expand Method |
This method expands the root node or the selected node of the tree by one level.
Syntax
treeID.root.expand()
When called from a node other than root, the syntax is as follows:
treeNode.expand()
Return Value
No return value.
Remarks
The operation should be performed only on a parent tree node item (item with a "+" symbol before it indicating that it can be expanded).
When this function is called, the node is expanded, and any function associated with the onexpand property of the tree item is fired. Once expanded, the tree item has a "-" symbol in place of "+" indicating that it is already expanded.
The expand method is automatically called, and the function associated with onexpand property is also be fired when a tree node is double-clicked.
Example
The following example shows how the above method is used.
//Function called on onselect property of a tree item
function onselectHandler(selectedNode)
{
//Expand the node
selectedNode.expand();
}