Unlocking Controller Functions in AngularJS Directives: A Step-by-Step Guide

Here is a sample controller and directive code:

class DashboardCtrl {
  constructor ($scope, $stateParams) {
    "ngInject";

    this.$scope = $scope;
    this.title = 'Dashboard';
  }
  loadCharts () {
    // some logic here
  }
 }

export default DashboardCtrl;

Now let's take a look at the directive:

class TreeNodeTooltip {
  constructor ($scope, $state) {
    "ngInject";

    this.$scope = $scope;
    this.$state = $state;
    this.scope = {
        loadCharts: '&'
    };
  }
  link (scope, elem, attrs) {
    $(elem).on('click', '.node-name', (e) => {
       console.log(this.$scope.loadCharts());
       console.log(this.scope.loadCharts());
       console.log(this.$scope.main.loadCharts());
    }
  }
}

Having trouble accessing the controller function from the directive? Any suggestions on how to make it work?

Answer №1

It seems there may be some confusion about the functionality of Angular's .directive(). This method is not used to register classes for directive instances, but rather to register a directive factory class.

Based on your question, it appears that TreeNodeTooltip is the directive factory being registered. In this scenario, services can be injected into the constructor using $injector, but direct access to $scope within the constructor may lead to errors.

The actual instance of the directive is initialized through the postLink / link function, where the directive's scope becomes available. However, attempting to access scope from the directive definition using this.scope does not align with typical patterns.

To make more sense of the provided code, consider the following modification:

class TreeNodeTooltip {
  constructor () {
    this.scope = {
        loadCharts: '&'
    };
  }
  link (scope, elem, attrs) {
    $(elem).on('click', '.node-name', (e) => {
       console.log(scope.loadCharts());
    });
  }
}

This adjusted code snippet can then be used in the template as shown below:

<!-- ngController only required if it is not registered as state controller -->
<div ng-controller="DashboardCtrl as dashboardCtrl">
    <tree-node-tooltip load-charts="dashboardCtrl.loadCharts()" />
</div>

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