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Tree List

Focused Row

Documentation

This example demonstrates a TreeList widget that supports focused rows. The focusedRowKey option specifies the focused row. The onFocusedRowChanged callback function can be used to display additional information below the TreeList when the focused row changes. The focusedRowEnabled option enables row focusing.

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import React from 'react'; import TreeList, { Column, Lookup } from 'devextreme-react/tree-list'; import { NumberBox } from 'devextreme-react/number-box'; import * as AspNetData from 'devextreme-aspnet-data-nojquery'; const url = 'https://js.devexpress.com/Demos/Mvc/api/TreeListTasks', dataSourceOptions = AspNetData.createStore({ key: 'Task_ID', loadUrl: `${url }/Tasks`, onBeforeSend: function(_, ajaxOptions) { ajaxOptions.xhrFields = { withCredentials: true }; } }), customersData = AspNetData.createStore({ key: 'ID', loadUrl: `${url }/TaskEmployees` }); class App extends React.Component { constructor(props) { super(props); this.state = { taskSubject: '', taskAssigned: '', startDate: '', taskStatus: '', taskProgress: '', focusedRowKey: 4 }; this.onFocusedRowChanged = this.onFocusedRowChanged.bind(this); this.onTaskIdChanged = this.onTaskIdChanged.bind(this); } onTaskIdChanged(e) { if(e.event && e.value > 0) { this.setState({ focusedRowKey: e.value }); } } onFocusedRowChanged(e) { var rowData = e.row && e.row.data, progress, assignedToData = e.component.columnOption('Task_Assigned_Employee_ID').lookup.items[e.rowIndex]; if(rowData) { progress = rowData.Task_Completion ? `${rowData.Task_Completion }%` : '', this.setState({ taskSubject: rowData.Task_Subject, taskAssigned: assignedToData.Name, startDate: new Date(rowData.Task_Start_Date).toLocaleDateString(), taskStatus: e.row.data.Task_Status, taskProgress: progress, focusedRowKey: e.component.option('focusedRowKey') }); } } render() { return ( <div> <TreeList id={'treeList'} dataSource={dataSourceOptions} focusedRowEnabled={true} focusedRowKey={this.state.focusedRowKey} parentIdExpr={'Task_Parent_ID'} hasItemsExpr={'Has_Items'} wordWrapEnabled={true} showBorders={true} onFocusedRowChanged={this.onFocusedRowChanged}> <Column dataField={'Task_ID'} width={100} alignment={'left'} /> <Column dataField={'Task_Assigned_Employee_ID'} caption={'Assigned'} minWidth={120}> <Lookup dataSource={customersData} valueExpr={'ID'} displayExpr={'Name'} /> </Column> <Column dataField={'Task_Status'} caption={'Status'} width={160} /> <Column dataField={'Task_Start_Date'} caption={'Start Data'} dataType={'date'} width={160} /> <Column dataField={'Task_Due_Date'} caption={'Due Data'} dataType={'date'} width={160} /> </TreeList> { <div className={'task-info'}> <div className={'info'}> <div className={'task-subject'}>{this.state.taskSubject}</div> <span className={'task-assigned'}>{this.state.taskAssigned}</span> <span className={'start-date'}>{this.state.startDate}</span> </div> <div className={'progress'}> <span className={'task-status'}>{this.state.taskStatus}</span> <span className={'task-progress'}>{this.state.taskProgress}</span> </div> </div> } <div className={'options'}> <div className={'caption'}>Options</div> <div className={'option'}> <span>Focused row key </span> <NumberBox id={'taskId'} min={1} max={182} step={0} value={this.state.focusedRowKey} onValueChanged={this.onTaskIdChanged}> </NumberBox> </div> </div> </div> ); } } 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/18.2.7/css/dx.common.css" /> <link rel="dx-theme" data-theme="generic.light" href="https://cdn3.devexpress.com/jslib/18.2.7/css/dx.light.css" /> <link rel="stylesheet" type ="text/css" href ="styles.css" /> <script src="https://unpkg.com/core-js@2.4.1/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>
#treeList { max-height: 400px; } .task-info { font-family: Segoe UI; min-height: 100px; display: flex; flex-wrap: nowrap; border: 2px solid rgba(0, 0, 0, 0.1); padding: 16px; box-sizing: border-box; align-items: center; justify-content: space-between; } .info { display: flex; flex-direction: column; } .task-subject { line-height: 29px; font-size: 18px; font-weight: bold; } .progress { display: flex; flex-direction: column; white-space: pre; min-width: 105px; } .task-progress { line-height: 42px; font-size: 40px; font-weight: bold; } .options { margin-top: 20px; padding: 20px; background-color: rgba(191, 191, 191, 0.15); position: relative; } .caption { font-size: 18px; font-weight: 500; } .option { margin-top: 10px; } .option > .dx-numberbox { width: 200px; display: inline-block; vertical-align: middle; } .option > span { margin-right: 10px; }
System.config({ transpiler: 'plugin-babel', paths: { 'npm:': 'https://unpkg.com/' }, defaultExtension: 'js', meta: { 'devextreme-aspnet-data-nojquery': { 'esModule': true } }, map: { 'react': 'npm:react@16/umd/react.development.js', 'react-dom': 'npm:react-dom@16/umd/react-dom.development.js', 'prop-types': 'npm:prop-types/prop-types.js', 'devextreme': 'npm:devextreme@18.2', 'devextreme-react': 'npm:devextreme-react@18.2', 'jszip': 'npm:jszip@3.1.3/dist/jszip.min.js', 'quill': 'npm:quill@1.3.6/dist/quill.js', 'devextreme-aspnet-data-nojquery': 'npm:devextreme-aspnet-data-nojquery@2.0.0', // SystemJS plugins 'plugin-babel': 'npm:systemjs-plugin-babel@0/plugin-babel.js', 'systemjs-babel-build': 'npm:systemjs-plugin-babel@0/systemjs-babel-browser.js' }, packages: { 'devextreme': { defaultExtension: 'js' }, 'devextreme-react': { main: 'index.js' } }, babelOptions: { sourceMaps: false, stage0: true, react: true } });