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Advanced Data Binding

Documentation

The Diagram component accepts functions as expression property values. It allows you to implement custom logic when you bind a diagram to a data source. In this demo, the nodes and edges collections are bound to a data source. Custom functions are used to get different shape types and font styles for items based on additional data source information.

The autoLayout property specifies an auto-layout algorithm type and orientation that the component uses to build diagrams.

Backend API
<dx-diagram #diagram id="diagram"> <dxo-nodes [dataSource]="orgItemsDataSource" keyExpr="ID" [typeExpr]="itemTypeExpr" textExpr="Name" [widthExpr]="itemWidthExpr" [heightExpr]="itemHeightExpr" [textStyleExpr]="itemTextStyleExpr" [styleExpr]="itemStyleExpr" > <dxo-auto-layout type="tree" orientation="horizontal"></dxo-auto-layout> </dxo-nodes> <dxo-edges [dataSource]="orgLinksDataSource" keyExpr="ID" fromExpr="From" toExpr="To" [styleExpr]="linkStyleExpr" [fromLineEndExpr]="linkFromLineEndExpr" [toLineEndExpr]="linkToLineEndExpr" ></dxo-edges> <dxo-toolbox> <dxi-group category="general" title="General"></dxi-group> </dxo-toolbox> </dx-diagram>
import { NgModule, Component, ViewChild, enableProdMode, } from '@angular/core'; import { BrowserModule, BrowserTransferStateModule } from '@angular/platform-browser'; import { platformBrowserDynamic } from '@angular/platform-browser-dynamic'; import { HttpClient, HttpClientModule } from '@angular/common/http'; import { DxDiagramModule, DxDiagramComponent } from 'devextreme-angular'; import ArrayStore from 'devextreme/data/array_store'; import { 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], preserveWhitespaces: true, }) export class AppComponent { orgItemsDataSource: ArrayStore; orgLinksDataSource: ArrayStore; constructor(service: Service) { this.orgItemsDataSource = new ArrayStore({ key: 'ID', data: service.getOrgItems(), }); this.orgLinksDataSource = new ArrayStore({ key: 'ID', data: service.getOrgLinks(), }); } itemTypeExpr(obj, value) { if (value) { obj.Type = (value === 'rectangle') ? undefined : 'group'; } else { return obj.Type === 'group' ? 'ellipse' : 'rectangle'; } } itemWidthExpr(obj, value) { if (value) { obj.Width = value; } else { return obj.Width || (obj.Type === 'group' && 1.5) || 1; } } itemHeightExpr(obj, value) { if (value) { obj.Height = value; } else { return obj.Height || (obj.Type === 'group' && 1) || 0.75; } } itemTextStyleExpr(obj) { if (obj.Level === 'senior') { return { 'font-weight': 'bold', 'text-decoration': 'underline' }; } return {}; } itemStyleExpr(obj) { const style: Record<string, string> = { stroke: '#444444' }; if (obj.Type === 'group') { style.fill = '#f3f3f3'; } return style; } linkStyleExpr(obj) { return { stroke: '#444444' }; } linkFromLineEndExpr(obj) { return 'none'; } linkToLineEndExpr(obj) { return 'none'; } } @NgModule({ imports: [ BrowserModule, BrowserTransferStateModule, HttpClientModule, DxDiagramModule, ], declarations: [AppComponent], bootstrap: [AppComponent], }) export class AppModule { } platformBrowserDynamic().bootstrapModule(AppModule);
::ng-deep #diagram { height: 900px; }
import { Injectable } from '@angular/core'; export class OrgItem { ID: string; Name: string; Type?: string; Level?: string; } export class OrgLink { ID: string; From: string; To: string; } const orgItems: OrgItem[] = [ { ID: '106', Name: 'Development', Type: 'group', }, { ID: '107', Name: 'WinForms\nTeam', Type: 'group', }, { ID: '108', Name: 'WPF\nTeam', Type: 'group', }, { ID: '109', Name: 'Javascript\nTeam', Type: 'group', }, { ID: '110', Name: 'ASP.NET\nTeam', Type: 'group', }, { ID: '112', Name: 'Ana\nTrujillo', Level: 'senior', }, { ID: '113', Name: 'Antonio\nMoreno', }, { ID: '115', Name: 'Christina\nBerglund', }, { ID: '116', Name: 'Hanna\nMoos', }, { ID: '119', Name: 'Laurence\nLebihan', }, { ID: '120', Name: 'Elizabeth\nLincoln', Level: 'senior', }, { ID: '122', Name: 'Patricio\nSimpson', Level: 'senior', }, { ID: '123', Name: 'Francisco\nChang', }, ]; const orgLinks: OrgLink[] = [ { ID: '124', From: '106', To: '108', }, { ID: '125', From: '106', To: '109', }, { ID: '126', From: '106', To: '107', }, { ID: '127', From: '106', To: '110', }, { ID: '129', From: '110', To: '112', }, { ID: '130', From: '110', To: '113', }, { ID: '132', From: '107', To: '115', }, { ID: '133', From: '107', To: '116', }, { ID: '136', From: '108', To: '119', }, { ID: '137', From: '108', To: '120', }, { ID: '139', From: '109', To: '122', }, { ID: '140', From: '109', To: '123', }, ]; @Injectable() export class Service { getOrgItems() { return orgItems; } getOrgLinks() { return orgLinks; } }
// 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.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, }, }, 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@12.2.17', '@angular/platform-browser': 'npm:@angular/platform-browser@12.2.17', '@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic@12.2.17', '@angular/forms': 'npm:@angular/forms@12.2.17', '@angular/common': 'npm:@angular/common@12.2.17', '@angular/compiler': 'npm:@angular/compiler@12.2.17', 'tslib': 'npm:tslib@2.6.2/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@1.28.1/build/global/luxon.min.js', 'es6-object-assign': 'npm:es6-object-assign@1.1.0', 'devextreme': 'npm:devextreme@23.2.5/cjs', 'devextreme/bundles/dx.all': 'npm:devextreme@23.2.5/bundles/dx.all.js', 'jszip': 'npm:jszip@3.10.1/dist/jszip.min.js', 'devextreme-quill': 'npm:devextreme-quill@1.6.4/dist/dx-quill.min.js', 'devexpress-diagram': 'npm:devexpress-diagram@2.2.5', 'devexpress-gantt': 'npm:devexpress-gantt@4.1.51', 'devextreme-angular': 'npm:devextreme-angular@23.2.5', '@devextreme/runtime': 'npm:@devextreme/runtime@3.0.12', 'inferno': 'npm:inferno@7.4.11/dist/inferno.min.js', 'inferno-compat': 'npm:inferno-compat/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/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', // Prettier 'prettier/standalone': 'npm:prettier@2.8.4/standalone.js', 'prettier/parser-html': 'npm:prettier@2.8.4/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@3.0.12/inferno/package.json', 'npm:@angular/*/package.json', 'npm:@angular/common@12.2.17/*/package.json', 'npm:rxjs@7.5.3/package.json', 'npm:rxjs@7.5.3/operators/package.json', 'npm:devextreme-angular@23.2.5/*/package.json', 'npm:devextreme-angular@23.2.5/ui/*/package.json', 'npm:devextreme-angular@23.2.5/package.json', 'npm:devexpress-diagram@2.2.5/package.json', 'npm:devexpress-gantt@4.1.51/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/23.2.5/css/dx-diagram.min.css" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/23.2.5/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@0.12.0/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>