Demos
Nav(React)
TreeView
Nodes
Refreshing

Refreshing Nodes (React)

Refresh a TreeNode after its data has changed by call the node's refresh method. This sample demonstrates doing this in comparison to reloading the entire tree.

Learn about Wijmo | 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, { useRef } from 'react';
import useEvent from 'react-use-event-hook';
import * as wjNav from '@mescius/wijmo.react.nav';
import './app.css';
import { data } from './data';
function App() {
    const controlRef = useRef(null);
    const initialized = useEvent((sender) => {
        controlRef.current = sender;
        controlRef.current.selectedItem = controlRef.current.itemsSource[0];
    });
    const onItemDataClick = () => {
        controlRef.current.selectedNode.refresh({
            header: 'given itemData ' + Date.now(),
            items: [
                { header: 'first child' },
                { header: 'second child' }
            ]
        });
    };
    const onItemSourceClick = () => {
        let node = controlRef.current.selectedNode, arr = node.itemsSource;
        //
        arr[node.index] = {
            header: 'updated itemData ' + Date.now(),
            items: [
                { header: 'first child' },
                { header: 'second child' }
            ]
        };
        //
        node.refresh();
    };
    const onReloadClick = () => {
        controlRef.current.loadTree(true);
        controlRef.current.selectedItem = controlRef.current.itemsSource[0];
    };
    return (<div className="container-fluid">
      <div className="row">
        <div className="col-xs-6">
          <wjNav.TreeView itemsSource={data} displayMemberPath="header" childItemsPath="items" initialized={initialized}/>
        </div>
        <div className="col-xs-6">
          <button className="btn btn-default" onClick={onItemDataClick}>Refresh with given item data</button>
          <br />
          <button className="btn btn-default" onClick={onItemSourceClick}>Refresh with changed itemsSource</button>
          <br />
          <button className="btn btn-default" onClick={onReloadClick}>Re-load the TreeView</button>
        </div>
      </div>
    </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, { useRef } from 'react'; import useEvent from 'react-use-event-hook'; import * as wjNav from '@mescius/wijmo.react.nav'; import './app.css'; import { data } from './data'; function App() { const controlRef = useRef(null); const initialized = useEvent((sender) => { controlRef.current = sender; controlRef.current.selectedItem = controlRef.current.itemsSource[0]; }); const onItemDataClick = () => { controlRef.current.selectedNode.refresh({ header: 'given itemData ' + Date.now(), items: [ { header: 'first child' }, { header: 'second child' } ] }); }; const onItemSourceClick = () => { let node = controlRef.current.selectedNode, arr = node.itemsSource; // arr[node.index] = { header: 'updated itemData ' + Date.now(), items: [ { header: 'first child' }, { header: 'second child' } ] }; // node.refresh(); }; const onReloadClick = () => { controlRef.current.loadTree(true); controlRef.current.selectedItem = controlRef.current.itemsSource[0]; }; return (<div className="container-fluid"> <div className="row"> <div className="col-xs-6"> <wjNav.TreeView itemsSource={data} displayMemberPath="header" childItemsPath="items" initialized={initialized}/> </div> <div className="col-xs-6"> <button className="btn btn-default" onClick={onItemDataClick}>Refresh with given item data</button> <br /> <button className="btn btn-default" onClick={onItemSourceClick}>Refresh with changed itemsSource</button> <br /> <button className="btn btn-default" onClick={onReloadClick}>Re-load the TreeView</button> </div> </div> </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 Refreshing Nodes</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>
.container-fluid .wj-treeview { font-size: 120%; margin-top: 8px; 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: 'Parent 1', items: [ { header: 'Child 1.1' }, { header: 'Child 1.2' }, { header: 'Child 1.3' } ] }, { header: 'Parent 2', items: [ { header: 'Child 2.1' }, { header: 'Child 2.2' } ] }, { header: 'Parent 3', items: [ { header: 'Child 3.1' } ] } ]; } export const data = getData();
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'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);