Angular dropdown validation

Question

I\'m using Angular 5 with forms validator. I\'m trying to validate a select dropdown to avoid send the form without the user select an item from the select. The problem is t

Answer 1

on submit form you have to set markAsTouched for each controller.

live example: https://stackblitz.com/edit/angular-obcju1

HTML:

    
    Enter Input ...
    maxlength Error ....


    

    País *

    
    

    Enter Country ...
  

  submit

TS:

export class AppComponent  {

  filtersForm: FormGroup;

  countriesOptions = [
      {label: 'New York', value: 'NY'},
      {label: 'Rome', value: 'RM'},
      {label: 'London', value: 'LDN'},
      {label: 'Istanbul', value: 'IST'},
      {label: 'Paris', value: 'PRS'}
  ];

  constructor(private fBuilder: FormBuilder) {

    this.filtersForm = this.fBuilder.group({
      "cifInput": new FormControl("", [ Validators.required, Validators.maxLength(10) ]),
      "paisDropdown": new FormControl("", [ Validators.required ])
    });
  }

  onSubmit() {
    for (let controller in this.filtersForm.controls) {
      this.filtersForm.get(controller).markAsTouched();
    }

    if(this.filtersForm.valid) {
      console.log('Ok')
    } else {
      console.log('No')
    }
  }

  get hasDropDownError() {
    return (
      this.filtersForm.get('paisDropdown').touched &&
      this.filtersForm.get('paisDropdown').errors &&
      this.filtersForm.get('paisDropdown').errors.required
    )
  }

  get hasInputErrorRequired() {
    const controller = this.filtersForm.get('cifInput');
    return controller.touched && controller.errors && controller.errors.required
  }

  get hasInputErrorMaxlength() {
    const controller = this.filtersForm.get('cifInput');
    return controller.touched && controller.errors && controller.errors.maxlength
  }

}