ZTREE DEMO - beforeCheck / onCheck

1, 'beforeCheck / onCheck' callback function

Use 'beforeCheck / onCheck' callback function can control whether to allow changes to the node check state. This simple demo shows how to monitor the check event.
By the way also demonstrates how to use the 'checkNode' method triggers 'beforeCheck / onCheck' callback, Try:
Whether trigger the callback when execution checkNode() method.
[ check ] [ uncheck ]
How to use 'zTreeObj.checkNode' method, please see the API documentation.
beforeCheck / onCheck log: