Exploring the process of executing a directive in AngularJS

Question

Exploring the process of executing a directive in AngularJS

I am just starting to learn AngularJS, particularly the asynchronous programming paradigm, and I'm currently working on my first AngularJS project. While I understand the basics and fundamentals, I have encountered a challenge.
Issue: I need to create a directive only when certain data is available, which is fetched asynchronously. The directive is also part of the controller's template. How should I approach this?
My Strategy: I tried using ng-if="variable" on the directive to be created once the data is ready, along with a watch on that variable to initiate the creation process. However, I'm struggling to implement this programmatically! What would be the best way to achieve this or is there a more efficient approach?

Controller

$scope.dataFetched = false;
$http.get(url)
    .then(function success(result){
        $scope.dataFetched = true;
    });

HTML

<span>Hello World</span>
<directive-abc ng-if="dataFetched"></directive-abc>

Also, how does $digest handle the execution of that particular directive after completing the controller template?

javascript angularjs angularjs-directive frontend angularjs-digest

Answer 1

Answer №1

To insert a directive within an HTML element and apply ng-if to that element, use the following format:

<div ng-if="dataFeteched"><directive-abc ></directive-abc></div>

This will display the directive only if the value of datafetched is true.

Answer 2

To insert a directive within an HTML element and apply ng-if to that element, use the following format:

<div ng-if="dataFeteched"><directive-abc ></directive-abc></div>

This will display the directive only if the value of datafetched is true.

Answer 3

Answer №2

Take a look at the example provided below.

Utilizing Controller and Directive

app.controller('exampleCtrl', function($scope, $http){
    // Initially sets $scope.dataFetched to false
    $scope.dataFetched = false;
    $http.get('https://jsonplaceholder.typicode.com/posts/1')
     .then(function(response){
        // Perform actions based on response
        // Update $scope.dataFetched to true upon callback
        $scope.dataFetched = true;

  });
});
zapp.directive("someDirective", function() {
 return {
     template : "<h1>I am a directive!</h1>"
 };
});

Incorporating HTML

<div ng-controller="exampleCtrl">
  <some-directive ng-show="dataFetched"></some-directive>
</div>

Upon execution, the directive will only appear after the completion of the http call. To verify, you can comment out $scope.dataFetched = true; within the http call and later uncomment it.

Answer 4

Take a look at the example provided below.

Utilizing Controller and Directive

app.controller('exampleCtrl', function($scope, $http){
    // Initially sets $scope.dataFetched to false
    $scope.dataFetched = false;
    $http.get('https://jsonplaceholder.typicode.com/posts/1')
     .then(function(response){
        // Perform actions based on response
        // Update $scope.dataFetched to true upon callback
        $scope.dataFetched = true;

  });
});
zapp.directive("someDirective", function() {
 return {
     template : "<h1>I am a directive!</h1>"
 };
});

Incorporating HTML

<div ng-controller="exampleCtrl">
  <some-directive ng-show="dataFetched"></some-directive>
</div>

Upon execution, the directive will only appear after the completion of the http call. To verify, you can comment out $scope.dataFetched = true; within the http call and later uncomment it.

Exploring the process of executing a directive in AngularJS

Answer №1

Answer №2

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