Mobile number validation in Angular 13 | Angular 13 tutorial

Hello All, In this angular 13 tutorial, We will discuss How to implement mobile number validation in angular 13 applications. In the last angular tutorial, We had discussed How to create a search filter functionality in angular applications.

In reactive forms, We need to validate 10 digits mobile numbers. This can be validated using Validators from angular forms. We can validate the mobile number with the help of a regex pattern. Also, If this field is compulsory/required then also we can validate it. So, This validation is covered in this tutorial.

Steps required for mobile number validation in angular 13

• Step1: Create Angular Project
• Step2: Import ReactiveFormsModule & FormsModule
• Step3: Update Template
• Step4: Update TS Code
• Step5: Update SCSS
• Step6: Run & See the Output

Step1: Create angular project

Create a new angular project using the below command.

ng new <APPNAME>



Now, move to our root project directory using the following command

cd <APPNAME>



Open the newly created angular project in Visual Studio Code. Use the following command to open the project.

code .

Step2: Import ReactiveFormsModule & FormsModule

Now, We need to import two modules ReactiveFormsModule & FormsModule from angular forms. We import these modules as follows

Update app.module.ts as shown below

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

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

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


@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
    ReactiveFormsModule,
    FormsModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

Step3: Update Template

Now, We have to update our HTML template. We will use the form element which contains the input field for mobile numbers. Then, We will give the FormGroup name which is a valid name for the form. After that, For every input element, We need to give formControlName. In this example, We are only using the mobile number input field. So, We are using only one formControlName. On the bottom side, We use one button which handles the click event. In this event, We will capture the input field value.

Update the app.component.html as shown below

<form [formGroup]="formGrp" novalidate>
  <div>
    <label>Mobile Number (10 Digit)</label>
    <label class="show-error">*</label><br>
    <input type="tel" formControlName="mobctrl" [(ngModel)]="mobileNumber" placeholder="Please enter mobile number here">

    <div *ngIf="mobno['mobctrl'].touched && mobno['mobctrl'].invalid" class="show-error">
      <div *ngIf="mobno['mobctrl'].errors?.['required'] && mobno['mobctrl'].dirty">Please enter mobile number</div>
      <div *ngIf="mobno['mobctrl'].errors?.['pattern'] && mobno['mobctrl'].dirty">Please enter 10 digit mobile number</div>
    </div>
  </div>

  <div>
    <button type="submit" [disabled]="!formGrp.valid" (click)="doSubmit()">Save</button>
  </div>
</form>

Step4: Update TS Code

In our TypeScript file, We need to import FormBuilder, FormGroup, and Validators from angular forms.

Update app.component.ts as shown below

import { Component } from '@angular/core';
import { AbstractControl, FormBuilder, FormGroup, Validators } from '@angular/forms';

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

export class AppComponent {

  formGrp: FormGroup;
  mobileNumber: number;

  constructor(formBuilder: FormBuilder) {
    this.mobileNumber = 0;
    this.formGrp = formBuilder.group({
      mobctrl: ['', [Validators.required, Validators.pattern("^((\\+91-?)|0)?[0-9]{10}$")]]
    })
  }

  get mobno(){
    return this.formGrp.controls;
  }

  doSubmit() {
    console.log(this.formGrp.value);
    console.log(this.mobileNumber);
  }

}

Step5: Update SCSS

We are showing the error part using CSS as shown below.

Update app.component.scss

.show-error{
    color: red;
}

Step6: Run & See the Output

Now, Everything is done. Just need to run the angular application & see the output.

Run the Angular application using the below command

ng serve

Output

In this output, We can get the input values using two ways. One is from form value & another uses ngModel.