Adding and Removing Rows (React)

In most cases, you won't have to write code to add or remove rows from the FlexGrid control. FlexGrid has three properties, allowAddNew, allowDelete and newRowAtTop that affect adding and removing rows from the grid.

allowAddNew: Setting this property to true causes the grid to show a new row 'template' at the bottom of the grid.

allowDelete: Setting this property to true causes the grid to remove selected rows when the user presses the 'Delete' key.

newRowAtTop: Setting this property to true causes the grid to show the new row template at the top of the grid rather than the bottom.

You can see all of these properties in action in the sample below.

Learn about FlexGrid | Adding and Removing Rows Documentation | FlexGrid API Reference

This example uses React.

import 'bootstrap.css'; import '@mescius/wijmo.styles/wijmo.css'; import ReactDOM from 'react-dom/client'; import React, { useRef, useState } from 'react'; import useEvent from 'react-use-event-hook'; import * as wjcGrid from '@mescius/wijmo.react.grid'; import './app.css'; import { data } from './data'; function App() { const [grid, setGrid] = useState({ data: null, newRowAtTop: false, instance: null }); const gridRef = useRef(null); const initData = useEvent((grid) => { setGrid(Object.assign(Object.assign({}, grid), { instance: grid, data })); }); const onValueChanged = (evt) => { grid.instance.newRowAtTop = evt.target.checked; }; return (<div className="container-fluid"> <label> newRowAtTop <input onChange={onValueChanged} type="checkbox"/> </label> <wjcGrid.FlexGrid initialized={initData} allowAddNew={true} allowDelete={true} itemsSource={grid.data} newRowAtTo={grid.newRowAtTop}/> </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 FlexGrid Adding and Removing Rows</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>
.wj-flexgrid { height: 200px; margin: 10px 0; }
function getData() { let countries = ['US', 'Germany', 'UK', 'Japan', 'Italy', 'Greece'], data = []; for (let i = 0; i < countries.length; i++) { data.push({ id: i, country: countries[i], downloads: Math.round(Math.random() * 20000), sales: Math.random() * 10000, expenses: Math.random() * 5000 }); } return data; } export const data = getData();
(function (global) { 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': 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"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);