Angular 6 Forms Validation Example - [Required, Email, URL, Dropdown and Min-Max min-length] - Interview Questions Angular, JavaScript, Java, PHP, SQL, C#, Vue, NodeJs, ReactJs

In this article, I will show you how to setup form validation in Angular 6. Also, I am using a simple registration form with standard fields –

1. Name

2. Email

3. Gender

4. Country

5. Site URL

6. Password

All fields are required, plus the email field must be a valid email address, site URL field must be a valid URL and the password field must have a min-length of 6.

Steps involved as following –

1. Create a project with the help of CLI command – ng g new Project_Name

2. Go to the created project directory

3. Create customer components with the help of CLI command – ng g component comp_name

4. Import the FormsModule, RouterModule, CustomerComponent, routing for navigating add customer page in the NgModule.

5. Finally come to app.module.ts

6. Result

The following Examples as–

Create a project

ng g new ng6FormValidation

Create customer components –

customer.component.ts –

import { Component, OnInit } from '@angular/core';

@Component({

selector: 'app-customer',

templateUrl: './customer.component.html',

styleUrls: ['./customer.component.css']

})

export class CustomerComponent implements OnInit {

model: any = {};

countries : any;

constructor() {

}

ngOnInit() {

//Get country list.

this.countries =[

{"id" :1, "name": "India", "code":"IN"},

{"id" :2, "name": "Nepal", "code":"NP"},

{"id" :3, "name": "United Arab Emirates", "code": "AE"},

{"id" :4, "name": "United Kingdom", "code": "GB"},

{"id" :5, "name": "United States", "code": "US"},

{"id" :6, "name": "Australia", "code": "AU"},

{"id" :7, "name": "Austria", "code": "AT"},

{"id" :8, "name": "Canada", "code": "CA"},

{"id" :9, "name": "China", "code": "CN"},

];

//Default selected country Id.

//this.model.country = 5;

}

public onSubmitCustomer() {

alert('Your information has been submitted successfully. :-)\n\n' + JSON.stringify(this.model))

}

And customer.component.html –

<h1>Register Customer</h1>

<hr>

<div *ngIf="name.errors.required">Name is required</div>

</div>

<label for="email"><b>Email</b></label>

<div *ngIf="email.errors.required">Email is required</div>

<div *ngIf="email.errors.email">Email must be a valid email address</div>

</div>

<label for="gender"><b>Gender</b></label>

<option>Female</option>

<option>Other</option>

</select>

<div *ngIf="gender.errors.required">Gender is required</div>

</div>

<br>

<label for="country"><b>Country</b></label>

<option *ngFor="let country of countries" [value]="country.id"> {{country.name}}</option>

</select>

<div *ngIf="country.errors.required">Country is required</div>

</div>

<br>

<div *ngIf="site.errors.required">Site is required</div>

<div *ngIf="site.errors.pattern">Must be a valid site URL</div>

</div>

<label for="psw-repeat"><b>Password</b></label>

<div *ngIf="pwd.errors.required">Password is required</div>

<div *ngIf="pwd.errors.minlength">Password must be at least 6 characters</div>

</div>

<hr>

<p>By creating an account you agree to our <a href="#">Terms & Privacy</a>.</p>

<button type="submit" class="registerbtn">Register</button>

</div>

<p>Already has an account? <a href="#">Sign in</a>.</p>

</div>

</form>

Import the FormsModule, RouterModule, CustomerComponent, routing for navigate add customer page in the NgModule. Now the NgModule looks like.

import { BrowserModule } from '@angular/platform-browser';

import { NgModule } from '@angular/core';

import {FormsModule} from '@angular/forms';

import {RouterModule} from '@angular/router';

import { AppComponent } from './app.component';

import { CustomerComponent } from './customer/customer.component';

@NgModule({

declarations: [

AppComponent,

CustomerComponent

imports: [

BrowserModule,

FormsModule,

RouterModule.forRoot([{

path:'customer-link', component:CustomerComponent }

])

providers: [],

bootstrap: [AppComponent]

})

export class AppModule { }

Result looks like –

Pin it

Anil Singh is an author, tech blogger, and software programmer. Book writing, tech blogging is something do extra and Anil love doing it. For more detail, kindly refer to this link..

My Tech Blog - https://www.code-sample.com/
My Books - Book 1 and Book 2