Angular 10 Custom Validator Tutorial Example

Now, let's see tutorial of angular 10 custom validator example. This article goes in detailed on how to create custom validator in angular 10. it's simple example of how to create custom validators in angular 10.

We will look at example of angular 10 reactive form custom validation example.

Custom validation is the most important thing in a programming language. most of the cases and most of the project you need to create some custom validation so you can reuse it and also write septate code on file then you can use it as like pre-defined validation.

So if you also need to create a custom validator in your angular 10 application then follow bellow step to create basic angular 10 reactive form custom validator.

We will create new custom validator for not contain space on input field. we will not allow space on username. so let's see now it works.

Step 1: Install Angular App

Here, in this step you need to create new ng app for this demo. if you have already created then don't create new angular 10 app.

ng new my-custom-val-app

Step 2: Import FormsModule

If you want to create form in angular app then you need to import FormsModule from @angular/forms library. so let's add following code to app.module.ts file.

src/app/app.module.ts

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { FormsModule, ReactiveFormsModule } from '@angular/forms';
   
import { AppComponent } from './app.component';
   
@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
    FormsModule,
    ReactiveFormsModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

Step 3: Form with ngModel

In this step, we will write code of html form with ngModel. so add following code to app.component.html file.

I used bootstrap class on this form. if you want to add than then follow this link too: Install Boorstrap 4 to Angular 10.

src/app/app.component.html

<h1>How to Create Custom Validators in Angular 10 - ItSolutionStuff.com</h1>
    
<form [formGroup]="form" (ngSubmit)="submit()">
   
    <div class="form-group">
        <label for="username">Username</label>
        <input 
            formControlName="username"
            id="username" 
            type="text" 
            class="form-control">
        <div *ngIf="f.username.touched && f.username.invalid" class="alert alert-danger">
            <div *ngIf="f.username.errors.required">Username is required.</div>
            <div *ngIf="f.username.errors.minlength">Username should be 3 character.</div>
            <div *ngIf="f.username.errors.cannotContainSpace">Username can not contain space.</div>
        </div>
    </div>
     
    <div class="form-group">
        <label for="password">Password</label>
        <input 
            formControlName="password"
            id="password" 
            type="password" 
            class="form-control">
        <div *ngIf="f.password.touched && f.password.invalid" class="alert alert-danger">
            <div *ngIf="f.password.errors.required">Password is required.</div>
        </div>
    </div>
    
    <button class="btn btn-primary" type="submit">Submit</button>
</form>

Step 4: updated Ts File

In ts file. we will write submit() and get all input fields values. so let's add following code to app.component.ts file.

src/app/app.component.ts

import { Component } from '@angular/core';
import { FormGroup, FormControl, Validators} from '@angular/forms';
import { UsernameValidator } from './username.validator';
  
@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  form = new FormGroup({
    username: new FormControl('', [Validators.required, Validators.minLength(3), UsernameValidator.cannotContainSpace]),
    password: new FormControl('', Validators.required)
  });
   
  get f(){
    return this.form.controls;
  }
    
  submit(){
    console.log(this.form.value);
  }
}

Step 5: Create Custom Validation File

You need to create custom 'username.validator.ts' file and write code as bellow:

src/app/username.validator.ts

import { AbstractControl, ValidationErrors } from '@angular/forms';
  
export class UsernameValidator {
    static cannotContainSpace(control: AbstractControl) : ValidationErrors | null {
        if((control.value as string).indexOf(' ') >= 0){
            return {cannotContainSpace: true}
        }
  
        return null;
    }
}

Now you can run your application using the following command:

ng serve

Now you can see layout as like bellow screen shot:

I hope it can help you...