React PolarChart - tooltip

Configures tooltips.

Type:

Object

A tooltip is a miniature rectangle displaying values of a series point. A tooltip appears when the end-user hovers the cursor over a series point. You can enable/disable tooltips, change their appearance and format their text using fields of the tooltip configuration object.

argumentFormat

Formats the point argument before it is displayed in the tooltip. To format the point value, use the format option.

Type:

Format

Default Value: undefined

NOTE
DevExtreme widgets provide a wide choice of predefined formats. If you are, however, going to use custom formats, link the Globalize library to your project. Learn how to do this from topics in the Installation section.
See Also
  • format - provides a comprehensive overview of formatting capabilities.
  • Data Formatting - shows how to apply formatting to various widget elements.

arrowLength

Specifies the length of a tooltip's arrow in pixels.

Type:

Number

Default Value: 10

border

Configures a tooltip's border.

Type:

Object

color

Colors all tooltips.

Type:

String

Default Value: '#ffffff'

This option supports the following colors:

This option sets one color for all tooltips. You can specify a particular tooltip's color in the tooltip.customizeTooltip function.

container

Specifies the container in which to draw tooltips. The default container is the HTML DOM <body> element.

Type:

String

|

DOM Node

|

jQuery

Default Value: undefined

cornerRadius

Makes all the tooltip's corners rounded.

Type:

Number

Default Value: 0, 4 (Material)

The following table demonstrates how the corner's curvature depends on the cornerRadius value:

cornerRadius Result
cornerRadius: 0 DevExtreme Chart: tooltip with cornerRadius set to 0
cornerRadius: 15 DevExtreme Chart: tooltip with cornerRadius set to 15
cornerRadius: 35 DevExtreme Chart: tooltip with cornerRadius set to 35

customizeTooltip

Allows you to change tooltip appearance.

Type:

Function

Function parameters:
pointInfo:

Object

Information on the series point being pressed or hovered over with the mouse pointer.

Return Value:

Object

The tooltip's text or markup and appearance settings.

Default Value: undefined
Cannot be used in themes.

This option should be assigned a function returning a specific object. The following fields can be specified in this object.

  • color
    Specifies the color of a tooltip.

  • text
    Specifies the text displayed by a tooltip.

  • html
    Specifies the HTML markup displayed by a tooltip.

    NOTE
    If you are going to use external resources (for example, images) in the markup, specify the size of the area they will occupy beforehand.
  • fontColor
    Specifies the color of the text displayed by a tooltip.

  • borderColor
    Specifies the color of the tooltip border.

This function's parameter has the following fields:

  • originalValue
    Specifies the value of the currently represented point as it is set in the data source.
  • value
    Specifies the value of the currently represented point. Differs from the originalValue when the axis value type is specified explicitly. In this instance, the value field contains a value in the specified type.
  • valueText
    Specifies the value of the currently hovered point with applied formatting if the format property is specified.
  • originalArgument
    Specifies the argument value of the currently represented point as it is set in the data source.
  • argument
    Specifies the argument value of the currently represented point. Differs from the originalArgument when the axis' argument type differs from the argument type in the data source. In this instance, argument has the type of the argument axis.
  • argumentText
    Specifies the argument value of the currently hovered point with applied formatting if the argumentFormat option is specified.
  • seriesName
    Specifies the series of the currently hovered point.
  • point
    Provides access to the hovered point. To learn more about the field and methods of the point object, refer to the Point topic in the "Chart Elements" reference section.
  • points (for shared tooltip only)
    Provides access to the array of points with the same argument as the currently hovered point. This field is accessible when the shared option of the tooltip object is set to true. To learn more about the fields and methods of the point object, refer to the Point topic in the "Chart Elements" reference section. The function's parameter represents the same object as the this object. If appropriate, you can use the function's parameter to obtain the value that is currently represented by a tooltip.
NOTE
As an alternative to the function’s parameter you can use the this keyword.
See Also

enabled

Enables tooltips.

Type:

Boolean

Default Value: false

font

Specifies tooltips' font options.

Type:

Object

format

Formats a value before it is displayed it in a tooltip.

Type:

Format

Default Value: undefined

See the format section for details on accepted values.

See Also

opacity

Specifies tooltips' transparency.

Type:

Number

Default Value: undefined

This option accepts a value from 0 to 1, where 0 makes tooltips completely transparent, and 1 makes them opaque.

paddingLeftRight

Generates an empty space, measured in pixels, between a tooltip's left/right border and its text.

Type:

Number

Default Value: 18

DevExtreme HTML5 JavaScript Funnel Tooltips Left-Right Padding

paddingTopBottom

Generates an empty space, measured in pixels, between a tooltip's top/bottom border and its text.

Type:

Number

Default Value: 15

DevExtreme HTML5 JavaScript Funnel Tooltips Top-Bottom Padding

shadow

Configures a tooltip's shadow.

Type:

Object

shared

Specifies the kind of information to display in a tooltip.

Type:

Boolean

Default Value: false

By default, a tooltip displays information about the currently hovered series point. If you set the shared option to true, the tooltip will display information about all the points that have the same argument as the hovered point at once.

If the text displayed in the tooltip by default doesn't suit your needs, you can customize it using the customizeTooltip option.

zIndex

Specifies a tooltip's z-index.

Type:

Number

Default Value: undefined

If the widget's container has the CSS z-index property specified, and tooltips are displayed incorrectly, configure their z-index using this option.