TK.Expander

new Expander(options)

TK.Expander is a container which can be toggled between two different states, expanded and collapsed. It can be used to implement overlay popups, but it is not limited to that application. In expanded mode the container has the class toolkit-expanded. Child widgets are shown or hidden depending on the state of the two pseudo options _expanded and _collapsed. If a child widget of the expander has _expanded set to true it will be shown in expanded state. If a child widget has _collapsed set to false, it will be shown in collapsed state. This feature can be used to make interfaces more reactive.

Parameters:
Name Type Description
options Object
Properties
Name Type Attributes Default Description
icon String <optional>
""

Icon of the TK.Button which toggles expand state.

Properties:
Name Type Attributes Default Description
options.expanded boolean <optional>
false

This is the state of this widget.

options.always_expanded boolean <optional>
false

This essentially overwrites the expanded option. This can be used to switch this widget to be always expanded, e.g. when the screen size is big enough.

options.group string <optional>
""

If set, this expander is grouped together with all other expanders of the same group name. At most one expander of the same group can be open at one time.

options.group_default boolean <optional>
false

If set, this expander is expanded if all other group members are collapsed.

Source:

Extends

Members

button :TK.Button

The button for toggling the state of the expander.

Source:

element :HTMLDivElement

The main DIV container. Has class toolkit-expander.

Overrides:
Source:

Methods inherited from TK.Container

append_child(child)

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

append_children(children)

Calls TK.Container#append_child for an array of widgets.

force_hide()

Immediately switches the display state of this container to hide. Unlike TK.Container#hide this method does not perform the hiding transition and immediately modifies the DOM by setting the toolkit-hide class.

force_show()

Immediately switches the display state of this container to show. Unlike TK.Container#hide this method does not perform the hiding transition and immediately modifies the DOM by setting the toolkit-show class.

hide()

Starts the transition of the display_state to hide.

hide_child(child)

Switches the hidden state of a child to hidden. The argument is either the child index or the child itself.

show()

Starts the transition of the display_state to show.

show_child(child)

Switches the hidden state of a child to shown. The argument is either the child index or the child itself.

toggle_child(child)

Toggles the hidden state of a child. The argument is either the child index or the child itself.

Methods inherited from TK.Widget

add_child(child)

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

add_children(a)

Registers an array of widgets as children.

all_children()

Returns an array of all children.

enable_draw()

Schedules this widget for drawing.

get_style()

Returns the computed style of this widgets DOM element.

hidden()

Returns the current hidden status.

remove_child(child)

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

remove_children(a)

Removes an array of children.

set(key, value)

Sets an option.

set_style()

Sets a CSS style property in this widgets DOM element.

toggle_hidden()

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

visible_children()

Returns an array of all visible children.

widgetize()

Set the DOM elements of this widgets. This method is usually only used internally. Basically it means to add the id from options and set a basic CSS class. If delegate is true, basic events will be delegated from the element to the widget instance if classify is true, CSS functions will be bound to the widget instance.

Methods inherited from TK.Base

add_event(event, func, prevent, stop)

Register an event handler.

add_events(events, func)

Add multiple event handlers at once, either as dedicated event handlers or a list of event descriptors with a single handler function.

delegate_events(element) → {HTMLElement}

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.

destroy()

Destroys all event handlers and the options object.

fire_event(event, …args)

Fires an event.

fire_events(events)

Fires several events.

get(key)

Get the value of an option.

has_event_listeners(event) → {boolean}

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

remove_event(event, func)

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

remove_events(events, func)

Remove multiple event handlers at once, either as dedicated event handlers or a list of event descriptors with a single handler function.

set_options(optionsopt)

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 as event handler. In this case the value should be the handler function for the event with the corresponding name without the first "on" characters.

Events

collapse

Is fired when the expander collapses.

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expand

Is fired when the expander expands.

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Events inherited from TK.Container

hide

Is fired when the container is hidden.

show

Is fired when the container is shown.

Events inherited from TK.Widget

classified

Is fired when a widget is classified.

destroy

Is fired when a widget is destroyed.

initialized

Is fired when a widget is initialized.

redraw

Is fired when a redraw is executed.

resize

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 TK.Widget#resized event can be used, instead.

resized

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

set

The set event is emitted when an option was set using the TK.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.

stylized

Is fired when a widget is stylized.

widgetize

Is fired when a widget is widgetized.

Events inherited from TK.Base

delegated

Is fired when an element is delegated.

set_[option]

Is fired when an option is set.