Event-Based Validation

The FlexGrid helps with validation in several ways.

Automatic Type Coercion, Data Maps, Event-Based Validation, and CollectionView-Based Validation.

The grid below demonstrates the three first items. It has a Country column with a data map that prevents users from entering invalid countries. The cellEditEnding event is used to ensure that the 'Sales' and 'Expenses' columns contain positive values.

import 'bootstrap.css'; import '@grapecity/wijmo.styles/wijmo.css'; import './styles.css'; import { FlexGrid } from '@grapecity/wijmo.grid'; import { changeType, DataType, isNumber } from '@grapecity/wijmo'; import '@grapecity/wijmo.input'; // document.readyState === 'complete' ? init() : window.onload = init; // function init() { // // create some random data var countries = 'US,Germany,UK,Japan,Italy,Greece'.split(','); var data = []; for (var i = 0; i < countries.length; i++) { data.push({ id: i, country: countries[i], sales: Math.random() * 10000, expenses: Math.random() * 5000, overdue: (i + 1) % 4 == 0 }); } // // event-based validation var theGrid = new FlexGrid('#theGrid', { itemsSource: data, columns: [ { binding: 'id', header: 'ID', width: 50, isReadOnly: true }, { binding: 'country', header: 'Country', isRequired: true, dataMap: countries }, { binding: 'sales', header: 'Sales', format: 'n2' }, { binding: 'expenses', header: 'Expenses', format: 'n2' }, { binding: 'overdue', header: 'Overdue' } ], cellEditEnding: function (s, e) { var col = s.columns[e.col]; if (col.binding == 'sales' || col.binding == 'expenses') { var value = changeType(s.activeEditor.value, DataType.Number, col.format); if (!isNumber(value) || value < 0) { e.cancel = true; e.stayInEditMode = true; alert('Please enter a positive amount.'); } } } }); }
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>GrapeCity Wijmo FlexGrid Validation</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> </div> </body> </html>
.wj-flexgrid { max-height: 200px; margin-bottom: 12px; } body { margin-bottom: 24px; }
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