st.never st.never - 1 year ago 273
AngularJS Question

Redirecting to a certain route based on condition

I'm writing a small AngularJS app that has a login view and a main view, configured like so:

.when('/main' , {templateUrl: 'partials/main.html', controller: MainController})
.when('/login', {templateUrl: 'partials/login.html', controller: LoginController})
.otherwise({redirectTo: '/login'});

My LoginController checks the user/pass combination and sets a property on the $rootScope reflecting this:

function LoginController($scope, $location, $rootScope) {
$scope.attemptLogin = function() {
if ( $scope.username == $scope.password ) { // test
$rootScope.loggedUser = $scope.username;
$location.path( "/main" );
} else {
$scope.loginError = "Invalid user/pass.";

Everything works, but if I access
I end up bypassing the login screen. I wanted to write something like "whenever the route changes, if $rootScope.loggedUser is null then redirect to /login"


... wait. Can I listen to route changes somehow? I'll post this question anyway and keep looking.

Answer Source

After some diving through some documentation and source code, I think I got it working. Perhaps this will be useful for someone else?

I added the following to my module configuration:

 .config( ['$routeProvider', function($routeProvider) {...}] )
 .run( function($rootScope, $location) {

    // register listener to watch route changes
    $rootScope.$on( "$routeChangeStart", function(event, next, current) {
      if ( $rootScope.loggedUser == null ) {
        // no logged user, we should be going to #login
        if ( next.templateUrl == "partials/login.html" ) {
          // already going to #login, no redirect needed
        } else {
          // not going to #login, we should redirect now
          $location.path( "/login" );

The one thing that seems odd is that I had to test the partial name (login.html) because the "next" Route object did not have a url or something else. Maybe there's a better way?

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