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Angular 7 Forms Tutorial with Examples

In this angular 7 form tutorial, we are going to learn how to use forms using both technique templates driven forms and reactive forms. Angular js provide two way to work with forms:-

1) Template driven forms

The template-driven forms in angular 7 use the gModel, ngModelGroup, and ngForm classes provided by FormsModule module.

2) Reactive forms ( Model Driven )

The creative forms in angular 7 use the FormControl, FormGroup and FormBuilder classes provided by ReactiveFormsModule module.

Now let’s start with Reactive Forms with an example. In this example, we will add users in our angular 7 application.

First, of you need to import ReactiveFormsModule Module in your src/app/app.module.ts file.


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

		imports: [
		  ...
		  ReactiveFormsModule
		],

Now we will import the FormControl and FormGroup classes in the src/app/adduser.component.ts file.

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

import { FormGroup, FormControl } from '@angular/forms';

@Component({
  selector: 'app-adduser',
  templateUrl: './adduser.component.html',
  styleUrls: ['./adduser.component.css']
})
export class AdduserComponent implements OnInit {

	 adduserForm = new FormGroup({
      name: new FormControl(''),
	    email: new FormControl(''),
	    password: new FormControl(''),
	  });
  constructor() { }

  ngOnInit() {
  }
}

In the above code snippet, We created an adduserForm instance of FormGroup class with three form controls name, email, and password. Now create a form in the app/adduser.component.html file with two way binding:-


<form [formGroup]="adduserForm">
  <label>
    Name:
    <input type="text" formControlName="name" [(ngModel)]="name">
  </label>

  <label>
    Email:
    <input type="email" formControlName="email" [(ngModel)]="email">
  </label>

  <label>
    Password:
    <input type="password" formControlName="password" [(ngModel)]="password">
  </label>

</form>

1) Template driven forms

To use template drive form we need to import { FormsModule } in our app.module.ts file from @angular/Forms. And also add in import section in same ts file look like below:-


import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { HttpClientModule } from '@angular/common/http';
import { AppRoutingModule } from './app-routing.module';
import { AppComponent } from './app.component';
import { HomeComponent } from './home/home.component';
import { DashboardComponent } from './dashboard/dashboard.component';
import { UserdataComponent } from './userdata/userdata.component';
import { BlogComponent } from './blog/blog.component';
import { AdduserComponent } from './adduser/adduser.component';
import { ReactiveFormsModule } from '@angular/forms';
import {FormsModule} from '@angular/forms'

@NgModule({
  declarations: [
    AppComponent,
    HomeComponent,
    DashboardComponent,
    UserdataComponent,
    BlogComponent,
    AdduserComponent
  ],
  imports: [
    BrowserModule,
    AppRoutingModule,
    HttpClientModule,
    ReactiveFormsModule,
    FormsModule
  ],

Now create a form in your component html:-


<h4>Template Driven Form</h4>
<div class="containers">
<div class="row">
<div class="col-md-6">
<form #userRegForm='ngForm' (ngSubmit)="RegisterUser(userRegForm)">
<h2 class="text-center">Users Registration</h2>
  

<div class="form-group">
                  <input type="text" class="form-control" placeholder="User Name" name="username" ngModel >
              </div>
<div class="form-group">
                  <input type="email" class="form-control" id="useremail" placeholder="Email" name="useremail" ngModel>
              </div>
<div class="form-group">
                  <input type="email" class="form-control" id="password" placeholder="Password" name="password" ngModel>
              </div>
  

<div class="align-center">
                  <button type="submit" class="btn btn-default" id="registeruser"  >Register</button>
              </div>

</form>

</div>

</div>
</div>

Create a RegisterUser() function in your component.ts file like below:-


  RegisterUser(userdata){
    console.log(userdata);
  }

NgForm attach the form tag in our application. #userRegForm=’ngForm’ syntax meaning here, we want to create a local variable for our form. (ngSubmit)=”RegisterUser(userRegForm)” syntax mean that We bind the ngSubmit action of our form to get the form value. We used NgModel to register all input in NgForm. NgModel creates the instance of FormControl class and passes it to the form control element.

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