Utilizing the powerful combination of Organizational MVC and Angular to prevent unnecessary injections into the system

Question

Utilizing the powerful combination of Organizational MVC and Angular to prevent unnecessary injections into the system

One issue I'm facing is that I have only one ng-app. Does this mean I need to do dependency injection for plugins that may not be used on a particular view? For example, if I include ngTagsInput, does that mean I have to include it in every view even if it's not necessary? This could potentially lead to unnecessary inclusion of JavaScript files.

I am working on a large MVC .NET application and trying to determine the best approach for importing external plugins.

In our main _Layout template, we have code similar to:

<html ng-app="ourApp">
    <head>
     <!-- all of our includes are here -->
    </head>

    <body>
        <directive></directive>
        <anotherdirective></anotherdirective>

        @RenderBody()    
    </body>
</html>

The RenderBody function inserts views from our MVC routing. A sample view may look like this:

<script src="~/Scripts/HomeAngular.js"></script>
<div ng-controller="HomeCtrl">
    <directive3></directive3>
</div>

Application JS file:

var app = angular.module('ourApp', ['ngTagsInput']);

Is there a way to avoid injecting ngTagsInput on every view page, especially when it's not required?

javascript asp.net-mvc angularjs asp.net-mvc-4

Answer 1

Answer №1

When it comes to implementing Dependency Injection (DI) in Angular, there are a variety of approaches you can take. One method involves defining the ngTagsInput service before declaring the controller. If ngTagsInput is indeed a service, you will need to create an object with functions that allow you to interact with the data within that service.

For instance:

app.service('ngTagsInput', function($scope) {
  var data = {};

  return {
    getData: function() {
      return data;
    },
    setData: function(val) {
      data = val;
    }
  };
});

app.controller('HomeCtrl', function($scope, ngTagsInput) {
  // ...
  $scope.tags = ngTagsInput; // manipulate as needed
});

On the flip side...

In the previous example, if you minify that code, $scope could be renamed as any variable (a, b, x, etc...) and Angular might not recognize it.

In this alternative technique, we utilize an array. The last element in the array represents the controller's inline function, which accepts one parameter for each preceding item in the array:

app.controller('HomeCtrl', ['$scope', 'ngTagsInput', function(scp, ngTagIn) {
  // ...
}]);

This approach allows for successful minification since the dependencies are specified as strings within the array and can be reassigned to different names inside the function's arguments.

Dependency Injection can also be implemented in directives, factories, filters, and services using the same pattern, not restricted to just controllers and modules.

app.directive('HomeCtrl', ['$scope', 'ngTagsInput', function(scp, ngTagIn) {
  // ...
}]);

Answer 2

When it comes to implementing Dependency Injection (DI) in Angular, there are a variety of approaches you can take. One method involves defining the ngTagsInput service before declaring the controller. If ngTagsInput is indeed a service, you will need to create an object with functions that allow you to interact with the data within that service.

For instance:

app.service('ngTagsInput', function($scope) {
  var data = {};

  return {
    getData: function() {
      return data;
    },
    setData: function(val) {
      data = val;
    }
  };
});

app.controller('HomeCtrl', function($scope, ngTagsInput) {
  // ...
  $scope.tags = ngTagsInput; // manipulate as needed
});

On the flip side...

In the previous example, if you minify that code, $scope could be renamed as any variable (a, b, x, etc...) and Angular might not recognize it.

In this alternative technique, we utilize an array. The last element in the array represents the controller's inline function, which accepts one parameter for each preceding item in the array:

app.controller('HomeCtrl', ['$scope', 'ngTagsInput', function(scp, ngTagIn) {
  // ...
}]);

This approach allows for successful minification since the dependencies are specified as strings within the array and can be reassigned to different names inside the function's arguments.

Dependency Injection can also be implemented in directives, factories, filters, and services using the same pattern, not restricted to just controllers and modules.

app.directive('HomeCtrl', ['$scope', 'ngTagsInput', function(scp, ngTagIn) {
  // ...
}]);

Answer 3

Answer №2

Have you considered breaking down your application into smaller modules rather than having just one large module? By injecting the smaller modules into the app module and only including the ngTagsInput dependency where necessary, you can improve organization and increase efficiency. This approach is how I usually structure my applications based on function or area.

Answer 4

Have you considered breaking down your application into smaller modules rather than having just one large module? By injecting the smaller modules into the app module and only including the ngTagsInput dependency where necessary, you can improve organization and increase efficiency. This approach is how I usually structure my applications based on function or area.

Utilizing the powerful combination of Organizational MVC and Angular to prevent unnecessary injections into the system

Answer №1

Answer №2

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