## Function(treeNode, checked, checkTypeFlag, callbackFlag)zTreeObj.checkNode

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

Check or unCheck a single node. It is valid when [setting.check.enable = true]

Use checkNode() method of zTree v3.x can trigger 'beforeCheck' or 'onCheck' callback function. for reduce redundant code.

Please use zTree object to executing the method.

### Function Parameter Descriptions

#### treeNode JSON

JSON data object of the node which need to be checked or unchecked.

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

#### checked Boolean

checked = true means: check node.

checked = false means: uncheck node.

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

Don't affect the node which 'nochecked' attribute is true.

#### checkTypeFlag Boolean

checkTypeFlag = true means: According to 'setting.check.chkboxType' attribute automatically check or uncheck the parent and child nodes.

checkTypeFlag = false means: only check or uncheck this node, don't affect its parent and child nodes.

When checkTypeFlag = false and treeNode.checked = checked, will not trigger callback function.

Don't affect the parent and child nodes which 'nochecked' attribute is true.

#### callbackFlag Boolean

callbackFlag = true means: call this method, will trigger 'beforeCheck' & 'onCheck' callback.

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

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

#### Return none

no return value

### Examples of function

#### 1. check the selected nodes

    var treeObj = $.fn.zTree.getZTreeObj("tree");
    var nodes = treeObj.getSelectedNodes();
    for (var i=0, l=nodes.length; i < l; i++) {
    	treeObj.checkNode(nodes[i], true, true);
    }