onBeforeAdd

fires before item adding is initiated

obj	object	an object which will be added
index	index	index, at which item will be added, optional

boolean

true - to trigger the default action, false - to block it

Example

myList.attachEvent("onBeforeAdd", function (obj, index){
    // your code here
    return true;
});

the event is blockable, if the false value is returned from the custom method, the default reaction will be blocked

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