使用$ http加载json数据时的Angular-grid

I am using ag-grid plugin in a project. I get json data using $http service. But the grid shows blank in web page. But when json data is applied directly, grid works. I think this is probably due to delay in getting the data from $http. But as per angular concept, the grid should be updated when data comes. Is there any solution to show the html page only when data comes from the server.I am using ag-grid plugin in a project. I get j