Custom field date pickers allow dates problem

-- HikaShop version -- : 4.0.2
-- Joomla version -- : 3.9.3
-- PHP version -- : 7.2.14
-- Browser(s) name and version -- : FireFox 65.0.1

Hi,

During checkout there must be a choice for promotional material. So I configured a radio (table order) for no (standard, value 0) or yes (value 1). Based on this choice 2 (advanced) datepickers (also in table order) appear (from which date and till which date). De first datepicker should only allow future days, the second datepicker should only allow dates starting datepicker 1 till 7 days later.

I'm no coder but, with Jquery, I have the datepickers working. There is only 1 problem: The first datepickers input is not saved to the database. When choosing Hikashop -> Orders the Radio and datepicker colluns are visible but the first datepicker shows blank, even if a date is entered during checkout.

My jQuery code:

jQuery(document).ready(function($) { 
	var $div1 = $('#hikashop_order_1_7_promotiebanner_van');
	var $div2 = $('#hikashop_order_1_7_promotiebanner_tot');
	$div1.hide();
	$div2.hide();

	$('input:radio[name="checkout[fields][promotiebanner]"]').change(function() {
	    if (this.checked) {
	        if (this.value == '1') {
	            $div1.show();
	            $div2.show();
	        } else {
	            $div1.hide();
	            $div2.hide();
	            $('#promotiebanner_van_input').val('');
		    $('#promotiebanner_tot_input').val('');
	        }
    }
});
	$("#promotiebanner_van_input").datepicker({
        minDate: 0,
    	onSelect: function() { 
        var begin = $(this).datepicker('getDate');
        var eind = $(this).datepicker('getDate');
        eind.setDate(eind.getDate() + 7);
        begin.setDate(begin.getDate() + 2);
        $('#promotiebanner_tot_input').datepicker('option', 'minDate', begin);
        $('#promotiebanner_tot_input').datepicker('option', 'maxDate', eind);
    }
});
});

Hi Nicolas,

It's a B2B site (in development) so you need credentials to logon (guests only see a catalog).
You can logon (menu-item aanmelden) with

Hi Nicolas,

Thank you for your comment, I'll try to figure out to update the input in the hidden input.

Regards,
Eric