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://v17.angular.io/api/forms/FormControlName

Angular forms FormControlName Directive

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