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    Charts

    API - Display a Tooltip

    Documentation

    This demo illustrates how to show and hide the point’s tooltip with the API. To test this feature, select a continent from the drop-down menu under the PieChart or click a point directly in the PieChart.

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    ASP.NET MVC

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    const DemoApp = angular.module('DemoApp', ['dx']); DemoApp.controller('DemoController', ($scope) => { $scope.selectedRegion = ''; $scope.pieChartOptions = { type: 'doughnut', palette: 'Soft Pastel', dataSource, title: 'The Population of Continents and Regions', tooltip: { enabled: false, format: 'millions', customizeTooltip(arg) { return { text: `${arg.argumentText}<br/>${arg.valueText}`, }; }, }, size: { height: 350, }, onPointClick(e) { const point = e.target; point.showTooltip(); $scope.selectedRegion = point.argument; }, legend: { visible: false, }, series: [{ argumentField: 'region', }], }; $scope.selectBoxOptions = { width: 250, dataSource, displayExpr: 'region', valueExpr: 'region', placeholder: 'Choose region', onValueChanged(data) { $('#chart').dxPieChart('instance').getAllSeries()[0].getPointsByArg(data.value)[0].showTooltip(); }, bindingOptions: { value: 'selectedRegion', }, }; });
    <!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/22.1.4/css/dx.common.css" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/22.1.4/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/22.1.4/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" dx-pie-chart="pieChartOptions"></div> <div class="controls-pane"> <div dx-select-box="selectBoxOptions"></div> </div> </div> </body> </html>
    .controls-pane { margin-top: 20px; text-align: center; } .dx-selectbox { display: inline-block; }
    const dataSource = [{ region: 'Asia', val: 4119626293, }, { region: 'Africa', val: 1012956064, }, { region: 'Northern America', val: 344124520, }, { region: 'Latin America and the Caribbean', val: 590946440, }, { region: 'Europe', val: 727082222, }, { region: 'Oceania', val: 35104756, }];