[xwiki-users] Livetable can not sort or filter

Hi, Everyone! My xwiki verison is 6.4.3. I want to use the Livetable macro to achieve to manage my table and paging it. But the table can not sort or filter,i really don’t know I was wrong, could you someguys help me? Here is my code: The page I use livetable code： {{velocity}} #set($columns = [ "user" , "message" ]) #set($columnsProperties = { "user" : { "type" : "text" }, "message" : { "type" : "text"} }) #set($options = { "resultPage":"MySpace.MyJSON" }) #livetable("twitter" $columns $columnsProperties $options) {{/velocity}} MySpace. MyJSON: {{velocity wiki="false"}} #if("$!{request.xpage}" == 'plain') $response.setContentType('application/json') #end ##============================== ## Offset = item # at which to start displaying data ##============================== #set($offset = $util.parseInt($request.get('offset'))) ## offset starts from 0 in velocity and 1 in javascript #set($offset = $offset - 1) #if($offset < 0) #set($offset = 0) #end ##================== ## Limit = # of items to display ##================== #set($limit = $util.parseInt($request.get('limit'))) ##================== ## Tag = one parameter per tag ##================== #if($request.tag) #foreach($tag in $request.getParameterValues('tag')) ## TODO: Add code to filter items based on the selected tags #end #end ##========== ## Sort direction ##========== #set($order = "$!request.sort") #if($order != '') #set($orderDirection = "$!{request.get('dir').toLowerCase()}") #if("$!orderDirection" != '' && "$!orderDirection" != 'asc') #set($orderDirection = 'desc') #end #end ## =========== ## Filter Data here... ## =========== ## TODO: Add code to filter data ## Each column can be filtered and the filter for a column can be retrieved with: ## #set($filterValue = "$!{request.get(<columnname>)}") ## === ## JSON ## === { "totalrows": 2, "matchingtags": {}, "tags" : [], "returnedrows": 2, "offset": 1, "reqNo": $util.parseInt($request.reqNo), "rows": [{ "doc_viewable" : true, "user" : "vincent", "message" : "vincent's message" },{ "doc_viewable" : true, "user" : "jack", "message" : "jack's message" }] } {{/velocity}}