Edit State Management (CTP)

import { NgModule, Component, OnInit, OnDestroy, enableProdMode } from '@angular/core'; import { BrowserModule } from '@angular/platform-browser'; import { platformBrowserDynamic } from '@angular/platform-browser-dynamic'; import { HttpClientModule } from '@angular/common/http'; import { DxDataGridModule, DxLoadPanelModule } from 'devextreme-angular'; import { Service, Order, Change } from './app.service'; import { Observable, Subscription } from 'rxjs'; if (!/localhost/.test(document.location.host)) { enableProdMode(); } @Component({ selector: 'demo-app', templateUrl: 'app/app.component.html', styleUrls: ['app/app.component.css'], providers: [Service], preserveWhitespaces: true }) export class AppComponent implements OnInit, OnDestroy { ordersSubscription: Subscription; orders$: Observable<Order[]>; changes: Change<Order>[] = []; editRowKey?: number = null; isLoading = false; loadPanelPosition = { of: '#gridContainer' }; constructor(private service: Service) { } ngOnInit() { this.orders$ = this.service.getOrders(); this.isLoading = true; this.ordersSubscription = this.orders$.subscribe(() => { this.isLoading = false; }); } get changesText(): string { return JSON.stringify(this.changes.map((change) => ({ type: change.type, key: change.type !== 'insert' ? change.key : undefined, data: change.data })), null, ' '); } onSaving(e: any) { const change = e.changes[0]; if(change) { e.cancel = true; e.promise = this.processSaving(change); } } async processSaving(change: Change<Order>) { this.isLoading = true; try { await this.service.saveChange(change); this.editRowKey = null; this.changes = []; } finally { this.isLoading = false; } } ngOnDestroy() { this.ordersSubscription.unsubscribe(); } } @NgModule({ imports: [ BrowserModule, DxDataGridModule, DxLoadPanelModule, HttpClientModule ], declarations: [AppComponent], bootstrap: [AppComponent] }) export class AppModule { } platformBrowserDynamic().bootstrapModule(AppModule);

::ng-deep #gridContainer { height: 440px; } ::ng-deep .options { padding: 20px; margin-top: 20px; background-color: rgba(191, 191, 191, 0.15); } ::ng-deep .caption { margin-bottom: 10px; font-weight: 500; font-size: 18px; } ::ng-deep .option { margin-bottom: 10px; } ::ng-deep .option > span { position: relative; margin-right: 10px; } ::ng-deep .option > div { display: inline-block; font-weight: bold; }

import { Injectable } from '@angular/core'; import { HttpClient, HttpParams } from '@angular/common/http'; import { BehaviorSubject, Observable } from 'rxjs'; import applyChanges from 'devextreme/data/apply_changes'; export class Order { OrderID: number; ShipName: string; ShipCountry: string; ShipCity: string; ShipAddress: string; OrderDate: string; Freight: number; } export class Change<T> { type: "insert" | "update" | "remove"; key: any; data: Partial<T>; } @Injectable() export class Service { private orders$ = new BehaviorSubject<Order[]>([]); private url = "https://js.devexpress.com/Demos/Mvc/api/DataGridWebApi"; constructor(private http: HttpClient) { } updateOrders(change: Change<Order>, data: Order) { change.data = data; const orders = applyChanges(this.orders$.getValue(), [change], { keyExpr: "OrderID" }); this.orders$.next(orders); } getOrders(): Observable<Order[]> { this.http.get(`${this.url}/Orders?skip=700`, { withCredentials: true }).toPromise().then((data) => { this.orders$.next(data["data"]); }); return this.orders$.asObservable(); } async insert(change: Change<Order>): Promise<Order> { const httpParams = new HttpParams({ fromObject: { values: JSON.stringify(change.data) } }); const httpOptions = { withCredentials: true, body: httpParams }; const data = await this.http.post<Order>(`${this.url}/InsertOrder`, httpParams, httpOptions).toPromise(); this.updateOrders(change, data); return data; } async update(change: Change<Order>): Promise<Order> { const httpParams = new HttpParams({ fromObject: { key: change.key, values: JSON.stringify(change.data) } }); const httpOptions = { withCredentials: true, body: httpParams }; const data = await this.http.put<Order>(`${this.url}/UpdateOrder`, httpParams, httpOptions).toPromise(); this.updateOrders(change, data); return data; } async remove(change: Change<Order>): Promise<Order> { const httpParams = new HttpParams({ fromObject: { key: change.key } }); const httpOptions = { withCredentials: true, body: httpParams }; const data = await this.http.delete<Order>(`${this.url}/DeleteOrder`, httpOptions).toPromise(); this.updateOrders(change, data); return data; } async saveChange(change: Change<Order>): Promise<Order> { switch (change.type) { case "insert": return this.insert(change); case "update": return this.update(change); case "remove": return this.remove(change); } } };

// 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/ System.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': 'npm:@angular', 'tslib': 'npm:tslib@2.0.3/tslib.js', 'rxjs': 'npm:rxjs@6.3.3', 'rrule': 'npm:rrule@2.6.6/dist/es5/rrule.js', 'luxon': 'npm:luxon@1.25.0/build/global/luxon.min.js', 'es6-object-assign': 'npm:es6-object-assign@1.1.0', 'devextreme': 'npm:devextreme@20.2.4', 'jszip': 'npm:jszip@3.5.0/dist/jszip.min.js', 'devextreme-quill': 'npm:devextreme-quill@0.9.7/dist/dx-quill.min.js', 'devexpress-diagram': 'npm:devexpress-diagram@2.0.5', 'devexpress-gantt': 'npm:devexpress-gantt@2.0.8', 'devextreme-angular': 'npm:devextreme-angular@20.2.4', 'preact': 'npm:preact@10.5.7/dist/preact.js', 'preact/hooks': 'npm:preact@10.5.7/hooks/dist/hooks.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:@angular/*/package.json", "npm:@angular/common/*/package.json", "npm:rxjs/package.json", "npm:rxjs/operators/package.json", "npm:devextreme-angular/*/package.json", "npm:devextreme-angular/ui/*/package.json", "npm:devextreme-angular/package.json", "npm:devexpress-diagram/package.json", "npm:devexpress-gantt/package.json", ] });

<!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/20.2.4/css/dx.common.css" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/20.2.4/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@0.10.2/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>