지연 로드 및 OData

이 예제는 TreeView 컨트롤을 사용하여 OData 소스의 계층 구조 데이터를 표시하는 방법을 보여 줍니다.

Wijmo 알아보기 | TreeView Lazy Loading Documentation | TreeView API Reference

import 'bootstrap.css'; import '@grapecity/wijmo.styles/wijmo.css'; import './styles.css'; import * as wjNav from '@grapecity/wijmo.nav'; import * as wjOdata from '@grapecity/wijmo.odata'; import * as wjCore from '@grapecity/wijmo'; // document.readyState === 'complete' ? init() : window.onload = init; // function init() { // // NorthWind service URL var nwindService = 'https://services.odata.org/Northwind/Northwind.svc'; // // create the tree var tree = new wjNav.TreeView('#theTree', { displayMemberPath: ['FullName', 'ShipName', 'Summary'], childItemsPath: ['Orders', 'Order_Details'], lazyLoadFunction: lazyLoadODataFunction, }); // // get employee list var view = new wjOdata.ODataCollectionView(nwindService, 'Employees', { fields: 'EmployeeID,FirstName,LastName'.split(','), loaded: function (s, e) { // // when the data is loaded, add FullName and Orders array to employees var items = s.items.map(function (employee) { employee.FullName = employee.FirstName + ' ' + employee.LastName; employee.Orders = []; // lazy-load orders }); // // populate the tree with the employees array tree.itemsSource = s.items; } }); // // lazy-load orders and details function lazyLoadODataFunction(node, callback) { switch (node.level) { // // load orders for an employee case 0: var url = 'Employees(' + node.dataItem.EmployeeID + ')/Orders'; var orders = new wjOdata.ODataCollectionView(nwindService, url, { fields: 'OrderID,ShipName,ShipCountry'.split(','), loaded: function () { var items = orders.items.map(function (e) { e.Order_Details = []; // lazy-order details return e; }); callback(items); } }); break; // // load extended details for an order case 1: var url = "Order_Details_Extendeds?$filter=OrderID eq " + node.dataItem.OrderID; var details = new wjOdata.ODataCollectionView(nwindService, url, { fields: 'ProductName,ExtendedPrice'.split(','), loaded: function () { var items = details.items.map(function (e) { e.Summary = wjCore.format('{ProductName}: {ExtendedPrice:c}', e); return e; }); callback(items); } }); break; // // default default: callback(null); } } }
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>MESCIUS Wijmo TreeView Lazy Loading OData</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="theTree"></div> </div> </body> </html>
/* level 0 nodes and deeper (employees...) */ .wj-treeview .wj-nodelist > .wj-node { font-weight: bold; } /* level 1 nodes and deeper (orders...) */ .wj-treeview .wj-nodelist > .wj-nodelist > .wj-node { font-weight: normal; font-size: 95%; color: darkblue; } /* level 2 nodes and deeper (order details...) */ .wj-treeview .wj-nodelist > .wj-nodelist > .wj-nodelist > .wj-node { font-size: 90%; color: darkslategrey; } /* default trees on this sample */ .wj-treeview { display:block; height: 350px; font-size: 120%; margin-top: 8px; margin-bottom: 8px; padding: 6px; background: #f0f0f0; box-shadow: 0 3px 6px rgba(0,0,0,0.16), 0 3px 6px rgba(0,0,0,0.23); } body { margin-bottom: 24pt; }
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