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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.
www.geohive.com
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If you have technical questions, please create a support ticket in the DevExpress Support Center.
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<template>
<div>
<DxPieChart
ref="pieChart"
:data-source="populationData"
type="doughnut"
palette="Soft Pastel"
title="The Population of Continents and Regions"
@point-click="onPointClick"
>
<DxSeries argument-field="region"/>
<DxSize :height="350"/>
<DxTooltip
:enabled="false"
:customize-tooltip="customizeTooltip"
format="millions"
/>
<DxLegend :visible="false"/>
</DxPieChart>
<div class="controls-pane">
<DxSelectBox
: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 { createApp } from 'vue';
import App from './App.vue';
createApp(App).mount('#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/20.2.5/css/dx.common.css" />
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/20.2.5/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',
meta: {
'*.vue': {
loader: 'vue-loader'
},
'devextreme/localization.js': {
"esModule": true
},
},
paths: {
'npm:': 'https://unpkg.com/'
},
map: {
'vue': 'npm:vue@3.0.0/dist/vue.esm-browser.js',
'vue-loader': 'npm:dx-systemjs-vue-browser@1.0.15/index.js',
'mitt': 'npm:mitt/dist/mitt.umd.js',
'rrule': 'npm:rrule@2.6.6/dist/es5/rrule.js',
'luxon': 'npm:luxon@1.25.0/build/global/luxon.min.js',
'es6-object-assign': 'npm:es6-object-assign@1.1.0',
'devextreme': 'npm:devextreme@20.2.5',
'devextreme-vue': 'npm:devextreme-vue@20.2.5',
'jszip': 'npm:jszip@3.5.0/dist/jszip.min.js',
'devextreme-quill': 'npm:devextreme-quill@0.9.8/dist/dx-quill.min.js',
'devexpress-diagram': 'npm:devexpress-diagram@2.0.11/dist/dx-diagram.js',
'devexpress-gantt': 'npm:devexpress-gantt@2.0.18/dist/dx-gantt.js',
'preact': 'npm:preact@10.5.11/dist/preact.js',
'preact/hooks': 'npm:preact@10.5.11/hooks/dist/hooks.js',
'plugin-babel': 'npm:systemjs-plugin-babel@0.0.25/plugin-babel.js',
'systemjs-babel-build': 'npm:systemjs-plugin-babel@0.0.25/systemjs-babel-browser.js'
},
packages: {
'devextreme-vue': {
main: 'index.js'
},
'devextreme': {
defaultExtension: 'js'
},
'devextreme/events/utils': {
main: 'index'
},
'devextreme/events': {
main: 'index'
},
'es6-object-assign': {
main: './index.js',
defaultExtension: 'js'
}
},
babelOptions: {
sourceMaps: false,
stage0: true
}
});