Open

<input id="datepicker" />
<script>
$("#datepicker").kendoDatePicker({
    open: function(e) {
        e.preventDefault(); //prevent popup opening
    }
});
</script>

<input id="datepicker" />
<script>
$("#datepicker").kendoDatePicker();

var datepicker = $("#datepicker").data("kendoDatePicker");

datepicker.bind("open", function(e) {
    e.preventDefault(); //prevent popup opening
});
</script>