You could use a few different options, but I think the easiest for you would be to setup the $scope.isMain
value on controller initialisation by looking at $location
. So inside the controller you could have something like:
var loc = $location.path();
if(loc === /* some route rule you require */){
$scope.isMain = true;
}
Have a look here: http://docs.angularjs.org/api/ngRoute/service/$route as the example down the bottom has a few different examples of what sort of data you can access with regards to the route.