Demos
Grid(React)
Columns
Dynamic Columns

Dynamic Columns (React)

This sample demonstrates how to dynamically create FlexGrid columns based on a collection, ensuring that the FlexGrid stays in sync with the data model.

Key Features:

  • Dynamic Column Creation: An editor allows users to select which columns to display and define their order.

  • Synchronization: The collection used to define the columns dynamically updates the FlexGrid to reflect changes.

  • Two-Way Interaction: Any changes made to the FlexGrid, such as rearranging columns by dragging, are reflected back in the underlying collection.

This approach provides a flexible way to manage column layouts programmatically, ensuring consistency between the FlexGrid's state and the application's data model.

Learn about FlexGrid | ColumnCollection Documentation | FlexGrid 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 './app.css';
import ReactDOM from 'react-dom/client';
import React, { useRef, useState } from 'react';
import { FlexGrid, FlexGridColumn } from '@mescius/wijmo.react.grid';
import { ListBox } from '@mescius/wijmo.react.input';
import { CollectionView, toHeaderCase, ObservableArray } from '@mescius/wijmo';
import { gridData } from './data';
function App() {
    // data fields
    const fieldsAvailable = useRef(Object.keys(gridData[0]));
    const [data] = useState(new CollectionView(gridData));
    // listbox collection
    const [columnsAvailable] = useState(new CollectionView(fieldsAvailable.current));
    const [columns] = useState(new CollectionView([]));
    const [gridCols, setGridCols] = useState([]);
    const [listIndex, setListIndex] = useState(0);
    // Initialize the first 3 columns by default
    React.useEffect(() => {
        for (let i = 0; i < 3; i++) {
            columnsAvailable.moveCurrentToFirst();
            addColumn(columnsAvailable.currentItem);
        }
    }, []); // Runs once after the initial render
    const addColumn = (item) => {
        var item = columnsAvailable.currentItem, index = columns.currentPosition;
        if (item) {
            columnsAvailable.remove(item);
            columns.sourceCollection.splice(Math.max(0, index), 0, item);
            columns.moveCurrentTo(item);
            columns.refresh();
            //re-render component
            setGridCols(columns.sourceCollection.slice());
        }
    };
    const removeColumn = () => {
        var item = columns.currentItem, index = columnsAvailable.currentPosition;
        if (item) {
            columns.remove(item);
            columnsAvailable.sourceCollection.splice(Math.max(0, index), 0, item);
            columnsAvailable.moveCurrentTo(item);
            columnsAvailable.refresh();
            //re-render component
            setGridCols(columns.sourceCollection.slice());
        }
    };
    const moveColumn = (offset) => {
        var item = columns.currentItem;
        if (item) {
            var arr = columns.sourceCollection, index = arr.indexOf(item), newIndex = index + offset;
            if (index > -1 && newIndex > -1) {
                arr.splice(index, 1);
                arr.splice(newIndex, 0, item);
                columns.moveCurrentTo(item);
                columns.refresh();
            }
            //re-render component
            setGridCols(columns.sourceCollection.slice());
        }
    };
    const onDraggedColumn = (s) => {
        var _columns = new ObservableArray();
        for (var i = 0; i < s.columns.length; i++) {
            _columns.push(s.columns[i].binding);
        }
        columns.sourceCollection = _columns;
        setGridCols(_columns);
    };
    const columnHeaderCase = (col) => {
        return toHeaderCase(col);
    };
    const indexChanged = (s) => {
        // on index change,re-render component
        setListIndex(s.selectedIndex);
    };
    return (<div className="container-fluid">
      <div className="row">
        <div className="col-sm-4 col-md-4">
          <h3>Edit the ColumnCollection</h3>
          <div className="row">
            <div className="col-md-5">
              <ListBox itemsSource={columnsAvailable} className="wide"/>
            </div>
            <div className="col-md-2">
              <button type="button" className="btn btn-default btn-lg btn-block" disabled={columnsAvailable.itemCount == 0} onClick={() => addColumn(columnsAvailable.currentItem)}>
                <span className="wj-glyph-right"></span>
              </button>
              <button type="button" className="btn btn-default btn-lg btn-block" disabled={columns.itemCount == 0} onClick={removeColumn}>
                <span className="wj-glyph-left"></span>
              </button>
              <button type="button" className="btn btn-default btn-lg btn-block" disabled={columns.currentPosition <= 0} onClick={() => moveColumn(-1)}>
                <span className="wj-glyph-up"></span>
              </button>
              <button type="button" className="btn btn-default btn-lg btn-block" disabled={columns.currentPosition == columns.itemCount - 1} onClick={() => moveColumn(1)}>
                <span className="wj-glyph-down"></span>
              </button>
            </div>
            <div className="col-md-5">
              <ListBox itemsSource={columns} selectedIndexChanged={indexChanged} className="wide"/>
            </div>
          </div>
        </div>
        <div className="col-sm-8 col-md-8">
          <h3>See the result here</h3>
          <ul>
            {gridCols.map((col, index) => (<li key={index}>{columnHeaderCase(col)}</li>))}
          </ul>
          <FlexGrid itemsSource={data} className="wide" autoGenerateColumns={false} draggedColumn={onDraggedColumn}>
            {gridCols.map((col) => (<FlexGridColumn key={col} binding={col} header={columnHeaderCase(col)}/>))}
          </FlexGrid>
        </div>
      </div>
    </div>);
}
export default App;
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 './app.css'; import ReactDOM from 'react-dom/client'; import React, { useRef, useState } from 'react'; import { FlexGrid, FlexGridColumn } from '@mescius/wijmo.react.grid'; import { ListBox } from '@mescius/wijmo.react.input'; import { CollectionView, toHeaderCase, ObservableArray } from '@mescius/wijmo'; import { gridData } from './data'; function App() { // data fields const fieldsAvailable = useRef(Object.keys(gridData[0])); const [data] = useState(new CollectionView(gridData)); // listbox collection const [columnsAvailable] = useState(new CollectionView(fieldsAvailable.current)); const [columns] = useState(new CollectionView([])); const [gridCols, setGridCols] = useState([]); const [listIndex, setListIndex] = useState(0); // Initialize the first 3 columns by default React.useEffect(() => { for (let i = 0; i < 3; i++) { columnsAvailable.moveCurrentToFirst(); addColumn(columnsAvailable.currentItem); } }, []); // Runs once after the initial render const addColumn = (item) => { var item = columnsAvailable.currentItem, index = columns.currentPosition; if (item) { columnsAvailable.remove(item); columns.sourceCollection.splice(Math.max(0, index), 0, item); columns.moveCurrentTo(item); columns.refresh(); //re-render component setGridCols(columns.sourceCollection.slice()); } }; const removeColumn = () => { var item = columns.currentItem, index = columnsAvailable.currentPosition; if (item) { columns.remove(item); columnsAvailable.sourceCollection.splice(Math.max(0, index), 0, item); columnsAvailable.moveCurrentTo(item); columnsAvailable.refresh(); //re-render component setGridCols(columns.sourceCollection.slice()); } }; const moveColumn = (offset) => { var item = columns.currentItem; if (item) { var arr = columns.sourceCollection, index = arr.indexOf(item), newIndex = index + offset; if (index > -1 && newIndex > -1) { arr.splice(index, 1); arr.splice(newIndex, 0, item); columns.moveCurrentTo(item); columns.refresh(); } //re-render component setGridCols(columns.sourceCollection.slice()); } }; const onDraggedColumn = (s) => { var _columns = new ObservableArray(); for (var i = 0; i < s.columns.length; i++) { _columns.push(s.columns[i].binding); } columns.sourceCollection = _columns; setGridCols(_columns); }; const columnHeaderCase = (col) => { return toHeaderCase(col); }; const indexChanged = (s) => { // on index change,re-render component setListIndex(s.selectedIndex); }; return (<div className="container-fluid"> <div className="row"> <div className="col-sm-4 col-md-4"> <h3>Edit the ColumnCollection</h3> <div className="row"> <div className="col-md-5"> <ListBox itemsSource={columnsAvailable} className="wide"/> </div> <div className="col-md-2"> <button type="button" className="btn btn-default btn-lg btn-block" disabled={columnsAvailable.itemCount == 0} onClick={() => addColumn(columnsAvailable.currentItem)}> <span className="wj-glyph-right"></span> </button> <button type="button" className="btn btn-default btn-lg btn-block" disabled={columns.itemCount == 0} onClick={removeColumn}> <span className="wj-glyph-left"></span> </button> <button type="button" className="btn btn-default btn-lg btn-block" disabled={columns.currentPosition <= 0} onClick={() => moveColumn(-1)}> <span className="wj-glyph-up"></span> </button> <button type="button" className="btn btn-default btn-lg btn-block" disabled={columns.currentPosition == columns.itemCount - 1} onClick={() => moveColumn(1)}> <span className="wj-glyph-down"></span> </button> </div> <div className="col-md-5"> <ListBox itemsSource={columns} selectedIndexChanged={indexChanged} className="wide"/> </div> </div> </div> <div className="col-sm-8 col-md-8"> <h3>See the result here</h3> <ul> {gridCols.map((col, index) => (<li key={index}>{columnHeaderCase(col)}</li>))} </ul> <FlexGrid itemsSource={data} className="wide" autoGenerateColumns={false} draggedColumn={onDraggedColumn}> {gridCols.map((col) => (<FlexGridColumn key={col} binding={col} header={columnHeaderCase(col)}/>))} </FlexGrid> </div> </div> </div>); } export default App; 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 FlexGrid Dynamic Columns</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 { width: 100%; height: 400px; } .wj-listbox { width: 100%; height: 225px; } .btn-block{ min-width: 50px; }
const getData = (count) => { let data = [], countries = ['US', 'Germany', 'UK', 'Japan', 'Italy', 'Greece', 'Spain', 'Canada', 'Australia', 'China', 'Austria'], products = ['Widget', 'Gadget', 'Doohickey'], colors = ['Black', 'White', 'Red', 'Green', 'Blue'], dt = new Date(); for (let i = 0; i < count; i++) { data.push({ id: i, date: new Date(dt.getFullYear(), i % 12, 25, i % 24, i % 60, i % 60), country: countries[Math.floor(Math.random() * countries.length)], product: products[Math.floor(Math.random() * products.length)], color: colors[Math.floor(Math.random() * colors.length)], amount: Math.random() * 10000 - 5000, discount: Math.random() / 4, active: i % 4 == 0, }); } return data; }; export const gridData = getData(50);
(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);