addcheck

Option	Explanation
boolean	When user attempts to add a row, allows for checking permissions etc. Returns a boolean.

Parameters	Type	Explanation
this	Object	dropzone object
treebeard	Object	treebeard object
item	Object	item the file was added to
file	Object	file that was added

###Example:

var options ={
    ...
     addcheck : function (treebeard, item, file) {
                if(!item.children){
                    alert("No kids allowed.");
                    return false;
                }
                else{
                    window.console.log("Add check", this, treebeard, item, file);
                    return true;
                }
            },
    ...
}