Angular Chat - File Attachments

import { bootstrapApplication } from '@angular/platform-browser'; import { Component, enableProdMode, provideZoneChangeDetection } from '@angular/core'; import { DxChatModule } from 'devextreme-angular'; import { DxChatTypes } from 'devextreme-angular/ui/chat'; import { type DxFileUploaderTypes } from 'devextreme-angular/ui/file-uploader'; import { DataSource } from 'devextreme-angular/common/data'; import { AppService } from './app.service'; if (!document.location.host.includes('localhost')) { enableProdMode(); } let modulePrefix = ''; // @ts-expect-error if (window && window.config?.packageConfigPaths) { modulePrefix = '/app'; } @Component({ selector: 'demo-app', templateUrl: `app/app.component.html`, styleUrls: [`app/app.component.css`], imports: [ DxChatModule, ], }) export class AppComponent { dataSource: DataSource; user: DxChatTypes.User; constructor(private readonly appService: AppService) { this.dataSource = this.appService.dataSource; this.user = this.appService.currentUser; } onMessageEntered(e: DxChatTypes.MessageEnteredEvent): void { this.appService.onMessageEntered(e); } onAttachmentDownloadClick(e: DxChatTypes.AttachmentDownloadClickEvent): void { if (e.attachment) { this.appService.onAttachmentDownloadClick(e.attachment); } } onUploaded = (e: DxFileUploaderTypes.UploadedEvent): void => { this.appService.onUploaded(e.file); }; uploadFile = () => {}; } bootstrapApplication(AppComponent, { providers: [ provideZoneChangeDetection({ eventCoalescing: true, runCoalescing: true }), AppService, ], });

.demo-container { min-width: 720px; } .chat-container { display: flex; flex-grow: 1; align-items: center; justify-content: center; } ::ng-deep .dx-chat { max-width: 480px; } ::ng-deep .caption { font-size: var(--dx-font-size-sm); font-weight: 500; } ::ng-deep .dx-avatar { border: 1px solid var(--dx-color-border); }

import { Injectable } from '@angular/core'; import { type DxChatTypes } from 'devextreme-angular/ui/chat'; import { Guid } from 'devextreme-angular/common'; import { CustomStore, DataSource } from 'devextreme-angular/common/data'; @Injectable() export class AppService { date: Date; customStore: CustomStore; dataSource: DataSource; currentUser: DxChatTypes.User = { id: 'c94c0e76-fb49-4b9b-8f07-9f93ed93b4f3', name: 'John Doe', }; supportAgent: DxChatTypes.User = { id: 'd16d1a4c-5c67-4e20-b70e-2991c22747c3', name: 'Support Agent', avatarUrl: '../../../../images/petersmith.png', }; messages: DxChatTypes.Message[] = []; uploadedFilesMap: Map<string, string>; constructor() { this.date = new Date(); this.date.setHours(0, 0, 0, 0); this.messages = [ { id: new Guid().toString(), timestamp: new Date(this.getTimestamp(this.date, -7)), author: this.currentUser, text: 'Hi! I\'m having trouble accessing my account.\nThe website says my password is incorrect. I\'m sending a few screenshots so you can see where I get the error.', attachments: [ { name: 'Pic1.png', url: '../../../../images/Chat/FileAttachments/Pic1.png', size: 1024 * 10, }, { name: 'Pic2.png', url: '../../../../images/Chat/FileAttachments/Pic2.png', size: 1024 * 10, }, { name: 'Pic3.png', url: '../../../../images/Chat/FileAttachments/Pic3.png', size: 1024 * 10, }, ], }, { id: new Guid().toString(), timestamp: new Date(this.getTimestamp(this.date, -7)), author: this.supportAgent, text: 'Hello! Thanks for including screenshots. To restore access, please follow instructions in the attached file.\nLet me know if you need anything else.', attachments: [ { name: 'Instructions.pdf', url: '../../../../images/Chat/FileAttachments/Instructions.pdf', size: 1024 * 10, }, ], }, ]; this.uploadedFilesMap = new Map(); this.initDataSource(); } getTimestamp(date: Date, offsetMinutes = 0): number { return date.getTime() + offsetMinutes * 60000; } initDataSource() { this.customStore = new CustomStore({ key: 'id', load: async () => this.messages, insert: async (message) => { this.messages.push(message); return message; }, }); this.dataSource = new DataSource({ store: this.customStore, paginate: false, }); } getFileUrl(filename: string): string | undefined { return this.uploadedFilesMap.get(filename); } onUploaded(file: File) { const url = URL.createObjectURL(file); this.uploadedFilesMap.set(file.name, url); } onMessageEntered({ message }: DxChatTypes.MessageEnteredEvent): void { const attachmentsWithUrls = message.attachments?.map((attachment: DxChatTypes.Attachment) => ({ ...attachment, url: this.getFileUrl(attachment.name), })); this.dataSource.store().push([{ type: 'insert', data: { ...message, id: new Guid().toString(), attachments: attachmentsWithUrls, }, }]); } onAttachmentDownloadClick(attachment: DxChatTypes.Attachment) { if (!attachment?.url) { return; } const link = document.createElement('a'); link.setAttribute('href', attachment.url); link.setAttribute('download', attachment.name); document.body.appendChild(link); link.click(); document.body.removeChild(link); } }

// 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/ const componentNames = [ 'accordion', 'action-sheet', 'autocomplete', 'bar-gauge', 'box', 'bullet', 'button-group', 'button', 'calendar', 'card-view', 'chart', 'chat', 'check-box', 'circular-gauge', 'color-box', 'context-menu', 'data-grid', 'date-box', 'date-range-box', 'defer-rendering', 'diagram', 'draggable', 'drawer', 'drop-down-box', 'drop-down-button', 'file-manager', 'file-uploader', 'filter-builder', 'form', 'funnel', 'gallery', 'gantt', 'html-editor', 'linear-gauge', 'list', 'load-indicator', 'load-panel', 'lookup', 'map', 'menu', 'multi-view', 'nested', 'number-box', 'pagination', 'pie-chart', 'pivot-grid-field-chooser', 'pivot-grid', 'polar-chart', 'popover', 'popup', 'progress-bar', 'radio-group', 'range-selector', 'range-slider', 'recurrence-editor', 'resizable', 'responsive-box', 'sankey', 'scheduler', 'scroll-view', 'select-box', 'slider', 'sortable', 'sparkline', 'speech-to-text', 'speed-dial-action', 'splitter', 'stepper', 'switch', 'tab-panel', 'tabs', 'tag-box', 'text-area', 'text-box', 'tile-view', 'toast', 'toolbar', 'tooltip', 'tree-list', 'tree-map', 'tree-view', 'validation-group', 'validation-summary', 'validator', 'vector-map', ]; window.exports = window.exports || {}; window.config = { transpiler: 'ts', typescriptOptions: { module: 'system', emitDecoratorMetadata: true, experimentalDecorators: true, }, meta: { 'typescript': { 'exports': 'ts', }, 'devextreme/time_zone_utils.js': { 'esModule': true, }, 'devextreme/localization.js': { 'esModule': true, }, 'devextreme/viz/palette.js': { 'esModule': true, }, '@angular/platform-browser-dynamic': { 'esModule': true, }, '@angular/platform-browser': { 'esModule': true, }, '@angular/core': { 'esModule': true, }, '@angular/common': { 'esModule': true, }, '@angular/common/http': { 'esModule': true, }, '@angular/animations': { 'esModule': true, }, '@angular/forms': { 'esModule': true, }, 'openai': { 'esModule': true, }, }, paths: { 'npm:': 'https://cdn.jsdelivr.net/npm/', 'bundles:': '../../../../bundles/', 'externals:': '../../../../bundles/externals/', }, map: { 'ts': 'npm:plugin-typescript@8.0.0/lib/plugin.js', 'typescript': 'npm:typescript@4.2.4/lib/typescript.js', 'jszip': 'npm:jszip@3.10.1/dist/jszip.min.js', /* @angular */ '@angular/compiler': 'bundles:@angular/compiler.umd.js', '@angular/platform-browser-dynamic': 'bundles:@angular/platform-browser-dynamic.umd.js', '@angular/core': 'bundles:@angular/core.umd.js', '@angular/core/primitives/signals': 'bundles:@angular/core.primitives.signals.umd.js', '@angular/core/primitives/di': 'bundles:@angular/core.primitives.di.umd.js', '@angular/common': 'bundles:@angular/common.umd.js', '@angular/common/http': 'bundles:@angular/common-http.umd.js', '@angular/platform-browser': 'bundles:@angular/platform-browser.umd.js', '@angular/platform-browser/animations': 'bundles:@angular/platform-browser.umd.js', '@angular/forms': 'bundles:@angular/forms.umd.js', /* devextreme */ 'devextreme': 'npm:devextreme@link:../../packages/devextreme/artifacts/npm/devextreme/cjs', 'devextreme-quill': 'npm:devextreme-quill@1.7.8/dist/dx-quill.min.js', 'devexpress-diagram': 'npm:devexpress-diagram@2.2.24', 'devexpress-gantt': 'npm:devexpress-gantt@4.1.64', /* devextreme-angular umd maps */ 'devextreme-angular': 'bundles:devextreme-angular/devextreme-angular.umd.js', 'devextreme-angular/common/ai-integration': 'bundles:devextreme-angular/devextreme-angular-common-ai-integration.umd.js', 'devextreme-angular/core': 'bundles:devextreme-angular/devextreme-angular-core.umd.js', 'devextreme-angular/common/charts': 'bundles:devextreme-angular/devextreme-angular-common-charts.umd.js', 'devextreme-angular/common/core/animation': 'bundles:devextreme-angular/devextreme-angular-common-core-animation.umd.js', 'devextreme-angular/common/core/environment': 'bundles:devextreme-angular/devextreme-angular-common-core-environment.umd.js', 'devextreme-angular/common/core/events': 'bundles:devextreme-angular/devextreme-angular-common-core-events.umd.js', 'devextreme-angular/common/core/localization': 'bundles:devextreme-angular/devextreme-angular-common-core-localization.umd.js', 'devextreme-angular/common/core': 'bundles:devextreme-angular/devextreme-angular-common-core.umd.js', 'devextreme-angular/common/data/custom-store': 'bundles:devextreme-angular/devextreme-angular-common-data-custom-store.umd.js', 'devextreme-angular/common/data': 'bundles:devextreme-angular/devextreme-angular-common-data.umd.js', 'devextreme-angular/common/export/excel': 'bundles:devextreme-angular/devextreme-angular-common-export-excel.umd.js', 'devextreme-angular/common/export/pdf': 'bundles:devextreme-angular/devextreme-angular-common-export-pdf.umd.js', 'devextreme-angular/common/export': 'bundles:devextreme-angular/devextreme-angular-common-export.umd.js', 'devextreme-angular/common/grids': 'bundles:devextreme-angular/devextreme-angular-common-grids.umd.js', 'devextreme-angular/common': 'bundles:devextreme-angular/devextreme-angular-common.umd.js', 'devextreme-angular/http': 'bundles:devextreme-angular/devextreme-angular-http.umd.js', 'devextreme-angular/core/tokens': 'bundles:devextreme-angular/devextreme-angular-core-tokens.umd.js', ...componentNames.reduce((acc, name) => { acc[`devextreme-angular/ui/${name}`] = `bundles:devextreme-angular/devextreme-angular-ui-${name}.umd.js`; acc[`devextreme-angular/ui/${name}/nested`] = `bundles:devextreme-angular/devextreme-angular-ui-${name}-nested.umd.js`; return acc; }, {}), 'tslib': 'npm:tslib/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@3.4.4/build/global/luxon.min.js', 'es6-object-assign': 'npm:es6-object-assign', 'inferno': 'npm:inferno@8.2.3/dist/inferno.min.js', 'inferno-compat': 'npm:inferno-compat/dist/inferno-compat.min.js', 'inferno-create-element': 'npm:inferno-create-element@8.2.3/dist/inferno-create-element.min.js', 'inferno-dom': 'npm:inferno-dom/dist/inferno-dom.min.js', 'inferno-hydrate': 'npm:inferno-hydrate/dist/inferno-hydrate.min.js', 'inferno-clone-vnode': 'npm:inferno-clone-vnode/dist/inferno-clone-vnode.min.js', 'inferno-create-class': 'npm:inferno-create-class/dist/inferno-create-class.min.js', 'inferno-extras': 'npm:inferno-extras/dist/inferno-extras.min.js', '@preact/signals-core': 'npm:@preact/signals-core@1.8.0/dist/signals-core.min.js', // Prettier 'prettier/standalone': 'npm:prettier@2.8.8/standalone.js', 'prettier/parser-html': 'npm:prettier@2.8.8/parser-html.js', 'zone.js': 'npm:zone.js@0.15.1/bundles/zone.umd.js', }, packages: { 'app': { main: './app.component.ts', defaultExtension: 'ts', }, 'devextreme': { defaultExtension: 'js', }, 'devextreme/events/utils': { main: 'index', }, 'devextreme/common/core/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:rxjs@7.5.3/package.json', 'npm:rxjs@7.5.3/operators/package.json', 'npm:devexpress-diagram@2.2.24/package.json', 'npm:devexpress-gantt@4.1.64/package.json', ], }; window.process = { env: { NODE_ENV: 'production', }, }; System.config(window.config); // eslint-disable-next-line no-console // System.import('@angular/compiler').catch(console.error.bind(console)); // eslint-disable-next-line const useTgzInCSB = ['openai']; let packagesInfo = { "@angular/core": { "version": "21.0.8" }, "core-js": { "version": "2.6.12" }, "typescript": { "version": "5.9.3" }, "zone.js": { "version": "0.15.1" } };

<!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml" lang="en"> <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=5.0" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/25.2.3/css/dx.light.css" /> <script src="https://cdn.jsdelivr.net/npm/core-js@2.6.12/client/shim.min.js"></script> <script src="https://cdn.jsdelivr.net/npm/zone.js@0.15.1/bundles/zone.umd.js"></script> <script src="https://cdn.jsdelivr.net/npm/reflect-metadata@0.1.13/Reflect.js"></script> <script src="https://cdn.jsdelivr.net/npm/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>