---
id: fast-element.propertychangenotifier
title: PropertyChangeNotifier class
hide_title: true
---
<!-- Do not edit this file. It is automatically generated by API Documenter. -->

[@microsoft/fast-element](./fast-element.md) &gt; [PropertyChangeNotifier](./fast-element.propertychangenotifier.md)

## PropertyChangeNotifier class

An implementation of Notifier that allows subscribers to be notified of individual property changes on an object.

<b>Signature:</b>

```typescript
export declare class PropertyChangeNotifier implements Notifier 
```

## Constructors

|  Constructor | Modifiers | Description |
|  --- | --- | --- |
|  [(constructor)(source)](./fast-element.propertychangenotifier._constructor_.md) |  | Creates an instance of PropertyChangeNotifier for the specified source. |

## Properties

|  Property | Modifiers | Type | Description |
|  --- | --- | --- | --- |
|  [source](./fast-element.propertychangenotifier.source.md) |  | any | The source that property changes are being notified for. |

## Methods

|  Method | Modifiers | Description |
|  --- | --- | --- |
|  [notify(propertyName)](./fast-element.propertychangenotifier.notify.md) |  | Notifies all subscribers, based on the specified property. |
|  [subscribe(subscriber, propertyToWatch)](./fast-element.propertychangenotifier.subscribe.md) |  | Subscribes to notification of changes in an object's state. |
|  [unsubscribe(subscriber, propertyToUnwatch)](./fast-element.propertychangenotifier.unsubscribe.md) |  | Unsubscribes from notification of changes in an object's state. |
