The worth of the scope is evident, yet it remains undefined when trying to access it

Currently, I am in the process of developing an AngularJS directive. However, I have encountered an issue where a scope variable appears to be undefined when attempting to access it. Interestingly, upon printing out the scope, it is evident that the variable does indeed contain a value.

To further investigate this matter, please refer to your JavaScript console as that is where I have displayed this information.

For demonstration purposes, you can view a Plunker example here: http://plnkr.co/edit/1cSVZJgtlUazOqTuCNOK

javascriptangularjsangularjs-directive

Answer №1

The reason for this issue is due to the <form> directive not being compiled before the compilation of the usernameAvailable directive, as it is a child scope of form. When you use console.log() to print the value, it actually displays the reference of the $scope object at that moment. To access the correct value, one workaround is to utilize $timeout().

Check out the DEMO here

app.directive('usernameAvailable', ['$http', '$q', '$timeout', function($http, $q, $timeout) {
  return {
    restrict: 'A',
    require: 'ngModel',
    scope: {
      usernameAvailable: '='
    },
    link: function(scope, elem, attr, controller) {
      $timeout(function() {
        scope.usernameAvailable.$asyncValidators.usernameAvailable = function(username) {
          if (typeof(getCurrentUsername) !== 'undefined' && username === getCurrentUsername()) {
            return $q.resolve();
          } else {
            return $http.get('/user/usernameAvailable?username=' + username).success(function(result) {
              if (result) {
                return $q.resolve();
              } else {
                return $q.reject();
              }
            });
          }
        };  
      });

    }
  }
}]);

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