通过getter Typescript Angular 2更改变量值

Question

I'm trying to change the value in a Variable if the recieved content from a Json is empty. My approach is it to alter my getter Method. For some reasons it seems like the getter Method doesn't get called and it changes nothing, even though I make a call on it. Maybe you Guys can help me.

Here I try to customise my getter, but at runtime it doesn't get used:

export class Chart {
   private _options: any;

   get options(): any {
     if (this._options){
        this._options = {rotation: Math.PI, circumference: Math.PI};
        return this._options;
     } else {
        console.log(this._options);
        return this._options;
     }
   }
}

And here is my component.ts class where I try to use this Variable:

import {Component, Input, OnInit} from '@angular/core';
import {Chart} from "../main-content/entity/dashboard-config-fetcher";


@Component({
  selector: 'app-chart',
  templateUrl: './chart.component.html',
  styleUrls: ['./chart.component.css']
})
export class ChartComponent implements OnInit {

  @Input()
  chart: Chart;

  public options: any;

  constructor() { }

  ngOnInit() {
    this.options = this.chart.options;
    }
}

Thanks in Advance

Answer 1

If i understood you correctly I think ur missing a !

if (this._options) --> if(!this.options)

Otherwise you will return undefined if there is nothing stored in the _options variable