jQuery UI Custom Datepicker for Gravity Forms

// Date Format
var initDatePicker = function () {
    $( "#input_2_5" ).datepicker({
        minDate:    1,
        maxDate:    "+1m",
        dateFormat: "DD, d MM, yy"
    });

    $("#input_2_5").keypress(function (e) {
        // PreventDefault workaround for older browsers
        if (!e.preventDefault) {
            e.returnValue = false;
        } else {
            e.preventDefault();
        }
    });

    $("#input_2_5").keydown(function(e){
        //If delete or backspace pressed
        if (e.keyCode == 46 || e.keyCode == 8) {
            $(this).val(''); // Clear text
            $(this).datepicker("hide"); // Hide the datepicker calendar (if displayed)
            $(this).blur(); // Unfocus from the field
        }

        //Prevent user from manually entering date (have to use the datepicker box)
        // PreventDefault workaround for older browsers
        if (!e.preventDefault) {
            e.returnValue = false;
        } else {
            e.preventDefault();
        }
    });
};