Is it possible to include a module-level controller within a directive?

I am currently navigating the complexities of controllers, modules, and services in Angular JS.

In my attempt to integrate a controller into my directive, I faced an issue. The controller I intend to reference belongs to the same module as the directive, so one would expect this to function seamlessly:

index.html:

<!DOCTYPE html>
<html ng-app="myApp">
  <head>
    <script src="jquery.js" type="text/javascript"></script>
    <script src="angular.min.js" type="text/javascript"></script>
    <script src="test.js" type="text/javascript"></script>
  </head>
  <body>
    <direct>
        ABC
    </direct>
  </body>
</html>

test.js:

var myApp = angular.module('myApp', []);

myApp.controller('MyCtrl', function($scope) {
    $scope.data = "Hello World!";
});

myApp.directive('direct', function() {
    function link(scope, element, attrs, ctrl) {
        element.on("mouseenter", function() {
            alert(ctrl.data);
        });
    };
    
    return {
        restrict: 'E',
        link: link,
        require: 'MyCtrl', 
        template: '<div>Alert!</div>'
    }
});

Initially, I encountered an error upon page load:

Error: $compile:ctreq
Missing Required Controller
Controller 'MyCtrl', required by directive 'direct', can't be found!

This suggests that Angular is unable to locate the 'MyCtrl' controller within the 'myApp' scope. While it seems like I am specifying the controller in this example, my objective is to access data from 'MyCtrl' without assigning it as the controller for this directive (as it wouldn't align with the semantics).

Am I overlooking any additional prerequisites for this functionality to operate smoothly?

Answer №1

Absolutely, it is definitely possible.

const myApp = angular.module('myApp', []);

myApp.controller('MyCtrl', function($scope) {
    this.data = "Hello World!";
});

myApp.directive('direct', function() {
    function link(scope, element, attrs, ctrl) {
        element.on("mouseenter", function() {
            alert(ctrl.data);
        });
    };

    return {
        restrict: 'E',
        link: link,
        controller: 'MyCtrl', 
        template: '<div>Alert!</div>'
    }
});

Check out a live demo of this code on CSSDeck.

While this example illustrates the concept, using a directive controller might not be necessary unless you specifically need to share behaviors or properties between directives.

Additionally, it's recommended to avoid declaring global variables like var myApp. Instead, opt for method chaining for better code organization.

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