How to enable only specific dates in Angular 5?

Question

I have set of dates and I want to enable only those dates in .

\"ListOfDates\": [
      {
         \"startDate\": \"2018-01-01         


        

Answer 1

myFilter = (d: Date): boolean => {
  let enableFlag = false;
  this.ListOfDates.some((date) => {
    if (date.startDate === d) { // You can use any other comparison operator used by date object
      enableFlag = true;
      return true;
    }
  })
  return enableFlag;
}

Note: You will have to format the d and dates in ListOfDates to a standard format of your choice

Answer 2

You are going to need a custom validator. More details can be found here: https://material.angular.io/components/datepicker/overview#date-validation

Essentially you give a function that takes in a date and returns a boolean indicating whether that date is valid. In your case you want to in your controller check if the given date is a member of your list. Here is a basic implementation:

HTML:

<mat-form-field class="example-full-width">
  <input matInput [matDatepickerFilter]="myFilter" [matDatepicker]="picker" placeholder="Choose a date">
  <mat-datepicker-toggle matSuffix [for]="picker"></mat-datepicker-toggle>
  <mat-datepicker #picker></mat-datepicker>
</mat-form-field>

TS:

import {Component} from '@angular/core';

/** @title Datepicker with filter validation */
@Component({
  selector: 'datepicker-filter-example',
  templateUrl: 'datepicker-filter-example.html',
  styleUrls: ['datepicker-filter-example.css'],
})
export class DatepickerFilterExample {
  validDates = {
    "2018-01-01T08:00:00": true,
    "2018-01-02T08:00:00": true
  }

  myFilter = (d: Date): boolean => {
    // Using a JS Object as a lookup table of valid dates
    // Undefined will be falsy.
    return validDates[d.toISOString()];
  }
}