## Function(parentNode, reloadType, isSilent, callback)zTreeObj.reAsyncChildNodes

### Overview[ depends on jquery.ztree.core js ]

Forced asynchronous loading child nodes of parent node. It is valid when [setting.async.enable = true]

You can use this method to reload child nodes.

Please use zTree object to executing the method.

### Function Parameter Descriptions

#### parentNode JSON

The parent node which will asynchronous loading child nodes.

1. If parentNode = null, it is same as reload root nodes.

2. If parentNode.isParent = false, don't load nodes.

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

#### reloadType String

reloadType = "refresh" means: reload child nodes.

reloadType != "refresh" means: append to load child nodes.

#### isSilent Boolean

Set whether to automatically expand the parent node, after load nodes.

isSilent = true means: don't auto expand the parent node. Otherwise auto expand.

#### callback function

zTree will trigger this callback() function after reAsyncChildNodes()

#### Return none

no return value

### Examples of function

#### 1. reload root nodes

    var treeObj = $.fn.zTree.getZTreeObj("tree");
    treeObj.reAsyncChildNodes(null, "refresh");

#### 2. reload the first selected node's child nodes.

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