DataMaps

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.

import 'bootstrap.css'; import '@grapecity/wijmo.styles/wijmo.css'; import './styles.css'; import '@grapecity/wijmo.input'; import { FlexGrid, DataMap } from '@grapecity/wijmo.grid'; document.readyState === 'complete' ? init() : window.onload = init; function init() { // create some random data var countries = 'US,Germany,UK,Japan,Sweden,Norway,Denmark'.split(','); var 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' }, ]; var data = []; for (var i = 0; i < countries.length; i++) { data.push({ id: i, country: countries[i], customer: customers[i % customers.length].id, active: i % 5 != 0, downloads: Math.round(Math.random() * 200000), sales: Math.random() * 100000, expenses: Math.random() * 50000 }); } // create customer data map var customerMap = new DataMap(customers, 'id', 'name'); // show the data in a grid var theGrid = new FlexGrid('#theGrid', { alternatingRowStep: 0, autoGenerateColumns: false, columns: [ { binding: 'customer', header: 'Customer', width: '1.5*', dataMap: customerMap }, { binding: 'country', header: 'Country', width: '*', dataMap: countries }, { binding: 'downloads', header: 'Downloads', width: '*', format: 'n0' }, { binding: 'sales', header: 'Sales', width: '*', format: 'n0' }, { binding: 'expenses', header: 'Expenses', width: '*', format: 'n0' } ], itemsSource: data, }); // show customers as well var theGridCustomers = new FlexGrid('#theGridCustomers', { itemsSource: customers, rowEditEnded: function () { let column = theGrid.getColumn('customer'); if (column) { column.dataMap = new DataMap(customers, 'id', 'name'); } theGrid.refresh(); // update customer names on the main grid } }); }
<!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 class="container-fluid"> <div id="theGrid"> </div> <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> <div id="theGridCustomers"> </div> </div> </body> </html>
.wj-flexgrid { max-height: 200px; margin: 12px 0; }
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