Angular calendar won't reflect changes to minimum or maximum dates

My issue involves a datepicker situated inside a mat-card. Here is the code snippet:

<mat-card class="datepickerContainer">
    <mat-form-field appearance="fill">
        <mat-label>Month and Year</mat-label>
        <input matInput [min]="minDate" [max]="maxDate" [matDatepicker]="datePicker" [formControl]="date">
        <mat-datepicker-toggle matSuffix [for]="datePicker"></mat-datepicker-toggle>
        <mat-datepicker #datePicker
                        startView="multi-year"
                        (yearSelected)="yearSelectedHandler($event)"
                        (monthSelected)="monthSelectedHandler($event, datePicker)"
                        panelClass="example-month-picker">
        </mat-datepicker>
    </mat-form-field>
</mat-card>

After initializing the component in ngAfterViewInit(), I try to set the minimum selectable year based on configurations:

  ngAfterViewInit(): void {
    this.configService.getConfiguration().subscribe((configs) => {
      this.minDate.setFullYear(configs.startYear);
    });
  }

I have ensured that this.minDate.setFullYear() is invoked with the correct year. However, upon opening the date picker interface in the frontend, it appears completely disabled:

https://i.sstatic.net/GOd1g.png

While I can select the displayed year (2022), I am unable to choose a specific month:

https://i.sstatic.net/OPabC.png

No sections of my code explicitly disable the date picker functionality, leading me to question why it seems inactive and why the min year remains unchanged at 2021. Furthermore, when initially setting the min date to a different year (e.g., 2021), everything operates correctly. Therefore, the problem likely stems from Angular failing to recognize the modification made to the min date within ngAfterViewInit().

Answer №1

Make sure to remember to trigger

ChangeDetectorRef.markForCheck()

right after

this.minDate.setFullYear(configs.startYear);

If you don't do this, Angular won't recognize any changes, as it only detects changes based on @Input reference changes and not mutations within bound objects.

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