Real-Time Updates

import { NgModule, Component, enableProdMode, ChangeDetectionStrategy, } from '@angular/core'; import { BrowserModule } from '@angular/platform-browser'; import { platformBrowserDynamic } from '@angular/platform-browser-dynamic'; import { DxDataGridModule, DxSliderModule } from 'devextreme-angular'; import DataSource from 'devextreme/data/data_source'; import ArrayStore from 'devextreme/data/array_store'; import { Product, Order, Service } from './app.service'; if (!/localhost/.test(document.location.host)) { enableProdMode(); } @Component({ selector: 'demo-app', templateUrl: 'app/app.component.html', styleUrls: ['app/app.component.css'], providers: [Service], changeDetection: ChangeDetectionStrategy.OnPush, }) export class AppComponent { productsDataSource: DataSource; orders: ArrayStore; updatesPerSecond = 100; constructor(service: Service) { this.productsDataSource = new DataSource({ store: service.getProducts(), reshapeOnPush: true, }); this.orders = service.getOrders(); setInterval(() => { if (service.getOrderCount() > 500000) { return; } for (let i = 0; i < this.updatesPerSecond / 20; i++) { service.addOrder(); } }, 50); } getDetailGridDataSource(product: Product) { return new DataSource({ store: this.orders, reshapeOnPush: true, filter: ['ProductID', '=', product.ProductID], }); } getAmount(order: Order) { return order.UnitPrice * order.Quantity; } } @NgModule({ imports: [ BrowserModule, DxDataGridModule, DxSliderModule, ], declarations: [AppComponent], bootstrap: [AppComponent], }) export class AppModule { } platformBrowserDynamic().bootstrapModule(AppModule);

::ng-deep .options { padding: 20px; margin-top: 20px; background-color: rgba(191, 191, 191, 0.15); } ::ng-deep .caption { font-weight: 500; font-size: 18px; } ::ng-deep .option { margin-top: 10px; display: flex; align-items: center; } ::ng-deep .option > span { position: relative; top: 2px; margin-right: 10px; } ::ng-deep .option > .dx-widget { width: 500px; display: inline-block; vertical-align: middle; }

import { Injectable } from '@angular/core'; import ArrayStore from 'devextreme/data/array_store'; export class Product { ProductID: number; ProductName: string; UnitPrice: number; Quantity: number; Amount: number; OrderCount: number; } export class Order { OrderID: number; ShipCity: string; ProductID: number; UnitPrice: number; OrderDate: Date; Quantity: number; } const cities = ['Los Angeles', 'Denver', 'Bentonville', 'Atlanta', 'Reno', 'Beaver', 'Malibu', 'Phoenix', 'San Diego', 'Little Rock', 'Pasadena', 'Boise', 'San Jose', 'Chatsworth', 'San Fernando', 'South Pasadena', 'San Fernando Valley', 'La Canada', 'St. Louis']; const products: Product[] = []; for (let i = 1; i <= 100; i++) { products.push({ ProductID: i, ProductName: `Product ${i}`, UnitPrice: Math.floor(Math.random() * 1000) + 1, Quantity: 0, Amount: 0, OrderCount: 0, }); } const productsStore: ArrayStore = new ArrayStore({ data: products, key: 'ProductID', }); const orders = []; const ordersStore = new ArrayStore({ key: 'OrderID', data: orders, }); @Injectable() export class Service { getProducts() { return productsStore; } getOrders() { return ordersStore; } getOrderCount() { return orders.length; } addOrder() { const product = products[Math.round(Math.random() * 99)]; const order: Order = { OrderID: orders.length ? orders[orders.length - 1].OrderID + 1 : 20001, ShipCity: cities[Math.round(Math.random() * (cities.length - 1))], ProductID: product.ProductID, UnitPrice: product.UnitPrice, OrderDate: new Date(), Quantity: Math.round(Math.random() * 20) + 1, }; ordersStore.push([{ type: 'insert', data: order }]); productsStore.push([{ type: 'update', key: order.ProductID, data: { OrderCount: product.OrderCount + 1, Quantity: product.Quantity + order.Quantity, Amount: product.Amount + order.UnitPrice * order.Quantity, }, }]); } }

// In real applications, you should not transpile code in the browser. // You can see how to create your own application with Angular and DevExtreme here: // https://js.devexpress.com/Documentation/Guide/Angular_Components/Getting_Started/Create_a_DevExtreme_Application/ window.config = { transpiler: 'ts', typescriptOptions: { module: 'system', emitDecoratorMetadata: true, experimentalDecorators: true, }, meta: { 'typescript': { 'exports': 'ts', }, 'devextreme/localization.js': { 'esModule': true, }, }, paths: { 'npm:': 'https://unpkg.com/', }, map: { 'ts': 'npm:plugin-typescript@8.0.0/lib/plugin.js', 'typescript': 'npm:typescript@3.5.3/lib/typescript.js', '@angular/core': 'npm:@angular/core@12.2.15', '@angular/platform-browser': 'npm:@angular/platform-browser@12.2.15', '@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic@12.2.15', '@angular/forms': 'npm:@angular/forms@12.2.15', '@angular/common': 'npm:@angular/common@12.2.15', '@angular/compiler': 'npm:@angular/compiler@12.2.15', 'tslib': 'npm:tslib@2.3.1/tslib.js', 'rxjs': 'npm:rxjs@6.4.0', 'rrule': 'npm:rrule@2.6.6/dist/es5/rrule.js', 'luxon': 'npm:luxon@1.28.0/build/global/luxon.min.js', 'es6-object-assign': 'npm:es6-object-assign@1.1.0', 'devextreme': 'npm:devextreme@21.2.5/cjs', 'devextreme/bundles/dx.all': 'npm:devextreme@21.2.5/bundles/dx.all.js', 'jszip': 'npm:jszip@3.7.1/dist/jszip.min.js', 'devextreme-quill': 'npm:devextreme-quill@1.5.11/dist/dx-quill.min.js', 'devexpress-diagram': 'npm:devexpress-diagram@2.1.45', 'devexpress-gantt': 'npm:devexpress-gantt@4.0.3', 'devextreme-angular': 'npm:devextreme-angular@21.2.5', '@devextreme/runtime': 'npm:@devextreme/runtime@2.3.14', 'inferno': 'npm:inferno@7.4.11/dist/inferno.min.js', 'inferno-compat': 'npm:inferno-compat@7.4.11/dist/inferno-compat.min.js', 'inferno-create-element': 'npm:inferno-create-element@7.4.11/dist/inferno-create-element.min.js', 'inferno-dom': 'npm:inferno-dom/dist/inferno-dom.min.js', 'inferno-hydrate': 'npm:inferno-hydrate@7.4.11/dist/inferno-hydrate.min.js', 'inferno-clone-vnode': 'npm:inferno-clone-vnode@7.4.11/dist/inferno-clone-vnode.min.js', 'inferno-create-class': 'npm:inferno-create-class@7.4.11/dist/inferno-create-class.min.js', 'inferno-extras': 'npm:inferno-extras@7.4.11/dist/inferno-extras.min.js', }, packages: { 'app': { main: './app.component.ts', defaultExtension: 'ts', }, 'devextreme': { defaultExtension: 'js', }, 'devextreme/events/utils': { main: 'index', }, 'devextreme/events': { main: 'index', }, 'es6-object-assign': { main: './index.js', defaultExtension: 'js', }, }, packageConfigPaths: [ 'npm:@devextreme/*/package.json', 'npm:@devextreme/runtime@2.3.14/inferno/package.json', 'npm:@angular/*/package.json', 'npm:@angular/common@12.2.15/*/package.json', 'npm:rxjs@6.4.0/package.json', 'npm:rxjs@6.4.0/operators/package.json', 'npm:devextreme-angular@21.2.5/*/package.json', 'npm:devextreme-angular@21.2.5/ui/*/package.json', 'npm:devextreme-angular@21.2.5/package.json', 'npm:devexpress-diagram@2.1.45/package.json', 'npm:devexpress-gantt@4.0.3/package.json', ], }; System.config(window.config);

<!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>DevExtreme Demo</title> <meta http-equiv="X-UA-Compatible" content="IE=edge" /> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/21.2.5/css/dx.common.css" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/21.2.5/css/dx.light.css" /> <script src="https://unpkg.com/core-js@2.4.1/client/shim.min.js"></script> <script src="https://unpkg.com/zone.js@0.11.4/dist/zone.js"></script> <script src="https://unpkg.com/reflect-metadata@0.1.3/Reflect.js"></script> <script src="https://unpkg.com/systemjs@0.21.3/dist/system.js"></script> <script src="config.js"></script> <script> System.import("app").catch(console.error.bind(console)); </script> </head> <body class="dx-viewport"> <div class="demo-container"> <demo-app>Loading...</demo-app> </div> </body> </html>