Hi again!

Based on an Stackoverflow question (post on Stackoverflow) where they were looking for an YearPicker-component which is according to the post not supported by Angular Material. But in my opinion it is. And in this article I wanna show you how you can simply tweak the existing Angular Material DatePicker component to get a YearPicker component.

Used libraries:

• Angular Version > 13

• Angular Material (based on the MomentJS date implementation, but it works with every other implementation as well)

The result looks like the following picture:

Step 1:

Create a Angular component like ng g c components/yearPicker.

Step 2:

Add following html to the html-template of the YearPicker component:

<mat-form-field appearance="outline">
  <mat-label>Aktuelles Jahr</mat-label>
  <input matInput [matDatepicker]="picker" readonly [value]="selectedYearISOFormat">
  <mat-datepicker-toggle matSuffix [for]="picker"></mat-datepicker-toggle>
  <mat-datepicker  [calendarHeaderComponent]="customCalendarHeader" startView="multi-year" #picker
    (yearSelected)="onYearSelected($event); picker.close()">
  </mat-datepicker>
</mat-form-field>

** Little explaination to the html above:**

• I made the input-element readonly (see readoly-attribute) to only set and change the year with the calendar.

• the variable selectedYearISOFormat binds the selected date (including the year of course) in ISO-Format to the input element.

• I bound a new customCalendarHeader-Component to the [calendarHeaderComponent] attribute to overwrite the default calendar header.

• I set the startView-Attribute to multi-year.

• I set the reference variable #picker.

• I set an onYearSelected($event) handler to the yearSelected-EventEmitter, which emits only if the view on multi-year.

• I'm closing the calendar-popup directly after the handler with the picker.close() methode of the datePicker instance.

Step 3:

Code of the yearPicker component class:

import { Component, ChangeDetectionStrategy, Output, EventEmitter } from '@angular/core';
import { MAT_DATE_FORMATS } from '@angular/material/core';
import * as moment from 'moment';
import { CustomCalendarHeaderComponent } from '<path to your customCalendarHeader component>';


@Component({
  selector: 'gmos-year-picker',
  templateUrl: './year-picker.component.html',
  styleUrls: ['./year-picker.component.scss'],
  changeDetection: ChangeDetectionStrategy.OnPush, providers: [
    {
      provide: MAT_DATE_FORMATS,
      useValue: {
        parse: {
          dateInput: ['l', 'LL'],
        },
        display: {
          dateInput: 'YYYY',
          monthYearLabel: 'MMM YYYY',
          dateA11yLabel: 'LL',
          monthYearA11yLabel: 'MMMM YYYY',
        },
      },
    },
  ],
})
export class YearPickerComponent {

  selectedYearISOFormat?: string = moment().toISOString();

  get selectedYear(): number {
    return moment(this.selectedYearISOFormat).year();
  }

  @Output()
  yearChanged: EventEmitter<number> = new EventEmitter<number>();

  customCalendarHeader = CustomCalendarHeaderComponent;


  public onYearSelected(momentInstance: moment.Moment) {
    this.selectedYearISOFormat = momentInstance.toISOString();
    this.yearChanged.emit(momentInstance.year());
  }
}

Important notes to the code above:

• I overwrite the display->dateInput with: YYYY, to only show the year in the input-element

Step 4:

Create a new component to overwrite and customize the default calendar header: ng g c components/CustomCalendarHeader

Step 5:

Add following html to the customCalendarHeader component:

<div class="header" fxLayout="row" fxLayoutAlign="center center">
  <mat-icon (click)="prev()">chevron_left</mat-icon>
  <span>
    {{label}}
  </span>
  <mat-icon (click)="next()">chevron_right</mat-icon>
</div>

Notes to the html above:

• I put all my style for the header in my header css-class.

• In my example I used Angular Flex Layout (Flex-Layout repo) to use some responsivness helper classes.

Step 6:

Here is the code of the CustomCalendarHeaderComponent class:

import { Component, ChangeDetectionStrategy } from '@angular/core';
import { MatCalendarHeader } from '@angular/material/datepicker';

@Component({
  selector: 'gmos-custom-calendar-header',
  templateUrl: './custom-calendar-header.component.html',
  styleUrls: ['./custom-calendar-header.component.scss'],
  changeDetection: ChangeDetectionStrategy.OnPush
})
export class CustomCalendarHeaderComponent extends MatCalendarHeader<Date> {

  get label() {
    return super.periodButtonText;
  }

  public next() {
    super.nextClicked();
  }

  public prev() {
    super.previousClicked();
  }
}

Notes to the code of the class above:

• I extend the existing MatCalendarHeader component

• Within the click-event handler of the arrow-icons in the header-template I called the methods of the inherited MatCalendarHeader class.

YOU GOT IT! :-)

I hope this article was useful to you and a little bit helpful.