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React Charts - API - Display a Tooltip
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.wikipedia.org
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Backend API
x
import React, { useCallback, useRef, useState } from 'react';
import PieChart, {
Series, Tooltip, Size, Legend, PieChartTypes, PieChartRef
} from 'devextreme-react/pie-chart';
import { SelectBox } from 'devextreme-react/select-box';
import { populationData, regionLabel } from './data.ts';
const customizeTooltip = (pointInfo) => ({
text: `${pointInfo.argumentText}<br/>${pointInfo.valueText}`,
});
function App() {
const [selectedRegion, setSelectedRegion] = useState(null);
const pieChartRef = useRef<PieChartRef>(null);
const showTooltip = useCallback((point) => {
point.showTooltip();
setSelectedRegion(point.argument);
}, [setSelectedRegion]);
const onPointClick = useCallback(({ target: point }: PieChartTypes.PointClickEvent) => {
showTooltip(point);
}, [showTooltip]);
const onRegionChanged = useCallback(({ value }) => {
const point = pieChartRef.current.instance().getAllSeries()[0].getPointsByArg(value)[0];
showTooltip(point);
}, [showTooltip]);
return (
<React.Fragment>
<PieChart
ref={pieChartRef}
dataSource={populationData}
onPointClick={onPointClick}
type="doughnut"
palette="Soft Pastel"
title="The Population of Continents and Regions"
>
<Series argumentField="region" />
<Size height={350} />
<Tooltip
enabled={false}
format="millions"
customizeTooltip={customizeTooltip}
/>
<Legend visible={false} />
</PieChart>
<div className="controls-pane">
<SelectBox
width={250}
dataSource={populationData}
inputAttr={regionLabel}
displayExpr="region"
valueExpr="region"
placeholder="Choose region"
value={selectedRegion}
onValueChanged={onRegionChanged}
/>
</div>
</React.Fragment>
);
}
export default App;
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