Angular 2 GetStarted
Angular 2 hello world
This entry is from Angular 2 Tutorial
Use same project structure and the way to run.
Follow base and make it simple to understand.
- Source code base is Angular 2 Tutorial
- Use one Component
- Use Template HTML
- Use Template CSS
- TypeScript
- Value Bind
Sample
Project
helloangular2 |- app | |- styles | | |- app.css | |- template | | |- app.html | |- app.component.ts | |- app.module.ts | |- main.ts |- index.html |- package.json |- systemjs.config.js |- tsconfig.json
I use WebStrom as IDE.
Preparation for Angular2
Following files are preparation
| File | Description |
|---|---|
| package.json | node project dependencies and project settings |
| systemjs.config.js | System configuration for Angular samples. Loader settings |
| tsconfig.json | TypeScript configuration file |
package.json
{
"name": "helloangular2",
"version": "0.0.1",
"scripts": {
"start": "tsc && concurrently \"tsc -w\" \"lite-server\" ",
"lite": "lite-server",
"tsc": "tsc",
"tsc:w": "tsc -w"
},
"licenses": [
{
"type": "MIT",
"url": "https://github.com/angular/angular.io/blob/master/LICENSE"
}
],
"dependencies": {
"@angular/common": "~2.1.1",
"@angular/compiler": "~2.1.1",
"@angular/core": "~2.1.1",
"@angular/forms": "~2.1.1",
"@angular/http": "~2.1.1",
"@angular/platform-browser": "~2.1.1",
"@angular/platform-browser-dynamic": "~2.1.1",
"@angular/router": "~3.1.1",
"@angular/upgrade": "~2.1.1",
"angular-in-memory-web-api": "~0.1.13",
"core-js": "^2.4.1",
"reflect-metadata": "^0.1.8",
"rxjs": "5.0.0-beta.12",
"systemjs": "0.19.39",
"zone.js": "^0.6.25"
},
"devDependencies": {
"@types/core-js": "^0.9.34",
"@types/node": "^6.0.45",
"concurrently": "^3.0.0",
"lite-server": "^2.2.2",
"typescript": "^2.0.3"
}
}
Add angualr2 library and several dependencies including typescript.
To install them, type following on your project root
npm install
system.config.js
(function (global) {
System.config({
paths: {
// paths serve as alias
'npm:': 'node_modules/'
},
// map tells the System loader where to look for things
map: {
// our app is within the app folder
app: 'app',
// angular bundles
'@angular/core': 'npm:@angular/core/bundles/core.umd.js',
'@angular/common': 'npm:@angular/common/bundles/common.umd.js',
'@angular/compiler': 'npm:@angular/compiler/bundles/compiler.umd.js',
'@angular/platform-browser': 'npm:@angular/platform-browser/bundles/platform-browser.umd.js',
'@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic/bundles/platform-browser-dynamic.umd.js',
'@angular/http': 'npm:@angular/http/bundles/http.umd.js',
'@angular/router': 'npm:@angular/router/bundles/router.umd.js',
'@angular/forms': 'npm:@angular/forms/bundles/forms.umd.js',
'@angular/upgrade': 'npm:@angular/upgrade/bundles/upgrade.umd.js',
// other libraries
'rxjs': 'npm:rxjs',
'angular-in-memory-web-api': 'npm:angular-in-memory-web-api/bundles/in-memory-web-api.umd.js'
},
// packages tells the System loader how to load when no filename and/or no extension
packages: {
app: {
main: './main.js',
defaultExtension: 'js'
},
rxjs: {
defaultExtension: 'js'
}
}
});
})(this);
This is for system loader, and dependencies.
From this, app is defined and main javascript
typeconfig.json
{
"compilerOptions": {
"target": "es5",
"module": "commonjs",
"moduleResolution": "node",
"sourceMap": false,
"emitDecoratorMetadata": true,
"experimentalDecorators": true,
"removeComments": true,
"noImplicitAny": false
}
}
This is typescript compile settings.
Sources
index.html
<html>
<head>
<title>Angular QuickStart</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- 1. Load libraries -->
<!-- Polyfill(s) for older browsers -->
<script src="node_modules/core-js/client/shim.min.js"></script>
<script src="node_modules/zone.js/dist/zone.js"></script>
<script src="node_modules/reflect-metadata/Reflect.js"></script>
<script src="node_modules/systemjs/dist/system.src.js"></script>
<!-- 2. Configure SystemJS -->
<script src="systemjs.config.js"></script>
<script>
System.import('app').catch(function(err){ console.error(err); });
</script>
</head>
<!-- 3. Display the application -->
<body>
<app>Loading...</app>
</body>
</html>
This is entry html. Import dependencies.
Layout is just simple(only one tag under body)
main.ts
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { AppModule } from './app.module';
const platform = platformBrowserDynamic();
platform.bootstrapModule(AppModule);
This is main typescript. This import Module and wrap bootstrap function
app.module.ts
import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
@NgModule({
imports: [ BrowserModule ],
declarations: [ AppComponent ],
bootstrap: [ AppComponent ]
})
export class AppModule { }
This is definition of this application.
@NgModule is key part.
app.compoment.ts
import { Component } from '@angular/core';
@Component({
selector: 'app',
//template: '<h1>Hello Angular App</h1>'
templateUrl: './app/template/app.html',
styleUrls: [ './app/styles/app.css']
})
export class AppComponent {
title = "Test";
}
title variable to import template. This is similar with Angular 1
Templates
template/app.html
<h1>Hello Angular App {{title}}</h1>
This includes variable, this is inserted by AppComponent class.
This style is same as Angular 1.
styles/app.css
h1 {
color: aqua;
}
Run and Result
Type following command on project root
npm start
Compile typescript and js files are generated.
And run lite-server and open default browser, you can see results
