TypeScript Get/Set notifyPropertyChange woes

#1

Hey all. I have a button where the label to be updated based on the value of another class property. However, I can’t seem to work out how to hook up the getters/setters and update notification so that the _connectionBtnText updates when connectionStatus changes…
Any suggestions on the best way to accomplish this?

import { Observable } from 'data/observable'

enum CONNECTION_STATUS {
    DISCONNECTED,
    CONNECTING,
    CONNECTED
}

export class HelloWorldModel extends Observable {

    private connectionStatus: CONNECTION_STATUS
    private _connectBtnText: string

    constructor() {
        super()
        this.connectionStatus = CONNECTION_STATUS.DISCONNECTED
    }

    // MARK: Getters and Setters

    get connectBtnText(): string {
        switch (this.connectionStatus) {
            case CONNECTION_STATUS.DISCONNECTED:
                this._connectBtnText = "Connect"
                break
            case CONNECTION_STATUS.CONNECTING:
                this._connectBtnText = "Connecting"
                break
            case CONNECTION_STATUS.CONNECTED:
                this._connectBtnText = "Connected"
                break
            default:
                break
        }

        return this._connectBtnText
    }

    set connectBtnText(value: string) {
        this._connectBtnText = value
        this.notifyPropertyChange("connectBtnText", value)
    }

    // MARK: Public methods

    public onConnectBtnTap() {
      this.connectionStatus = CONNECTION_STATUS.CONNECTING // THIS IS WHERE THE BUTTON LABEL SHOULD UPDATE
      // ...etc
    }
}