What you need to know

to get started with

Angular

Hi Y’all, I am Sajeetharan Sinnathurai

- Microsoft's Most Valuable Professional (Developer Technologies).

- Among 10 Top Contributors in the world for #Angular #cosmosdb in Stackoverflow.

- Senior Tech Lead at 99X Technology.

- Angular,BigData Enthusiast and OpenSource contributor.

- Founder, Stackoverflowers-SriLanka

@kokkisajee

sajeetharan

1749403/sajeetharan

A small story !

What the heck is Angular?

To save your day

10,813

Typescript

Javascript + Types

Typed JavaScript with #TypeScript

Classes

Types

Interfaces

Private methods

class Person {
    private name: string;
    private age: number;
    private salary: number;

    constructor(name: string, age: number, salary: number) {
        this.name = name;
        this.age = age;
        this.salary = salary;
    }
    
    toString(): string {
        return `${this.name} (${this.age}) (${this.salary})`;
    }
}

Angular CLI

Webpack

. Wraps Webpack

. Simple to configure

. Handy commands for generating classes, components …

. Cannot do advance configurations

. A bit slow

.Details configuration

.Faster and customizable

.Less buggy

.Understand workflow better

.For curios/expert users

.A lot of stuff to manage

Let’s start

Requirements

Linux, MacOS or Windows
Node 6.9.0 or higher, with NPM 3 or higher.
Editor: Visual Studio Code

Angular CLI

npm install -g @angular/cli

Install:

Generate a our first app:

ng new beerApp --routing --style=scss
cd beerApp
npm start

Angular App Structure

Application Source

Our application is divided in two parts. -Application itself & Application bootstrap

Angular App

Our modules, routes, components & services live here.

Angular Boostrap

We bootstrap our app depending on what platform were developing for, and add any required polyfills & vendors.

Configuration

Typescript config, npm packages, scripts, webpack config, express server, and so on...

Angular App Hierarchy

Main App

Main Module

Components

Services, Pipes, Classes

Child Module.

@NgModule

import {BrowserModule} from '@angular/platform-browser';
import {NgModule} from '@angular/core';
import {FormsModule} from '@angular/forms';
import {HttpModule} from '@angular/http';

import {AppComponent} from './app.component';
import { HomeComponent } from './home/home.component';
import {AppRoutingModule} from "./app-routing.module";

@NgModule({
    declarations: [
        AppComponent,
        HomeComponent
    ],
    imports: [
        BrowserModule,
        FormsModule,
        HttpModule,
        AppRoutingModule
    ],
    providers: [/**DataService, UserService**/],
    bootstrap: [AppComponent]
})
export class AppModule {
}

Help organize an application into cohesive blocks of functionality.

This is Angular

The rest is a standard JS/Typescript class

@Component

import {Component, OnInit} from '@angular/core';
import {Router} from "@angular/router";
import {UserService} from "../shared/services/user.service";

@Component({
    selector: 'app-login',
    templateUrl: './login.component.html',
    styleUrls: ['./login.component.scss']
})

export class LoginComponent implements OnInit {

    constructor(private us:UserService, private route: Router) {
    }

    ngOnInit() {
    }

    login() {
        this.us.login();
    }

    logout() {
        this.us.logout();
    }
}

Components are the most basic building block of an UI in an Angular application

Decorator

Annotate this is a Angular component

Angular Injects for us every dependency

Create a component

ng g c home

ng generate component home

Using Angular CLI

Short version of the above

What we get:

Template HTML, the component view
SCSS/CSS a style file
SPEC.TS unit test for the component
TS the main Typescript file*

*Only this file is mandatory for creating a component

Use a component

A component can be used inside another component using its meta data selector

import {Component, OnInit} from '@angular/core';
import {Http, Headers} from "@angular/http";

@Component({
    selector: 'app-home',
    templateUrl: './home.component.html',
    styleUrls: ['./home.component.scss']
})
export class HomeComponent implements OnInit {

    constructor(private http: Http) {
    }

    ngOnInit() {

    }
}

home.component.ts

app.component.html

<h1>
 App Works!!
</h1>

<app-home></app-home>

Let's add some style

Open index.html and add the following css link in the head section:

<link rel="stylesheet" 
href="https://cdnjs.cloudflare.com/ajax/libs/materialize/0.98.1/css/materialize.min.css">

Set Routing

Tell Angular which component to load when navigating

Open app-routing.module.ts

import {NgModule} from '@angular/core';
import {Routes, RouterModule} from '@angular/router';
import {HomeComponent} from "./home/home.component";

const routes: Routes = [
    {path: 'home', component: HomeComponent},
];

@NgModule({
    imports: [RouterModule.forRoot(routes)],
    exports: [RouterModule]
})
export class AppRoutingModule {
}

Tell to load HomeComponent when navigating in the browser domain.com/home

We keep adding routes for each components we want to navigate

Add a navigation bar

Create a set of links to navigate the app sections. Replace the content of app.component.html with:

<nav>
    <div class="nav-wrapper">
        <a href="#" class="brand-logo">Logo</a>
        <ul id="nav-mobile" class="right hide-on-med-and-down">
            <li><a [routerLink]="['/home']">Home</a></li>
            <li><a href="">Search Beers</a></li>
            <li><a href="">Login</a></li>
        </ul>
    </div>
</nav>

<div class="container">
    <router-outlet></router-outlet>
</div>

Tell to Angular where to display the content when navigating between components

This is a Directive to link to specific parts of your app.

Home Component

Request to the server

home.component.ts

import { Component, OnInit } from '@angular/core';
import { HttpClient, HttpHeaders } from '@angular/common/http';
import { Beer } from '../models/beer';

@Component({
    selector: 'app-home',
    templateUrl: './home.component.html',
    styleUrls: ['./home.component.scss']
})

export class HomeComponent implements OnInit {

    beer: Beer;

    constructor(private http: HttpClient) {
    }

    ngOnInit() {
        const _options = { headers: new HttpHeaders({ 'Content-Type': 'application/json' }) };
        this.http.get('/api/v2/beer/random?key=a81493ef1e81335e3dc2fc1d5e394053&hasLabels=Y', _options).subscribe(
            (response: any) => {
                const json = response;
                this.beer = new Beer();
                this.beer.name = json.data.nameDisplay;
                this.beer.description = json.data.style.description;
                this.beer.image = json.data.labels.medium;

            }
        );
    }
}

Home Component

Display a random beer and set a button to change beer

home.component.html

<div class="col s12 m7">
    <h4 class="header">A Random Beer</h4>
    <div class="card horizontal">
        <div class="card-image">
            <img [src]="data.image">
        </div>
        <div class="card-stacked">
            <div class="card-content">
                <p>{{ data.description }}</p>
            </div>
            <div class="card-action">
                <a href="#">{{ data.name }}</a>
            </div>
        </div>
    </div>
</div>

String interpolation

Property binding

CORS fix

proxy.json

{
    "/api": {
        "target": "http://api.brewerydb.com",
        "secure": false,
        "changeOrigin": true,
        "logLevel": "debug",
        "pathRewrite": {
            "^/api": "/"
        }
    }
}

Launch the cli with the following

ng serve --proxy-config=proxy.conf.json

Hope things go smoothly...

We should see

Otherwise...

Data Binding

Search Beer Component

ng g c search-beer

End Point

/api/v2/search?key=a81493ef1e81335e3dc2fc1d5e394053&type=beer

Search for beers using a input field and list them

Search Beer Component

search-beer.component.ts

import { Component, OnInit } from '@angular/core';
import { HttpClient, HttpHeaders } from '@angular/common/http';
import { FormControl } from '@angular/forms';
import { HttpClientModule } from '@angular/common/http';
import { switchMap } from 'rxjs/operators';
import { Beer } from '../models/beer';
@Component({
    selector: 'app-search-beer',
    templateUrl: './search-beer.component.html',
    styleUrls: ['./search-beer.component.scss']
})
export class SearchBeerComponent implements OnInit {

    termInput = new FormControl();
    beers: Beer[] = [];
    constructor(private http: HttpClient) {
    }

    ngOnInit() {
        this.termInput.valueChanges.pipe(term => {
            return this.search(term);
        }).subscribe((res: any) => {
            this.beers = res.data;
        });
    }

    search(term) {
        return this.http.get(`/api/v2/search?key=a81493ef1e81335e3dc2fc1d5e394053&type=beer&q=${term}`);
    }

    onKey(value) {
        console.log(value);
    }
}

Search Beer Component

Next steps:

- Display a list of beers

- Search with the API

- Create a reusable component

Q/A

Want some stickers?

Where to go from here?

- Rate my session

https://www.rateevent.com/speeches/SCAAA703

- Show me the code

https://github.com/sajeetharan/Angular-Workshop-UCSC

- Build your first application

- Tweet @kookisajee

- Join Stackoverflowers-SriLanka

Everything you need to know to get started with Angular

By Sajeetharan Sinnathurai

Everything you need to know to get started with Angular

Sajeetharan Sinnathurai

With over 13 years of experience in the IT industry, Sajeetharan is a Cloud Solution Architect, an enthusiast in Cloud and Opensource.He currently works at Microsoft as a Senior Program Manager in the CosmosDB team

10,813

Application Source

Angular App

Angular Boostrap

Configuration

Main App

Main Module

Components

Services, Pipes, Classes

Child Module.

Everything you need to know to get started with Angular

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