Utilizing a refreshed array of elements within a component directive

Question

Utilizing a refreshed array of elements within a component directive

When working within a view, I am utilizing ng-repeat inside a directive to iterate over an array of objects from my controller. However, as the objects in the array undergo value changes, I encounter a dilemma when transitioning to a new instance of the same directive. My intention is to loop over the updated array of objects once again.

In my attempt to solve this issue, I found that if I make modifications to the objects in the initial view and then pass the same array of objects to the second view, the directive ends up referring back to the original array instead of the updated one. Even after watching for changes in the array, the directive persistently reverts to using the initial array during subsequent instances.

I would greatly appreciate it if someone could shed light on what exactly is happening here and provide guidance on how to tackle this situation effectively.

javascript angularjs arrays

Answer 1

Answer №1

A convenient way to establish a parent-child relationship in AngularJS is by using a directive that can access the scope of both the controller and the view it's added to. This allows for synchronization between an ng-repeat directive within the directive and an array in the controller's scope variable, ensuring two-way data binding. For a demonstration, you can refer to the Plunker I have set up.

Efficient data sharing between controllers and directives relies on two-way data binding; otherwise, manual handling through events or using $watch within the directive may be necessary (especially if incorporating jQuery code).

https://plnkr.co/edit/m47TPgcX7lY8nL1LswCv?p=preview

app.directive('helloWorld', function ($compile, CarCompany) {
  return {
    restrict: 'E',
    template: '<div>\
                  <h2>HelloWorld directive</h2>\
                  <p ng-repeat="car in carc">{{car.name}}</p>\
                  <h3>Liste des marques:</h3>\
              </div>',
    link: function (scope, elem, attrs) {

      var ul = document.createElement('ul');
      var lis = '';
      angular.forEach(CarCompany, function(item) {
        lis += '<li>' + item.name + '</li>';
      });
      ul.innerHTML = lis;

      elem.append(ul);

      $compile(ul)(scope);
    },

  };
});

This simple directive exemplifies the shared scope concept between a controller and a directive.

Answer 2

A convenient way to establish a parent-child relationship in AngularJS is by using a directive that can access the scope of both the controller and the view it's added to. This allows for synchronization between an ng-repeat directive within the directive and an array in the controller's scope variable, ensuring two-way data binding. For a demonstration, you can refer to the Plunker I have set up.

Efficient data sharing between controllers and directives relies on two-way data binding; otherwise, manual handling through events or using $watch within the directive may be necessary (especially if incorporating jQuery code).

https://plnkr.co/edit/m47TPgcX7lY8nL1LswCv?p=preview

app.directive('helloWorld', function ($compile, CarCompany) {
  return {
    restrict: 'E',
    template: '<div>\
                  <h2>HelloWorld directive</h2>\
                  <p ng-repeat="car in carc">{{car.name}}</p>\
                  <h3>Liste des marques:</h3>\
              </div>',
    link: function (scope, elem, attrs) {

      var ul = document.createElement('ul');
      var lis = '';
      angular.forEach(CarCompany, function(item) {
        lis += '<li>' + item.name + '</li>';
      });
      ul.innerHTML = lis;

      elem.append(ul);

      $compile(ul)(scope);
    },

  };
});

This simple directive exemplifies the shared scope concept between a controller and a directive.

Utilizing a refreshed array of elements within a component directive

Answer №1

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