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.

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Backend API

import React from 'react'; import Diagram, { Nodes, AutoLayout, Edges, Toolbox, Group, } from 'devextreme-react/diagram'; import ArrayStore from 'devextreme/data/array_store'; import service from './data.js'; class App extends React.Component { constructor(props) { super(props); this.orgItemsDataSource = new ArrayStore({ key: 'id', data: service.getOrgItems(), }); this.orgLinksDataSource = new ArrayStore({ key: 'id', data: service.getOrgLinks(), }); } render() { return ( <Diagram id="diagram"> <Nodes dataSource={this.orgItemsDataSource} typeExpr={this.itemTypeExpr} textExpr="name" widthExpr={this.itemWidthExpr} heightExpr={this.itemHeightExpr} textStyleExpr={this.itemTextStyleExpr} styleExpr={this.itemStyleExpr}> <AutoLayout type="tree" orientation="horizontal" /> </Nodes> <Edges dataSource={this.orgLinksDataSource} styleExpr={this.linkStyleExpr} fromLineEndExpr={this.linkFromLineEndExpr} toLineEndExpr={this.linkToLineEndExpr} /> <Toolbox> <Group category="general" title="General" /> </Toolbox> </Diagram> ); } itemTypeExpr(obj, value) { if (value) { obj.type = (value === 'rectangle') ? undefined : 'group'; } else { return obj.type === 'group' ? 'ellipse' : 'rectangle'; } return null; } itemWidthExpr(obj, value) { if (value) { obj.width = value; } else { return obj.width || (obj.type === 'group' && 1.5) || 1; } return null; } itemHeightExpr(obj, value) { if (value) { obj.height = value; } else { return obj.height || (obj.type === 'group' && 1) || 0.75; } return null; } itemTextStyleExpr(obj) { if (obj.level === 'senior') { return { 'font-weight': 'bold', 'text-decoration': 'underline' }; } return {}; } itemStyleExpr(obj) { const style = { stroke: '#444444' }; if (obj.type === 'group') { style.fill = '#f3f3f3'; } return style; } linkStyleExpr() { return { stroke: '#444444' }; } linkFromLineEndExpr() { return 'none'; } linkToLineEndExpr() { return 'none'; } } export default App;

import React from 'react'; import ReactDOM from 'react-dom'; import App from './App.js'; ReactDOM.render( <App />, document.getElementById('app'), );

<!DOCTYPE html> <html> <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/23.1.5/css/dx.light.css" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/23.1.5/css/dx-diagram.css" /> <link rel="stylesheet" type="text/css" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.6.3/css/font-awesome.min.css" /> <link rel="stylesheet" type="text/css" href="styles.css" /> <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.js"); </script> </head> <body class="dx-viewport"> <div class="demo-container"> <div id="app"></div> </div> </body> </html>

#diagram { height: 900px; }