Check documentation for the latest version of dhtmlxSuite onBeforeChange DHTMLX Docs

onBeforeChange

fires before the user clicks on a date in one of the calendar instances

void onBeforeChange(string side,Date date){ ... };

Parameters

sidestring"left" or "right"
dateDateclicked date

Example

myCalendar.attachEvent("onBeforeChange",function(side, date){
    // your code here
    return true; // allow selection
});

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