Drag

Drag

new Drag(optionsopt)

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Properties:
Name Type Attributes Default Description
options.node HTMLElement | SVGElement

The element to drag.

options.handle HTMLElement | SVGElement <optional>

A DOM node to be used as a handle. If not set, options.node is used.

options.active Boolean <optional>
true

Enable or disable dragging

options.min Object | Boolean <optional>
{x: false, y: false}

Object containing the minimum positions for x and y. A value of false is interpreted as no minimum.

options.max Object | Boolean <optional>
{x: false, y: false}

Object containing the maximum positions for x and y. A value of false is interpreted as no maximum.

options.initial Number <optional>
2

Number of pixels the user has to move until dragging starts.

options.transform Boolean <optional>
false

Use CSS transformations instead of absolute positioning.

Drag enables dragging of elements on the screen positioned absolutely or by CSS transformation.

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

An object containing initial options.

Extends

Methods

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.

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.

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.

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

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.

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. Fires both the events set with arguments key and value; and the event 'set_'+key with arguments value and key.

Parameters:
Name Type Description
key string

The name of the option.

value mixed

The value of the option.

Fires:

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.

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

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.

dragging

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The user is dragging this item.

Parameters:
Name Type Description
event DOMEvent

The native DOM event.

initialized

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Is fired when an instance is initialized.

set

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Is fired when an option is set.

Parameters:
Name Type Description
name string

The name of the option.

value mixed

The value of the option.

set_[option]

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Is fired when an option is set.

Parameters:
Name Type Description
value mixed

The value of the option.

startdrag

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The user started dragging this item.

Parameters:
Name Type Description
event DOMEvent

The native DOM event.

stopdrag

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The user stopped dragging this item.

Parameters:
Name Type Description
event DOMEvent

The native DOM event.