What is the way to access the Ember global variable 'App' within an Ember CLI application?

Question

What is the way to access the Ember global variable 'App' within an Ember CLI application?

As I develop my Ember application with the Ember CLI, I encountered an issue while trying to access the global App variable in order to create and insert a component into my layout. The error message I received was "Uncaught ReferenceError: App is not defined."

How can I resolve this issue?

app.js

import Ember from 'ember';
import Resolver from 'ember/resolver';
import loadInitializers from 'ember/load-initializers';

Ember.MODEL_FACTORY_INJECTIONS = true;

var App = Ember.Application.extend({
  modulePrefix: 'client-web', // TODO: loaded via config
  Resolver: Resolver
});

loadInitializers(App, 'client-web');

export default App;

item-table.js (This serves as a view)

import Ember from 'ember';

export default Ember.View.extend({
    templateName: 'item-table',

    didInsertElement: function() {
        // Inserting other code here

        App.FreestyleChartComponent.create().appendTo($('#wp-chart td')); // This line throws an error.
    }
});

app/components/freestyle-chart.js

import Ember from 'ember';

export default Ember.Component.extend({
    templateName: 'components/freestyle-chart',

    didInsertElement: function() {
        console.log('Successfully inserted the component.');
    }
});

javascript ember.js ember-cli

Answer 1

Answer №1

There are a couple of approaches you can take. The initial method involves manually placing the App in the global scope.

var App = window.App = Ember.Application.extend();

The alternative is to bring the App into your view by importing it:

import App from './path/to/app/file';

The latter option may only work if Ember CLI supports circular references. While the official ES6 spec allows them, not all transpilers do (mine doesn't).

However, I suspect your main concern lies elsewhere. It's generally recommended not to rely on global variables within Ember CLI. Instead of inserting the FreestyleChartComponent directly into the App namespace, consider putting it in a module and importing it like any other module. While global variables can sometimes be unavoidable (I encountered this today), it's best to try and keep their use minimal.

Answer 2

There are a couple of approaches you can take. The initial method involves manually placing the App in the global scope.

var App = window.App = Ember.Application.extend();

The alternative is to bring the App into your view by importing it:

import App from './path/to/app/file';

The latter option may only work if Ember CLI supports circular references. While the official ES6 spec allows them, not all transpilers do (mine doesn't).

However, I suspect your main concern lies elsewhere. It's generally recommended not to rely on global variables within Ember CLI. Instead of inserting the FreestyleChartComponent directly into the App namespace, consider putting it in a module and importing it like any other module. While global variables can sometimes be unavoidable (I encountered this today), it's best to try and keep their use minimal.

Answer 3

Answer №2

While it is generally advised against, accessing your app through the global namespace is a common practice in ember-cli. Your app becomes a global variable, with the name of your app serving as the variable name.

If you navigate to /app/index.html in your ember-cli project, you'll notice a script tag at the bottom that resembles the following...

<script>
  window.YourAppName = require('your-app-name/app')['default'].create(YourAppNameENV.APP);
</script>

In this scenario, YourAppName functions as your globally accessible app.

Answer 4

While it is generally advised against, accessing your app through the global namespace is a common practice in ember-cli. Your app becomes a global variable, with the name of your app serving as the variable name.

If you navigate to /app/index.html in your ember-cli project, you'll notice a script tag at the bottom that resembles the following...

<script>
  window.YourAppName = require('your-app-name/app')['default'].create(YourAppNameENV.APP);
</script>

In this scenario, YourAppName functions as your globally accessible app.

Answer 5

Answer №3

To include the desired component:

import CustomChartComponent from 'your_app_name/your_folder/components/custom-chart';

Answer 6

To include the desired component:

import CustomChartComponent from 'your_app_name/your_folder/components/custom-chart';

Answer 7

Answer №4

Doing this in Ember CLI can be a bit tricky as it prefers you to use the public API and provided components instead of accessing the App instance directly.

While many solutions involve making the App instance global, this particular approach avoids that. Although I haven't tested it myself, I believe this code should do the trick:

appname/utils/application.js

export default {
   instance: null
};

appname/instance-initializers/application.js

import application from 'appname/utils/application';

export default {
  name: 'app-initializer',
  initialize: function (application) {
     application.instance = application;
  }
};

Now

import application from 'appname/utils/application';

and you can access application.instance in any file where you need the application instance.

Answer 8

Doing this in Ember CLI can be a bit tricky as it prefers you to use the public API and provided components instead of accessing the App instance directly.

While many solutions involve making the App instance global, this particular approach avoids that. Although I haven't tested it myself, I believe this code should do the trick:

appname/utils/application.js

export default {
   instance: null
};

appname/instance-initializers/application.js

import application from 'appname/utils/application';

export default {
  name: 'app-initializer',
  initialize: function (application) {
     application.instance = application;
  }
};

Now

import application from 'appname/utils/application';

and you can access application.instance in any file where you need the application instance.

Answer 9

Answer №5

Recently tried with Ember 3.7.

import Application from 'my-app/application';

my-app should be substituted with the actual name of your application (presumably found in package.json).

Answer 10

Recently tried with Ember 3.7.

import Application from 'my-app/application';

my-app should be substituted with the actual name of your application (presumably found in package.json).

What is the way to access the Ember global variable 'App' within an Ember CLI application?

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

Similar questions

Utilize Meteor-tabular to effortlessly export data with convenient HTML5 export buttons

Stuck on AMChart while trying to load data

Elevate the React experience by smoothly sliding a fixed navbar upwards when scrolling down, and elegantly sliding it

Integrate CSS and Javascript Plugins into your Ruby on Rails application

Using AngularJS to handle form data without ng-model

No duplication of Collada material present

When the button is clicked, two forms will be sent simultaneously and the PHP script will be

A JavaScript async function with a nested call inside

Traversing through an array and populating a dropdown menu in Angular

The component's state consistently reverts to its initial state

When a new element is introduced, onmouseenter feature assigns a unique dynamic function variable

Regular expressions tailored for a precise format in JavaScript

Could not locate the express.js file

Form fields generated dynamically by Rails using fields_for method may not be recognized as inputs when using form_tag

Ways to convert a JavaScript object into restful GET parameters in order to append them to the end of an API URL

Is it acceptable to display a collection of components in React 16?

What is the best way to utilize Link navigation in order to navigate away from a blocked route in the latest version of Next.js,

Adjust time according to specified time zone using JavaScript

Creating vibrant row displays in Vue.js: A guide to styling each row uniquely

Verifying the activation status of a button within a Chrome extension