Conditional Validation Angular 2 - Model Driven Forms

Question

I have a form in Angular 2 in which I have a checkbox that changes some input[text] on the page. If the checkbox is checked an input that is called 'CPF' is changed to 'CNPJ'. I need CNPJ to be required only if the checkbox is checked since the user will not even see the 'CNPJ' input if its not checked.

Here's a snippet from the HTML code:

    <div class="wrap-acordo">
  <form [formGroup]="formDadosBancarios" novalidate class="" (ngSubmit)="enviarDados(formDadosBancarios.value)">

  <div class="row">
    <div class="col s12">
      <label> Titular: </label>
      <input type="text" formControlName="titular" name="titular" class="forms-econ" placeholder="Nome Completo do Titular">
         <div class="div-validar">
            <span [hidden]="formDadosBancarios.get('titular').hasError('required') || formDadosBancarios.controls.titular.valid || (formDadosBancarios.controls.titular.pristine && !submitted)">
              Titular Inválido (mínimo 3 caracteres).
            </span>
          <span *ngIf="formDadosBancarios.get('titular').hasError('required') && submitted">
            Campo titular obrigatório
          </span><br>
        </div>
    </div>
    <p class="check-margin">
      <input type="checkbox" [checked]="" formControlName="pessoa_juridica" #checkJuridica (change)="handleType(checkJuridica.checked)" class="filled-in check-negociacao" id="pessoaJuridica" />
      <label for="pessoaJuridica">Pessoa Jurídica</label>
    </p>
    <div *ngIf="checkJuridica.checked" class="col s12">
      <label> CNPJ: </label>
      <input type="text" formControlName="cnpj" name="cnpj" class="forms-econ" placeholder="Insira o CNPJ">
        <div class="div-validar">
          <span [hidden]="formDadosBancarios.get('cnpj').hasError('required') || formDadosBancarios.controls.cnpj.valid || (formDadosBancarios.controls.cnpj.pristine && !submitted)">
            CNPJ inválido
          </span>
          <span *ngIf="formDadosBancarios.get('cnpj').hasError('required') && submitted">
            CNPJ é obrigatório
          </span><br>
        </div>
    </div>
    <div *ngIf="!checkJuridica.checked" class="col s12 m6">
      <label> CPF: </label>
      <input type="text" formControlName="cpf" name="cpf" class="forms-econ" placeholder="Insira seu CPF">
        <div class="div-validar">
          <span [hidden]="formDadosBancarios.get('cpf').hasError('required') || formDadosBancarios.controls.cpf.valid || (formDadosBancarios.controls.cpf.pristine && !submitted)">
            CPF inválido
          </span>
          <span *ngIf="formDadosBancarios.get('cpf').hasError('required') && submitted">
            CPF é obrigatório
          </span><br>
        </div>
    </div>
    <div *ngIf="!checkJuridica.checked" class="col s12 m6">
      <label> Data de Nascimento: </label>
      <input type="text" class="forms-econ" formControlName="data_nasc" name="data_nasc" placeholder="ex.: Insira sua data de nascimento">
        <div class="div-validar">
          <span [hidden]="formDadosBancarios.controls.data_nasc.valid || (formDadosBancarios.controls.data_nasc.pristine && !submitted)">
            Data de nascimento é obrigatório
          </span>
        </div>
    </div>
    <div class="col s12 m6">
      <label> Banco: </label>
      <input type="text" class="forms-econ" formControlName="banco" name="banco" placeholder="Banco">
      <div class="div-validar">
        <span [hidden]="formDadosBancarios.controls.banco.valid || (formDadosBancarios.controls.banco.pristine && !submitted)">
         Banco é um campo obrigatório
        </span>
      </div>
    </div>
    <div class="col s12 m6">
      <label> Agência: </label>
      <input type="text" class="forms-econ" formControlName="agencia" name="agencia" placeholder="Agência">
       <div class="div-validar">
         <span [hidden]="formDadosBancarios.controls.agencia.valid || (formDadosBancarios.controls.agencia.pristine && !submitted)">
           Agência é um campo obrigatório
         </span>
       </div>
    </div>
    <div class="col s12 m6">
      <label> Conta: </label>
      <input type="text" class="forms-econ" name="conta" formControlName="conta" placeholder="Conta">
       <div class="div-validar">
         <span [hidden]="formDadosBancarios.controls.conta.valid || (formDadosBancarios.controls.conta.pristine && !submitted)">
           Conta é um campo obrigatório
         </span>
      </div>
    </div>
    <div class="col s12 m6">
      <label> Tipo: </label>
        <select name="tipo" formControlName="tipo" class="forms-econ">
          <option value="motivo_01">Tipo 01</option>
          <option value="motivo_02">Tipo 02</option>
        </select>
       <div class="div-validar">
         <span [hidden]="formDadosBancarios.controls.tipo.valid || (formDadosBancarios.controls.tipo.pristine && !submitted)">
           Tipo é um campo obrigatório
         </span>
       </div>
    </div>
  </div>
  <div class="row center-align">
    <div class="col s12 m6">
      <input type="submit" class="botao-medio btn-aceita" value="Aceitar">
    </div>

and here's a snippet from the component's code:

  import { Component } from '@angular/core';
import {Http} from '@angular/http';
import { FormBuilder, FormGroup, Validators, FormArray, FormsModule, ReactiveFormsModule, AbstractControl, ValidatorFn } from '@angular/forms';
import {FinalizaNegociacaoService} from '../services/finaliza-negociacao.service';
import {dadosAcordo} from '../model/dados-acordo.interface';

@Component({
  moduleId: module.id,
  selector: 'detalhes',
  templateUrl: `finaliza-negociacao.component.html`,
  providers: [FinalizaNegociacaoService]
})

    export class FinalizaNegociacaoComponent  {

      public dados:dadosAcordo;
      public formDadosBancarios: FormGroup;

      public submitted: boolean; 
      public events: any[] = []; 
      public servError:any;
      public servSuccess:any;  
      cpf_REGEXP =  /^\d+$/;

      constructor(private _fb: FormBuilder, private finalizaAcordo:FinalizaNegociacaoService) { } 

        ngOnInit() {  
          this.formDadosBancarios = this._fb.group({
            titular: ['', [<any>Validators.required, <any>Validators.minLength(3)]],
            cpf: ['', [<any>Validators.required, Validators.pattern(this.cpf_REGEXP)]], 
            cnpj: ['', [<any>Validators.required, Validators.pattern(this.cpf_REGEXP)]],
            data_nasc: ['', <any>Validators.required],
            agencia: ['', <any>Validators.required ],
            banco: ['', <any>Validators.required],
            conta: ['', <any>Validators.required],
            tipo:  ['', <any>Validators.required],
            id: ['']
          })      
        }
    enviarDados(model: dadosAcordo, isValid: boolean) {
        this.submitted = true; 
        model.id = Math.floor((Math.random()*100));
        if(this.formDadosBancarios.valid){
          console.log("valid form")
         this.finalizaAcordo.enviaDadosBancarios(model)
          .subscribe(
            res => console.log("Sucesso"),
            error => console.log("ERRO")
          );
        }else{
          console.log("invalid form")
        }
      }

Can someone help me? Thanks in advance :)

developer033 · Accepted Answer · 2017-03-16 01:47:17Z

2

You can do the following:

Create a method to handle the changes of your checkbox:

handleType(isJuridica: boolean): void {
  const cpfCtrl: AbstractControl = this.formDadosBancarios.get('cpf');
  const cnpjCtrl: AbstractControl = this.formDadosBancarios.get('cnpj');
  const reqValidators: ValidatorFn[] = [Validators.required, Validators.pattern(this.cpf_REGEXP)];
  const nullValidator: ValidatorFn = Validators.nullValidator;

  // Set validators accordingly
  if (isJuridica) {
    cpfCtrl.setValidators(nullValidator);
    cnpjCtrl.setValidators(reqValidators);
  } else {
    cpfCtrl.setValidators(reqValidators);
    cnpjCtrl.setValidators(nullValidator);
  }

  // Clean values (if you want to)
  cpfCtrl.patchValue('');
  cnpjCtrl.patchValue('');
  cpfCtrl.updateValueAndValidity();
  cnpjCtrl.updateValueAndValidity();
}

Call it in template:

...
<input type="checkbox" #checkJuridica (change)="handleType(checkJuridica.checked)" class="filled-in check-negociacao" id="pessoaJuridica" />
<label for="pessoaJuridica">Pessoa Jurídica</label>
...

You can check a simple demo below:

PLUNKER

In addition, there is this tutorial which can help you to understand better.

edited Mar 16, 2017 at 1:47

answered Mar 15, 2017 at 1:19

developer033

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7 Comments

Renê Silva Lima Over a year ago

Thank you @developer033, your answer gave me some light over it however I'm getting this error when declaring the consts cpfCtrl and cnpjCtrl: Type 'AbstractControl' is not assignable to type 'FormControl'. Property 'registerOnChange' is missing in type 'AbstractControl'.. Can you please help me with it?

Renê Silva Lima Over a year ago

Thanks but i still getting an invalid form, it's like cpf and cnpj are still both required. Do I have to change something on ngOnInit?

developer033 Over a year ago

@RenêSilvaLima strange.. as you can see in plunker it's working... Maybe it's related to another controls. Feel free to fork the plunker and show me what's wrong.

Renê Silva Lima Over a year ago

Sorry for taking so long, I was trying to fix it up in another way but couldn't make it. I really dont know how to use plunkr properly, I tried but couldn't doo it lol. Anyway, I've update my question, it has now the full code from both files. Can you please take a look at it?

Renê Silva Lima Over a year ago

In this case if I click on the button enviarDados it returns me the log that says invalid form.

|

Pardeep Jain · Accepted Answer · 2017-03-14 18:15:31Z

1

your code is bit complicated but i'll give you tip,may help you to solve your problem.

no need to add validators.required on conditional field like cpf or cnpj, else you have to add validation on event fired on checkbox click.
if you have to disable submit button (in this case better is to call function in disabled attribut like this [disabled]=''checkValidation() and check there your all required fields.

i hope this will put some light on your problem if still not please post full code either recreate your problem on plunker.

answered Mar 14, 2017 at 18:15

Pardeep Jain

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