gistfile1.js

$(function () {
   $(document).ajaxSend(function(event, jqxhr, settings) {

      if(settings.type === 'POST') {
         var _csrf = $('meta[name="_csrf"]').attr('content');
         var _csrf_header = $('meta[name="_csrf_header"]').attr('content');
         if(_csrf && _csrf_header){

            jqxhr.setRequestHeader(_csrf_header, _csrf);
         } else {
            alert('set csrf meta!');
         }
      }

   });
});