Angular: Enhance communication with controllers and directives

Currently, I am in the process of learning Angular. One interesting feature I have been working on is a directive that displays a select element. Whenever there is a change in this select element due to the ng-change event, a specific method defined in the controller of my directive is invoked:

$scope.changeSelect = function(selectedValue) {
  exampleService.setNewValue(selectedValue)
}

The service I implemented is responsible for updating an example value within the application.

Furthermore, there is another controller and view associated with rendering this directive. Within this view, I want to notify the controller whenever the directive undergoes changes and subsequently perform actions based on this updated data.

javascriptangularjscontrollers

Answer №1

To keep track of changes in the variable you are passing, it is recommended to utilize $scope.$watch. For more insights on how watch functions, visit https://docs.angularjs.org/api/ng/type/$rootScope.Scope

$scope.$watch('yourValue', function (oldValue, newValue) {
    //perform an action
});

Answer №2

Implement the ng-model directive in your select input and include the following code snippet:

$scope.$watch('selectedValue', function(newValue, oldValue) {
     exampleService.updateValue(selectedValue)
}, true);

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