Yahoo! UI Library

TreeView Widget 

Yahoo! UI Library > treeview > YAHOO.widget.TreeView

Class YAHOO.widget.TreeView - uses YAHOO.util.EventProvider

Contains the tree view state data and the root node.

Constructor

YAHOO.widget.TreeView ( id )
Parameters:
id <string|HTMLElement> The id of the element, or the element itself that the tree will be inserted into.

Properties

_animCount - private int

The current number of animations that are executing

_collapseAnim - private string

The animation to use for collapsing children, if any

_el - private object

The host element for this tree

_expandAnim - private string

The animation to use for expanding children, if any

_nodes - private Node[]

Flat collection of all nodes in this tree

id - String

The id of tree container element

locked - boolean

We lock the tree control while waiting for the dynamic loader to return

maxAnim - int

The maximum number of animations to run at one time.

YAHOO.widget.TreeView.counter - private static object

Counter for generating a new unique element id

YAHOO.widget.TreeView.nodeCount - static int

Count of all nodes in all trees

YAHOO.widget.TreeView.trees - private static Array

Global cache of tree instances

Properties inherited from YAHOO.util.EventProvider:

__yui_events, __yui_subscribers

Methods

_deleteNode

private void _deleteNode ( )
Deletes the node and recurses children
Returns: void

animateCollapse

boolean animateCollapse ( el , node )
Perform the collapse animation if configured, or just show the element if not configured or too many animations are in progress
Parameters:
el <HTMLElement> the element to animate
node <YAHOO.util.Node> the node that was expanded
Returns: boolean
true if animation could be invoked, false otherwise

animateExpand

boolean animateExpand ( el , node )
Perform the expand animation if configured, or just show the element if not configured or too many animations are in progress
Parameters:
el <HTMLElement> the element to animate
node <YAHOO.util.Node> the node that was expanded
Returns: boolean
true if animation could be invoked, false otherwise

collapseAll

void collapseAll ( )
Collapses all expanded child nodes in the entire tree.
Returns: void

collapseComplete

void collapseComplete ( )
Function executed when the collapse animation completes
Returns: void

draw

void draw ( )
Renders the tree boilerplate and visible nodes
Returns: void

expandAll

void expandAll ( )
Expands all child nodes. Note: this conflicts with the "multiExpand" node property. If expand all is called in a tree with nodes that do not allow multiple siblings to be displayed, only the last sibling will be expanded.
Returns: void

expandComplete

void expandComplete ( )
Function executed when the expand animation completes
Returns: void

generateId

private void generateId ( )
Generates an unique id for an element if it doesn't yet have one
Returns: void

getEl

HTMLElement getEl ( )
Returns the tree's host element
Returns: HTMLElement
the host element

getNodeByIndex

Node getNodeByIndex ( nodeIndex )
Returns a node in the tree that has the specified index (this index is created internally, so this function probably will only be used in html generated for a given node.)
Parameters:
nodeIndex <int> the index of the node wanted
Returns: Node
the node with index=nodeIndex, null if no match

getNodeByProperty

Node getNodeByProperty ( property , value )
Returns a node that has a matching property and value in the data object that was passed into its constructor.
Parameters:
property <object> the property to search (usually a string)
value <object> the value we want to find (usuall an int or string)
Returns: Node
the matching node, null if no match

getNodesByProperty

Array getNodesByProperty ( property , value )
Returns a collection of nodes that have a matching property and value in the data object that was passed into its constructor.
Parameters:
property <object> the property to search (usually a string)
value <object> the value we want to find (usuall an int or string)
Returns: Array
the matching collection of nodes, null if no match

getRoot

Node getRoot ( )
Returns the root node of this tree
Returns: Node
the root node

init

private void init ( )
Initializes the tree
Returns: void

onCollapse

void onCollapse ( node )
Abstract method that is executed when a node is collapsed.
Parameters:
node <Node> the node that was collapsed.
Returns: void
Deprecated use treeobj.subscribe("collapse") instead

onExpand

void onExpand ( node )
Abstract method that is executed when a node is expanded
Parameters:
node <Node> the node that was expanded
Returns: void
Deprecated use treeobj.subscribe("expand") instead

popNode

void popNode ( the )
Removes the node from the tree, preserving the child collection to make it possible to insert the branch into another part of the tree, or another tree.
Parameters:
the <Node> node to remove
Returns: void

regNode

private void regNode ( node )
Nodes register themselves with the tree instance when they are created.
Parameters:
node <Node> the node to register
Returns: void

removeChildren

void removeChildren ( node )
Deletes this nodes child collection, recursively. Also collapses the node, and resets the dynamic load flag. The primary use for this method is to purge a node and allow it to fetch its data dynamically again.
Parameters:
node <Node> the node to purge
Returns: void

removeNode

boolean removeNode ( The , autoRefresh )
Removes the node and its children, and optionally refreshes the branch of the tree that was affected.
Parameters:
The <Node> node to remove
autoRefresh <boolean> automatically refreshes branch if true
Returns: boolean
False is there was a problem, true otherwise.

setCollapseAnim

void setCollapseAnim ( the )
Sets up the animation for collapsing children
Parameters:
the <string> type of animation (acceptable values defined in YAHOO.widget.TVAnim)
Returns: void

setDynamicLoad

void setDynamicLoad ( fnDataLoader , iconMode )
Configures this tree to dynamically load all child data
Parameters:
fnDataLoader <function> the function that will be called to get the data
iconMode <int> configures the icon that is displayed when a dynamic load node is expanded the first time without children. By default, the "collapse" icon will be used. If set to 1, the leaf node icon will be displayed.
Returns: void

setExpandAnim

void setExpandAnim ( type )
Sets up the animation for expanding children
Parameters:
type <string> the type of animation (acceptable values defined in YAHOO.widget.TVAnim)
Returns: void

setUpLabel

void setUpLabel ( oData )
Sets up the node label
Parameters:
oData <object> string containing the label, or an object with a label property
Returns: void

toString

string toString ( )
TreeView instance toString
Returns: string
string representation of the tree

YAHOO.widget.TreeView.addHandler

static void YAHOO.widget.TreeView.addHandler ( el , sType , fn )
Add a DOM event
Parameters:
el <object> the elment to bind the handler to
sType <string> the type of event handler
fn <function> the callback to invoke
Returns: void

YAHOO.widget.TreeView.getNode

static Node YAHOO.widget.TreeView.getNode ( treeId , nodeIndex )
Global method for getting a node by its id. Used in the generated tree html.
Parameters:
treeId <String> the id of the tree instance
nodeIndex <String> the index of the node to return
Returns: Node
the node instance requested, null if not found

YAHOO.widget.TreeView.getTree

static TreeView YAHOO.widget.TreeView.getTree ( treeId )
Global method for getting a tree by its id. Used in the generated tree html.
Parameters:
treeId <String> the id of the tree instance
Returns: TreeView
the tree instance requested, null if not found.

YAHOO.widget.TreeView.preload

static void YAHOO.widget.TreeView.preload ( prefix )
Attempts to preload the images defined in the styles used to draw the tree by rendering off-screen elements that use the styles.
Parameters:
prefix <string> the prefix to use to generate the names of the images to preload, default is ygtv
Returns: void

YAHOO.widget.TreeView.removeHandler

static void YAHOO.widget.TreeView.removeHandler ( el , sType , fn )
Remove a DOM event
Parameters:
el <object> the elment to bind the handler to
sType <string> the type of event handler
fn <function> the callback to invoke
Returns: void

Methods inherited from YAHOO.util.EventProvider:

createEvent, fireEvent, hasEvent, subscribe, unsubscribe

Events

animComplete

animComplete ( node )
When animation is enabled, this event fires when the animation completes
Parameters:
node <YAHOO.widget.Node> the node that is expanding/collapsing

animStart

animStart ( node )
When animation is enabled, this event fires when the animation starts
Parameters:
node <YAHOO.widget.Node> the node that is expanding/collapsing

collapse

collapse ( node )
Fires when a node is going to be collapsed. Return false to stop the collapse.
Parameters:
node <YAHOO.widget.Node> the node that is collapsing

collapseComplete

collapseComplete ( node )
Fires after a node is successfully collapsed. This event will not fire if the "collapse" event was cancelled.
Parameters:
node <YAHOO.widget.Node> the node that was collapsed

expand

expand ( node )
Fires when a node is going to be expanded. Return false to stop the collapse.
Parameters:
node <YAHOO.widget.Node> the node that is expanding

expandComplete

expandComplete ( node )
Fires after a node is successfully expanded. This event will not fire if the "expand" event was cancelled.
Parameters:
node <YAHOO.widget.Node> the node that was expanded

labelClick

labelClick ( node )
Custom event that is fired when the text node label is clicked. The custom event is defined on the tree instance, so there is a single event that handles all nodes in the tree. The node clicked is provided as an argument
Parameters:
node <YAHOO.widget.Node> the node clicked

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