How to create Template Driven Form Validation in Angular 8?

Here is a Angular 8 template driven form validation example. I would like to give you example of how to create template driven form in Angular 8. I will give you simple example of template driven form validation in Angular 8.

Angular 8 provide forms and they provide way to handle user input using ngModel, ngSubmit. Angular 8 provide Template-driven froms and using Template Driven Forms you can create very simple and basic level form.

If you have simple and basic form in your Angular 8 application then i will prefer to use Template Driven Forms in angular. Here I write simple example of Template Driven Forms with validation in Angular 8.

You need to follow bellow step to create template driven form in angular 8.

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-new-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 } from '@angular/forms';

   

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

   

@NgModule({

  declarations: [

    AppComponent

  ],

  imports: [

    BrowserModule,

    FormsModule

  ],

  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.

src/app/app.component.html

<h1>Template Driven Forms Validation in Angular 8 Example - ItSolutionStuff.com</h1>

   

<form #contactForm="ngForm" (ngSubmit)="submit(contactForm.value)">

   

  <div class="form-group">

      <label for="firstName">First Name</label>

      <input required minlength="3" maxlength="10" ngModel name="firstName" type="text" #firstName="ngModel" class="form-control" id="firstName">

      <div class="alert alert-danger" *ngIf="firstName.touched && !firstName.valid">

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

          <div *ngIf="firstName.errors.minlength">First Name is minimum {{ firstName.errors.minlength.requiredLength }} character.</div>

          <div *ngIf="firstName.errors.maxlength">First Name is maximum 10 character.</div>

      </div>

  </div>

   

  <div class="form-group">

      <label for="lastName">Last Name</label>

      <input required ngModel name="lastName" type="text" #lastName="ngModel" class="form-control" id="lastName">

      <div class="alert alert-danger" *ngIf="lastName.touched && !lastName.valid">

          Last Name is required.

      </div>

  </div>

   

  <div class="form-group">

      <label for="comment">Comment</label>

      <textarea required ngModel #comment="ngModel" name="comment" id="comment" cols="30" rows="10" class="form-control"></textarea>

      <div class="alert alert-danger" *ngIf="comment.touched && !firstName.valid">

          Comment is required.

      </div>

  </div>

    

  <button class="btn btn-primary" type="submit" [class.disabled]="!contactForm.valid">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';

   

@Component({

  selector: 'app-root',

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

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

})

export class AppComponent {

  

  submit(form){

    var firstName = form.firstName;

    console.log(firstName);

  

    var lastName = form.lastName;

    console.log(lastName);

  

    var comment = form.comment;

    console.log(comment);

  }

  

}

Now you can run your application using following command:

ng serve

I hope it can help you…

#Angular