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Array is undefined when trying to access it [duplicate]

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I have a service class in typescript, in the class i have declared a public array of strings, but when I trying push into the array it throws the undefined exception. What could I be doing wrong here?

Cannot read property 'audioInput' of undefined

The source code of the class is :

export class AudioService
public audioInput:Array<String>=;
_navigator=<any> navigator;
constructor()

getDevices()
this._navigator.mediaDevices.enumerateDevices().then(this.gotDevices)

gotDevices(deviceInfos) : any
for (let i = 0; i !== deviceInfos.length; ++i)
const deviceInfo = deviceInfos[i];
let value = deviceInfo.deviceId;
if (deviceInfo.kind === 'audioinput')
this.audioInput.push(deviceInfo.label);






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then(this.gotDevices)

then(this.gotDevices.bind(this))

then(i => this.gotDevices(i))

1 Answer
1

If you are accessing 'this' inside cordova. it refers to window object. you need to define let me = this;

export class AudioService
public audioInput:Array<String>=;
_navigator=<any> navigator;
constructor()

getDevices()
this._navigator.mediaDevices.enumerateDevices().then(this.gotDevices)

gotDevices(deviceInfos) : any
let me = this.
for (let i = 0; i !== deviceInfos.length; ++i)
const deviceInfo = deviceInfos[i];
let value = deviceInfo.deviceId;
if (deviceInfo.kind === 'audioinput')
me.audioInput.push(deviceInfo.label);