ion-range

shadow

The Range slider lets users select from a range of values by moving the slider knob. By default one knob controls the value of the range. This behavior can be customized using dual knobs.

By default the Range slider has a minimum value of 0 and a maximum value of 100. This can be configured with the min and max properties.

Labels

Labels should be used to describe the range. They can be used visually, and they will also be read out by screen readers when the user is focused on the range. This makes it easy for the user to understand the intent of the range. Range has several ways to assign a label:

• label property: used for plaintext labels
• label slot: used for custom HTML labels
• aria-label: used to provide a label for screen readers but adds no visible label

Label Placement

The below demo shows how to use the labelPlacement property to change the position of the label relative to the range. While the label property is used here, labelPlacement can also be used with the label slot.

Label Slot

While plaintext labels should be passed in via the label property, if custom HTML is needed, it can be passed through the label slot instead.

No Visible Label

If no visible label is needed, developers should still supply an aria-label so the range is accessible to screen readers.

Decorations

Decorative elements can be passed into the start or end slots of the range. This is useful for adding icons such as low volume or high volume icons. Since these elements are decorative, they should not be announced by assistive technology such as screen readers.

If the directionality of the document is set to left to right, the contents slotted to the start position will display to the left of the range, where as contents slotted to the end position will display to the right of the range. In right to left (rtl) directionality, the contents slotted to the start position will display to the right of the range, where as contents slotted to the end position will display to the left of the range.

Dual Knobs

Dual knobs introduce two knob controls that users can use to select a value at a lower and upper bounds. When selected, the Range will emit an ionChange event with a RangeValue, containing the upper and lower values selected.

Pins

The pin attribute will display the value of the Range above the knob when dragged. This allows users to select a specific value within the Range.

With the pinFormatter function, developers can customize the formatting of the range value to the user.

Snapping & Ticks

Ticks show indications for each available value on the Range. In order to use ticks, developers must set both snaps and the ticks property to true.

With snapping enabled, the Range knob will snap to the nearest available value as the knob is dragged and released.

Event Handling

Using ionChange

The ionChange event emits as the Range knob value changes.

Console

Console messages will appear here when logged from the example above.

Using ionKnobMoveStart and ionKnobMoveEnd

The ionKnobMoveStart event emits when the Range knob begins dragging, whether through mouse drag, touch gesture or keyboard interaction. Inversely, ionKnobMoveEnd emits when the Range knob is released. Both events emit with the RangeValue type and work in combination with the dualKnobs property.

Console

Console messages will appear here when logged from the example above.

Theming

CSS Custom Properties

Range includes CSS Variables to quickly theme and customize the appearance of the Range component to match your application's design.

CSS Shadow Parts

Range includes CSS Shadow Parts to allow complete customization of specific element nodes within the Range component. CSS Shadow Parts offer the most customization capabilities and are the recommended approach when requiring advance styling with the Range component.

Interfaces

RangeChangeEventDetail

interface RangeChangeEventDetail {
  value: RangeValue;
}

RangeKnobMoveStartEventDetail

interface RangeKnobMoveStartEventDetail {
  value: RangeValue;
}

RangeKnobMoveEndEventDetail

interface RangeKnobMoveEndEventDetail {
  value: RangeValue;
}

RangeCustomEvent

While not required, this interface can be used in place of the CustomEvent interface for stronger typing with Ionic events emitted from this component.

interface RangeCustomEvent extends CustomEvent {
  detail: RangeChangeEventDetail;
  target: HTMLIonRangeElement;
}

Types

RangeValue

type RangeValue = number | { lower: number, upper: number };

Properties

activeBarStart

Description	The start position of the range active bar. This feature is only available with a single knob (dualKnobs="false"). Valid values are greater than or equal to the min value and less than or equal to the max value.
Attribute	active-bar-start
Type	number ｜ undefined
Default	undefined

color

Description	The color to use from your application's color palette. Default options are: "primary", "secondary", "tertiary", "success", "warning", "danger", "light", "medium", and "dark". For more information on colors, see theming.
Attribute	color
Type	"danger" ｜ "dark" ｜ "light" ｜ "medium" ｜ "primary" ｜ "secondary" ｜ "success" ｜ "tertiary" ｜ "warning" ｜ string ｜ undefined
Default	undefined

debounce

Description	How long, in milliseconds, to wait to trigger the ionInput event after each change in the range value.
Attribute	debounce
Type	number ｜ undefined
Default	undefined

disabled

Description	If true, the user cannot interact with the range.
Attribute	disabled
Type	boolean
Default	false

dualKnobs

Description	Show two knobs.
Attribute	dual-knobs
Type	boolean
Default	false

label

Description	The text to display as the control's label. Use this over the label slot if you only need plain text. The label property will take priority over the label slot if both are used.
Attribute	label
Type	string ｜ undefined
Default	undefined

labelPlacement

Description	Where to place the label relative to the range. "start": The label will appear to the left of the range in LTR and to the right in RTL. "end": The label will appear to the right of the range in LTR and to the left in RTL. "fixed": The label has the same behavior as "start" except it also has a fixed width. Long text will be truncated with ellipses ("..."). "stacked": The label will appear above the range regardless of the direction.
Attribute	label-placement
Type	"end" ｜ "fixed" ｜ "stacked" ｜ "start"
Default	'start'

max

Description	Maximum integer value of the range.
Attribute	max
Type	number
Default	100

min

Description	Minimum integer value of the range.
Attribute	min
Type	number
Default	0

mode

Description	The mode determines which platform styles to use.
Attribute	mode
Type	"ios" ｜ "md"
Default	undefined

name

Description	The name of the control, which is submitted with the form data.
Attribute	name
Type	string
Default	this.rangeId

pin

Description	If true, a pin with integer value is shown when the knob is pressed.
Attribute	pin
Type	boolean
Default	false

pinFormatter

Description	A callback used to format the pin text. By default the pin text is set to Math.round(value). See https://ionicframework.com/docs/troubleshooting/runtime#accessing-this if you need to access this from within the callback.
Attribute	pin-formatter
Type	(value: number) => string ｜ number
Default	(value: number): number => Math.round(value)

snaps

Description	If true, the knob snaps to tick marks evenly spaced based on the step property value.
Attribute	snaps
Type	boolean
Default	false

step

Description	Specifies the value granularity.
Attribute	step
Type	number
Default	1

ticks

Description	If true, tick marks are displayed based on the step value. Only applies when snaps is true.
Attribute	ticks
Type	boolean
Default	true

value

Description	the value of the range.
Attribute	value
Type	number ｜ { lower: number; upper: number; }
Default	0

Events

Name	Description	Bubbles
ionBlur	Emitted when the range loses focus.	true
ionChange	The ionChange event is fired for <ion-range> elements when the user modifies the element's value: - When the user releases the knob after dragging; - When the user moves the knob with keyboard arrows This event will not emit when programmatically setting the value property.	true
ionFocus	Emitted when the range has focus.	true
ionInput	The ionInput event is fired for <ion-range> elements when the value is modified. Unlike ionChange, ionInput is fired continuously while the user is dragging the knob.	true
ionKnobMoveEnd	Emitted when the user finishes moving the range knob, whether through mouse drag, touch gesture, or keyboard interaction.	true
ionKnobMoveStart	Emitted when the user starts moving the range knob, whether through mouse drag, touch gesture, or keyboard interaction.	true

Methods

No public methods available for this component.

CSS Shadow Parts

Name	Description
bar	The inactive part of the bar.
bar-active	The active part of the bar.
knob	The handle that is used to drag the range.
label	The label text describing the range.
pin	The counter that appears above a knob.
tick	An inactive tick mark.
tick-active	An active tick mark.

CSS Custom Properties

iOS

Name	Description
--bar-background	Background of the range bar
--bar-background-active	Background of the active range bar
--bar-border-radius	Border radius of the range bar
--bar-height	Height of the range bar
--height	Height of the range
--knob-background	Background of the range knob
--knob-border-radius	Border radius of the range knob
--knob-box-shadow	Box shadow of the range knob
--knob-size	Size of the range knob
--pin-background	Background of the range pin (only available in MD mode)
--pin-color	Color of the range pin (only available in MD mode)

MD

Name	Description
--bar-background	Background of the range bar
--bar-background-active	Background of the active range bar
--bar-border-radius	Border radius of the range bar
--bar-height	Height of the range bar
--height	Height of the range
--knob-background	Background of the range knob
--knob-border-radius	Border radius of the range knob
--knob-box-shadow	Box shadow of the range knob
--knob-size	Size of the range knob
--pin-background	Background of the range pin (only available in MD mode)
--pin-color	Color of the range pin (only available in MD mode)

Slots

Name	Description
end	Content is placed to the right of the range slider in LTR, and to the left in RTL.
label	The label text to associate with the range. Use the "labelPlacement" property to control where the label is placed relative to the range.
start	Content is placed to the left of the range slider in LTR, and to the right in RTL.