DataMaps (React)

In many situations, you may want columns to map values so cells display a value that is different from what is actually stored in the grid. You can accomplish this with the formatItem event, but the FlexGrid provides a better alternative: DataMaps.

If you set a column's dataMap property to an instance of a DataMap, the grid will use it to look up display values for each data item, and will provide a drop-down list with valid items to use when editing the cells.

This example uses React.

import 'bootstrap.css'; import '@grapecity/wijmo.styles/wijmo.css'; import './app.css'; // import * as React from 'react'; import * as ReactDOM from 'react-dom'; import * as wjcGrid from '@grapecity/wijmo.grid'; import * as wjGrid from '@grapecity/wijmo.react.grid'; class App extends React.Component { constructor(props) { super(props); this.state = { data: null, customerMap: null, countries: 'US,Germany,UK,Japan,Sweden,Norway,Denmark'.split(','), customers: [ { id: 0, name: 'Paul Perkins', address: '123 Main St' }, { id: 1, name: 'Susan Smith', address: '456 Grand Ave' }, { id: 2, name: 'Joan Jett', address: '789 Broad St' }, { id: 3, name: 'Don Davis', address: '321 Shattuck Ave' }, ] }; } render() { return <div className="container-fluid"> <wjGrid.FlexGrid initialized={this.mainGridInitialized.bind(this)} itemsSource={this.state.data}> <wjGrid.FlexGridColumn header="Customer" binding="customer" width="1.5*" dataMap={this.state.customerMap}> </wjGrid.FlexGridColumn> <wjGrid.FlexGridColumn header="Country" binding="country" width="*" dataMap={this.state.countries}> </wjGrid.FlexGridColumn> <wjGrid.FlexGridColumn header="Downloads" binding="downloads" width="*" format="n0"> </wjGrid.FlexGridColumn> <wjGrid.FlexGridColumn header="Sales" binding="sales" width="*" format="n0"> </wjGrid.FlexGridColumn> <wjGrid.FlexGridColumn header="Expenses" binding="expenses" width="*" format="n0"> </wjGrid.FlexGridColumn> </wjGrid.FlexGrid> <p> And here is another grid showing all the customers. If you edit their names, you will see the change in the top grid: </p> <wjGrid.FlexGrid initialized={this.dataMapGridInitialized.bind(this)} itemsSource={this.state.customers}> </wjGrid.FlexGrid> </div>; } mainGridInitialized(mainGrid) { this.mainGrid = mainGrid; } dataMapGridInitialized(flexGrid) { var data = this.getData(); var customerMap = new wjcGrid.DataMap(this.state.customers, 'id', 'name'); var _this = this; flexGrid.rowEditEnded.addHandler(() => { let column = this.mainGrid.getColumn('customer'); if (column) { column.dataMap = new wjcGrid.DataMap(_this.state.customers, 'id', 'name'); } this.mainGrid.refresh(); // update customer names on the main grid }); this.setState({ data: data, customerMap: customerMap }); } getData() { let data = []; for (let i = 0; i < this.state.countries.length; i++) { data.push({ id: i, country: this.state.countries[i], customer: this.state.customers[i % this.state.customers.length].id, active: i % 5 != 0, downloads: Math.round(Math.random() * 200000), sales: Math.random() * 100000, expenses: Math.random() * 50000 }); } return data; } } ReactDOM.render(<App />, document.getElementById('app'));
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>GrapeCity Wijmo FlexGrid Column DataMaps</title> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <!-- SystemJS --> <script src="node_modules/systemjs/dist/system.src.js"></script> <script src="systemjs.config.js"></script> <script> System.import('./src/app'); </script> </head> <body> <div id="app"></div> </body> </html>
.wj-flexgrid { max-height: 200px; margin: 12px 0; }
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