Expand Group entity to to individual Users entities for People Editor

entityeditorutils.js

//Expand Group entity to to individual Users entities
function expandGroupEntity(groupEntity, fnCallback) {

    var context = new SP.ClientContext.get_current();
    var groups = context.get_web().get_siteGroups();
    var groupId = getSPGroupIdForEntity(groupEntity);
    var group = groups.getById(groupId);
    this.users = group.get_users();
    context.load(users);
    context.add_requestSucceeded(onLoaded);
    context.add_requestFailed(onFailure);
    context.executeQueryAsync();
    function onLoaded() {
        var userEntities = '<Entities>';
        var count = users.get_count();
        for (i = 0; i < count; i++) {
            var userItem = users.itemAt(i);
            userEntities += UserEntryToXml(userItem);
        }
        userEntities += '</Entities>'; 
        var results = GetEntities(userEntities);
        fnCallback(groupEntity,results);
    }

    function onFailure(sender, args) {
        fnCallback(groupEntity,null);
    }
}

//Create Entity xml fron SPUser 
function UserEntryToXml(userItem)
{
    return '<Entity Key="' + userItem.get_loginName() + '" DisplayText="' + userItem.get_title() + '" IsResolved="True" Description="' + userItem.get_loginName() + '"><MultipleMatches /></Entity>';
}



function prepareUserEntities(result,ctx,fnCallback)
{
   
   var entities=GetEntities(result);
   if (entities==null)
  	  return;
	 for(var x=0;x<entities.childNodes.length;x++)
	 {
		   var entity=entities.childNodes[x];	
		   if(isSPGroupEntity(entity)) {
            expandGroupEntity(entity,fnCallback);
       }
       else
          fnCallback(null,null);
	 }	
}



function getSPGroupIdForEntity(entity)
{
   var groupId = -1;
   var keys = EntityEditor_SelectNodes(entity,"Key");
   for (var i=0;i<keys.length;i++) {
       if(keys[i].firstChild.nodeValue == "SPGroupID") {
            groupId = parseInt(keys[0].nextSibling.firstChild.nodeValue);
            break; 
       }
   }
   return groupId;
}





function isSPGroupEntity(entity)
{
   var isSPGroupEntity = false;
   var keys = EntityEditor_SelectNodes(entity,"Key");
   for (var i=0;i<keys.length;i++) {
       if(keys[i].firstChild.nodeValue == "SPGroupID") {
            isSPGroupEntity = true;
            break; 
       }
   }
   return isSPGroupEntity;
}



var EntityEditorCallback = (function () {
    var EntityEditorCallbackOrig = EntityEditorCallback;

    return function() {
        var result = arguments[0];
        var ctx = arguments[1];
        prepareUserEntities(result,ctx,function (groupEntity,userEntities) {
           if (groupEntity != null) {
               result = result.replace(EntitytoHtml(groupEntity),UserEntitiestoHtml(userEntities));
           }
           EntityEditorCallbackOrig(result, ctx);
        });
    };

})();

//Serialize user entities to Html
function UserEntitiestoHtml(entities)
{
    var entityHtml = '';
    for(i=0;i<entities.childNodes.length;i++)
       entityHtml += EntitytoHtml(entities.childNodes[i]);
    return entityHtml;
}





//Serialize entity to Html 
function EntitytoHtml(entity)
{
    var entityHtml = EntityEditor_XmlToString(entity);
    entityHtml = entityHtml.replace(/<MultipleMatches\/>/g, '<MultipleMatches />');
    return entityHtml;
}




//Entity Editor Helper methods

//select nodes from xml entity
function EntityEditor_SelectNodes(xmlNode, tagName)
{ULSGjk:;
	//if(document.implementation && document.implementation.createDocument)
	//{
		var elems=xmlNode.getElementsByTagName(tagName);
		if(elems.length > 0)
			return elems;
		return null;
	//}
	//else
	//{
	//	return xmlNode.selectNodes(tagName);
	//}
}


//Serialize Xml to String
function EntityEditor_XmlToString(xmlData) { 

    var xmlString;
    //IE
    if (window.ActiveXObject){
        xmlString = xmlData.xml;
    }
    // code for Mozilla, Firefox, Opera, etc.
    else{
        xmlString = (new XMLSerializer()).serializeToString(xmlData);
    }
    return xmlString;
}