https://cdn.sexopolis.gr/catalog/view/theme/journal3/js/stepper.js?v=dbc52b11

1(function ($) {
2	Journal['stepperDecimals'] = +Journal['stepperDecimals'] || 0;
3
4	function stepper(el) {
5		const $this = $(el);
6
7		const $input = $this.find('input[name^="quantity"]');
8		const minimum = parseFloat($input.data('minimum')) || 1;
9
10		function change(value, delta) {
11			value = value || 0;
12			delta = delta || 0;
13
14			if (!Journal['stepperDecimals']) {
15				delta = 1;
16			}
17
18			const val = Math.max((+$input.val() || 0) + value * delta, minimum);
19
20			$input.val(val.toFixed(Journal['stepperDecimals']));
21
22			$input.trigger('change');
23		}
24
25		$this.find('.fa-angle-up').on('click', function (e) {
26			change(1, e.shiftKey ? 0.1 : 1);
27		});
28
29		$this.find('.fa-angle-down').on('click', function (e) {
30			change(-1, e.shiftKey ? 0.1 : 1);
31		});
32
33		$input.on('keydown', function (e) {
34			switch (e.key) {
35				case 'ArrowUp':
36					e.preventDefault();
37
38					change(1, e.shiftKey ? 0.1 : 1);
39					break;
40
41				case 'ArrowDown':
42					e.preventDefault();
43
44					change(-1, e.shiftKey ? 0.1 : 1);
45					break;
46			}
47		});
48
49		$input.on('blur', function () {
50			change();
51		});
52	}
53
54	if (Journal['stepperStatus']) {
55		Journal.lazy('stepper', '.stepper', {
56			load: function (el) {
57				stepper(el);
58			}
59		});
60	}
61})(jQuery);