Knob

Knob

new Knob(optionsopt)

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Properties:
Name Type Attributes Default Description
options.reset Number <optional>

Reset to this value on double click.
options.bind_dblclick boolean <optional>
 true

If true, bind the dblclick event to reset the value to the reset option.
options.hand Object <optional>
 {width: 1, length: 12, margin: 24}
options.margin Number <optional>
 13
options.thickness Number <optional>
 6
options.step Number <optional>
 1
options.shift_up Number <optional>
 4
options.shift_down Number <optional>
 0.25
options.dots_defaults Object <optional>
 {length: 6, margin: 13, width: 2}
options.markers_defaults Object <optional>
 {thickness: 6, margin: 13}
options.labels_defaults Object <optional>
 {margin: 10, align: "outer", format: function(val){return val;}}
options.basis Number <optional>
 300

Distance to drag between min and max.
options.preset String <optional>
 "medium"

The preset to use. Presets are a functionality of Widget.
[options.presets={ tiny: {margin:0, thickness:4, hand:{width: 1, length: 6, margin: 8}, dots_defaults:{length:4, margin:0, width:1}, markers_defaults: {thickness: 2, margin: 0}, show_labels:false}, small: {margin:0, thickness:5, hand:{width: 1, length: 8, margin: 10}, dots_defaults: {length:5, margin:0,width:1}, markers_defaults: {thickness: 2, margin: 0}, show_labels:false}, medium: {}, large: {hand:{width:1.5, length:12, margin:26}}, huge: {hand:{width:2, length:12, margin:28}}, }] Object

A set of available presets. Presets are a functionality of Widget.

Knob is a Circular inside of an SVG which can be modified both by dragging and scrolling utilizing DragValue and ScrollValue. It inherits all options of Circular and DragValue. The options listed below consist of options from the contained widgets, only showing the default values.

Parameters:
Name Type Attributes Default Description
options Object <optional>
 { }

An object containing initial options.

Extends

Members

circular :Circular

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The Circular module.

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drag :DragValue

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Instance of DragValue used for the interaction.

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drag :DragValue

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Instance of DragValue used for interaction.

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element :HTMLDivElement

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The main DIV container. Has class .aux-knob.

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  • HTMLDivElement

scroll :ScrollValue

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Instance of ScrollValue used for the interaction.

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scroll :ScrollValue

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Instance of ScrollValue used for interaction.

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svg :SVGImage

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The main SVG image.

Type:
  • SVGImage

Methods

addChild(child)

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Registers a widget as a child widget. This method is used to build up the widget tree. It does not modify the DOM tree.

Parameters:
Name Type Description
child Widget

The child to add.
Fires:
  • Widget#event:child_added

addChildren(a)

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Registers an array of widgets as children.

Parameters:
Name Type Description
a Array.<Widget>

An array of Widgets.

addLabel()

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This is an alias for Circular#addLabel of the internal circular instance.

allChildren()

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Returns an array of all children.

appendChild(child)

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Appends child.element to the widget element and registers child as a child widget.

Parameters:
Name Type Description
child Widget

The child widget to append.

appendChildren(children)

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Calls Widget#appendChild for an array of widgets.

Parameters:
Name Type Description
children Array.<Widget>

The child widgets to append.

disableTansitions()

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Disable CSS transitions.

enableDraw()

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Schedules this widget for drawing.

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enableDrawChildren()

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Enables rendering for all children of this widget.

enableTransitions()

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Enable CSS transitions.

forceHide()

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Hide the widget immediately by applying the class aux-hide. Does not call disableDraw().

forceShow()

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Show the widget immediately by applying the class aux-show. Does not call enableDraw().

getStyle()

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Returns the computed style of this widget's DOM element.

hidden()

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Returns the current hidden status.

hide()

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Hide the widget. This will result in the class aux-hide being applied to this widget in the next rendering step.

invalidate(key)

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Invalidates an option and triggers a redraw() call.

Parameters:
Name Type Description
key string

observeResize(cb)

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Calls a callback whenever the widget resizes. This method will trigger one resize.

Parameters:
Name Type Description
cb function

removeChild(child)

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Removes a child widget. Note that this method only modifies the widget tree and does not change the DOM.

Parameters:
Name Type Description
child Widget

The child to remove.
Fires:
  • Widget#event:child_removed

removeChildren(a)

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Removes an array of children.

Parameters:
Name Type Description
a Array.<Widget>

An array of Widgets.

removeLabel()

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This is an alias for Circular#removeLabel of the internal circular instance.

set(key, value)

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Sets an option.

Parameters:
Name Type Description
key string

The option name.
value

The option value.

setStyle()

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Sets a CSS style property in this widget's DOM element.

show()

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Make the widget visible. This will apply the class aux-show during the next rendering step.

toggleHidden()

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Toggle the hidden status. This is equivalent to calling hide() or show(), depending on the current hidden status of this widget.

transitionsDisabled()

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Returns true if transitions are currently disabled on this widget.

visibleChildren()

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Returns an array of all visible children.

Events

destroy

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Is fired when a widget is destroyed.

doubleclick

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Is fired when the knob receives a double click in order to reset to initial value.

Parameters:
Name Type Description
value number

The value of the widget.

GenericDOMEvents

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Generic DOM events. Please refer to W3Schools for further details.

hide

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The hide event is emitted when a widget is hidden and is not rendered anymore. This happens both with browser visibility changes and also internally when using layout widgets such as Pager.

initialized

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Is fired when a widget is initialized.

redraw

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The redraw event is emitted when a widget is redrawn. This can be used to do additional DOM modifications to a Widget.

resize

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The resize event is emitted whenever a widget is being resized. This event can be used to e.g. measure its new size. Note that some widgets do internal adjustments after the resize event. If that is relevant, the Widget#resized event can be used instead.

resized

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The resized event is emitted after each rendering frame, which was triggered by a resize event.

set

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The set event is emitted when an option was set using the Widget#set method. The arguments are the option name and its new value.

Note that this happens both for user interaction and programmatical option changes.

show

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The show event is emitted when a widget is shown and is being rendered. This is the counterpart to Widget#hide.

useraction

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The useraction event is emitted when a widget gets modified by user interaction. The event is emitted for the option value.

Parameters:
Name Type Description
name string

The name of the option which was changed due to the users action
value mixed

The new value of the option

visibility

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Is fired when the visibility state changes. The first argument is the visibility state, which is either true or false.