How should I initialize ngbDatepicker with formControlName instead of [(ngmodel)]

Question

I need to use ReactiveForms, with [formGroup] and formGroupName="field"

<form [formGroup]="generalForm" (ngSubmit)="onSubmit()">
  <input class="form-control" placeholder="yyyy-mm-dd" 
  formControlName="dateIni" ngbDatepicker #a="ngbDatepicker">
</form>

Component.ts

generalForm: FormGroup;

ngOnInit() {
this.generalForm = this.formBuilder.group({
  name: ['', Validators.required],
  dateIni: ['', Validators.required],
  dateFin: ['', Validators.required],
  registerDateLimit: ['', Validators.required],
});

}

In my code, I tried to put a default value:

public dateIni: { year: 2017, month: 8, day: 8 };

or

@Input() dateIni: { year: 2017, month: 8, day: 8 };

but it is not taking the default value and all the docs only mention the case with template forms.

Any Idea how should I do it ?

Answer 1

  dateIni: ['', Validators.required],

you need to put your initial value here like

 dateIni: ['2014-01-01', Validators.required],

in correct format

Answer 2

I have faced the same problem and resolved using below code snippet

    import { Component, OnInit, EventEmitter } from '@angular/core';
    import { FormBuilder, Validators, FormArray, FormGroup } from '@angular/forms';
    import { DatePipe } from '@angular/common';
    
    @Component({
      selector: 'app-profile',
      templateUrl: './profile.component.html',
      styleUrls: ['./profile.component.css']
    })
    export class ProfileComponent implements OnInit {
    
     generalForm: FormGroup;
    
    constructor(
        private fb: FormBuilder,
        private datePipe: DatePipe) { }
    
    ngOnInit() {
    
       this.intilizeForm();
    
        const dateIni = "2018-12-08"
        const iniYear =  Number(this.datePipe.transform(dateIni, 'yyyy'));
        const iniMonth =  Number(this.datePipe.transform(dateIni, 'MM'));
        const iniDay =  Number(this.datePipe.transform(dateIni, 'dd'));
        this.generalForm.controls.dateIni.setValue({
          year: iniYear ,
          month: iniMonth ,
          day: iniDay
        });
      
    }
    
      intilizeForm(): void {
      // Here also we can set the intial value Like dateIni:[ {year:2018,month:08, day: 12}, ..... 
        this.generalForm = this.fb.group({
           name: ['', Validators.required],
           dateIni: ['', Validators.required],
           dateFin: ['', Validators.required],
           registerDateLimit: ['', Validators.required],
         
        });
    
      }