OData and Virtual Data (Vue)

The ODataCollectionView class provides a simple way to connect controls to OData sources. When you create an ODataCollectionView, it starts loading the data in the source. The ODataVirtualCollectionView extends ODataCollectionView to provide on-demand loading of data. It does not load the data from the server automatically. Instead, it relies on the setWindow method to load data fragments (windows) on demand. The grids below show how both classes work. Notice how the grid on the left shows the data being loaded gradually. The grid on the right shows the full record count immediately, but the data will not be loaded until you scroll down.

This example uses Vue.

<template> <div class="container-fluid"> <div class="col-sm-6"> <h4>ODataCollectionView</h4> <p>{{itemCount}}</p> <wj-flex-grid :itemsSource="orderDetails" :isReadOnly="true" :initialized="gridInitialized" ></wj-flex-grid> </div> <div class="col-sm-6"> <h4>ODataVirtualCollectionView</h4> <p>{{totalItemCount}}</p> <wj-flex-grid :itemsSource="virtualOrderDetails" :isReadOnly="true" :initialized="virtualGridInitialized" ></wj-flex-grid> </div> </div> </template> <script> import "@grapecity/wijmo.styles/wijmo.css"; import "bootstrap.css"; import Vue from "vue"; import "@grapecity/wijmo.vue2.grid"; import * as wjcGrid from "@grapecity/wijmo.grid"; import * as wjcOData from "@grapecity/wijmo.odata"; import * as wjcCore from "@grapecity/wijmo"; let App = Vue.extend({ name: "app", data: function() { return { table: "Order_Details_Extendeds", orderDetails: new wjcOData.ODataCollectionView( "https://services.odata.org/Northwind/Northwind.svc", "Order_Details_Extendeds" ), virtualOrderDetails: new wjcOData.ODataVirtualCollectionView( "https://services.odata.org/Northwind/Northwind.svc", "Order_Details_Extendeds", { loaded: (sender, e) => { this.totalItemCount = wjcCore.format( "{totalItemCount:n0} items", sender ); } } ), itemCount: "", totalItemCount: "" }; }, methods: { gridInitialized: function(flexgrid) { this.flexgrid = flexgrid; flexgrid.formatItem.addHandler((s, e) => { // show row indices in row headers if (e.panel.cellType == wjcGrid.CellType.RowHeader) { e.cell.textContent = (e.row + 1).toString(); } }); flexgrid.loadedRows.addHandler((sender, e) => { this.itemCount = wjcCore.format( "{length:n0} items", sender.rows ); }); }, virtualGridInitialized: function(flexgrid) { this.flexgrid = flexgrid; flexgrid.formatItem.addHandler((s, e) => { // show row indices in row headers if (e.panel.cellType == wjcGrid.CellType.RowHeader) { e.cell.textContent = (e.row + 1).toString(); } }); flexgrid.scrollPositionChanged.addHandler(() => { let rng = flexgrid.viewRange; this.virtualOrderDetails.setWindow(rng.row, rng.row2); }); } } }); new Vue({ render: h => h(App) }).$mount("#app"); </script> <style> .wj-flexgrid { height: 350px; } .wj-cell { border-color: #e0e0e0; } .wj-cell.wj-has-notes:after { position: absolute; content: ""; width: 0; right: 0; top: -10px; border: 10px solid transparent; border-right: 10px solid red; opacity: 0.5; } .wj-cell.wj-has-notes:hover:after { opacity: 1; } body { margin-bottom: 24pt; } </style>
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>GrapeCity 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.vue'); </script> </head> <body> <div id="app"> </div> </body> </html>
(function (global) { System.config({ transpiler: 'plugin-babel', babelOptions: { es2015: true }, meta: { '*.css': { loader: 'css' }, '*.vue': { loader: 'vue-loader' } //'*.vue': { loader: 'systemjs-plugin-vue' } }, paths: { // paths serve as alias 'npm:': 'node_modules/' }, // map tells the System loader where to look for things map: { '@grapecity/wijmo': 'npm:@grapecity/wijmo/index.js', '@grapecity/wijmo.input': 'npm:@grapecity/wijmo.input/index.js', '@grapecity/wijmo.styles': 'npm:@grapecity/wijmo.styles', '@grapecity/wijmo.cultures': 'npm:@grapecity/wijmo.cultures', '@grapecity/wijmo.chart': 'npm:@grapecity/wijmo.chart/index.js', '@grapecity/wijmo.chart.analytics': 'npm:@grapecity/wijmo.chart.analytics/index.js', '@grapecity/wijmo.chart.animation': 'npm:@grapecity/wijmo.chart.animation/index.js', '@grapecity/wijmo.chart.annotation': 'npm:@grapecity/wijmo.chart.annotation/index.js', '@grapecity/wijmo.chart.finance': 'npm:@grapecity/wijmo.chart.finance/index.js', '@grapecity/wijmo.chart.finance.analytics': 'npm:@grapecity/wijmo.chart.finance.analytics/index.js', '@grapecity/wijmo.chart.hierarchical': 'npm:@grapecity/wijmo.chart.hierarchical/index.js', '@grapecity/wijmo.chart.interaction': 'npm:@grapecity/wijmo.chart.interaction/index.js', '@grapecity/wijmo.chart.radar': 'npm:@grapecity/wijmo.chart.radar/index.js', '@grapecity/wijmo.chart.render': 'npm:@grapecity/wijmo.chart.render/index.js', '@grapecity/wijmo.chart.webgl': 'npm:@grapecity/wijmo.chart.webgl/index.js', '@grapecity/wijmo.gauge': 'npm:@grapecity/wijmo.gauge/index.js', '@grapecity/wijmo.grid': 'npm:@grapecity/wijmo.grid/index.js', '@grapecity/wijmo.grid.detail': 'npm:@grapecity/wijmo.grid.detail/index.js', '@grapecity/wijmo.grid.filter': 'npm:@grapecity/wijmo.grid.filter/index.js', '@grapecity/wijmo.grid.search': 'npm:@grapecity/wijmo.grid.search/index.js', '@grapecity/wijmo.grid.grouppanel': 'npm:@grapecity/wijmo.grid.grouppanel/index.js', '@grapecity/wijmo.grid.multirow': 'npm:@grapecity/wijmo.grid.multirow/index.js', '@grapecity/wijmo.grid.transposed': 'npm:@grapecity/wijmo.grid.transposed/index.js', '@grapecity/wijmo.grid.pdf': 'npm:@grapecity/wijmo.grid.pdf/index.js', '@grapecity/wijmo.grid.sheet': 'npm:@grapecity/wijmo.grid.sheet/index.js', '@grapecity/wijmo.grid.xlsx': 'npm:@grapecity/wijmo.grid.xlsx/index.js', '@grapecity/wijmo.grid.selector': 'npm:@grapecity/wijmo.grid.selector/index.js', '@grapecity/wijmo.grid.cellmaker': 'npm:@grapecity/wijmo.grid.cellmaker/index.js', '@grapecity/wijmo.nav': 'npm:@grapecity/wijmo.nav/index.js', '@grapecity/wijmo.odata': 'npm:@grapecity/wijmo.odata/index.js', '@grapecity/wijmo.olap': 'npm:@grapecity/wijmo.olap/index.js', '@grapecity/wijmo.pdf': 'npm:@grapecity/wijmo.pdf/index.js', '@grapecity/wijmo.viewer': 'npm:@grapecity/wijmo.viewer/index.js', '@grapecity/wijmo.xlsx': 'npm:@grapecity/wijmo.xlsx/index.js', '@grapecity/wijmo.undo': 'npm:@grapecity/wijmo.undo/index.js', '@grapecity/wijmo.interop.grid': 'npm:@grapecity/wijmo.interop.grid/index.js', '@grapecity/wijmo.touch': 'npm:@grapecity/wijmo.touch/index.js', '@grapecity/wijmo.cloud': 'npm:@grapecity/wijmo.cloud/index.js', "@grapecity/wijmo.vue2.chart.analytics": "npm:@grapecity/wijmo.vue2.chart.analytics/index.js", "@grapecity/wijmo.vue2.chart.animation": "npm:@grapecity/wijmo.vue2.chart.animation/index.js", "@grapecity/wijmo.vue2.chart.annotation": "npm:@grapecity/wijmo.vue2.chart.annotation/index.js", "@grapecity/wijmo.vue2.chart.finance.analytics": "npm:@grapecity/wijmo.vue2.chart.finance.analytics/index.js", "@grapecity/wijmo.vue2.chart.finance": "npm:@grapecity/wijmo.vue2.chart.finance/index.js", "@grapecity/wijmo.vue2.chart.hierarchical": "npm:@grapecity/wijmo.vue2.chart.hierarchical/index.js", "@grapecity/wijmo.vue2.chart.interaction": "npm:@grapecity/wijmo.vue2.chart.interaction/index.js", "@grapecity/wijmo.vue2.chart.radar": "npm:@grapecity/wijmo.vue2.chart.radar/index.js", "@grapecity/wijmo.vue2.chart": 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"npm:@grapecity/wijmo.vue2.olap/index.js", "@grapecity/wijmo.vue2.viewer": "npm:@grapecity/wijmo.vue2.viewer/index.js", "@grapecity/wijmo.vue2.nav": "npm:@grapecity/wijmo.vue2.nav/index.js", "@grapecity/wijmo.vue2.base": "npm:@grapecity/wijmo.vue2.base/index.js", 'bootstrap.css': 'npm:bootstrap/dist/css/bootstrap.min.css', 'jszip': 'npm:jszip/dist/jszip.js', 'css': 'npm:systemjs-plugin-css/css.js', 'vue': 'npm:vue/dist/vue.min.js', 'vue-loader': 'npm:systemjs-vue-browser/index.js', //'systemjs-plugin-vue': 'npm:systemjs-plugin-vue/index.js', 'plugin-babel': 'npm:systemjs-plugin-babel/plugin-babel.js', 'systemjs-babel-build': 'npm:systemjs-plugin-babel/systemjs-babel-browser.js' }, // packages tells the System loader how to load when no filename and/or no extension packages: { src: { defaultExtension: 'js' }, rxjs: { defaultExtension: 'js' }, "node_modules": { defaultExtension: 'js' }, wijmo: { defaultExtension: 'js', } } }); })(this);