Simple Angular JS Paging / Pagination Directive

appCtrl.jade

// this is an example . A simple function that
// calls a service that loads users from an ajax source
//@params {Number} page the number of the page to load 
//@param {Number} limit the amount of items / results to load
//@param {Function} cb a callback function that gets called when
// and if results are returned.

$scope.load_users = function (page, limit, cb) {
    adminService.loadUsers({
          page: page,
          limit: limit
      })
      .then(function (res) {
        if (res.length) {
          cb(res.length);
          $scope.users_list = res;
        }
    });
};

directive.js

app.directive('pagination', [function(){
  function link(scope, element, attrs){

  }
  function pageCtrl ($scope) {
    $scope.currentPage = 0;
    $scope.pageLimit = 10;

    $scope.prevBtn = function () {
      if($scope.currentPage === 0) return false;
      $scope.pageTo({
        currentPage: $scope.currentPage - 1,
        pageLimit: $scope.pageLimit,
        cb: function () {
              --$scope.currentPage;
        }
      });
    };

    $scope.nextBtn = function () {
      // if($scope.currentPage === 0) return false;
      $scope.pageTo({
        currentPage: $scope.currentPage + 1,
        pageLimit: $scope.pageLimit,
        cb: function (len) {
          if (len) {
              ++$scope.currentPage;
          }
        }
      });
    };

    $scope.pagelimit = function(pageLimit){
      $scope.pageTo({
        currentPage: $scope.currentPage,
        pageLimit: pageLimit,
        cb: function(r){
          if(r) $scope.pageLimit = pageLimit;
        }
      });
      //quick hack!! should suffice for now
      $scope.pageLimit = pageLimit;
    };

    // loads the initial page
    $scope.pageTo({
      currentPage: $scope.currentPage,
      pageLimit: $scope.pageLimit,
      cb: function () {

        }
    });

  }
  return {
    link: link,
    scope: {
      pageTo: '&'
    },
    controller: pageCtrl,
    templateUrl: '/templates/pagination'
  };
}]);

pagination.jade

button.btn.btn-success.prevbtn(ng-disabled="currentPage == 0", ng-click="prevBtn()")
  | Previous
.btn-group.dropup
  button.btn.pageNo.btn-bell.btn-small(type="button", style="border-radius: 0")
    |  {{currentPage}}
  button.btn.dropdown-toggle(data-toggle="dropdown", style="border-radius: 0")
    span.caret
  ul.dropdown-menu.alt-text(role="menu", style="text-transform: capitalize;z-index: 99999")
    li
      a(ng-click="pagelimit(10)") 10
    li
      a(ng-click="pagelimit(20)") 20
    li
      a(ng-click="pagelimit(50)") 50
    li
      a(ng-click="pagelimit(100)") 100
button.btn.btn-success.nextbtn(ng-click="nextBtn()")
  | Next