hide fields in sharepoint forms by name using jquery


$('tr:has(input[title=Disclaimer])').not('tr:has(tr)').hide();
$("nobr:contains('Packaging Number')").closest('tr').hide(); 


disable fields 
  jQuery("SELECT[title*='ClientName']").attr('disabled', true);


http://davidlozzi.com/2014/01/14/sharepoint-2013-script-hide-or-disable-your-fields/