Disable underage to place any orders

-- url of the page with the problem -- : www.genusskanzlei.at/shop
-- HikaShop version -- : 2.3.0
-- Joomla version -- : 3.2.3
-- PHP version -- : 5.4.24
-- Browser(s) name and version -- : XXXXX x.x.x
-- Error-message(debug-mod must be tuned on) -- : none

For the table "address" I have added a "Custom Field" named: "Birth date", which is a requirement. The reason is that we need to unable person under 18 years to place any order on the shop, since we also offer alcoholic beverage.

How could achieved this?

Or should we just not allow anybody under 18 year to register at all? How?

I think this should help me get the age:

function birthday($birthday) {
    $age = date_create($birthday)->diff(date_create('today'))->y;
      return $age;
}
If $age < 18 {
echo  JText::_('You_must_be_18_to_order');
return „home“??
}

Hi!

I actually have the custom field of type datepicker. I don't see which is the "advanced restriction settings", but I gave unto "Default Value" a date and then set "Allow" to "Only past dates", as you can see in the picture. Then I've got next to date entry for "Default Value"

disableFunc: function(date) { var today=new Date(); 
today.setHours(23);today.setMinutes(59);today.setSeconds(59);today.setMilliseconds(99); if(date > today) { return true; } return false; }, // :

 0 DateTime::__construct(): Failed to parse time string (23.05.1996",disableFunc: function(date) { var today=new Date(); today.setHours(23);today.setMinutes(59);today.setSeconds(59);today.setMilliseconds(99); if(date > today) { return true; } return false; }, //) at position 10 (&): Unexpected character

Hi,

In all cases, you can't add javascript directly in the input field.
I'm not sure that this custom field handle the check for a minimum age. You will potentially have to create a plugin based on the function "onBeforeAddressCreate()", or "onBeforeAddressUpdate()" and make a check on the current date, the date set in the custom field to allow the registration or not.

So PHP knowledge are required.

I didn't add the javascript.
After I input the date In the field and clicked save, this script showed up and there was no way to remove it. You can try recreate what I explain and see for yourself.