API - Display a Tooltip

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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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www.wikipedia.org

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$(() => { const chart = $('#chart').dxPieChart({ type: 'doughnut', palette: 'Soft Pastel', dataSource, title: 'The Population of Continents and Regions', tooltip: { enabled: false, format: 'millions', customizeTooltip(arg) { return { text: `${arg.argumentText}<br/>${arg.valueText}`, }; }, }, size: { height: 350, }, onPointClick(e) { const point = e.target; point.showTooltip(); region.option('value', point.argument); }, legend: { visible: false, }, series: [{ argumentField: 'region', }], }).dxPieChart('instance'); const region = $('#selectbox').dxSelectBox({ width: 250, dataSource, displayExpr: 'region', inputAttr: { 'aria-label': 'Region' }, valueExpr: 'region', placeholder: 'Choose region', onValueChanged(data) { chart.getAllSeries()[0].getPointsByArg(data.value)[0].showTooltip(); }, }).dxSelectBox('instance'); });

<!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/23.1.5/css/dx.light.css" /> <script src="https://cdn3.devexpress.com/jslib/23.1.5/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="chart"></div> <div class="controls-pane"> <div id="selectbox"></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, }];