AngularJS directive: Cookie value not being applied to data binding operation

I've developed a directive that includes a dropdown list of organizations to which the user is assigned:

.directive('orgList', ['$rootScope', '$state', 'Auth', 'ipCookie', function ($rootScope, $state, Auth, ipCookie) {
    return {
        restrict: 'A',
        replace: true,
        template: '<div class="form-group"><div class="input-group">'+ 
            '<span class="input-group-addon"><b>My Organizations</b></span>'+
             '<select class="form-control" ng-model="selectedOrg"'+
                  'ng-options="org.name for org in orgs"></select>'+
                '</div></div>',
        link: function(scope, elem, attrs) {
                scope.orgs = Auth.user.organizations;
                scope.selectedOrg = ipCookie('selectedOrg') || _.first(scope.orgs);

                scope.$watch('selectedOrg', function (value) {
                    if(!_(value).isEmpty()) {
                        ipCookie('selectedOrg', value);

                        var temp = { 
                            role: Auth.userRoles[value.role] || Auth.user.role 
                        }
                        _(Auth.user).extend(temp);
                        $rootScope.$broadcast('userRoleChanged', value.id);
                    }
                });

                scope.$on('userRoleChanged', function (event, id) {
                    if(!Auth.authorize(Auth.accessLevels.admin)) {
                        if($state.current.url.match('/organization/')) {
                            $state.go('private.profile');
                        }
                    } 
                });
            }
        }
    }
}])

My next objective is to store the user's organization selection for future visits: after the user chooses an organization from the dropdown, I want them to see the same organization when they revisit the page.

Here's the issue at hand:

scope.selectedOrg = ipCookie('selectedOrg') || _.first(scope.orgs);

If the cookie is not defined and the _.first(scope.orgs) part is selected, the dropdown displays the organization as expected. However, if I retrieve the value from the cookie, the dropdown appears empty. console.log() confirms that the selectedOrg is correct in both scenarios.

Answer №1

The likely reason behind this issue is related to object identity.

What this implies is that the data retrieved from the ipCookie() service might resemble an entry from the orgs list in terms of content (i.e., the fields match when compared individually), but the actual objects are distinct in the JavaScript a === b context. Angular is currently set up to utilize the JS equality comparison.

To address this, you have a couple of options:

  1. Consider incorporating the track by clause:

    <select ... ng-options="org.name for org in orgs track by org.id">
    
  2. If ipCookie('selectedOrg') provides a result, avoid assigning it directly to scope.selectedOrg; instead, look for the exact object within your orgs array and assign that specific object to scope.selectedOrg.

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