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https://github.com/rodrigokamada/angular-reactive-form-validation
Application example built with Angular 14 and creating and validating a reactive form.
https://github.com/rodrigokamada/angular-reactive-form-validation
angular beginners devcommunity form forms ghactions ghpages hacktoberfest reactiveforms stackblitz tutorial validation
Last synced: 2 months ago
JSON representation
Application example built with Angular 14 and creating and validating a reactive form.
- Host: GitHub
- URL: https://github.com/rodrigokamada/angular-reactive-form-validation
- Owner: rodrigokamada
- License: mit
- Created: 2022-03-18T15:02:48.000Z (almost 3 years ago)
- Default Branch: main
- Last Pushed: 2022-08-08T21:29:53.000Z (over 2 years ago)
- Last Synced: 2024-10-13T15:09:11.823Z (3 months ago)
- Topics: angular, beginners, devcommunity, form, forms, ghactions, ghpages, hacktoberfest, reactiveforms, stackblitz, tutorial, validation
- Language: TypeScript
- Homepage: https://rodrigokamada.github.io/angular-reactive-form-validation/
- Size: 1.42 MB
- Stars: 3
- Watchers: 2
- Forks: 3
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- Funding: .github/FUNDING.yml
- License: LICENSE.md
Awesome Lists containing this project
README
# Angular Reactive Form Validation
Application example built with [Angular](https://angular.io/) 14 and creating and validating a reactive form.
This tutorial was posted on my [blog](https://rodrigo.kamada.com.br/blog/criando-e-validando-um-formulario-reactive-em-uma-aplicacao-angular) in portuguese and on the [DEV Community](https://dev.to/rodrigokamada/creating-and-validating-a-reactive-form-to-an-angular-application-1j0c) in english.
[](https://rodrigo.kamada.com.br)
[](https://www.linkedin.com/in/rodrigokamada)
[](https://twitter.com/rodrigokamada)
## Prerequisites
Before you start, you need to install and configure the tools:
* [git](https://git-scm.com/)
* [Node.js and npm](https://nodejs.org/)
* [Angular CLI](https://angular.io/cli)
* IDE (e.g. [Visual Studio Code](https://code.visualstudio.com/) or [WebStorm](https://www.jetbrains.com/webstorm/))
## Getting started
### Create the Angular application
**1.** Let's create the application with the Angular base structure using the `@angular/cli` with the route file and the SCSS style format.
```powershell
ng new angular-reactive-form-validation --routing true --style scss
CREATE angular-reactive-form-validation/README.md (1083 bytes)
CREATE angular-reactive-form-validation/.editorconfig (274 bytes)
CREATE angular-reactive-form-validation/.gitignore (548 bytes)
CREATE angular-reactive-form-validation/angular.json (3363 bytes)
CREATE angular-reactive-form-validation/package.json (1095 bytes)
CREATE angular-reactive-form-validation/tsconfig.json (863 bytes)
CREATE angular-reactive-form-validation/.browserslistrc (600 bytes)
CREATE angular-reactive-form-validation/karma.conf.js (1449 bytes)
CREATE angular-reactive-form-validation/tsconfig.app.json (287 bytes)
CREATE angular-reactive-form-validation/tsconfig.spec.json (333 bytes)
CREATE angular-reactive-form-validation/.vscode/extensions.json (130 bytes)
CREATE angular-reactive-form-validation/.vscode/launch.json (474 bytes)
CREATE angular-reactive-form-validation/.vscode/tasks.json (938 bytes)
CREATE angular-reactive-form-validation/src/favicon.ico (948 bytes)
CREATE angular-reactive-form-validation/src/index.html (315 bytes)
CREATE angular-reactive-form-validation/src/main.ts (372 bytes)
CREATE angular-reactive-form-validation/src/polyfills.ts (2338 bytes)
CREATE angular-reactive-form-validation/src/styles.scss (80 bytes)
CREATE angular-reactive-form-validation/src/test.ts (745 bytes)
CREATE angular-reactive-form-validation/src/assets/.gitkeep (0 bytes)
CREATE angular-reactive-form-validation/src/environments/environment.prod.ts (51 bytes)
CREATE angular-reactive-form-validation/src/environments/environment.ts (658 bytes)
CREATE angular-reactive-form-validation/src/app/app-routing.module.ts (245 bytes)
CREATE angular-reactive-form-validation/src/app/app.module.ts (393 bytes)
CREATE angular-reactive-form-validation/src/app/app.component.scss (0 bytes)
CREATE angular-reactive-form-validation/src/app/app.component.html (23364 bytes)
CREATE angular-reactive-form-validation/src/app/app.component.spec.ts (1151 bytes)
CREATE angular-reactive-form-validation/src/app/app.component.ts (237 bytes)
✔ Packages installed successfully.
Successfully initialized git.
```
**2.** Install and configure the Bootstrap CSS framework. Do steps 2 and 3 of the post *[Adding the Bootstrap CSS framework to an Angular application](https://github.com/rodrigokamada/angular-bootstrap)*.
**3.** Let's create a custom validator for the email field. Create the `EmailValidatorDirective` directive.
```powershell
ng generate directive email-validator --skip-tests=true
CREATE src/app/email-validator.directive.ts (157 bytes)
UPDATE src/app/app.module.ts (592 bytes)
```
**4.** Change the `src/app/email-validator.directive.ts` file. Create the `emailValidator` function and the `EmailValidatorDirective` class as below.
```typescript
import { Directive } from '@angular/core';
import { NG_VALIDATORS, AbstractControl, Validator, ValidationErrors, ValidatorFn } from '@angular/forms';
export function emailValidator(): ValidatorFn {
const EMAIL_REGEXP = /^(([^<>()\[\]\.,;:\s@\"]+(\.[^<>()\[\]\.,;:\s@\"]+)*)|(\".+\"))@(([^<>()[\]\.,;:\s@\"]+\.)+[^<>()[\]\.,;:\s@\"]{2,})$/i;
return (control: AbstractControl): ValidationErrors | null => {
const isValid = EMAIL_REGEXP.test(control.value);
if (isValid) {
return null;
} else {
return {
emailValidator: {
valid: false,
},
};
}
};
}
@Directive({
selector: '[appEmailValidator]',
providers: [{
provide: NG_VALIDATORS,
useExisting: EmailValidatorDirective,
multi: true,
}],
})
export class EmailValidatorDirective implements Validator {
constructor() {
}
public validate(control: AbstractControl): ValidationErrors | null {
return emailValidator()(control);
}
}
```
**5.** Change the `src/app/app.component.ts` file. Import the `NgForm` service, create the `IUser` interface and create the `validate` function as below.
```typescript
import { Component, OnInit } from '@angular/core';
import { FormControl, FormGroup, Validators } from '@angular/forms';
import { emailValidator } from './email-validator.directive';
interface IUser {
name: string;
nickname: string;
email: string;
password: string;
showPassword: boolean;
}
@Component({
selector: 'app-root',
templateUrl: './app.component.html',
styleUrls: ['./app.component.scss'],
})
export class AppComponent implements OnInit {
reactiveForm!: FormGroup;
user: IUser;
constructor() {
this.user = {} as IUser;
}
ngOnInit(): void {
this.reactiveForm = new FormGroup({
name: new FormControl(this.user.name, [
Validators.required,
Validators.minLength(1),
Validators.maxLength(250),
]),
nickname: new FormControl(this.user.nickname, [
Validators.maxLength(10),
]),
email: new FormControl(this.user.email, [
Validators.required,
Validators.minLength(1),
Validators.maxLength(250),
emailValidator(),
]),
password: new FormControl(this.user.password, [
Validators.required,
Validators.minLength(15),
]),
});
}
get name() {
return this.reactiveForm.get('name')!;
}
get nickname() {
return this.reactiveForm.get('nickname')!;
}
get email() {
return this.reactiveForm.get('email')!;
}
get password() {
return this.reactiveForm.get('password')!;
}
public validate(): void {
if (this.reactiveForm.invalid) {
for (const control of Object.keys(this.reactiveForm.controls)) {
this.reactiveForm.controls[control].markAsTouched();
}
return;
}
this.user = this.reactiveForm.value;
console.info('Name:', this.user.name);
console.info('Nickname:', this.user.nickname);
console.info('Email:', this.user.email);
console.info('Password:', this.user.password);
}
}
```
**6.** Change the `src/app/app.component.html` file. Add the form as below.
```html
Angular Reactive Form Validation
Name:
This field is required.
This field must have at least 1 character.
This field must have at most 250 characters.
Nickname:
This field must have at most 10 characters.
Email:
This field is required.
This field must have at least 1 character.
This field must have at most 250 characters.
Invalid email format.
Password:
This field is required.
This field must have at least 15 characters.
Validate
```
**7.** Change the `src/app/app.module.ts` file. Import the `ReactiveFormsModule` module and the `EmailValidatorDirective` directive as below.
```typescript
import { ReactiveFormsModule } from '@angular/forms';
import { EmailValidatorDirective } from './email-validator.directive';
declarations: [
AppComponent,
EmailValidatorDirective,
],
imports: [
BrowserModule,
ReactiveFormsModule,
AppRoutingModule,
],
```
**8.** Run the application with the command below.
```powershell
npm start
> [email protected] start
> ng serve
✔ Browser application bundle generation complete.
Initial Chunk Files | Names | Raw Size
vendor.js | vendor | 2.25 MB |
styles.css, styles.js | styles | 454.68 kB |
polyfills.js | polyfills | 294.84 kB |
scripts.js | scripts | 76.33 kB |
main.js | main | 27.76 kB |
runtime.js | runtime | 6.56 kB |
| Initial Total | 3.09 MB
Build at: 2022-03-21T00:40:49.519Z - Hash: af669f909d9510f8 - Time: 3254ms
** Angular Live Development Server is listening on localhost:4200, open your browser on http://localhost:4200/ **
✔ Compiled successfully.
```
**9.** Ready! Access the URL `http://localhost:4200/` and check if the application is working. See the application working on [GitHub Pages](https://rodrigokamada.github.io/angular-reactive-form-validation/) and [Stackblitz](https://stackblitz.com/edit/angular14-reactive-form-validation).
## Cloning the application
**1.** Clone the repository.
```powershell
git clone [email protected]:rodrigokamada/angular-reactive-form-validation.git
```
**2.** Install the dependencies.
```powershell
npm ci
```
**3.** Run the application.
```powershell
npm start
```