Utilizing Angular 1.5 and ES6 to Enhance Dependency Injection

Question

Utilizing Angular 1.5 and ES6 to Enhance Dependency Injection

Hi there, I am currently exploring Angular and attempting to integrate ES6 into my workflow.

I seem to be facing an issue with dependency injection where I cannot seem to get it working as expected.

Here is a snippet from my index.js file:


    import './index-state.css!';
    import angular from 'angular';
    import 'angular-ui-router';
    import IndexStateController from './index-state-controller';
    import indexRouteConfig from './index-route';

    const dependencies = [
        'ui.router'
    ];

    export default angular
        .module('index-state-component', dependencies)
        .controller('IndexStateController', IndexStateController)
        .config(indexRouteConfig);

In addition, here is the content of my index-state.controller.js :


    class IndexStateController {
        constructor($timeout) {
            this.$timeout = $timeout;
            this.controllerName = 'Example Controller';
            console.log(this.$timeout);
        }

    }

    IndexStateController.$inject =['$timeout'];

    export default [
        IndexStateController
    ];

The issue that I am encountering is that when I attempt to log `this.$timeout`, it returns 'undefined' in the console. Can someone provide guidance on how to resolve this problem?

Your assistance would be greatly appreciated. Thank you!

javascript angularjs ecmascript-6

Answer 1

Answer №1

It seems like the issue lies in how you are exporting your controller class. Instead of exporting an array with the controller inside, which overrides the $inject attribute with empty dependencies, try exporting just the controller class itself:

export default IndexStateController;

Alternatively, you can include the injection values in the export like this:

export default [
    '$timeout',
    IndexStateController
];

If you are using tools like gulp for building your code, consider compiling es6 with babel and using ngAnnotate for automatic injection. Make sure to mark the class as requiring injection like this:

class IndexStateController {
    constructor($timeout) {
        "ngInject"
        this.$timeout = $timeout;
        this.controllerName = 'Example Controller';
        console.log(this.$timeout);
    }

}
export default IndexStateController;

Answer 2

It seems like the issue lies in how you are exporting your controller class. Instead of exporting an array with the controller inside, which overrides the $inject attribute with empty dependencies, try exporting just the controller class itself:

export default IndexStateController;

Alternatively, you can include the injection values in the export like this:

export default [
    '$timeout',
    IndexStateController
];

If you are using tools like gulp for building your code, consider compiling es6 with babel and using ngAnnotate for automatic injection. Make sure to mark the class as requiring injection like this:

class IndexStateController {
    constructor($timeout) {
        "ngInject"
        this.$timeout = $timeout;
        this.controllerName = 'Example Controller';
        console.log(this.$timeout);
    }

}
export default IndexStateController;

Utilizing Angular 1.5 and ES6 to Enhance Dependency Injection

Answer №1

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