OData 및 가상 데이터

ODataCollectionView 클래스는 컨트롤을 OData 소스에 연결하는 간단한 방법을 제공합니다. ODataCollectionView를 만들면 소스의 데이터를 로드하기 시작합니다. ODataVirtualCollectionViewODataCollectionView를 확장하여 요청 시 데이터 로드 기능을 제공합니다. 서버의 데이터를 자동으로 로드하지 않습니다. 대신, setWindow 메서드를 사용하여 요청 시 데이터 조각(창)을 로드합니다. 아래 그리드는 두 클래스의 작동 방식을 모두 보여 줍니다. 왼쪽 그리드에서 데이터가 어떻게 점진적으로 로드되는지를 확인합니다. 오른쪽 그리드에는 전체 레코드 수가 즉시 표시되지만, 아래로 스크롤할 때까지 데이터가 로드되지 않습니다.

import 'bootstrap.css'; import '@grapecity/wijmo.styles/wijmo.css'; import './styles.css'; import { format } from '@grapecity/wijmo'; import { ODataCollectionView, ODataVirtualCollectionView } from '@grapecity/wijmo.odata'; import { FlexGrid, CellType } from '@grapecity/wijmo.grid'; document.readyState === 'complete' ? init() : window.onload = init; function init() { // get order details into an ODataCollectionView var url = 'https://services.odata.org/Northwind/Northwind.svc'; var table = 'Order_Details_Extendeds'; var orderDetails = new ODataCollectionView(url, table); // show the data on a grid var itemCountElement = document.getElementById('itemCount'); var theGrid = new FlexGrid('#theGrid', { itemsSource: orderDetails, isReadOnly: true, formatItem: function (s, e) { if (e.panel.cellType == CellType.RowHeader) { e.cell.textContent = e.row + 1; } }, loadedRows: function (sender, e) { var el = document.getElementById('itemCount'); el.innerHTML = format('{length:n0} items', sender.rows); } }); // get order details into a ODataVirtualCollectionView var virtualDetails = new ODataVirtualCollectionView(url, table, { loaded: function (sender, e) { var el = document.getElementById('totalItemCount'); el.innerHTML = format('{totalItemCount:n0} items', sender); } }); // show the data on a grid var theVirtualGrid = new FlexGrid('#theVirtualGrid', { itemsSource: virtualDetails, isReadOnly: true, formatItem: function (s, e) { if (e.panel.cellType == CellType.RowHeader) { e.cell.textContent = e.row + 1; } }, scrollPositionChanged: function () { var rng = theVirtualGrid.viewRange; virtualDetails.setWindow(rng.row, rng.row2); } }); }
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>MESCIUS Wijmo FlexGrid OData and Virtual OData Binding</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 class="row"> <div class="col-sm-6"> <h4>ODataCollectionView</h4> <p id="itemCount"></p> <div id="theGrid"></div> </div> <div class="col-sm-6"> <h4>ODataVirtualCollectionView</h4> <p id="totalItemCount"></p> <div id="theVirtualGrid"></div> </div> </div> </div> </body> </html>
.wj-flexgrid { height: 300px; } .wj-flexgrid .wj-rowheaders .wj-cell { font-size: 80%; padding-top: .5em; } body { margin-bottom: 20pt; }
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