Intro. of Angular Routing and Forms

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# Angular Routing
## Overview
Angular Routing allows navigation between different components in a Single Page Application (SPA) without reloading the page.
It maps URL paths to components and dynamically loads them inside the application.
---
## Key Concepts
### Routes
Routes define the relationship between a URL path and a component.
Example:
const routes: Routes = [
{ path: 'home', component: HomeComponent },
{ path: 'about', component: AboutComponent }
];
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### Router Outlet
`<router-outlet>` is a directive that acts as a placeholder where routed components are displayed.
Example:
<router-outlet></router-outlet>
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### RouterLink
Used in HTML to navigate between routes.
Example:
<a routerLink="/home">Home</a>
<a routerLink="/about">About</a>
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### Programmatic Navigation
You can navigate using the Router service.
Example:
constructor(private router: Router) {}
goHome() {
this.router.navigate(['/home']);
}
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## Steps to Implement Routing
1. Install Angular Router (included in Angular CLI projects)
2. Define routes in a routes file
3. Import RouterModule
4. Use `<router-outlet>` in the main template
5. Add navigation links using `routerLink`
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# Angular Forms
## Overview
Angular Forms are used to capture user input and validate data in web applications.
Angular provides two types of forms:
- Template-driven forms
- Reactive forms
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## Template-Driven Forms
Template-driven forms rely mainly on HTML templates and Angular directives.
Example:
<form #userForm="ngForm">
<input name="username" ngModel required>
<button type="submit">Submit</button>
</form>
Features:
- Easy to use
- Suitable for simple forms
- Uses `ngModel` directive
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## Reactive Forms
Reactive forms are defined in TypeScript using FormControl and FormGroup.
Example:
import { FormGroup, FormControl } from '@angular/forms';
profileForm = new FormGroup({
name: new FormControl(''),
email: new FormControl('')
});
HTML:
<form [formGroup]="profileForm">
<input formControlName="name">
<input formControlName="email">
</form>
Features:
- More control
- Better for complex forms
- Easy validation and testing
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## Form Validation
Angular provides built-in validation such as:
- required
- minlength
- maxlength
- pattern
Example:
<input formControlName="email" required>
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