Create a specialized angular controller

Question

Create a specialized angular controller

Is there a way to create a custom controller programmatically while preserving scope inheritance? I am looking to achieve something similar to this:

var controller = 'myCtrl';
var html = '<p>{{value}}</p>';
var validScope= $scope.$new({
    value : 'Hello, custom controllers'
}); // Or some other method to maintain valid scope inheritance
$(document.body).append(instantiate(controller, html, validScope));

I need assistance with two things: how to instantiate a custom controller and how to do it using Angular-like techniques.

UPDATE. I attempted the following approach:

$compile('<div ng-controller="myCtrl">'+html+'</div>')(validScope);

The controller was instantiated successfully. However, the bound values were not updated.

javascript angularjs

Answer 1

Answer №1

When trying to access a controller from another context, it is important to understand whether you are in a different controller, service, or directive.

Below is an example of how to create a controller from a service. While the following code may cover more than necessary, it provides a pattern that will function effectively.

To start, establish an abstract controller which sets constructor parameters and separates dependencies:

module.factory('AbstractCtrl', ['dependencies...', function (dependencies...) {
    var ctrl = function($scope) {
           // Perform controller setup.
    };

    return ctrl;
}]);

Next, create a controller implementation based on the abstract controller:

module.controller('CtrlImpl', ['$scope', 'AbstractCtrl', function ($scope, AbstractCtrl) {
    // Initialize the parent controller and extend it.
    var AbstractCtrlInstance = new AbstractCtrl($scope);
    $.extend(this, AbstractCtrlInstance);
    // … Additional extensions for creating a mixin.
}]);

Now that you have a controller with a basic constructor defined, to create an instance of the controller simply inject $controller and execute the following:

$controller('CtrlImpl', {$scope: $scope}));

Answer 2

When trying to access a controller from another context, it is important to understand whether you are in a different controller, service, or directive.

Below is an example of how to create a controller from a service. While the following code may cover more than necessary, it provides a pattern that will function effectively.

To start, establish an abstract controller which sets constructor parameters and separates dependencies:

module.factory('AbstractCtrl', ['dependencies...', function (dependencies...) {
    var ctrl = function($scope) {
           // Perform controller setup.
    };

    return ctrl;
}]);

Next, create a controller implementation based on the abstract controller:

module.controller('CtrlImpl', ['$scope', 'AbstractCtrl', function ($scope, AbstractCtrl) {
    // Initialize the parent controller and extend it.
    var AbstractCtrlInstance = new AbstractCtrl($scope);
    $.extend(this, AbstractCtrlInstance);
    // … Additional extensions for creating a mixin.
}]);

Now that you have a controller with a basic constructor defined, to create an instance of the controller simply inject $controller and execute the following:

$controller('CtrlImpl', {$scope: $scope}));

Answer 3

Answer №2

In my opinion, the most effective approach is to create a function within the scope that can retrieve your controller. By using the ngController directive with either a string or a function parameter, you can dynamically handle different values that require separate constructors. Here is a rough example of how this could be implemented:

<div ng-repeat="item in items">
  <div ng-controller="controllerFor(item)">
    // content here
  </div>
</div>

The controllerFor function will take care of mapping for you, potentially eliminating the need to use $compile altogether.

Answer 4

In my opinion, the most effective approach is to create a function within the scope that can retrieve your controller. By using the ngController directive with either a string or a function parameter, you can dynamically handle different values that require separate constructors. Here is a rough example of how this could be implemented:

<div ng-repeat="item in items">
  <div ng-controller="controllerFor(item)">
    // content here
  </div>
</div>

The controllerFor function will take care of mapping for you, potentially eliminating the need to use $compile altogether.

Create a specialized angular controller

Answer №1

Answer №2

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