What is the proper way to utilize $apply and $watch in the Angularjs 1.4.10 Directive Structure?

`.directive('counter', function counter() {
  return {
    scope: {},
    bindToController: {
      count: '='
    },
    controller: function () {
      function increaseCount() {
        this.count++;
      }
      function decreaseCount() {
        this.count--;
      }
      this.increaseCount = increaseCount;
      this.decreaseCount = decreaseCount;
    },
    controllerAs: 'counter',
    template: [
      '<div class="todo">',
        '<input type="text" ng-model="counter.count">',
        '<button type="button" ng-click="counter.decreaseCount();">-</button>',
        '<button type="button" ng-click="counter.increaseCount();">+</button>',
      '</div>'
    ].join('')
  };
});

`

I attempted to use $apply in toddmotto's jsfiddle for reference, but it did not work as expected.

Any assistance would be greatly valued.

Answer №1

If you're unsure about how to handle those methods, it's important to remember that injecting $scope into the directive controller is necessary in order to utilize them effectively.

Just like with a typical angular.module('').controller

controller: function ($scope) {
      var vm = this;
      ...

     $scope.$watch(function(){
          return vm.someProp;
      }, function(newVal,oldVal){
          // watch code
     });
    ....

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