Angular forms FormControlName Directive

In this article, we are going to see what is FormControlName in Angular 10 and how to use it.

FormControlName is used to sync a FormControl in an existing FormGroup to a form control element by name.

Syntax:

<form [FormControlName] ="name">

Exported from:

• ReactiveFormsModule

Selectors:

• [FormControlName]

Approach: 

• Create the Angular app to be used
• In app.component.ts make an object that contain value for the input.
• In app.component.html use FormControlName to get values.
• Serve the angular app using ng serve to see the output.

Example 1:

app.component.ts

import { Component, Inject } from '@angular/core';
  import { FormGroup, FormControl, FormArray } from '@angular/forms'
  @Component({
    selector: 'app-root',
    templateUrl: './app.component.html',
    styleUrls: [ './app.component.css' ]
  })
  export class AppComponent  {
    form = new FormGroup({
        name: new FormControl(),
        rollno: new FormControl()
    });

    get name(): any {
      return this.form.get('name');
    }
    get rollno(): any {
      return this.form.get('rollno');
    }

    onSubmit(): void {
      console.log(this.form.value);
    }

  }

app.component.html

<br>
<form [formGroup]="form" (ngSubmit)="onSubmit()">
    <input formControlName="name" placeholder="Name">
    <input formControlName="rollno" placeholder="RollNo">
  <br>
  <button type='submit'>Submit</button>
  <br>
  <br>
</form>

Output:

Reference: https://angular.io/api/forms/FormControlName