Angular is a powerful front-end framework for building dynamic web applications. Whether you're a seasoned Angular developer or just getting started, having a handy cheat sheet can be a valuable resource for speeding up development and solving common tasks. In this Angular cheat sheet, we'll cover key concepts, directives, and tips to help you work efficiently with Angular.
Getting Started with Angular
Creating a New Angular Project
ng new my-app
Starting the Development Server
ng serve
Generating a New Component
ng generate component my-component
Angular Basics
Interpolation (Binding Values)
{{ variableName }}
Property Binding
[src]="imageUrl"
Event Binding
(click)="methodName()"
Two-Way Data Binding
[(ngModel)]="propertyName"
Structural Directives
*ngIf
<div *ngIf="showElement">Visible when showElement is true</div>
*ngFor
<div *ngFor="let item of items">{{ item }}</div>
*ngSwitch
<div [ngSwitch]="value">
<div *ngSwitchCase="'case1'">Content for case 1</div>
<div *ngSwitchCase="'case2'">Content for case 2</div>
<div *ngSwitchDefault>Default content</div>
</div>
Component Interaction
Input Binding
<app-child [inputProperty]="parentProperty"></app-child>
Output Binding
<app-child (outputEvent)="parentMethod($event)"></app-child>
Forms
Template-Driven Forms
<form #form="ngForm" (ngSubmit)="submitForm(form)">
<input type="text" name="name" ngModel>
<button type="submit">Submit</button>
</form>
Reactive Forms
<form [formGroup]="formGroup" (ngSubmit)="submitForm()">
<input type="text" formControlName="name">
<button type="submit">Submit</button>
</form>
HTTP Requests
Import HttpClientModule
import { HttpClientModule } from '@angular/common/http';
Making a GET Request
import { HttpClient } from '@angular/common/http';
constructor(private http: HttpClient) {}
this.http.get('https://api.example.com/data').subscribe(data => {
console.log(data);
});
Routing
Configuring Routes
const routes: Routes = [
{ path: 'home', component: HomeComponent },
{ path: 'about', component: AboutComponent },
{ path: '', redirectTo: '/home', pathMatch: 'full' },
];
Router Outlet
<router-outlet></router-outlet>
Services
Creating a Service
ng generate service my-service
Injecting a Service
constructor(private myService: MyService) {}
Lifecycle Hooks
ngOnInit
ngOnInit() {
// Initialization logic here
}
ngOnChanges
ngOnChanges(changes: SimpleChanges) {
// Handle changes here
}
Tips and Tricks
- Use the Angular CLI for code generation and project setup.
- Leverage Angular CLI's powerful commands like
ng generate component
andng generate service
. - Utilize Angular's dependency injection system for managing services.
- Follow best practices for component and module organization.
- Take advantage of Angular's built-in directives for data binding and DOM manipulation.
- Regularly check Angular's official documentation and community resources for updates and solutions to common issues.
This Angular cheat sheet provides a quick reference guide to some of the most commonly used features and concepts in Angular development. Keep it handy as you work on your Angular projects, and don't hesitate to explore the official Angular documentation and community resources for more in-depth information and tutorials. Happy coding!
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