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    Charts

    Server-Side Data Processing

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    In many cases, before being handed out to the client, data is processed on the server. The DevExtreme JavaScript UI components support this scenario. In this demo, the data source of the Chart component loads weather data for a selected month from an OData service. Each time the month is changed, the data source sends a new query to the service.

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    const DemoApp = angular.module('DemoApp', ['dx']); DemoApp.controller('DemoController', ($scope) => { const chartDataSource = new DevExpress.data.DataSource({ store: { type: 'odata', url: 'https://js.devexpress.com/Demos/WidgetsGallery/odata/WeatherItems', }, postProcess(results) { return results[0].DayItems; }, expand: 'DayItems', filter: ['Id', '=', 1], paginate: false, }); $scope.chartOptions = { dataSource: chartDataSource, title: 'Temperature in Seattle , 2017', size: { height: 420, }, series: { argumentField: 'Number', valueField: 'Temperature', type: 'spline', }, legend: { visible: false, }, commonPaneSettings: { border: { visible: true, width: 2, top: false, right: false, }, }, export: { enabled: true, }, tooltip: { enabled: true, customizeTooltip(arg) { return { text: `${arg.valueText}&#176C`, }; }, }, valueAxis: { valueType: 'numeric', grid: { opacity: 0.2, }, label: { customizeText() { return `${this.valueText}&#176C`; }, }, }, argumentAxis: { type: 'discrete', grid: { visible: true, opacity: 0.5, }, }, loadingIndicator: { enabled: true, }, }; $scope.selectBoxOptions = { width: 150, value: 1, items: months, valueExpr: 'id', displayExpr: 'name', onValueChanged(e) { chartDataSource.filter(['Id', '=', e.value]); chartDataSource.load(); }, }; });
    <!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/3.5.1/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/21.2.4/css/dx.common.css" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/21.2.4/css/dx.light.css" /> <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.8.2/angular.min.js"></script> <script>window.angular || document.write(decodeURIComponent('%3Cscript src="js/angular.min.js"%3E%3C/script%3E'))</script> <script src="https://cdn3.devexpress.com/jslib/21.2.4/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" ng-app="DemoApp" ng-controller="DemoController"> <div id="chart-demo"> <div id="chart" dx-chart="chartOptions"></div> <div class="action"> <div class="label">Choose a month:</div> <div id="selectbox" dx-select-box="selectBoxOptions"></div> </div> </div> </div> </body> </html>
    .action { width: 270px; margin-top: 20px; display: flex; justify-content: space-between; align-items: center; }
    const months = [{ id: 1, name: 'January', }, { id: 2, name: 'February', }, { id: 3, name: 'March', }, { id: 4, name: 'April', }, { id: 5, name: 'May', }, { id: 6, name: 'June', }, { id: 7, name: 'July', }, { id: 8, name: 'August', }, { id: 9, name: 'September', }, { id: 10, name: 'October', }, { id: 11, name: 'November', }, { id: 12, name: 'December', }];