Creating Your App Edit Page


Ember CLI, Ember's command line interface, provides a standard project structure, a set of development tools, and an addon system. This allows Ember developers to focus on building apps rather than building the support structures that make them run. From your command line, a quick ember --help shows the commands Ember CLI provides. For more information on a specific command, type ember help <command-name>.

Creating a New App

To create a new project using Ember CLI, use the new command. In preparation for the tutorial in the next section, you can make an app called super-rentals.

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ember new super-rentals

Directory Structure

The new command generates a project structure with the following files and directories:

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|--app
|--bower_components
|--config
|--dist
|--node_modules
|--public
|--tests
|--tmp
|--vendor

bower.json
ember-cli-build.js
package.json
README.md
testem.js

Let's take a look at the folders and files Ember CLI generates.

app: This is where folders and files for models, components, routes, templates and styles are stored. The majority of your coding on an Ember project happens in this folder.

bower_components / bower.json: Bower is a dependency management tool. It is used in Ember CLI to manage front-end plugins and component dependencies (HTML, CSS, JavaScript, etc). All Bower components are installed in the bower_components directory. If we open bower.json, we see the list of dependencies that are installed automatically including Ember, Ember CLI Shims, and QUnit (for testing). If we add additional front-end dependencies, such as Bootstrap, we will see them listed here, and added to the bower_components directory.

config: The config directory contains the environment.js where you can configure settings for your app.

dist: When we build our app for deployment, the output files will be created here.

node_modules / package.json: This directory and file are from npm. npm is the package manager for Node.js. Ember is built with Node and uses a variety of Node.js modules for operation. The package.json file maintains the list of current npm dependencies for the app. Any Ember CLI add-ons you install will also show up here. Packages listed in package.json are installed in the node_modules directory.

public: This directory contains assets such as images and fonts.

vendor: This directory is where front-end dependencies (such as JavaScript or CSS) that are not managed by Bower go.

tests / testem.js: Automated tests for our app go in the tests folder, and Ember CLI's test runner testem is configured in testem.js.

tmp: Ember CLI temporary files live here.

ember-cli-build.js: This file describes how Ember CLI should build our app.

ES6 Modules

If you take a look at app/router.js, you'll notice some syntax that may be unfamiliar to you.

app/router.js
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import Ember from 'ember';
import config from './config/environment';

const Router = Ember.Router.extend({
  location: config.locationType,
  rootURL: config.rootURL
});

Router.map(function() {
});

export default Router;

Ember CLI uses ECMAScript 2015 (ES2015 for short or previously known as ES6) modules to organize application code. For example, the line import Ember from 'ember'; gives us access to the actual Ember.js library as the variable Ember. And the import config from './config/environment'; line gives us access to our app's configuration data as the variable config. const is a way to declare a read-only variable, as to make sure it is not accidentally reassigned elsewhere. At the end of the file, export default Router; makes the Router variable defined in this file available to other parts of the app.

Upgrading Ember

Before continuing to the tutorial, make sure that you have the most recent versions of Ember and Ember Data installed. If the version of ember in bower.json is lower than the version number in the upper-left corner of these Guides, update the version number in bower.json and then run bower install. Similarly, if the version of ember-data in package.json is lower, update the version number and then run npm install.

The Development Server

Once we have a new project in place, we can confirm everything is working by starting the Ember development server:

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ember server

or, for short:

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ember s

If we navigate to http://localhost:4200, we'll see the default welcome screen. Once we add our own app/templates/application.hbs file, the welcome screen will be replaced with our own content.

default welcome screen