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.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.

options.title String <optional>
""

A string to be set as title attribute on the main element to be displayed as tooltip. (Defined in Widget)

options.disabled Boolean <optional>
false

Toggles the class .aux-disabled. By default it disables all pointer events on the widget via CSS to make it unusable to the user. (Defined in Widget)

options.active Boolean <optional>

Toggles the class .aux-inactive. (Defined in Widget)

options.visible Boolean <optional>

Toggles the class .aux-hide and .aux-show. This option also enables and disabled rendering by calling Widget#hide and Widget#show. (Defined in Widget)

options.needs_resize Boolean <optional>
true

Set to true if the resize function shall be called before the next redraw. (Defined in Widget)

options.dblclick Boolean <optional>
400

Set a time in milliseconds for triggering double click event. If 0, no double click events are fired. (Defined in Widget)

options.presets Object <optional>
{}

An object with available preset specific options. Refer to options.preset for more information. (Defined in 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.

Type:
  • 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

add_child(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

add_children(a)

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Registers an array of widgets as children.

Parameters:
Name Type Description
a Array.<Widget>

An array of Widgets.

add_label()

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

addEventListener(event, func)

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Register an event handler.

Parameters:
Name Type Description
event string

The event descriptor.

func function

The function to call when the event happens.

all_children()

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Returns an array of all children.

append_child(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.

append_children(children)

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Calls Widget#append_child for an array of widgets.

Parameters:
Name Type Description
children Array.<Widget>

The child widgets to append.

delegate_events(element) → {HTMLElement}

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Delegates all occuring DOM events of a specific DOM node to the widget. This way the widget fires e.g. a click event if someone clicks on the given DOM node.

Parameters:
Name Type Description
element HTMLElement

The element all native events of the widget should be bound to.

Fires:
Returns:

The element

Type
HTMLElement

destroy()

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Destroys all event handlers and the options object.

dispatchEvent(event, …args)

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Fires an event.

Parameters:
Name Type Attributes Description
event string

The event descriptor.

args * <repeatable>

Event arguments.

enable_draw()

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Schedules this widget for drawing.

Fires:

enable_draw_children()

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Enables rendering for all children of this widget.

force_hide()

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

force_show()

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

get(key)

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Get the value of an option.

Parameters:
Name Type Description
key string

The option name.

get_default()

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Returns the default value of a given option. If the option does not exist, an exception is thrown.

get_option_type()

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Returns the type of an option. If the given option does not exist, 'undefined' is returned.

get_style()

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

has_event_listeners(event) → {boolean}

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Test if the event descriptor has some handler functions in the queue.

Parameters:
Name Type Description
event string

The event desriptor.

Returns:

True if the event has some handler functions in the queue, false if not.

Type
boolean

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.

off(event, fun)

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Removes the given function from the event queue. If it is a native DOM event, it removes the DOM event listener as well.

Parameters:
Name Type Description
event string

The event descriptor.

fun function

The function to remove.

remove_child(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

remove_children(a)

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Removes an array of children.

Parameters:
Name Type Description
a Array.<Widget>

An array of Widgets.

remove_label()

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

reset(key)

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Resets an option to its default value.

Parameters:
Name Type Description
key string

The option name.

set(key, value)

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Sets an option.

Parameters:
Name Type Description
key string

The option name.

value

The option value.

set_options(optionsopt)

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Merges a new options object into the existing one, including deep copies of objects. If an option key begins with the string "on" it is considered an event handler. In this case the value should be the handler function for the event with the corresponding name without the first "on" characters.

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

An object containing initial options.

set_style()

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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.

toggle_hidden()

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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.

update(key, value)

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Conditionally sets an option unless it already has the requested value.

Parameters:
Name Type Description
key string

The name of the option.

value mixed

The value of the option.

Fires:

userset(key, value)

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Sets an option by user interaction. Emits the userset event. The userset event can be cancelled (if an event handler returns false), in which case the option is not set. Returns true if the option was set, false otherwise. If the option was set, it will emit a useraction event.

Parameters:
Name Type Description
key string

The name of the option.

value mixed

The value of the option.

Fires:
  • Base#event:userset
  • Base#event:useraction

visible_children()

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Returns an array of all visible children.

Events

delegated

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Is fired when an element is delegated.

Parameters:
Name Type Description
element HTMLElement | Array

The element which receives all native DOM events.

old_element HTMLElement | Array

The element which previously received all native DOM 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.

set_[option]

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Is fired when an option is set.

Parameters:
Name Type Description
value mixed

The value of the option.

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.