Edit State Management

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 { Observable, Subscription } from 'rxjs'; import { Service, Order, Change } 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], 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, lastValueFrom } 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>; } class Response<T> { data: 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[]> { lastValueFrom(this.http.get(`${this.url}/Orders?skip=700`, { withCredentials: true })) .then((data: Response<Order>) => { this.orders$.next(data.data); }); return this.orders$.asObservable(); } async insert(change: Change<Order>): Promise<Order> { const httpParams = new HttpParams({ fromObject: { values: JSON.stringify(change.data) } }); const httpOptions = { withCredentials: true, body: httpParams }; const data = await lastValueFrom(this.http.post<Order>(`${this.url}/InsertOrder`, httpParams, httpOptions)); 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 lastValueFrom(this.http.put<Order>(`${this.url}/UpdateOrder`, httpParams, httpOptions)); this.updateOrders(change, data); return data; } async remove(change: Change<Order>): Promise<Order> { const httpParams = new HttpParams({ fromObject: { key: change.key } }); const httpOptions = { withCredentials: true, body: httpParams }; const data = await lastValueFrom(this.http.delete<Order>(`${this.url}/DeleteOrder`, httpOptions)); 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/ 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@4.2.4/lib/plugin.js', 'typescript': 'npm:typescript@4.2.4/lib/typescript.js', '@angular/core': 'npm:@angular/core@12.2.16', '@angular/platform-browser': 'npm:@angular/platform-browser@12.2.16', '@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic@12.2.16', '@angular/forms': 'npm:@angular/forms@12.2.16', '@angular/common': 'npm:@angular/common@12.2.16', '@angular/compiler': 'npm:@angular/compiler@12.2.16', 'tslib': 'npm:tslib@2.3.1/tslib.js', 'rxjs': 'npm:rxjs@7.5.3/dist/bundles/rxjs.umd.js', 'rxjs/operators': 'npm:rxjs@7.5.3/dist/cjs/operators/index.js', 'rrule': 'npm:rrule@2.6.4/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@22.1.6/cjs', 'devextreme/bundles/dx.all': 'npm:devextreme@22.1.6/bundles/dx.all.js', 'jszip': 'npm:jszip@3.7.1/dist/jszip.min.js', 'devextreme-quill': 'npm:devextreme-quill@1.5.18/dist/dx-quill.min.js', 'devexpress-diagram': 'npm:devexpress-diagram@2.1.65', 'devexpress-gantt': 'npm:devexpress-gantt@4.1.33', 'devextreme-angular': 'npm:devextreme-angular@22.1.6', '@devextreme/runtime': 'npm:@devextreme/runtime@3.0.11', 'inferno': 'npm:inferno@7.4.4/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', // Prettier 'prettier/standalone': 'npm:prettier@2.7.1/standalone.js', 'prettier/parser-html': 'npm:prettier@2.7.1/parser-html.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', }, 'rxjs': { defaultExtension: 'js', }, 'rxjs/operators': { defaultExtension: 'js', }, }, packageConfigPaths: [ 'npm:@devextreme/*/package.json', 'npm:@devextreme/runtime@3.0.11/inferno/package.json', 'npm:@angular/*/package.json', 'npm:@angular/common@12.2.16/*/package.json', 'npm:rxjs@7.5.3/package.json', 'npm:rxjs@7.5.3/operators/package.json', 'npm:devextreme-angular@22.1.6/*/package.json', 'npm:devextreme-angular@22.1.6/ui/*/package.json', 'npm:devextreme-angular@22.1.6/package.json', 'npm:devexpress-diagram@2.1.65/package.json', 'npm:devexpress-gantt@4.1.33/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/22.1.6/css/dx.common.css" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/22.1.6/css/dx.light.css" /> <script src="https://unpkg.com/core-js@2.6.12/client/shim.min.js"></script> <script src="https://unpkg.com/zone.js@0.11.8/dist/zone.js"></script> <script src="https://unpkg.com/reflect-metadata@0.1.13/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>