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diff --git a/addons/website_sale_stock/static/src/js/variant_mixin.js b/addons/website_sale_stock/static/src/js/variant_mixin.js
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+++ b/addons/website_sale_stock/static/src/js/variant_mixin.js
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+odoo.define('website_sale_stock.VariantMixin', function (require) {
+'use strict';
+
+var VariantMixin = require('sale.VariantMixin');
+var publicWidget = require('web.public.widget');
+var ajax = require('web.ajax');
+var core = require('web.core');
+var QWeb = core.qweb;
+var xml_load = ajax.loadXML(
+    '/website_sale_stock/static/src/xml/website_sale_stock_product_availability.xml',
+    QWeb
+);
+
+/**
+ * Addition to the variant_mixin._onChangeCombination
+ *
+ * This will prevent the user from selecting a quantity that is not available in the
+ * stock for that product.
+ *
+ * It will also display various info/warning messages regarding the select product's stock.
+ *
+ * This behavior is only applied for the web shop (and not on the SO form)
+ * and only for the main product.
+ *
+ * @param {MouseEvent} ev
+ * @param {$.Element} $parent
+ * @param {Array} combination
+ */
+VariantMixin._onChangeCombinationStock = function (ev, $parent, combination) {
+    var product_id = 0;
+    // needed for list view of variants
+    if ($parent.find('input.product_id:checked').length) {
+        product_id = $parent.find('input.product_id:checked').val();
+    } else {
+        product_id = $parent.find('.product_id').val();
+    }
+    var isMainProduct = combination.product_id &&
+        ($parent.is('.js_main_product') || $parent.is('.main_product')) &&
+        combination.product_id === parseInt(product_id);
+
+    if (!this.isWebsite || !isMainProduct){
+        return;
+    }
+
+    var qty = $parent.find('input[name="add_qty"]').val();
+
+    $parent.find('#add_to_cart').removeClass('out_of_stock');
+    $parent.find('#buy_now').removeClass('out_of_stock');
+    if (combination.product_type === 'product' && _.contains(['always', 'threshold'], combination.inventory_availability)) {
+        combination.virtual_available -= parseInt(combination.cart_qty);
+        if (combination.virtual_available < 0) {
+            combination.virtual_available = 0;
+        }
+        // Handle case when manually write in input
+        if (qty > combination.virtual_available) {
+            var $input_add_qty = $parent.find('input[name="add_qty"]');
+            qty = combination.virtual_available || 1;
+            $input_add_qty.val(qty);
+        }
+        if (qty > combination.virtual_available
+            || combination.virtual_available < 1 || qty < 1) {
+            $parent.find('#add_to_cart').addClass('disabled out_of_stock');
+            $parent.find('#buy_now').addClass('disabled out_of_stock');
+        }
+    }
+
+    xml_load.then(function () {
+        $('.oe_website_sale')
+            .find('.availability_message_' + combination.product_template)
+            .remove();
+
+        var $message = $(QWeb.render(
+            'website_sale_stock.product_availability',
+            combination
+        ));
+        $('div.availability_messages').html($message);
+    });
+};
+
+publicWidget.registry.WebsiteSale.include({
+    /**
+     * Adds the stock checking to the regular _onChangeCombination method
+     * @override
+     */
+    _onChangeCombination: function (){
+        this._super.apply(this, arguments);
+        VariantMixin._onChangeCombinationStock.apply(this, arguments);
+    }
+});
+
+return VariantMixin;
+
+});