onBeforeCheck

fires before an item's checkbox is checked/unchecked, cancelable

id	string|number	the item's id
state	boolean	current state of the checkbox

boolean

true to allow operation

Example

myTreeView.attachEvent("onBeforeCheck", function(id, state){
    // your code here
    return true;
});

the event is blockable: returning false will block the checkbox's checking

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