treeNodeJSON

JSON data object of the node which will be expanded or collapsed

Please ensure that this data object is an internal node data object in zTree.

expandFlagBoolean

expandFlag = true means: expand the node.

expandFlag = false means: collapse the node.

If this parameter is omitted, then toggle expand or collapse depend this node's expanded state.

sonSignBoolean

sonSign = true means: expand or collapse all of the child nodes depend the 'expandFlag' parameter.

sonSign = false means: only expand or collapse this node.

When sonSign = false and treeNode.open = expandFlag, will not trigger the callback.

If this parameter is omitted, it is same as 'sonSign = false'.

focusBoolean

focus = true means: after expand or collapse, set the focus of this node for view.

focus = false means: after expand or coolapse, don't set the focus of this node.

If this parameter is omitted, it is same as 'focus = true'.

callbackFlagBoolean

callbackFlag = true means: call this method, will trigger 'beforeExpand / onExpand' or 'beforeCollapse / onCollapse' callback.

callbackFlag = false means: call this method, will not trigger callback.

If this parameter is omitted, it is same as 'callbackFlag = false'

Return Boolean

return the result of expand or collapse.

true means: expand node

false means: collapse node

null means: the node is not parent node.

var treeObj = $.fn.zTree.getZTreeObj("tree");
var nodes = treeObj.getSelectedNodes();
if (nodes.length>0) {
	treeObj.expandNode(nodes[0], true, true, true);
}