closes #4545

public/src/admin/manage/users.js

@@ -268,7 +268,27 @@ define('admin/manage/users', ['admin/modules/selectable'], function(selectable)
 
 		handleUserCreate();
 
+		handleInvite();
+
 	};
 
+	function handleInvite() {
+		$('[component="user/invite"]').on('click', function() {
+			bootbox.prompt('Email: ', function(email) {
+				if (!email) {
+					return;
+				}
+
+				socket.emit('user.invite', email, function(err) {
+					if (err) {
+						return app.alertError(err.message);
+					}
+					app.alertSuccess('An invitation email has been sent to ' + email);
+				});
+			});
+		});
+	}
+
+
 	return Users;
 });

src/controllers/admin/users.js

@@ -166,6 +166,12 @@ function render(req, res, data) {
 	data.search_display = 'hidden';
 	data.pagination = pagination.create(data.page, data.pageCount, req.query);
 	data.requireEmailConfirmation = parseInt(meta.config.requireEmailConfirmation, 10) === 1;
+
+	var registrationType = meta.config.registrationType;
+
+	data.inviteOnly = registrationType === 'invite-only' || registrationType === 'admin-invite-only';
+	data.adminInviteOnly = registrationType === 'admin-invite-only';
+
 	res.render('admin/manage/users', data);
 }
 

src/views/admin/manage/users.tpl

@@ -139,8 +139,15 @@
 		<div class="panel panel-default">
 			<div class="panel-heading">Users Control Panel</div>
 			<div class="panel-body">
-				<button id="createUser" class="btn btn-primary">New User</button>
+				<button id="createUser" class="btn btn-primary form-control">New User</button>
-				<a target="_blank" href="{config.relative_path}/api/admin/users/csv" class="btn btn-primary">Download CSV</a>
+				<a target="_blank" href="{config.relative_path}/api/admin/users/csv" class="btn btn-primary form-control">Download CSV</a>
+
+				<!-- IF inviteOnly -->
+				<!-- IF loggedIn -->
+				<button component="user/invite" class="btn btn-success form-control"><i class="fa fa-users"></i> Invite</button>
+				<!-- ENDIF loggedIn -->
+				<!-- ENDIF inviteOnly -->
+
 			</div>
 		</div>
 	</div>

src/views/admin/settings/user.tpl

@@ -128,6 +128,13 @@
 					<option value="admin-invite-only">Admin Invite Only</option>
 					<option value="disabled">No registration</option>
 				</select>
+				<p class="help-block">
+					Normal - Users can register from the /register page.<br/>
+					Admin Approval - User registrations are placed in an <a href="{config.relative_path}/admin/manage/registration">approval queue</a> for administrators.<br/>
+					Invite Only - Users can invite others from the <a href="{config.relative_path}/users" target="_blank">users</a> page.<br/>
+					Admin Invite Only - Only administrators can invite others from <a href="{config.relative_path}/users" target="_blank">users</a> and <a href="{config.relative_path}/admin/manage/users">admin/manage/users</a> pages.<br/>
+					No registration - No user registration.<br/>
+				</p>
 			</div>
 			<div class="form-group">
 				<label>Maximum Invitations per User</label>