
<tr>
<td class="tdLabel"><label class="label">Second List</label></td>
<td>
<s:div showLoadingText="false"
id="details" href="%{updateSecondList}" theme="ajax"
listenTopics="change_Application" formId="test_form">
</s:div>
</td>
</tr>
<s:file name="upload" label="File"/>
<s:submit />
</s:form>
</body>
</html>
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