I'm trying to validate a DateField with a custom validation function that
checks if the value of the field is parsed correctly into a Date Object and
is not null. Here is my validation function:
var dateValidator = function(value) {
return (value != null);
}
That works fine so far. The problem is now that the field is not required,
the user is allowed to leave it empty. But in this case the value is also
null and I cannot determine if the field was intentionally left blank or if
the parsing to a date object has failed, because the user has entered a bad
string into the date field.
Is there a way to validate it only if the user has entered something?
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