What Is FormBuilder In Angular?

in this article, we are learning a form builder in angular, and I can explain simple ways and examples.

The FormBuilder provides syntactic sugar that shortens creating instances of a FormControl, FormGroup, or FormArray. It reduces the amount of boilerplate needed to build complex forms.

The FormBuilder is used to create a big reactive form with minimum code in Angular application. The FormBuilder methods are group() , control() and array() that returns FormGroup , FormControl and FormArray respectively. Using FormBuilder we can directly pass object or array of object of a class to create the form.

FormBuilder is an Angular utility that facilitates the building of reactive forms in Angular apps. It is a class that provides a collection of methods for programmatically creating form controls and groups. FormBuilder enables you to create the form model and validation rules for each control in a systematic and readable manner.

FormBuilder allows you to construct form controls and groups using a simple syntax, as well as establish default values and validation criteria. It also makes it simple to create nested form groups and arrays. FormBuilder may also be utilised with Angular’s Reactive Forms and Template-driven Forms.

Here’s an example of how to use FormBuilder in Angular to construct a reactive form:

import { Component } from '@angular/core';
import { FormBuilder, FormGroup, Validators } from '@angular/forms';

@Component({
  selector: 'app-my-form',
  template: `
    <form [formGroup]="myForm" (ngSubmit)="onSubmit()">
      <input formControlName="name">
      <input formControlName="email">
      <button type="submit">Submit</button>
    </form>
  `,
})
export class MyFormComponent {
  myForm: FormGroup;

  constructor(private fb: FormBuilder) {
    this.myForm = this.fb.group({
      name: ['', Validators.required],
      email: ['', [Validators.required, Validators.email]],
    });
  }

  onSubmit() {
    console.log(this.myForm.value);
  }
}

In the above example, we import the @angular/forms module’s FormBuilder, FormGroup, and Validators. The FormBuilder object is then injected into the component function Object() { [native code] } and used to generate a FormGroup object called myForm. We establish two form controls, “name” and “email,” along with their default values and validation criteria. We then use the formGroup directive to link the myForm FormGroup to the form element, and when the form is submitted, we run the onSubmit function.