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dhtmlxScheduler questions

i wonder if it could prevent from creating new event earlier than today, i tried to attach event but it doesn't work

scheduler.attachEvent("onEventAdded", function(event_id,event_object){
//any custom logic here
if(event_object.start_date<new Date()){
    alert("You can not create an event earlier than today!");
    scheduler.deleteEvent(event_id);
    return false;
}
});

onEventAdded is not blocable. You can change the date of event from it, by moving it in future, but it not possible to block event adding.