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Why Am I Getting the \"$injector:modulerr\" Error During My AngularJS Migration to Version 1.3?

DDDOriginal: 2024-11-01 00:10:02718browse

Why Am I Getting the

Angularjs Error: [$injector:modulerr] During Migration to V1.3

In Angularjs, the error [$injector:modulerr] indicates a module dependency issue, specifically when migrating from earlier versions to V1.3.

Pre-V1.3 Angularjs Code:

<code class="html"><body>
  <div ng-controller="Ctrl">
    ...
    <script>
      var Ctrl = function($scope) {
        ...
      };
    </script>
  </div>
</body></code>

Post-V1.3 Angularjs Code:

<code class="html"><body ng-app="app">
  <div ng-controller="Ctrl">
    ...
  </div>
  <script>
    function Ctrl($scope) {
      ...
    }

    angular.module('app', [])
      .controller('Ctrl', ['$scope', Ctrl]);
  </script>
</body></code>

Changes with V1.3:

Global Controller Declaration Disabled: After Angularjs V1.3, global controller functions cannot be declared outside a module. Instead, controllers must be registered within a module.
ng-app Directive Required: The ng-app directive must be present on the root element to bootstrap the Angularjs application.

Solution:

Create an Angularjs Module: Use angular.module() to define a module named 'app'.
Register Controller within the Module: Call .controller() on the module to define a controller named 'Ctrl' with the appropriate dependencies and the controller function.
Add ng-app to the Root Element: Ensure the root HTML element has the ng-app attribute.

Additional Notes:

It's recommended to use the latest version of Angularjs (1.6 or higher) for stability and security reasons.
If you need to support global controller declarations, you can use angular.config().allowGlobalScoping(). However, this isn't the best practice.

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