DevExtreme React - Handle Tooltip Events

When a tooltip becomes shown or hidden, the Chart fires the tooltipShown or tooltipHidden event that you can handle with a function. If the handling function is not going to be changed during the lifetime of the widget, assign it to the onTooltipShown or onTooltipHidden option respectively, when you configure the widget.

import React from 'react';
import Chart from 'devextreme-react/chart';
 
class App extends React.Component {
    render() {
        return (
            <Chart ... 
                onTooltipShown={onTooltipShown} 
                onTooltipHidden={onTooltipHidden}>
            </Chart>
        );
    }
}
 
function onTooltipShown (e) {
    const point = e.target;
    // Handler of the "tooltipShown" event
}
function onTooltipHidden (e) {
    const point = e.target;
    // Handler of the "tooltipHidden" event
}
 
export default App;

If you are going to change the event handlers at runtime or if you need to attach several handlers to a single event, subscribe to this event using the on(eventName, eventHandler) method. This approach is more typical of jQuery.

var tooltipShownHandler1 = function (e) {
    var point = e.target;
    // First handler of the "tooltipShown" event
};
 
var tooltipShownHandler2 = function (e) {
    var point = e.target;
    // Second handler of the "tooltipShown" event
};
 
$("#chartContainer").dxChart("instance")
    .on("tooltipShown", tooltipShownHandler1)
    .on("tooltipShown", tooltipShownHandler2);

See Also

• Handle Events: Angular | Vue | React | jQuery | AngularJS | Knockout | ASP.NET MVC 5 | ASP.NET Core
• Chart API Reference