DevExtreme React - Hover

When a user pauses on a series, the series changes its style to the one specified by the following objects.

• series.hoverStyle
  The hover style for an individual series.

• commonSeriesSettings.%seriesType%.hoverStyle
  The hover style for all series of a specific type (line, bar, etc.).

• commonSeriesSettings.hoverStyle
  The hover style for all series in the Chart.

Note that individual settings override type-specific settings which, in turn, override common settings.

$(function() {
    $("#chartContainer").dxChart({
        // ...
        series: {
            hoverStyle: {
                // high priority
            }
        },
        commonSeriesSettings: {
            bar: {
                hoverStyle: {
                    // middle priority
                }
            },
            hoverStyle: {
                // low priority
            }
        }
    });
});

<dx-chart ... >
    <dxi-series ... >
        <dxo-hover-style>
            <!-- high priority -->
        </dxo-hover-style>
    </dxi-series>
    <dxo-common-series-settings ... >
        <dxo-hover-style>
            <!-- low priority -->
        </dxo-hover-style>
        <dxo-bar>
            <dxo-hover-style>
                <!-- middle priority -->
            </dxo-hover-style>
        </dxo-bar>
    </dxo-common-series-settings>
</dx-chart>

import { DxChartModule } from 'devextreme-angular';
// ...
export class AppComponent {
    // ...
}
@NgModule({
    imports: [
        // ...
        DxChartModule
    ],
    // ...
})

To choose which series elements should be highlighted when a user pauses on a series, specify the hoverMode option. Just like hoverStyle, this option can be specified for all series in the Chart, for all series of a specific type, or for an individual series. Note also that depending on the series type, the hoverMode option accepts different values. For information about them, visit the Series Types section of the API reference, choose the employed series type, and refer to its hoverMode option description.

$(function() {
    $("#chartContainer").dxChart({
        // ...
        commonSeriesSettings: {
            bar: {
                hoverMode: 'allSeriesPoints' // or 'onlyPoint' | 'allArgumentPoints' | 'none'
            },
            line: {
                hoverMode: 'includePoints' // or 'nearestPoint' | 'excludePoints' | 'none'
            }
        }
    });
});

<dx-chart ... >
    <dxo-common-series-settings ... >
        <dxo-bar
            hoverMode="allSeriesPoints"> <!-- or 'onlyPoint' | 'allArgumentPoints' | 'none' -->
        </dxo-bar>
        <dxo-line
            hoverMode="includePoints"> <!-- or 'nearestPoint' | 'excludePoints' | 'none' -->
        </dxo-line>
    </dxo-common-series-settings>
</dx-chart>

import { DxChartModule } from 'devextreme-angular';
// ...
export class AppComponent {
    // ...
}
@NgModule({
    imports: [
        // ...
        DxChartModule
    ],
    // ...
})

View Demo

See Also

• Point Hover
• Chart API Reference

You can switch a series into the hover state by calling its hover() method, and its clearHover() method to switch it back to the normal state. The same API is available for series points.

var toggleSeriesHoverState = function (series) {
    !series.isHovered() ? series.hover() : series.clearHover();        
}

import { DxChartModule } from 'devextreme-angular';
// ...
export class AppComponent {
    toggleSeriesHoverState (series) {
        !series.isHovered() ? series.hover() : series.clearHover();
    }
}
@NgModule({
    imports: [
        // ...
        DxChartModule
    ],
    // ...
})

See Also

• Access a Series Using the API
• Call Methods: jQuery | Angular | AngularJS | Knockout | ASP.NET MVC

When a user pauses on a series, the Chart fires the seriesHoverChanged 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 onSeriesHoverChanged option when you configure the widget. To check whether the pointer entered or left a series, call the isHovered() method in the series.

$(function() {
    $("#chartContainer").dxChart({
        // ...
        onSeriesHoverChanged: function (e) {
            var series = e.target;
            if (series.isHovered()) {
                // Commands to execute when the series is hovered over
            } else {
                // Commands to execute when the series is hovered out
            }
        }
    });
});

<dx-chart
    (onSeriesHoverChanged)="onSeriesHoverChanged($event)">
</dx-chart>

import { DxChartModule } from 'devextreme-angular';
// ...
export class AppComponent {
    onSeriesHoverChanged (e) {
        let series = e.target;
        if (series.isHovered()) {
            // Commands to execute when the series is hovered over
        } else {
            // Commands to execute when the series is hovered out
        }
    };
}
@NgModule({
    imports: [
        // ...
        DxChartModule
    ],
    // ...
})

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

var seriesHoverChangedHandler1 = function (e) {
    var series = e.target;
    // First handler of the "seriesHoverChanged" event
};

var seriesHoverChangedHandler2 = function (e) {
    var series = e.target;
    // Second handler of the "seriesHoverChanged" event
};

$("#chartContainer").dxChart("instance")
    .on("seriesHoverChanged", seriesHoverChangedHandler1)
    .on("seriesHoverChanged", seriesHoverChangedHandler2);

See Also

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