Async postback/updatepanels/loaded after the UI doesnt cause document ready to be executed in SharePoint
For more Information refer below article: http://stackoverflow.com/questions/256195/jquery-document-ready-and-updatepanels http://josharepoint.com/2015/06/16/custom-javascript-function-loaded-after-the-ui-has-loaded-in-sharepoint-2013/ http://stackoverflow.com/questions/3683688/async-postback-doesnt-cause-document-ready-to-be-executed