AngularJS directive failing to trigger event binding within the link function

Question

AngularJS directive failing to trigger event binding within the link function

Here is a plunker that you can refer to.

In my project, I have developed two simple element directives, named incButtonOne and incButtonTwo. These directives are designed to track and display the number of times they have been clicked. Each directive has its own local controller and isolate scope. Despite both achieving the same end goal, they utilize slightly different implementations:

The template for incButtonOne includes an ng-click directive within the tag itself, allowing for click tracking by calling a function in the directive's controller.
On the other hand, incButtonTwo utilizes a link function to register a click event handler that triggers the incrementing function in the controller.

While both directives technically work, there seems to be an issue with how incButtonTwo updates its displayed value. Surprisingly, the value is only updated after clicking on incButtonOne, even though the actual value update occurs (as seen when uncommenting the alert statement on line 45). This delay in displaying the updated value has left me puzzled, and I am seeking advice on how to address this problem. Thank you!

javascript angularjs

Answer 1

Answer №1

According to Stanislav Demydiuk, the key is to utilize $apply() in order to update your binding. By incorporating your "increment" function, here is the result:

element.on("click", function() {
     scope.$apply(increment);
});

Important: In this scenario, if clicking on the first button triggers an update on the second button, it's because of the ng-click event that is enclosed within $scope.$apply() (refer to this article).

Answer 2

According to Stanislav Demydiuk, the key is to utilize $apply() in order to update your binding. By incorporating your "increment" function, here is the result:

element.on("click", function() {
     scope.$apply(increment);
});

Important: In this scenario, if clicking on the first button triggers an update on the second button, it's because of the ng-click event that is enclosed within $scope.$apply() (refer to this article).

Answer 3

Answer №2

It is important to remember that when manually registering an event handler, you must also manually invoke the scope.$apply() function in order for changes to take effect.

link: function(scope, element) {
  element.on('click', function() {
     scope.$apply(function() {
        scope.count++;
     });
  });
}

Answer 4

It is important to remember that when manually registering an event handler, you must also manually invoke the scope.$apply() function in order for changes to take effect.

link: function(scope, element) {
  element.on('click', function() {
     scope.$apply(function() {
        scope.count++;
     });
  });
}

AngularJS directive failing to trigger event binding within the link function

Answer №1

Answer №2

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