Angular CRUD delete row from modal

I am using a simple CRUD API in MEAN STACK with a delete function

 app.delete('/api/users/:user_id', function(req, res) {
    users.remove({
        _id : req.params.user_id
    }, function(err, user) {
        if (err)
            res.send(err);
        users.find(function(err, users) {
            if (err)
                res.send(err)
            res.json(users);
        });
    });
});

The controller

var app = angular.module('usersList', []);
app.controller('usersController', function($scope, $http) {

$http.get('/api/users')
    .success(function(userData) {
        $scope.users = userData;
        $scope.length = userData.length;
    })
    .error(function(data) {
        console.log('Error: ' + data);
    });

$scope.deleteUser = function(id) {
    $http.delete('/api/users/' + id)
        .success(function(data) {
            $scope.users = data;
            console.log(data);
        })
        .error(function(data) {
            console.log('Error: ' + data);
        });
};

});

In the HTML file I populate a table as follow with a btn to open modal with corresponding user details by getting the {{$index}}

 <body data-ng-controller="usersController">            
        <table>
            <thead>
                <tr>
                    <th>#</th>
                    <th>ID</th>
                    <th>Login</th>
                    <th>Email</th>
                    <th>Action</th>
                </tr>
            </thead>
            <tbody>
                <tr data-ng-repeat="userData in users" >
                    <td><input type="checkbox"/></td>
                    <td>{{ userData._id }}</td>
                    <td>{{ userData.id_userLogin }}</td>
                    <td>{{ userData.email }}</td>
                    <td>                            
                        <!-- Button trigger for Delete modal -->
                        <button type="button" data-toggle="modal" data-target="#deleteModal{{$index}}" data-ng-click="Clear()">
                        <span class="glyphicon glyphicon-trash"></span>
                        </button>
                        <!-- Delete Modal -->
                        <div class="modal fade" id="deleteModal{{$index}}" tabindex="-1" role="dialog">
                          <div class="modal-dialog">
                            <div class="modal-content">
                              <div class="modal-header">
                                <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span></button>
                                <h4 class="modal-title" id="myModalLabel">Delete <strong>{{ userData.id_userLogin }}</strong> account</h4>
                              </div>
                              <div class="modal-body">
                                <div class="alert alert-danger" role="alert">Are you sure you want to delete this account?</div>
                              </div>
                              <div class="modal-footer">
                                <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
                                <button type="button" class="btn btn-danger" data-ng-click="deleteUser(user._id)">Delete</button>
                              </div>
                            </div>
                          </div>
                        </div>
                    </td>
                </tr>
            </tbody>
        </table>

How can I use the API to delete the corresponding user from the modal as following does not work

<button type="button" class="btn btn-danger" data-ng-click="deleteUser(user._id)">Delete</button>

Screenshot

It is important that the modal is not a confirm delete popup but a modal with content from where the delete button will delete the corresponding user. Any help would be appreciated.

Seem like the problem is solved. I'll just post the answer here. The html of the button should be: 

<button type="button" class="btn btn-danger" data-ng-click="deleteUser(userData._id)">Delete</button>
<!-- Use userData._id instead of user._id-->