AngularJS

Build a basic angular 2 application with VS Code





As a little side project I have been working on I wanted to build a very basic Angular2 Application, it doesn’t do much other than display a heading and hyperlink to the source code. What I wanted to determine is what the detail & steps required create a basic Angular2 application architecture. I wanted to do this, basically to understand what the benefits are of using one of the many starter projects available.

The aim of this article is to discuss all the core components that make up a basic Angular2 application to give you an understanding of all the plumbing involved.

This tutorial was entirely developed making use of Visual Studio code,  but you can develop this using any texteditor like Sublime, Atom or even just Gedit. We are going to focus on buidling an application making use of the Terminal and simple text editor.

All source code on GitHub

Create Application folder

Open your TextEditor or IDE of choice and create a folder for application

 

Then initialise the application using npm init

Then answer a few basic question about the application you intend to build.

This will create your initial package.json file for your application which we will be using and adding too as we build the application further.

Install all angular2 Dependencies

There are two methods you can add dependencies to your project and there are also two types of dependencies.

Dependencies
Are required to run the application in a production environment.

DevDependencies
Are only required by during development or compilation of the application.

To add dependencies to your application you can either edit the package.json file by adding the dependencies you require as below and the type npm install





The other method is to use the terminal and type npm install [packagename] --save for a dependency or npm install [package name] --save-dev for a development dependencies.

Then you can do npm install to install them all to your project.

Install your dependencies
Install your Development dependencies
 

Create Index.html

We need to create the entry point for our application, which is essentially a very simple HTML page. However this file will reference a number of scripts, CSS files and also have a container for a our angular module we will be creating shortly.

 

Create StyleSheet

We’ll go ahead and create a really simple stylesheet for our application and add some styles

Add the following styles to it

 

Create app folder

A convention used in most Angular2 projects to is create an app folder that will be used to contain all your angular component files. Create this folder and change into it.

Create the application module

All Angular 2 applications require at least 1 module.  This will bethe root component of what will become a tree of nested components as the application evolves. You can create the file in the terminal window by using

This will create a TypeScript file that we will the following code too.

We have created a very simple Angular2 component that does not do very much at the moment other than create our AppModule.

Create main.ts

We also need to create a main.ts file that is responsible for compiling the application with the JIT compiler and bootstraps the application to run in the browser.

Add the following code to it

Create an Example Component

We will now also go ahead and create another Angular2 Module that our AppModule make use of the create our really simple application.

go ahead and add the following code to the file




Update the AppModule

We’ll now update our AppModule with some code in order to make it display our Example.Component we created.

We now almost ready to run our application.  All we need to do now is create two new files in our root directory

And Add the following code to it

The presence of a tsconfig.json file in a directory indicates that the directory is the root of a TypeScript project. The tsconfig.json file specifies the root files and the compiler options required to compile the project. A project is compiled in one of the following ways:

Using tsconfig.json
  • By invoking tsc with no input files, in which case the compiler searches for the tsconfig.json file starting in the current directory and continuing up the parent directory chain.
  • By invoking tsc with no input files and a --project (or just -p) command line option that specifies the path of a directory containing a tsconfig.json file, or a path to a valid .json file containing the configurations.

Read More about  TSConfig >>

Using systemjs to compile application

We will be using to SystemJS to compile and run our application.

Read More about SystemJS >>

Add starting point for our application

We now need to go add detail to package.json file which provides npm with instructions on how to start our application. Add the following the “scripts” section of your package.json file

 

Run the Application

We can now run the application to see it in all its glory

Your browser should launch and you should see the new page

Gary Woodfine

Helps businesses by improving their technical proficiencies and eliminating waste from the software development pipelines. A unique background as business owner, marketing, software development and business development ensures that he can offer the optimum business consultancy services across a wide spectrum of business challenges.

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