TreeView

Description

A hierarchical list whose items can contain child items.

The?ListItem?children of this control (in the?items?array) can be of type node, which means that they can contain child items. An item with child items can expanded, so that the child items are displayed, or collapsed, so that the child items are hidden Individual items can be selected at any level of the tree.

Properties

active readonly	True if this element is active.
alignment readonly	The alignment style for this element. If defined, this value overrides the alignChildren setting for the parent container.
bounds readonly	The boundaries of the element, in parent-relative coordinates.
children readonly	An array of child elements.
enabled readonly	True if this element is enabled.
graphics readonly	The graphics object that can be used to customize the element’s appearance, in response to the?onDraw()?event.
helpTip readonly	The help text that is displayed when the mouse hovers over the element.
indent readonly	The number of pixels to indent the element during automatic layout.
itemSize readonly	The width and height in pixels of each item in the list.
items readonly	The array of top-level items displayed in the list.
location readonly	The upper left corner of this element relative to its parent.
maximumSize readonly	The maximum height and width to which the element can be resized.
minimumSize readonly	The minimum height and width to which the element can be resized.
parent readonly	The parent element.
preferredSize readonly	The preferred size, used by layout managers to determine the best size for each element.
properties readonly	An object that contains one or more creation properties of the control (properties used only when the element is created).
selection readonly	The currently selected list item.
shortcutKey readonly	The key sequence that invokes the?onShortcutKey()?callback for this element (in Windows only).
size readonly	The current dimensions of this element.
type readonly	The element type, “treeview”.
visible readonly	True if this element is shown, false if it is hidden.
window readonly	The window that this element belongs to.
windowBounds readonly	The bounds of this element relative to the top-level parent window.

Methods

add readonly	Adds an item to the top-level choices in this list.
addEventListener readonly	Registers an event handler for a particular type of event occuring in this element.
dispatchEvent readonly	Simulates the occurrence of an event in this target.
find readonly	Retrieves an item object from the list that has a given text label.
hide readonly	Hides this element.
notify readonly	Sends a notification message, simulating the specified user interaction event.
remove readonly	Removes a child item from the list.
removeAll readonly	Removes all child items from the list.
removeEventListener readonly	Unregisters an event handler for a particular type of event occuring in this element.
show readonly	Shows this element.

Events

onActivate readonly	An event-handler callback function, called when the element acquires the keyboard focus.
onChange readonly	An event-handler callback function, called when the content of the element has been changed
onCollapse readonly	An event-handler callback function, called when the user collapses (closes) an expanded node in the treeview.
onDeactivate readonly	An event-handler callback function, called when the element loses the keyboard focus.
onDraw readonly	An event-handler callback function, called when the window is about to be drawn.
onExpand readonly	An event-handler callback function, called when the user expands (opens) a collapsed node in the treeview.
onShortcutKey readonly	An event-handler callback function, called when the element’s?shortcutKey?sequence is typed in the active window.