Ways to sign up for the activeDate variable in MatCalendar so you can display the month and year labels of the current active date in the

As a newcomer to Angular, I am working on creating a datepicker with a customized header. I have successfully passed a custom header for the mat-calendar component. Reference: https://material.angular.io/components/datepicker/overview#customizing-the-calendar-header

However, I am facing an issue where I need to show the current active Date's month in the header.

**.html

{{ monthLabel }}

**.ts

monthLabel = this.getMonthLabel()
months = ['Jan','Feb','Mar','Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dev'];
private getMonthLabel(){
   return this.months[this.dateAdapter.getMonth(this.calendar.activeDate)];
}

Whenever a user selects a different month in the datepicker, the monthLabel does not update. How can I solve this problem using | async ? If anyone could offer guidance on achieving this, it would be greatly appreciated.

angulartypescriptrxjsangular-material

Answer №1

Reasons why your code is not functioning:

The issue lies in the fact that you are only calling the function getMonthLabel() once, specifically when assigning its outcome to monthLabel.

To rectify this problem, consider implementing the following solution:

  monthLabel$ = new BehaviorSubject<string>();
  months = ['January','February','March','April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'];

  private determineMonth(date: Date | null) {
    this.monthLabel$.next(date ? this.months[date.getMonth()] : '');
  }

Make sure to update your HTML code as well:

{{ monthLabel$ | async }}
...
<mat-calendar (selectedChange)="determineMonth">
...

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