How to Create Custom Validators in Angular 9/8?

How to Create Custom Validators in Angular 9/8?

In this post we will give you information about How to Create Custom Validators in Angular 9/8?. Hear we will give you detail about How to Create Custom Validators in Angular 9/8?And how to use it also give you demo for it if it is necessary.

Here, i will guide you how to create custom form validator in angular 9/8 application. you will learn to angular 9/8 custom validator example step by step. we can simply write custom validation in angular 9/8 for reactive form.

Custom validation is a most important thing in 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 as like pre define validation.

So if you also need to create custom validator in your angular application then follow bellow step to create basic angular 8 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 8 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 8.

src/app/app.component.html

<h1>How to Create Custom Validators in Angular 8 - ItSolutionStuff.com</h1>

<form [formGroup]="form" (ngSubmit)="submit()">

<div >

<label for="username">Username</label>

<input

formControlName="username"

id="username"

type="text"

>

<div *ngIf="f.username.touched && f.username.invalid" >

<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 >

<label for="password">Password</label>

<input

formControlName="password"

id="password"

type="password"

>

<div *ngIf="f.password.touched && f.password.invalid" >

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

</div>

</div>

<button 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 following command:

ng serve

Now you can see layout as like bellow screen shot:

I hope it can help you…

Hope this code and post will helped you for implement How to Create Custom Validators in Angular 9/8?. if you need any help or any feedback give it in comment section or you have good idea about this post you can give it comment section. Your comment will help us for help you more and improve us. we will give you this type of more interesting post in featured also so, For more interesting post and code Keep reading our blogs

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