Bootstrapping angular app based on multiple modules

29 Dec 2023
Beginner
23K Views
2 min read  

AngularJS is automatically initialized for one module. But sometimes, it is required to bootstrap for multiple modules and it can be achieved by using two methods:

  1. Automatic bootstrap (by combining multiple modules into one module)

    You can combine multiple modules into single modules and your angular app will be automatically initialized for newly created module and other modules will act as dependent modules for newly created module.

    For example, suppose you have two modules: module1 and model2, and you have to initialize your app automatically based on these two modules then you achieve this following way:

    <html>
    <head>
     <title>Multiple modules bootstrap</title>
     <script src="lib/angular.js"></script>
     <script>
     //module1
     var app1 = angular.module("module1", []);
     app1.controller("Controller1", function ($scope) {
     $scope.name = "Shailendra Chauhan";
     });
    
     //module2
     var app2 = angular.module("module2", []);
     app2.controller("Controller2", function ($scope) {
     $scope.name = "Deepak Chauhan";
     });
    
     //module3 dependent on module1 & module2
     angular.module("app", ["module1", "module2"]);
     </script>
    </head>
    <body>
     <!--angularjs autobootstap process-->
     <div ng-app="app">
     <h1>Multiple modules bootstrap</h1>
     <div ng-controller="Controller2">
     {{name}}
     </div>
     <div ng-controller="Controller1">
     {{name}}
     </div>
     </div>
    </body>
    </html>
    
    
  2. Manual bootstrap

    You can manually bootstrap your app by using angular.bootstrap() function, for multiple modules.

    The above example can be rewritten as for manual bootstrap process as given below:

    <html>
    <head>
     <title>Multiple modules bootstrap</title>
     <script src="lib/angular.js"></script>
     <script>
     //module1
     var app1 = angular.module("module1", []);
     app1.controller("Controller1", function ($scope) {
     $scope.name = "Shailendra Chauhan";
     });
    
     //module2
     var app2 = angular.module("module2", []);
     app2.controller("Controller2", function ($scope) {
     $scope.name = "Deepak Chauhan";
     });
    
     //manual bootstrap process
     angular.element(document).ready(function () {
     var div1 = document.getElementById('div1');
     var div2 = document.getElementById('div2');
    
     //bootstrap div1 for module1 and module2
     angular.bootstrap(div1, ['module1', 'module2']);
    
     //bootstrap div2 only for module1
     angular.bootstrap(div2, ['module1']);
     });
     </script>
    </head>
    <body>
     <!--angularjs autobootstap process-->
     <div id="div1">
     <h1>Multiple modules bootstrap</h1>
     <div ng-controller="Controller1">
     {{name}}
     </div>
     <div ng-controller="Controller2">
     {{name}}
     </div>
     </div>
    
     <div id="div2">
     <div ng-controller="Controller1">
     {{name}}
     </div>
     </div>
    </body>
    </html>
    
    What do you think?

    I hope you have got, how to bootstrap your angular app based on multiple modules. I would like to have feedback from my blog readers. Your valuable feedback, question, or comments about this article are always welcome. For a more in-depth understanding of Angular's module-based bootstrapping and advanced concepts, consider exploring an Angular certification course.

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About Author
Shailendra Chauhan (Microsoft MVP, Founder & CEO at Scholarhat by DotNetTricks)

Shailendra Chauhan is the Founder and CEO at ScholarHat by DotNetTricks which is a brand when it comes to e-Learning. He provides training and consultation over an array of technologies like Cloud, .NET, Angular, React, Node, Microservices, Containers and Mobile Apps development. He has been awarded Microsoft MVP 8th time in a row (2016-2023). He has changed many lives with his writings and unique training programs. He has a number of most sought-after books to his name which has helped job aspirants in cracking tough interviews with ease.
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