The AngularJS asynchronous directive in isolation is malfunctioning

I need to pass an object retrieved from the database to a child directive. Sending data synchronously works fine, but when I fetch the data asynchronously from a remote server, the directive is triggered before the results are received.

Here is the controller that retrieves data from the server:

app.config(function($routeProvider, $locationProvider) {
    $routeProvider.when("/root/cardboards/employees/:_employee", {
        templateUrl: "screens/root/cardboards/employees-detail/employees-detail.html"
    });
    // $locationProvider.html5Mode(true);
});

app.controller("employees-detail", ($rootScope, $scope, $location, $routeParams, Http, Cast) => {
    Http.GET({
        resource: `employees/${$scope._employee}`
    }, (err, response) => {
        if (err) return Cast.error(err);
        $scope.employee = response.data; // employee's object
        $scope.$apply();
    });
});

This is the HTML element for the directive:

<edit-employee employee="employee"></edit-employee>

And here is the js file for the edit-employee directive:

app.directive("editEmployee", ($rootScope, Http, Cast) => {
    return {
        templateUrl: "/screens/root/cardboards/employees-detail/components/edit-employee/edit-employee.html",
        scope: {
            employee: "="
        },
        link: function($scope, element, attrs) {
            console.log($scope.employee); 
        }
    }
});

I assumed that using the = operator would enable two-way binding and the directive would update based on changes in the data fetched after the server request. However, this is not the case.

How should it actually work and what steps should be taken to ensure proper functionality?

Answer №1

When the <edit-employee component is rendered, it attempts to have the employee object do a console log on this line

link: function($scope, element, attrs) {
  console.log($scope.employee); // undefined
}

However, at that moment, the employee object is still undefined as it is waiting for a response from the server. To gain a better understanding of this issue, you can set up a $watch to monitor the employee object within the edit-employee directive. When the HTTP request is complete, the employee object will be updated with the latest value.

How should it work and what should I do, in the most efficient way, to resolve this?

There are different approaches you can take. In situations where I faced this issue before, I used an ng-if condition on

<edit-employee ng-if='employee'
, ensuring that the edit-employee directive is only rendered when the employee object is defined (not undefined).

Another solution is to implement a watch on the employee object inside the edit-employee directive and proceed with the business logic only if the employee object has a value.

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