Element: <oj-status-meter-gauge>

Oracle® JavaScript Extension Toolkit (JET)
7.1.0

F18183-01

Signature:

class ojStatusMeterGauge

QuickNav

Attributes

JET Custom Elements

JET components are implemented as custom HTML elements. In addition to the component attributes documented in this page, JET components also support standard HTML global attributes like id and aria-label.

The JET data binding syntax can be used to define both component and global attributes through the use of dynamically evaluated expressions. All attributes (component and global) support attribute-level binding by prefixing the attribute name with ":" (e.g. :id="[...]"). When using attribute-level binding, all expression values are treated as strings. Additionally, component attributes support property-level binding by using the attribute name directly with no ":" prefix. When using property-level binding, the expressions should evaluate to the types documented by the corresponding attributes. Property-level binding is strongly recommended over attribute-level binding for component attributes.

A detailed description of working with custom HTML elements can be found in: JET Custom Element Usage.



PREVIEW: This is a preview API. Preview APIs are production quality, but can be changed on a major version without a deprecation path.

Version:
  • 7.1.0
Since:
  • 0.7.0
Module:
  • ojgauge

Module usage

See JET Module Loading for an overview of module usage within JET.

Typescript Import Format
//To typecheck the element APIs, import as below.
import {ojStatusMeterGauge} from "ojs/ojgauge";

//For the transpiled javascript to load the element's module, import as below
import "ojs/ojgauge";

JET In Typescript

A detailed description of working with JET elements and classes in your typescript project can be found at: JET Typescript Usage.


JET Status Meter Gauge

Status meter gauges support horizontal and circular status meters.


<oj-status-meter-gauge
  value='63'
  min='0'
  max='100'
  thresholds='[{"max": 33}, {"max": 67}, {}]'>
</oj-status-meter-gauge>

Accessibility

The application is responsible for populating the shortDesc value in the component properties object with meaningful descriptors when the component does not provide a default descriptor. Since component terminology for keyboard and touch shortcuts can conflict with those of the application, it is the application's responsibility to provide these shortcuts, possibly via a help popup.

Touch End User Information

Gesture Action
Press & Hold Display tooltip.
Drag Value change when readonly is false.

Keyboard End User Information

Key Action
Enter Submit the current value of the gauge.
Tab Move focus to next element and submit the current value of the gauge.
Shift + Tab Move focus to previous element.
UpArrow Increase the gauge's transient value. Value is set after using Enter or Tab to submit.
DownArrow Decrease the gauge's transient value. Value is set after using Enter or Tab to submit.
LeftArrow Decrease the gauge's transient value in left-to-right locales. Increase the gauge's transient value in right-to-left locales. Value is set after using Enter or Tab to submit.
RightArrow Increase the gauge's transient value in left-to-right locales. Decrease the gauge's transient value in right-to-left locales. Value is set after using Enter or Tab to submit.

Performance

Tracking Resize

By default, the element will track resizes and render at the new size. This functionality adds a small overhead to the initial render for simple elements like gauges or spark charts, which become noticable when using large numbers of these simple elements. To disable resize tracking, set trackResize to off. The application can manually request a re-render at any time by calling the refresh function.

Reading direction

As with any JET component, in the unusual case that the directionality (LTR or RTL) changes post-init, the component must be refresh()ed.

Note: Application logic should not interact with the component's properties or invoke its methods until the BusyContext indicates that the component is ready for interaction.

Slots

JET components that allow child content support slots. Please see the slots section of the JET component overview doc for more information on allowed slot content and slot types.

centerTemplate

PREVIEW: This is a preview API. Preview APIs are production quality, but can be changed on a major version without a deprecation path.

The centerTemplate slot is used to specify custom center content for a circular status meter gauge. This slot takes precedence over the center.renderer property if specified.

When the template is executed, the component's binding context is extended with the following properties:

contextMenu

The contextMenu slot is set on the oj-menu within this element. This is used to designate the JET Menu that this component should launch as a context menu on right-click, Shift-F10, Press & Hold, or component-specific gesture. If specified, the browser's native context menu will be replaced by the JET Menu specified in this slot.

The application can register a listener for the Menu's ojBeforeOpen event. The listener can cancel the launch via event.preventDefault(), or it can customize the menu contents by editing the menu DOM directly, and then calling refresh() on the Menu.

To help determine whether it's appropriate to cancel the launch or customize the menu, the ojBeforeOpen listener can use component API's to determine which table cell, chart item, etc., is the target of the context menu. See the JSDoc of the individual components for details.

Keep in mind that any such logic must work whether the context menu was launched via right-click, Shift-F10, Press & Hold, or component-specific touch gesture.

tooltipTemplate

PREVIEW: This is a preview API. Preview APIs are production quality, but can be changed on a major version without a deprecation path.

The tooltipTemplate slot is used to specify custom tooltip content. This slot takes precedence over the tooltip.renderer property if specified.

When the template is executed, the component's binding context is extended with the following properties:

Attributes

angle-extent :number

Specifies the angle extent of a gauge with circular orientation. Value should be provided in degrees.
Default Value:
  • 360
Names
Item Name
Property angleExtent
Property change event angleExtentChanged
Property change listener attribute (must be of type function) on-angle-extent-changed

(nullable) animation-duration :number

The duration of the animations in milliseconds. The default value comes from the CSS and varies based on theme.
Names
Item Name
Property animationDuration
Property change event animationDurationChanged
Property change listener attribute (must be of type function) on-animation-duration-changed

animation-on-data-change :"auto"|"none"

Defines the animation that is applied on data changes.
Supported Values:
Value
"auto"
"none"
Default Value:
  • "none"
Names
Item Name
Property animationOnDataChange
Property change event animationOnDataChangeChanged
Property change listener attribute (must be of type function) on-animation-on-data-change-changed

animation-on-display :"auto"|"none"

Defines the animation that is shown on initial display.
Supported Values:
Value
"auto"
"none"
Default Value:
  • "none"
Names
Item Name
Property animationOnDisplay
Property change event animationOnDisplayChanged
Property change listener attribute (must be of type function) on-animation-on-display-changed

border-color :string

The border color of the gauge. Only applies when thresholds are not defined. The default value varies based on theme.
Names
Item Name
Property borderColor
Property change event borderColorChanged
Property change listener attribute (must be of type function) on-border-color-changed

border-radius :string

Defines the border radius of the indicator and plot area. When set to "auto", the border radius is set to a built-in default. Acceptable input follows CSS border-radius attribute specifications. The plot area border radius can be overwritten with the plotArea borderRadius atribute.
Default Value:
  • "auto"
Names
Item Name
Property borderRadius
Property change event borderRadiusChanged
Property change listener attribute (must be of type function) on-border-radius-changed

center :Object

An object defining the center content of a status meter with circular orientation.
Names
Item Name
Property center
Property change event centerChanged
Property change listener attribute (must be of type function) on-center-changed

center.renderer :((context: ojStatusMeterGauge.CenterContext) => ({insert: Element|string}|{preventDefault: boolean}))

A function that returns custom center content. The function takes a center context argument, provided by the gauge, and should return an object with the following property:
  • insert: HTMLElement - HTML element, which will be overlaid on top of the gauge. This HTML element will block interactivity of the gauge by default, but the CSS pointer-events property can be set to 'none' on this element if the gauge's interactivity is desired.
Default Value:
  • null
Names
Item Name
Property center.renderer

color :string

The color of the gauge. Only applies when thresholds are not defined. The default value varies based on theme.
Names
Item Name
Property color
Property change event colorChanged
Property change listener attribute (must be of type function) on-color-changed

indicator-size :number

Defines the ratio of relative thickness of the indicator to the plot area.
Default Value:
  • 1
Names
Item Name
Property indicatorSize
Property change event indicatorSizeChanged
Property change listener attribute (must be of type function) on-indicator-size-changed

inner-radius :number

Specifies the inner radius of a gauge with circular orientation, defined by the distance from the center of the gauge to the innermost edge of the indicator and plot area. Valid values are a percent or ratio from 0 to 1.
Default Value:
  • .7
Names
Item Name
Property innerRadius
Property change event innerRadiusChanged
Property change listener attribute (must be of type function) on-inner-radius-changed

label :Object

An object defining the label.
Names
Item Name
Property label
Property change event labelChanged
Property change listener attribute (must be of type function) on-label-changed

(nullable) label.position :string

Defines the position of the label for horizontal and vertical gauges. The default position for horizontal gauges is 'start' and for vertical gauges is 'center'.
Supported Values:
Value
"auto"
"center"
"start"
Default Value:
  • "auto"
Names
Item Name
Property label.position

label.style :CSSStyleDeclaration

The CSS style object defining the style of the label.
Default Value:
  • {}
Names
Item Name
Property label.style

(nullable) label.text :string

The text for the label.
Default Value:
  • ""
Names
Item Name
Property label.text

max :number

The maximum value of the gauge.
Default Value:
  • 100
Names
Item Name
Property max
Property change event maxChanged
Property change listener attribute (must be of type function) on-max-changed

metric-label :Object

An object defining the value label.
Names
Item Name
Property metricLabel
Property change event metricLabelChanged
Property change listener attribute (must be of type function) on-metric-label-changed

(nullable) metric-label.converter :oj.Converter.<string>

The converter used to format the labels. When using a converter, scaling should be set to none, as the formatted result may not be compatible with the scaling suffixes.
Default Value:
  • null
Names
Item Name
Property metricLabel.converter

(nullable) metric-label.position :string

Defines the position of the metric label for horizontal and vertical gauges. The default position of the metric label is outside of the plot area. If the label is not rendered, then 'withLabel' will render the metric label outside the plot area. When the label is rendered, all positions are treated as 'withLabel' except 'auto' and 'outsidePlotArea' which render the metric label outside the plot area. When the metric label is rendered 'withLabel', the metric label is displayed with the same style as the label. The position in the 'withLabel' case is specified by the label position attribute.
Supported Values:
Value
"auto"
"center"
"insideIndicatorEdge"
"outsideIndicatorEdge"
"outsidePlotArea"
"withLabel"
Default Value:
  • "auto"
Names
Item Name
Property metricLabel.position

(nullable) metric-label.rendered :string

Defines if the label is rendered. If set to auto, the label is rendered if the orientation is circular.
Supported Values:
Value
"auto"
"off"
"on"
Default Value:
  • "auto"
Names
Item Name
Property metricLabel.rendered

(nullable) metric-label.scaling :string

The scaling behavior of the labels. When using a converter, scaling should be set to none, as the formatted result may not be compatible with the scaling suffixes.
Supported Values:
Value
"auto"
"billion"
"million"
"none"
"quadrillion"
"thousand"
"trillion"
Default Value:
  • "auto"
Names
Item Name
Property metricLabel.scaling

metric-label.style :CSSStyleDeclaration

The CSS style object defining the style of the label.
Default Value:
  • {}
Names
Item Name
Property metricLabel.style

(nullable) metric-label.text :string

The text for the label. If specified, text will overwrite the numeric value that is displayed by default. The converter, scaling, and textType attributes are ignored when text is specified.
Default Value:
  • ""
Names
Item Name
Property metricLabel.text

(nullable) metric-label.text-type :string

Defines whether the label is a number or a percentage of the total value.
Supported Values:
Value
"number"
"percent"
Default Value:
  • "number"
Names
Item Name
Property metricLabel.textType

min :number

The minimum value of the gauge.
Default Value:
  • 0
Names
Item Name
Property min
Property change event minChanged
Property change listener attribute (must be of type function) on-min-changed

orientation :"circular"|"vertical"|"horizontal"

Defines the type of status meter to be rendered.
Supported Values:
Value
"circular"
"horizontal"
"vertical"
Default Value:
  • "horizontal"
Names
Item Name
Property orientation
Property change event orientationChanged
Property change listener attribute (must be of type function) on-orientation-changed

plot-area :Object

Plot Area for Status Meter Guage
Names
Item Name
Property plotArea
Property change event plotAreaChanged
Property change listener attribute (must be of type function) on-plot-area-changed

(nullable) plot-area.border-color :string

The border color of the plot area.
Names
Item Name
Property plotArea.borderColor

(nullable) plot-area.border-radius :string

Defines the border radius of the plot area shape. When set to "auto", the border radius is the same as the top level border radius. Acceptable input follows CSS border-radius attribute specifications.
Default Value:
  • "auto"
Names
Item Name
Property plotArea.borderRadius

(nullable) plot-area.color :string

The color of the plot area. Only applies when useThresholdFillColor is off.
Names
Item Name
Property plotArea.color

(nullable) plot-area.rendered :string

Defines if the plot area is to be rendered. If set to auto, the plot area is rendered if the orientation is circular or if the thresholdDisplay is not onIndicator.
Supported Values:
Value
"auto"
"off"
"on"
Default Value:
  • "auto"
Names
Item Name
Property plotArea.rendered

(nullable) plot-area.svg-class-name :string

The CSS style class to apply to the plot area. The style class and inline style will override any other styling specified through the properties.
Default Value:
  • ""
Names
Item Name
Property plotArea.svgClassName

plot-area.svg-style :CSSStyleDeclaration

The inline style to apply to the plot area. The style class and inline style will override any other styling specified through the properties.
Default Value:
  • {}
Names
Item Name
Property plotArea.svgStyle

readonly :boolean

Defines whether the value of the gauge can be changed by the end user.
Default Value:
  • false
Names
Item Name
Property readonly
Property change event readonlyChanged
Property change listener attribute (must be of type function) on-readonly-changed

reference-lines :Array.<oj.ojStatusMeterGauge.ReferenceLine>

An array of objects with the following properties defining the reference lines for the gauge.
Default Value:
  • []
Names
Item Name
Property referenceLines
Property change event referenceLinesChanged
Property change listener attribute (must be of type function) on-reference-lines-changed

start-angle :number

Specifies the start angle of a gauge with circular orientation. Value should be provided in degrees.
Default Value:
  • 90
Names
Item Name
Property startAngle
Property change event startAngleChanged
Property change listener attribute (must be of type function) on-start-angle-changed

step :number|null

Specifies the increment by which values can be changed by the end user when readonly is false. The step must be a positive value that is smaller than the difference between the min and max. If not specified, the default step is 1/100 if the difference between the min and max.
Names
Item Name
Property step
Property change event stepChanged
Property change listener attribute (must be of type function) on-step-changed

svg-class-name :string

The CSS style class to apply to the gauge indicator. The style class and inline style will override any other styling specified through the properties. For tooltip interactivity, it's recommended to also pass a representative color to the color attribute.
Default Value:
  • ""
Names
Item Name
Property svgClassName
Property change event svgClassNameChanged
Property change listener attribute (must be of type function) on-svg-class-name-changed

svg-style :CSSStyleDeclaration

The inline style to apply to the gauge indicator. The style class and inline style will override any other styling specified through the properties. For tooltip interactivity, it's recommended to also pass a representative color to the color attribute.
Default Value:
  • {}
Names
Item Name
Property svgStyle
Property change event svgStyleChanged
Property change listener attribute (must be of type function) on-svg-style-changed

threshold-display :"currentOnly"|"all"|"onIndicator"

Controls whether the current threshold is displayed on the indicator, in the plotArea, or if all the thresholds are displayed in the plot area.
Supported Values:
Value
"all"
"currentOnly"
"onIndicator"
Default Value:
  • "onIndicator"
Names
Item Name
Property thresholdDisplay
Property change event thresholdDisplayChanged
Property change listener attribute (must be of type function) on-threshold-display-changed

thresholds :Array.<oj.ojStatusMeterGauge.Threshold>

An array of objects with the following properties defining the thresholds for the gauge.
Default Value:
  • []
Names
Item Name
Property thresholds
Property change event thresholdsChanged
Property change listener attribute (must be of type function) on-thresholds-changed

tooltip :Object

An object containing an optional callback function for tooltip customization.
Names
Item Name
Property tooltip
Property change event tooltipChanged
Property change listener attribute (must be of type function) on-tooltip-changed

tooltip.renderer :((context: ojStatusMeterGauge.TooltipContext) => ({insert: Element|string}|{preventDefault: boolean}))

A function that returns a custom tooltip. The function takes a tooltip context argument, provided by the gauge, and should return an object that contains only one of the two properties:
  • insert: HTMLElement | string - An HTML element, which will be appended to the tooltip, or a tooltip string.
  • preventDefault: true - Indicates that the tooltip should not be displayed. It is not necessary to return {preventDefault:false} to display tooltip, since this is a default behavior.
Default Value:
  • null
Names
Item Name
Property tooltip.renderer

track-resize :"on"|"off"

Defines whether the element will automatically render in response to changes in size. If set to off, then the application is responsible for calling refresh to render the element at the new size.
Supported Values:
Value
"off"
"on"
Default Value:
  • "on"
Names
Item Name
Property trackResize
Property change event trackResizeChanged
Property change listener attribute (must be of type function) on-track-resize-changed

(readonly) transient-value :number|null

PREVIEW: This is a preview API. Preview APIs are production quality, but can be changed on a major version without a deprecation path.

The transientValue is the read-only property for retrieving the transient value from the status meter gauge. It is triggered when dragging over the status meter gauge.

This is a read-only property so page authors cannot set or change it directly.

Supports writeback:
  • true
Since:
  • 4.2.0
Names
Item Name
Property transientValue
Property change event transientValueChanged
Property change listener attribute (must be of type function) on-transient-value-changed

translations :object|null

A collection of translated resources from the translation bundle, or null if this component has no resources. Resources may be accessed and overridden individually or collectively, as seen in the examples.

If the component does not contain any translatable resource, the default value of this attribute will be null. If not, an object containing all resources relevant to the component.

If this component has translations, their documentation immediately follows this doc entry.

Names
Item Name
Property translations
Property change event translationsChanged
Property change listener attribute (must be of type function) on-translations-changed

(nullable) translations.component-name :string

Used to describe the data visualization type for accessibility.

See the translations attribute for usage examples.

Default Value:
  • "Gauge"
Names
Item Name
Property translations.componentName

(nullable) translations.label-and-value :string

Used to display a label and its value.

See the translations attribute for usage examples.

Default Value:
  • "{0}: {1}"
Names
Item Name
Property translations.labelAndValue

(nullable) translations.label-clear-selection :string

Text shown for clearing multiple selection on touch devices.

See the translations attribute for usage examples.

Default Value:
  • "Clear Selection"
Names
Item Name
Property translations.labelClearSelection

(nullable) translations.label-count-with-total :string

Used to display a count out of a total.

See the translations attribute for usage examples.

Default Value:
  • "{0} of {1}"
Names
Item Name
Property translations.labelCountWithTotal

(nullable) translations.label-data-visualization :string

Label for data visualizations used for accessibility.

See the translations attribute for usage examples.

Default Value:
  • "Data Visualization"
Names
Item Name
Property translations.labelDataVisualization

(nullable) translations.label-invalid-data :string

Text shown when the component receives invalid data.

See the translations attribute for usage examples.

Default Value:
  • "Invalid data"
Names
Item Name
Property translations.labelInvalidData

(nullable) translations.label-no-data :string

Text shown when the component receives no data.

See the translations attribute for usage examples.

Default Value:
  • "No data to display"
Names
Item Name
Property translations.labelNoData

(nullable) translations.state-collapsed :string

Used to describe the collapsed state for accessibility.

See the translations attribute for usage examples.

Default Value:
  • "Collapsed"
Names
Item Name
Property translations.stateCollapsed

(nullable) translations.state-drillable :string

Used to describe a drillable object for accessibility.

See the translations attribute for usage examples.

Default Value:
  • "Drillable"
Names
Item Name
Property translations.stateDrillable

(nullable) translations.state-expanded :string

Used to describe the expanded state for accessibility.

See the translations attribute for usage examples.

Default Value:
  • "Expanded"
Names
Item Name
Property translations.stateExpanded

(nullable) translations.state-hidden :string

Used to describe the hidden state for accessibility.

See the translations attribute for usage examples.

Default Value:
  • "Hidden"
Names
Item Name
Property translations.stateHidden

(nullable) translations.state-isolated :string

Used to describe the isolated state for accessibility.

See the translations attribute for usage examples.

Default Value:
  • "Isolated"
Names
Item Name
Property translations.stateIsolated

(nullable) translations.state-maximized :string

Used to describe the maximized state for accessibility.

See the translations attribute for usage examples.

Default Value:
  • "Maximized"
Names
Item Name
Property translations.stateMaximized

(nullable) translations.state-minimized :string

Used to describe the minimized state for accessibility.

See the translations attribute for usage examples.

Default Value:
  • "Minimized"
Names
Item Name
Property translations.stateMinimized

(nullable) translations.state-selected :string

Used to describe the selected state for accessibility.

See the translations attribute for usage examples.

Default Value:
  • "Selected"
Names
Item Name
Property translations.stateSelected

(nullable) translations.state-unselected :string

Used to describe the unselected state for accessibility.

See the translations attribute for usage examples.

Default Value:
  • "Unselected"
Names
Item Name
Property translations.stateUnselected

(nullable) translations.state-visible :string

Used to describe the visible state for accessibility.

See the translations attribute for usage examples.

Default Value:
  • "Visible"
Names
Item Name
Property translations.stateVisible

value :number|null

The metric value.
Supports writeback:
  • true
Names
Item Name
Property value
Property change event valueChanged
Property change listener attribute (must be of type function) on-value-changed

visual-effects :"none"|"auto"

Defines whether visual effects such as overlays are applied to the gauge.
Supported Values:
Value
"auto"
"none"
Default Value:
  • "auto"
Names
Item Name
Property visualEffects
Property change event visualEffectsChanged
Property change listener attribute (must be of type function) on-visual-effects-changed

Methods

getMetricLabel() → {string}

Returns the gauge's formatted metric label.
Deprecated:
Since Description
7.0.0 The use of this function is no longer recommended.
Returns:
The formatted metric label.
Type
string

getProperty(property) → {any}

Retrieves the value of a property or a subproperty. The return type will be the same as the type of the property as specified in this API document. If the method is invoked with an incorrect property/subproperty name, it returns undefined.
Parameters:
Name Type Description
property string The property name to get. Supports dot notation for subproperty access.
Since:
  • 4.0.0
Returns:
Type
any
Example

Get a single subproperty of a complex property:

let subpropValue = myComponent.getProperty('complexProperty.subProperty1.subProperty2');

refresh() → {void}

Refreshes the component.
Returns:
Type
void

setProperties(properties) → {void}

Performs a batch set of properties. The type of value for each property being set must match the type of the property as specified in this API document.
Parameters:
Name Type Description
properties Object An object containing the property and value pairs to set.
Since:
  • 4.0.0
Returns:
Type
void
Example

Set a batch of properties:

myComponent.setProperties({"prop1": "value1", "prop2.subprop": "value2", "prop3": "value3"});

setProperty(property, value) → {void}

Sets a property or a subproperty (of a complex property) and notifies the component of the change, triggering a [property]Changed event. The value should be of the same type as the type of the attribute mentioned in this API document.
Parameters:
Name Type Description
property string The property name to set. Supports dot notation for subproperty access.
value any The new value to set the property to.
Since:
  • 4.0.0
Returns:
Type
void
Example

Set a single subproperty of a complex property:

myComponent.setProperty('complexProperty.subProperty1.subProperty2', "someValue");

Type Definitions

Bounds

Properties:
Name Type Description
x number The x position of the bounding rectangle.
y number The y position of the bounding rectangle.
width number The width of the bounding rectangle.
height number The height of the bounding rectangle.

CenterContext

Properties:
Name Type Description
componentElement Element The status meter gauge HTML element.
innerBounds oj.ojStatusMeterGauge.Bounds Object containing (x, y, width, height) of the rectangle inscribed in the center area. The inner bounds are useful for inserting content that is guaranteed to fit within the center area. If the angleExtent isn't 360 then we will provide the clipped square.
metricLabel string The computed metric label.
outerBounds oj.ojStatusMeterGauge.Bounds Object containing (x, y, width, height) of the rectangle circumscribing the center area. The outer bounds are useful for creating background for the entire center area when used with a CSS border-radius. If the angleExtent isn't 360 then we will provide the clipped square.

ReferenceLine

Properties:
Name Type Argument Default Description
color string <optional>
The color of the reference line.
value number <optional>
The value of the reference line.
lineWidth number <optional>
2 The width of the reference line.
lineStyle "dashed" | "dotted" | "solid" <optional>
"solid" The line style of the reference line.

Threshold

Properties:
Name Type Argument Description
borderColor string <optional>
The border color of the threshold.
color string <optional>
The color of the threshold.
max number <optional>
The upper bound of the threshold. This value is ignored for the final threshold, which uses the maximum value of the gauge.
shortDesc string <optional>
Specific description for the threshold and overwrites the shortDesc specified on gauge. This is used for accessibility and also for customizing the tooltip text.

TooltipContext

Properties:
Name Type Description
color string The indicator color of the gauge.
componentElement Element The status meter gauge HTML element.
label string The computed metric label.
parentElement Element The tooltip element. The function can directly modify or append content to this element.