## Function(treeId, parentNode, responseData)setting.async.dataFilter

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

Callback function to pre-process Ajax return data. It is valid when [setting.async.enable = true]

Default: null

### Function Parameter Descriptions

#### treeId String

zTree unique identifier: treeId

#### parentNode JSON

Parent node's JSON data object

When asynchronously loading the root, the parentNode = null

#### responseData Array(JSON) / JSON / String

Array (JSON) / JSON / String data objects

From v3.4, support XML strings.

#### Return Array(JSON) / JSON

The return value should be the JSON data structure which is supported by the zTree.

v3.x supports to load single node JSON data object.

### Examples of setting & function

#### 1. Modify the node name attributes returned by an Ajax request.

    function ajaxDataFilter(treeId, parentNode, responseData) {
        if (responseData) {
          for(var i =0; i < responseData.length; i++) {
            responseData[i].name += "_filter";
          }
        }
        return responseData;
    };
    var setting = {
    	async: {
    		enable: true,
    		url: "http://host/getNode.php",
    		dataFilter: ajaxDataFilter
    	}
    };
    ......