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DataGrid

Real-Time Updates

The DataGrid widget is optimized for real-time updates. You should bind it to a DataSource that contains a store and use the push(changes) method to update the store's data. The rows with changed data are rerendered (see the DataGrid's repaintChangesOnly option). The DataSource object also provides options that control its behavior when it receives a push. For example, reshapeOnPush is set to true in this demo to allow summaries to be recalculated.

Grids in the detail sections are updated in real time as well. All the grids share the same ordersStore that receives pushes, but it is filtered to show only a specific product's orders for each grid.

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$(function() { $("#grid-container").dxDataGrid({ dataSource: { store: productsStore, reshapeOnPush: true }, repaintChangesOnly: true, columnAutoWidth: true, showBorders: true, paging: { pageSize: 10 }, columns: [ { dataField: "ProductName", dataType: "string" }, { dataField: "UnitPrice", dataType: "number", format: "currency" }, { dataField: "OrderCount", dataType: "number" }, { dataField: "Quantity", dataType: "number" }, { dataField: "Amount", dataType: "number", format: "currency", allowSorting: true } ], summary: { totalItems: [{ summaryType: "count", column: "ProductName" }, { summaryType: "sum", displayFormat: "{0}", valueFormat: "currency", column: "Amount" }, { summaryType: "sum", displayFormat: "{0}", column: "OrderCount" }] }, masterDetail: { enabled: true, template: function(container, options) { $("<div>").appendTo(container).dxDataGrid({ dataSource: { store: ordersStore, filter: ["ProductID", "=", options.key], reshapeOnPush: true }, repaintChangesOnly: true, columnAutoWidth: true, showBorders: true, paging: { pageSize: 5 }, columns: [{ dataField: "OrderID", dataType: "number" }, { dataField: "ShipCity", dataType: "string" }, { dataField: "OrderDate", dataType: "datetime", format: "yyyy/MM/dd HH:mm:ss" }, { dataField: "UnitPrice", dataType: "number" }, { dataField: "Quantity", dataType: "number" }, { caption: "Amount", dataType: "number", format: "currency", allowSorting: true, calculateCellValue: function(rowData) { return rowData.UnitPrice * rowData.Quantity; } }], summary: { totalItems: [{ summaryType: "count", column: "OrderID" }, { summaryType: "sum", displayFormat: "{0}", column: "Quantity" }, { summaryType: "sum", displayFormat: "{0}", valueFormat: "currency", column: "Amount" }] } }); } } }); var updatesPerSecond = 100; setInterval(function() { if(orders.length > 500000) { return; } for(var i = 0; i < updatesPerSecond / 20; i++) { addOrder(); } }, 50); $("#frequency-slider").dxSlider({ min: 10, max: 5000, step: 10, value: updatesPerSecond, onValueChanged: function(e) { updatesPerSecond = e.value; }, tooltip: { enabled: true, showMode: "always", format: "#0 per second", position: "top" } }); });
<!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>DevExtreme Demo</title> <meta http-equiv="X-UA-Compatible" content="IE=edge" /> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0" /> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.0/jquery.min.js"></script> <script>window.jQuery || document.write(decodeURIComponent('%3Cscript src="js/jquery.min.js"%3E%3C/script%3E'))</script> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/18.2.3/css/dx.common.css" /> <link rel="dx-theme" data-theme="generic.light" href="https://cdn3.devexpress.com/jslib/18.2.3/css/dx.light.css" /> <script src="https://cdnjs.cloudflare.com/ajax/libs/jszip/3.1.2/jszip.min.js"></script> <script src="https://cdn3.devexpress.com/jslib/18.2.3/js/dx.all.js"></script> <script src="data.js"></script> <link rel="stylesheet" type ="text/css" href ="styles.css" /> <script src="index.js"></script> </head> <body class="dx-viewport"> <div class="demo-container"> <div id="grid-container"></div> <div class="options"> <div class="caption">Options</div> <div class="option"> <span>Update frequency:</span> <div id="frequency-slider"></div> </div> </div> </div> </body> </html>
.options { padding: 20px; margin-top: 20px; background-color: rgba(191, 191, 191, 0.15); } .caption { font-weight: 500; font-size: 18px; } .option { margin-top: 10px; } .option > span { position: relative; top: 2px; margin-right: 10px; } .option > .dx-widget { width: 500px; display: inline-block; vertical-align: middle; }
var cities = ["Los Angeles","Denver","Bentonville","Atlanta","Reno","Beaver","Malibu","Phoenix","San Diego","Little Rock","Pasadena","Boise","San Jose","Chatsworth","San Fernando","South Pasadena","San Fernando Valley","La Canada","St. Louis"]; var orders = []; var ordersStore = new DevExpress.data.ArrayStore({ key: "OrderID", data: orders }); var products = []; for(var i = 1; i <= 100; i++) { products.push({ ProductID: i, ProductName: "Product " + i, UnitPrice: Math.floor(Math.random() * 1000) + 1, Quantity: 0, Amount: 0, OrderCount: 0 }); } var productsStore = new DevExpress.data.ArrayStore({ key: "ProductID", data: products }); function addOrder() { var product = products[Math.round(Math.random() * 99)]; var order = { OrderID: orders.length ? orders[orders.length - 1].OrderID + 1 : 20001, ShipCity: cities[Math.round(Math.random() * (cities.length - 1))], ProductID: product.ProductID, UnitPrice: product.UnitPrice, OrderDate: new Date(), Quantity: Math.round(Math.random() * 20) + 1 }; ordersStore.push([{ type: "insert", data: order }]); productsStore.push([{ type: "update", key: order.ProductID, data: { OrderCount: product.OrderCount + 1, Quantity: product.Quantity + order.Quantity, Amount: product.Amount + order.UnitPrice * order.Quantity } }]); }