Angular2 @Input to a property with get/set

Question

I have an Angular2 component in that component it currently has a bunch fields that have @Input() applied before them to allow binding to that property, i.e.

Answer 1

If you are mainly interested in implementing logic to the setter only:

import { Component, Input, OnChanges, SimpleChanges } from '@angular/core';

// [...]

export class MyClass implements OnChanges {
  @Input() allowDay: boolean;

  ngOnChanges(changes: SimpleChanges): void {
    if(changes['allowDay']) {
      this.updatePeriodTypes();
    }
  }
}

The import of SimpleChanges is not needed if it doesn't matter which input property was changed or if you have only one input property.

Angular Doc: OnChanges

otherwise:

private _allowDay: boolean;

@Input() set allowDay(value: boolean) {
  this._allowDay = value;
  this.updatePeriodTypes();
}
get allowDay(): boolean {
  // other logic
  return this._allowDay;
}