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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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    <template> <div> <dx-pie-chart ref="pieChart" :data-source="populationData" type="doughnut" palette="Soft Pastel" title="The Population of Continents and Regions" @point-click="onPointClick" > <dx-series argument-field="region"/> <dx-size :height="350"/> <dx-tooltip :enabled="false" :customize-tooltip="customizeTooltip" format="millions" /> <dx-legend :visible="false"/> </dx-pie-chart> <div class="controls-pane"> <dx-select-box :width="250" :data-source="populationData" :value="selectedRegion" display-expr="region" value-expr="region" placeholder="Choose region" @value-changed="onRegionChanged" /> </div> </div> </template> <script> import DxPieChart, { DxSeries, DxTooltip, DxSize, DxLegend } from 'devextreme-vue/pie-chart'; import DxSelectBox from 'devextreme-vue/select-box'; import { populationData } from './data.js'; export default { components: { DxSelectBox, DxPieChart, DxSeries, DxTooltip, DxSize, DxLegend }, data() { return { selectedRegion: null, populationData }; }, methods: { onPointClick({ target: point }) { point.showTooltip(); this.selectedRegion = point.argument; }, onRegionChanged({ value }) { const pieChartInstance = this.$refs.pieChart.instance; const point = pieChartInstance.getAllSeries()[0].getPointsByArg(value)[0]; point.showTooltip(); }, customizeTooltip(pointInfo) { return { text: `${pointInfo.argumentText}<br/>${pointInfo.valueText}` }; } } }; </script> <style> .controls-pane { margin-top: 20px; text-align: center; } .dx-selectbox { display: inline-block; } </style>
    import Vue from 'vue'; import App from './App.vue'; new Vue({ el: '#app', components: { App }, template: '<App/>' });
    <!DOCTYPE html> <html> <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" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/19.2.4/css/dx.common.css" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/19.2.4/css/dx.light.css" /> <script src="https://unpkg.com/core-js@2.4.1/client/shim.min.js"></script> <script src="https://unpkg.com/systemjs@0.21.3/dist/system.js"></script> <script type="text/javascript" src="config.js"></script> <script type="text/javascript"> System.import('./index.js'); </script> </head> <body class="dx-viewport"> <div class="demo-container"> <div id="app"> </div> </div> </body> </html>
    export const populationData = [{ 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 }];
    System.config({ transpiler: 'plugin-babel', paths: { 'npm:': 'https://unpkg.com/' }, map: { vue: 'npm:vue@2.6.3/dist/vue.esm.browser.js', 'vue-loader': 'npm:dx-systemjs-vue-browser@latest/index.js', 'devextreme': 'npm:devextreme@19.2', 'devextreme-vue': 'npm:devextreme-vue@19.2', jszip: 'npm:jszip@3.1.3/dist/jszip.min.js', 'quill': 'npm:quill@1.3.7/dist/quill.js', 'devexpress-diagram': 'npm:devexpress-diagram', 'stackblur-canvas': 'npm:stackblur-canvas', 'rgbcolor': 'npm:rgbcolor', 'canvg': 'npm:canvg', 'plugin-babel': 'npm:systemjs-plugin-babel@0/plugin-babel.js', 'systemjs-babel-build': 'npm:systemjs-plugin-babel@0/systemjs-babel-browser.js' }, meta: { '*.vue': { loader: 'vue-loader' } }, packages: { 'devextreme-vue': { main: 'index.js' }, 'devextreme': { defaultExtension: 'js' } }, babelOptions: { sourceMaps: false, stage0: true } });