Demos
Nav(React)
TreeView
Nodes
Custom Content

Custom Nodes (React)

You can customize the content of the TreeView nodes using the formatItem event. The event handler parameters include the element that represents the node and the data item being rendered. The example below uses the formatItem event to add a "new" badge to the right of new items on the tree.

Learn about Wijmo | TreeView Node Customization Documentation | TreeView API Reference

This example uses React.

JavaScript
Angular
Vue
React
app.jsx
index.html
app.css
data.jsx
Copy to CodeMine
import 'bootstrap.css';
import '@mescius/wijmo.styles/wijmo.css';
import ReactDOM from 'react-dom/client';
import React from 'react';
import useEvent from 'react-use-event-hook';
import * as wjCore from '@mescius/wijmo';
import * as wjNav from '@mescius/wijmo.react.nav';
import './app.css';
import { data } from './data';
function App() {
    const onFormatItem = useEvent((s, e) => {
        if (e.dataItem.newItem) {
            let img = wjCore.createElement('<img class="new-icon" src="resources/new.png">');
            e.element.appendChild(img);
        }
    });
    return (<div className="container-fluid">
      <wjNav.TreeView itemsSource={data} displayMemberPath="header" childItemsPath="items" showCheckboxes={true} checkedMemberPath="checked" formatItem={onFormatItem}/>
    </div>);
}
const container = document.getElementById('app');
if (container) {
    const root = ReactDOM.createRoot(container);
    root.render(<App />);
}
import 'bootstrap.css'; import '@mescius/wijmo.styles/wijmo.css'; import ReactDOM from 'react-dom/client'; import React from 'react'; import useEvent from 'react-use-event-hook'; import * as wjCore from '@mescius/wijmo'; import * as wjNav from '@mescius/wijmo.react.nav'; import './app.css'; import { data } from './data'; function App() { const onFormatItem = useEvent((s, e) => { if (e.dataItem.newItem) { let img = wjCore.createElement('<img class="new-icon" src="resources/new.png">'); e.element.appendChild(img); } }); return (<div className="container-fluid"> <wjNav.TreeView itemsSource={data} displayMemberPath="header" childItemsPath="items" showCheckboxes={true} checkedMemberPath="checked" formatItem={onFormatItem}/> </div>); } const container = document.getElementById('app'); if (container) { const root = ReactDOM.createRoot(container); root.render(<App />); }
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>MESCIUS Wijmo Wijmo TreeView Custom Node Content</title> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <!-- SystemJS --> <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.40/system.src.js" integrity="sha512-G6mEj6h18+m3MvzdviSDfPle/TfH0//cXcB33AKlNR/Rha0yQsKefDZKRTkIZos97HEGq2JMV1RT5ybMoQ3WsQ==" crossorigin="anonymous"></script> <script src="systemjs.config.js"></script> <script> System.import('./src/app'); </script> </head> <body> <div id="app"></div> </body> </html>
.new-icon { margin-left: 12px; transform: rotate(-30deg); } .container-fluid .wj-treeview { display: block; font-size: 120%; margin-bottom: 8px; padding: 6px; background: #f0f0f0; box-shadow: 0 3px 6px rgba(0, 0, 0, 0.16), 0 3px 6px rgba(0, 0, 0, 0.23); }
function getData() { return [ { header: 'Electronics', items: [ { header: 'Trimmers/Shavers' }, { header: 'Tablets' }, { header: 'Phones', items: [ { header: 'Apple' }, { header: 'Motorola', newItem: true, checked: true }, { header: 'Nokia', checked: true }, { header: 'Samsung' } ] }, { header: 'Speakers', newItem: true }, { header: 'Monitors' } ] }, { header: 'Toys', items: [ { header: 'Shopkins' }, { header: 'Train Sets' }, { header: 'Science Kit', newItem: true }, { header: 'Play-Doh' }, { header: 'Crayola' } ] }, { header: 'Home', items: [ { header: 'Coffee Maker' }, { header: 'Breadmaker', newItem: true }, { header: 'Solar Panel', newItem: true }, { header: 'Work Table' }, { header: 'Propane Grill' } ] } ]; } export const data = getData();
(function (global) { window.process = { env: { NODE_ENV: "production" } } System.config({ transpiler: 'plugin-babel', babelOptions: { es2015: true, react: true }, meta: { '*.css': { loader: 'css' } }, paths: { // paths serve as alias 'npm:': 'node_modules/' }, // map tells the System loader where to look for things map: { 'jszip': 'npm:jszip/dist/jszip.js', '@mescius/wijmo': 'npm:@mescius/wijmo/index.js', '@mescius/wijmo.input': 'npm:@mescius/wijmo.input/index.js', '@mescius/wijmo.styles': 'npm:@mescius/wijmo.styles', '@mescius/wijmo.cultures': 'npm:@mescius/wijmo.cultures', '@mescius/wijmo.chart': 'npm:@mescius/wijmo.chart/index.js', '@mescius/wijmo.chart.analytics': 'npm:@mescius/wijmo.chart.analytics/index.js', '@mescius/wijmo.chart.animation': 'npm:@mescius/wijmo.chart.animation/index.js', '@mescius/wijmo.chart.annotation': 'npm:@mescius/wijmo.chart.annotation/index.js', '@mescius/wijmo.chart.finance': 'npm:@mescius/wijmo.chart.finance/index.js', '@mescius/wijmo.chart.finance.analytics': 'npm:@mescius/wijmo.chart.finance.analytics/index.js', '@mescius/wijmo.chart.hierarchical': 'npm:@mescius/wijmo.chart.hierarchical/index.js', '@mescius/wijmo.chart.interaction': 'npm:@mescius/wijmo.chart.interaction/index.js', '@mescius/wijmo.chart.radar': 'npm:@mescius/wijmo.chart.radar/index.js', '@mescius/wijmo.chart.render': 'npm:@mescius/wijmo.chart.render/index.js', '@mescius/wijmo.chart.webgl': 'npm:@mescius/wijmo.chart.webgl/index.js', '@mescius/wijmo.chart.map': 'npm:@mescius/wijmo.chart.map/index.js', '@mescius/wijmo.gauge': 'npm:@mescius/wijmo.gauge/index.js', '@mescius/wijmo.grid': 'npm:@mescius/wijmo.grid/index.js', '@mescius/wijmo.grid.detail': 'npm:@mescius/wijmo.grid.detail/index.js', '@mescius/wijmo.grid.filter': 'npm:@mescius/wijmo.grid.filter/index.js', '@mescius/wijmo.grid.search': 'npm:@mescius/wijmo.grid.search/index.js', '@mescius/wijmo.grid.style': 'npm:@mescius/wijmo.grid.style/index.js', '@mescius/wijmo.grid.grouppanel': 'npm:@mescius/wijmo.grid.grouppanel/index.js', '@mescius/wijmo.grid.multirow': 'npm:@mescius/wijmo.grid.multirow/index.js', '@mescius/wijmo.grid.transposed': 'npm:@mescius/wijmo.grid.transposed/index.js', '@mescius/wijmo.grid.transposedmultirow': 'npm:@mescius/wijmo.grid.transposedmultirow/index.js', '@mescius/wijmo.grid.pdf': 'npm:@mescius/wijmo.grid.pdf/index.js', '@mescius/wijmo.grid.sheet': 'npm:@mescius/wijmo.grid.sheet/index.js', '@mescius/wijmo.grid.xlsx': 'npm:@mescius/wijmo.grid.xlsx/index.js', '@mescius/wijmo.grid.selector': 'npm:@mescius/wijmo.grid.selector/index.js', '@mescius/wijmo.grid.cellmaker': 'npm:@mescius/wijmo.grid.cellmaker/index.js', '@mescius/wijmo.grid.immutable': 'npm:@mescius/wijmo.grid.immutable/index.js', '@mescius/wijmo.touch': 'npm:@mescius/wijmo.touch/index.js', '@mescius/wijmo.cloud': 'npm:@mescius/wijmo.cloud/index.js', '@mescius/wijmo.nav': 'npm:@mescius/wijmo.nav/index.js', '@mescius/wijmo.odata': 'npm:@mescius/wijmo.odata/index.js', '@mescius/wijmo.olap': 'npm:@mescius/wijmo.olap/index.js', '@mescius/wijmo.rest': 'npm:@mescius/wijmo.rest/index.js', '@mescius/wijmo.pdf': 'npm:@mescius/wijmo.pdf/index.js', '@mescius/wijmo.pdf.security': 'npm:@mescius/wijmo.pdf.security/index.js', '@mescius/wijmo.viewer': 'npm:@mescius/wijmo.viewer/index.js', '@mescius/wijmo.xlsx': 'npm:@mescius/wijmo.xlsx/index.js', '@mescius/wijmo.undo': 'npm:@mescius/wijmo.undo/index.js', '@mescius/wijmo.interop.grid': 'npm:@mescius/wijmo.interop.grid/index.js', '@mescius/wijmo.barcode': 'npm:@mescius/wijmo.barcode/index.js', '@mescius/wijmo.barcode.common': 'npm:@mescius/wijmo.barcode.common/index.js', '@mescius/wijmo.barcode.composite': 'npm:@mescius/wijmo.barcode.composite/index.js', '@mescius/wijmo.barcode.specialized': 'npm:@mescius/wijmo.barcode.specialized/index.js', "@mescius/wijmo.react.chart.analytics": "npm:@mescius/wijmo.react.chart.analytics/index.js", "@mescius/wijmo.react.chart.animation": "npm:@mescius/wijmo.react.chart.animation/index.js", "@mescius/wijmo.react.chart.annotation": "npm:@mescius/wijmo.react.chart.annotation/index.js", "@mescius/wijmo.react.chart.finance.analytics": "npm:@mescius/wijmo.react.chart.finance.analytics/index.js", "@mescius/wijmo.react.chart.finance": "npm:@mescius/wijmo.react.chart.finance/index.js", "@mescius/wijmo.react.chart.hierarchical": "npm:@mescius/wijmo.react.chart.hierarchical/index.js", "@mescius/wijmo.react.chart.interaction": "npm:@mescius/wijmo.react.chart.interaction/index.js", "@mescius/wijmo.react.chart.radar": "npm:@mescius/wijmo.react.chart.radar/index.js", "@mescius/wijmo.react.chart": "npm:@mescius/wijmo.react.chart/index.js", "@mescius/wijmo.react.core": "npm:@mescius/wijmo.react.core/index.js", '@mescius/wijmo.react.chart.map': 'npm:@mescius/wijmo.react.chart.map/index.js', "@mescius/wijmo.react.gauge": "npm:@mescius/wijmo.react.gauge/index.js", "@mescius/wijmo.react.grid.detail": "npm:@mescius/wijmo.react.grid.detail/index.js", "@mescius/wijmo.react.grid.filter": "npm:@mescius/wijmo.react.grid.filter/index.js", "@mescius/wijmo.react.grid.grouppanel": "npm:@mescius/wijmo.react.grid.grouppanel/index.js", '@mescius/wijmo.react.grid.search': 'npm:@mescius/wijmo.react.grid.search/index.js', "@mescius/wijmo.react.grid.multirow": "npm:@mescius/wijmo.react.grid.multirow/index.js", "@mescius/wijmo.react.grid.sheet": "npm:@mescius/wijmo.react.grid.sheet/index.js", '@mescius/wijmo.react.grid.transposed': 'npm:@mescius/wijmo.react.grid.transposed/index.js', '@mescius/wijmo.react.grid.transposedmultirow': 'npm:@mescius/wijmo.react.grid.transposedmultirow/index.js', '@mescius/wijmo.react.grid.immutable': 'npm:@mescius/wijmo.react.grid.immutable/index.js', "@mescius/wijmo.react.grid": "npm:@mescius/wijmo.react.grid/index.js", "@mescius/wijmo.react.input": "npm:@mescius/wijmo.react.input/index.js", "@mescius/wijmo.react.olap": "npm:@mescius/wijmo.react.olap/index.js", "@mescius/wijmo.react.viewer": "npm:@mescius/wijmo.react.viewer/index.js", "@mescius/wijmo.react.nav": "npm:@mescius/wijmo.react.nav/index.js", "@mescius/wijmo.react.base": "npm:@mescius/wijmo.react.base/index.js", '@mescius/wijmo.react.barcode.common': 'npm:@mescius/wijmo.react.barcode.common/index.js', '@mescius/wijmo.react.barcode.composite': 'npm:@mescius/wijmo.react.barcode.composite/index.js', '@mescius/wijmo.react.barcode.specialized': 'npm:@mescius/wijmo.react.barcode.specialized/index.js', 'jszip': 'npm:jszip/dist/jszip.js', 'react': 'npm:react/index.js', 'react-dom': 'npm:react-dom/index.js', 'react-dom/client': 'npm:react-dom/client.js', "scheduler": "npm:scheduler/index.js", 'redux': 'npm:redux/dist/redux.min.js', 'react-redux': 'npm:react-redux/dist/react-redux.min.js', 'bootstrap.css': 'npm:bootstrap/dist/css/bootstrap.min.css', 'css': 'npm:systemjs-plugin-css/css.js', 'plugin-babel': 'npm:systemjs-plugin-babel/plugin-babel.js', 'systemjs-babel-build':'npm:systemjs-plugin-babel/systemjs-babel-browser.js', "react-use-event-hook": "npm:react-use-event-hook/dist/esm/useEvent.js", }, // packages tells the System loader how to load when no filename and/or no extension packages: { src: { defaultExtension: 'jsx' }, "node_modules": { defaultExtension: 'js' }, } }); })(this);