Programmatically Set Date of NgbDatePicker

Introduction

In this blog post, we will explore how to programmatically set the date of NgbDatePicker in an Angular application. NgbDatePicker is a datepicker component provided by the ng-bootstrap library, which offers a variety of features for handling date selection. We will discuss a specific scenario where the calendar popup changes the date, but the input field doesn’t update itself. We’ll delve into the problem and provide a solution using Reactive Forms API. So let’s get started!

The Issue: Date Not Updating

When using NgbDatePicker in our Angular component, we might encounter a situation where the calendar popup successfully changes the selected date, but the associated input field doesn’t reflect this change. This can be confusing for the user and needs to be addressed.

Solution: Using Reactive Forms API

To resolve this issue, we can leverage the power of Reactive Forms API provided by Angular. By accessing the form control associated with the input field, we can manually update its value to reflect the newly selected date.

In your component’s code, make use of the setValue() method to update the value of the endDate form control. Here’s an example:

code


































import { Component, ViewChild } from '@angular/core';
import { FormControl, FormGroup } from '@angular/forms';
import { NgbDatepicker } from '@ng-bootstrap/ng-bootstrap';

@Component({
  selector: 'app-datepicker-example',
  templateUrl: './datepicker-example.component.html',
  styleUrls: ['./datepicker-example.component.css'] 




















})
export class DatepickerExampleComponent {
  @ViewChild('e', { static: false }) endDateComponent: NgbDatepicker;
  createAnnForm: FormGroup;

  constructor() {
    this.createAnnForm = new FormGroup({
      startDate: new FormControl(),
      endDate: new FormControl()
    });
  }

  setNewMinDate(e) {
    const { year, month, day } = e;
    const minDate = moment(`${year}-${month}-${day}`);

    this.createAnnForm.get('endDate').setValue(minDate.toISOString());
    this.endDateComponent.navigateTo(e);
  }
}

In the above example, we define a form group named createAnnForm, which contains two form controls: startDate and endDate. We access the endDate form control using get('endDate') and update its value using setValue(). This ensures that the input field reflects the newly selected date.

Additional Information

If you’re working with the NgbDatePicker component in Angular and facing an issue where the calendar popup changes the date but the associated input field doesn’t update, there are a few things you can try to troubleshoot the problem.

Check the FormControl Binding

Ensure that you have correctly bound the form control to the input field. In your template file, make sure the formControlName attribute is set to the correct name of the form control. For example:

htmlCopy code
<input type="text" ngbDatepicker [readonly] ="true" formControlName="endDate">

Update the FormControl Value

As mentioned earlier, you can use the setValue() method of the form control to update its value manually. In your component’s code, access the form control using get('endDate') and set the new value using setValue(). Here’s an example:

code


































import { Component, ViewChild } from '@angular/core';
import { FormControl, FormGroup } from '@angular/forms';
import { NgbDatepicker } from '@ng-bootstrap/ng-bootstrap';

@Component({
  selector: 'app-datepicker-example',
  templateUrl: './datepicker-example.component.html',
  styleUrls: ['./datepicker-example.component.css'] 




















})
export class DatepickerExampleComponent {
  @ViewChild('e', { static: false }) endDateComponent: NgbDatepicker;
  createAnnForm: FormGroup;

  constructor() {
    this.createAnnForm = new FormGroup({
      startDate: new FormControl(),
      endDate: new FormControl()
    });
  }

  setNewMinDate(e) {
    const { year, month, day } = e;
    const minDate = moment(`${year}-${month}-${day}`);

    this.createAnnForm.get('endDate').setValue(minDate.toISOString());
    this.endDateComponent.navigateTo(e);
  }
}

Use Reactive Forms API

In your Angular component, make sure you have imported the necessary modules for Reactive Forms. This includes importing FormControl and FormGroup from '@angular/forms'. Also, ensure that you have defined the necessary form controls within the form group.

Conclusion

In this article, we discussed a common issue with NgbDatePicker in Angular, where the input field doesn’t update after changing the date in the calendar popup. We provided a solution using Reactive Forms API, where you can manually update the form control’s value using setValue(). By following the steps outlined above and applying the provided code examples, you should be able to resolve the issue and ensure that the input field reflects the selected date correctly.

If you have any further questions or need additional assistance, please feel free to leave a comment below.