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Advanced Data Binding

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
<template> <DxDiagram id="diagram" ref="diagram" > <DxNodes :data-source="orgItemsDataSource" :type-expr="itemTypeExpr" :text-expr="'name'" :width-expr="itemWidthExpr" :height-expr="itemHeightExpr" :text-style-expr="itemTextStyleExpr" :style-expr="itemStyleExpr" > <DxAutoLayout :type="'tree'" :orientation="'horizontal'" /> </DxNodes> <DxEdges :data-source="orgLinksDataSource" :from-line-end-expr="linkFromLineEndExpr" :to-line-end-expr="linkToLineEndExpr" :style-expr="linkStyleExpr" /> <DxToolbox> <DxGroup :category="'general'" :title="'General'" /> </DxToolbox> </DxDiagram> </template> <script setup lang="ts"> import { DxDiagram, DxNodes, DxAutoLayout, DxEdges, DxToolbox, DxGroup, } from 'devextreme-vue/diagram'; import ArrayStore from 'devextreme/data/array_store'; import service from './data.ts'; const orgItemsDataSource = new ArrayStore({ key: 'id', data: service.getOrgItems(), }); const orgLinksDataSource = new ArrayStore({ key: 'id', data: service.getOrgLinks(), }); const linkStyleExpr = () => ({ stroke: '#444444' }); const linkFromLineEndExpr = () => 'none'; const linkToLineEndExpr = () => 'none'; const itemTextStyleExpr = (obj) => (obj.level === 'senior' ? { 'font-weight': 'bold', 'text-decoration': 'underline' } : {} ); const itemStyleExpr = ({ type }) => ({ stroke: '#444444', ...(type === 'group' ? { fill: '#f3f3f3' } : {}), }); function itemTypeExpr(obj, value) { if (value) { obj.type = (value === 'rectangle') ? undefined : 'group'; } else { return obj.type === 'group' ? 'ellipse' : 'rectangle'; } return null; } function itemWidthExpr(obj, value) { if (value) { obj.width = value; } else { return obj.width || (obj.type === 'group' && 1.5) || 1; } return null; } function itemHeightExpr(obj, value) { if (value) { obj.height = value; } else { return obj.height || (obj.type === 'group' && 1) || 0.75; } return null; } </script> <style scoped> #diagram { height: 900px; } </style>
window.exports = window.exports || {}; window.config = { transpiler: 'plugin-babel', meta: { '*.vue': { loader: 'vue-loader', }, '*.ts': { loader: 'demo-ts-loader', }, '*.svg': { loader: 'svg-loader', }, 'devextreme/time_zone_utils.js': { 'esModule': true, }, 'devextreme/localization.js': { 'esModule': true, }, 'devextreme/viz/palette.js': { 'esModule': true, }, }, paths: { 'root:': '../../../../', 'npm:': 'https://unpkg.com/', }, map: { 'vue': 'npm:vue@3.2.47/dist/vue.esm-browser.js', 'vue-loader': 'npm:dx-systemjs-vue-browser@1.1.1/index.js', 'demo-ts-loader': 'root:utils/demo-ts-loader.js', 'svg-loader': 'root:utils/svg-loader.js', 'mitt': 'npm:mitt/dist/mitt.umd.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@24.1.4/cjs', 'devextreme-vue': 'npm:devextreme-vue@24.1.4/cjs', 'jszip': 'npm:jszip@3.10.1/dist/jszip.min.js', 'devextreme-quill': 'npm:devextreme-quill@1.7.1/dist/dx-quill.min.js', 'devexpress-diagram': 'npm:devexpress-diagram@2.2.10/dist/dx-diagram.js', 'devexpress-gantt': 'npm:devexpress-gantt@4.1.56/dist/dx-gantt.js', '@devextreme/runtime': 'npm:@devextreme/runtime@3.0.13', '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', 'plugin-babel': 'npm:systemjs-plugin-babel@0.0.25/plugin-babel.js', 'systemjs-babel-build': 'npm:systemjs-plugin-babel@0.0.25/systemjs-babel-browser.js', // Prettier 'prettier/standalone': 'npm:prettier@2.8.8/standalone.js', 'prettier/parser-html': 'npm:prettier@2.8.8/parser-html.js', }, packages: { 'devextreme-vue': { main: 'index.js', }, '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@3.0.13/inferno/package.json', ], babelOptions: { sourceMaps: false, stage0: true, }, }; System.config(window.config);
const orgItems = [ { 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 = [ { 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', }, ]; export default { getOrgItems() { return orgItems; }, getOrgLinks() { return orgLinks; }, };
import { createApp } from 'vue'; import App from './App.vue'; createApp(App).mount('#app');
<!DOCTYPE html> <html 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/24.1.4/css/dx-diagram.min.css" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/24.1.4/css/dx.light.css" /> <link rel="stylesheet" type="text/css" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.6.3/css/font-awesome.min.css" /> <script src="https://unpkg.com/typescript@4.9.5/lib/typescript.js"></script> <script type="module"> import * as vueCompilerSFC from "https://unpkg.com/@vue/compiler-sfc@3.4.16/dist/compiler-sfc.esm-browser.js"; window.vueCompilerSFC = vueCompilerSFC; </script> <script src="https://unpkg.com/core-js@2.6.12/client/shim.min.js"></script> <script src="https://unpkg.com/systemjs@0.21.3/dist/system.js"></script> <script type="text/javascript" src="config.js"></script> <script type="text/javascript"> System.import("./index.ts"); </script> </head> <body class="dx-viewport"> <div class="demo-container"> <div id="app"> </div> </div> </body> </html>