Implementing ES6 import syntax in Angular 1.5 application alongside UI Router

Question

Implementing ES6 import syntax in Angular 1.5 application alongside UI Router

I'm working on bringing together Angular 1.5 and UI Router using ES6 import module syntax with Babel & Webpack.

Here is an example from my app.js file:

'use strict';

import angular from 'angular';
import uiRouter from 'angular-ui-router';
...
import LoginCtrl from './login/login.ctrl.js'

const app = angular.module("app", [
        uiRouter,
        ...
    ])
    .config(function($stateProvider, $urlRouterProvider) {
        $stateProvider
            .state('login', {
                url: '/login',
                templateUrl: '...', 
                controller: LoginCtrl,
                controllerAs: 'login' 
            })
    });

In the login/login.ctrl.js file, I have:

'use strict';

export default app.controller("LoginCtrl", function() {
    //code here
});

When I launched my app, I encountered this error message:

ReferenceError: app is not defined
 bundle.js:35422:2
Error: [$injector:modulerr] Failed to instantiate module app due to:
[$injector:nomod] Module 'app' is not available! You either misspelled the module name or forgot to load it.

Another question that arises is how to utilize the "controller: 'loginCtrl as login'" syntax with ES6 import/export?

javascript angularjs angular-ui-router ecmascript-6 es6-module-loader

Answer 1

Answer №1

When you reference the 'app' variable inside 'login/login.ctrl.js', it may not be defined if you import the controller before defining it.

Also, keep in mind that each module has its own scope, so you cannot refer to variables from a different module this way.

To resolve this issue, consider the following steps:

Create a new module inside 'login/login.ctrl.js':

'use strict';

import angular from 'angular';

angular.module('ctrlsModule', [])
    .controller('LoginCtrl', function () {

    });

Add the newly created module as a dependency of your main 'app' module:

'use strict';

import angular from 'angular';
import uiRouter from 'angular-ui-router';
...
import './login/login.ctrl.js';

angular.module('app', [uiRouter, 'ctrlsModule', ...])
    .config(function ($stateProvider, $urlRouterProvider) {
        $stateProvider
             .state('login', {
                url: '/login',
                templateUrl: '...', 
                controller: 'LoginCtrl',
                controllerAs: 'login' 
            });
    });

Although I haven't tested the code myself, I hope this clarifies the solution. Regarding your second question, controllerAs in ES6 should function similarly to ES5.

Answer 2

When you reference the 'app' variable inside 'login/login.ctrl.js', it may not be defined if you import the controller before defining it.

Also, keep in mind that each module has its own scope, so you cannot refer to variables from a different module this way.

To resolve this issue, consider the following steps:

Create a new module inside 'login/login.ctrl.js':

'use strict';

import angular from 'angular';

angular.module('ctrlsModule', [])
    .controller('LoginCtrl', function () {

    });

Add the newly created module as a dependency of your main 'app' module:

'use strict';

import angular from 'angular';
import uiRouter from 'angular-ui-router';
...
import './login/login.ctrl.js';

angular.module('app', [uiRouter, 'ctrlsModule', ...])
    .config(function ($stateProvider, $urlRouterProvider) {
        $stateProvider
             .state('login', {
                url: '/login',
                templateUrl: '...', 
                controller: 'LoginCtrl',
                controllerAs: 'login' 
            });
    });

Although I haven't tested the code myself, I hope this clarifies the solution. Regarding your second question, controllerAs in ES6 should function similarly to ES5.

Implementing ES6 import syntax in Angular 1.5 application alongside UI Router

Answer №1

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