tooltip

Configures tooltips.

Type:

Object

A tooltip is a miniature rectangle displaying the value of a gauge's indicator. A tooltip appears when the end-user hovers the cursor over an indicator. You can enable/disable tooltips, change their appearance and format their text using fields of the tooltip configuration object.

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

contentTemplate

Specifies a custom template for a tooltip.

Type:

template

Function parameters:
scaleValue:

Object

Information on the scale value.

Object structure:
Name Type Description
value

Number

The raw value.

valueText

String

The formatted value converted to a string.

element:

Element (jQuery or HTML)

The tooltip's container. It is an HTML Element or a jQuery Element when you use jQuery.

Return Value:

String

|

DOM Node

|

jQuery

One of the following:

  • HTML markup as a string
  • A DOM node
  • A DOM node wrapped in a jQuery element
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 the appearance of specified tooltips.

Type:

Function

Function parameters:
scaleValue:

Object

Information on the scale value.

Object structure:
Name Type Description
value

Number

The raw value.

valueText

String

The formatted value converted to a string.

Return Value:

Object

The tooltip's configuration.

Default Value: undefined

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.

  • borderColor
    Specifies the color of the tooltip's border.

  • fontColor
    Specifies the color of the tooltip's text.

  • 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.
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

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.