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Travel Pack
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jQuery(document).ready(function($) { var productIDs = [239, 263]; // Replace with your product IDs. var productId = parseInt($('input[name="add-to-cart"]').val()); if (productIDs.includes(productId)) { var quantityInput = $('input.qty'); var minValue = 2; quantityInput.val(minValue); quantityInput.on('change', function() { var currentValue = parseInt($(this).val()); if (currentValue % 2 !== 0) { currentValue = minValue + Math.floor((currentValue - minValue) / 2) * 2; $(this).val(currentValue); } }); $('form.cart').on('submit', function(e) { var currentValue = parseInt(quantityInput.val()); if (currentValue % 2 !== 0 || currentValue < minValue) { e.preventDefault(); alert('Please select a quantity in multiples of 2 starting from 2.'); } }); } });

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