Sample app for observable-entities-js
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README.md

Sample Angular App for observable-entities-js

Sample app for observable-entities-js.

Note: You must install rxjs version 5.4.3 or greater, in order to avoid a compilation error.

  • For more info see this issue.

Note: You must change the TypeScript compiler target to "es2015" in ts.config.json, tsconfig.app.json and tsconfig.spec.json.

  • Apps using observable-entities can support most modern browsers (Chrome, Firefox, Safari, Edge, etc), but they will not be able to support legacy browsers (Internet Explorer).

Setup

Install observable-entities as a runtime dependency from npm.

npm i --save observable-entities

Usage

To observe property changes on an object, create a class that extends ObservableEntity. Then add a constructor that returns super.proxify(this). For example

export class Product extends ObservableEntity {
  productId: number;
  productName: string;
  unitPrice: number;

  constructor() {
    super();
    return super.proxify(this);
  }
}

ObservableEntity as a modifyListeners property of type Subject<INotifyInfo>[]. To listen for property changes, add a listener can call subscribe on it. For example, an Angular component can perform observable-based data binding with an OnPush strategy.

// Trigger binding when item is updated
this.modifyListener = new Subject<INotifyInfo>();
this.modifyListener.subscribe(info => {
  this.cd.markForCheck();
});

// Add listener to each product
this.products.forEach(product => {
  product.modifyListeners.push(this.modifyListener);
});

Similarly, ObservableSet and ObservableMap have addListeners and removeListeners properties, and you can add listeners to trigger data binding when items are added or removed.

// Trigger data binding when item is added
this.addListener = new Subject<INotifyInfo>();
this.addListener.subscribe(info => {
  this.cd.markForCheck();
});

// Add listenter to products
this.products.addListeners.push(this.addListener);

This project was generated with Angular CLI version 1.4.1.

Development server

Run ng serve for a dev server. Navigate to http://localhost:4200/. The app will automatically reload if you change any of the source files.