demo/hub-demo-portlet/src/main/webapp/WEB-INF/jsp/view-pap.jsp

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<%@ page session="false" %>
<%@ taglib uri="http://xmlns.jcp.org/portlet_3_0"  prefix="portlet" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>

<portlet:defineObjects />

<%
   StringBuffer style = new StringBuffer(256);
   style.append("border-style:solid; border-width:3px;");
   style.append(" padding:4px; overflow:auto;");
   style.append(" border-color:#008800; min-height:30px;");
   style.append(" background:#E0E0E0;");
%>

<h3>Partial Action Portlet</h3>
<hr/>
<p>This portlet exercises the Partial Action execution path.</p>
<form onsubmit='return false;' enctype='application/x-www-form-urlencoded'><input id='<portlet:namespace/>-doPA' type='submit' name='action' value='Do Partial Action' /></form>
<div id='<portlet:namespace/>-responseDiv' style="<%=style.toString()%>"></div>
   
<script>
(function () {
   'use strict';
   var pid = '<portlet:namespace/>',
       resdiv = '<portlet:namespace/>-responseDiv',
       paButton = '<portlet:namespace/>-doPA',
   
       state,
       hub,
   
   // Handler for onStateChange event
   update = function (type, s, renderData) {
      var nc = s.getValue('color', '#E0E0E0');
      console.log("PAP: state updated. Event type = " + type);
      
      // change background color for message box
      if (state.getValue('color') !== nc) {
         document.getElementById(resdiv).style.background = nc;
      }
      state = s;
      if ((renderData !== undefined) && (renderData !== null)) {
         document.getElementById(resdiv).innerHTML = renderData.content;
      }
   };
   
   // Handler for "partial action" button. Perform partial action sequence.
   document.getElementById(paButton).onclick = function () {
      var xhr = new XMLHttpRequest(), vals, pagestate = null, markup, actparms, actvals; 
      console.log("PAP: Partial action button clicked.");
      
      // Add the render parameter counter as action parameter
      actparms = hub.newParameters();
      actvals = state.getValues('numActions');       
      if (actvals) {
         actparms['numActions'] = actvals;
      }
      
      hub.startPartialAction(actparms).then(function (pai) {
         
         console.log("PAP: got partial action init object. URL: " + pai.url);
         
         xhr.onreadystatechange = function () {
            if (xhr.readyState === 4) {
               if (xhr.status !== 200) {
                  console.log("XHR error: " + xhr.status);
               }
               // Make sure setPageState is called even in error case in order to unblock the P.H.
               pai.setPageState(xhr.responseText);
            }
         };
         xhr.open("POST",pai.url,true);
         xhr.send();
         
      });
   };
   
   // Register portlet with Portlet Hub; add onStateChange listener 
   portlet.register(pid).then(function (pi) {
      console.log("PAP: registered: " + pid);
      hub = pi;
      state = hub.newState();
      hub.addEventListener("portlet.onStateChange", update);
   });
   
}());
</script>