$(document).ready(function(){
  $('#<portlet:namespace/>country').on('keydown keyup',function(){
    var data = [];
    var text = $(this).val();

    $('#<portlet:namespace/>country').autocomplete({
      source: function(request,response){
        Liferay.Service('/country/get-countries', {
          active: true
        },
        function(obj) {
          for(let i =0;i<obj.length;i++){
            if(obj[i].name.indexOf(text) != -1){
              data.push(obj[i].name);
            }
          }
          response(data);
        });
      }
    })
  });
})