What are the scopes of $http? Why does undefined come with an event from the grid, but not with an event from the button?

Question

Angular

Please tell me
there is a button

<button class="btn btn-primary" ng-click="formKontragentWork_Delete(123)" onclick="return false;">Удалить</button>

and there is ui grid, in which this function is also called in Cell Template

{
                    field: 'id', name: '', enableFiltering: false, cellTemplate: "<button type=\"button\" class=\"btn btn-xs btn-danger\" ng-click=\"grid.appScope.formKontragentWork_Delete(row.entity.id)\"><i class=\"fa fa-remove\">Удалить</i></button> ", width: 80
                }

and here is an interesting situation: in the first case, the function works fine, and in the second, an empty $http (undefined) comes into it, it is not possible to execute an ajax request in the function body. How can this be?