Hi everyone,

I am trying to implement custom PLU barcode parsing in Odoo 18 POS using JavaScript patching, but it is not working.

My goal:

• Barcode format: 0PPPPWWWWW

• First 5 digits → product barcode

• Last 5 digits → weight in grams

my code:

{
    'name': 'POS PLU Barcode Parser',
    'version': '18.0.1.0.0',
    'category': 'Point of Sale',
    'summary': 'Adds support for parsing weight from PLU barcodes in the Point of Sale.',
    'depends': ['point_of_sale'],
    'assets': {
        'point_of_sale._assets_pos': [
            'zl_product_plu_barcode/static/src/js/plu_barcode_parser.js',
        ],
    },
    'installable': True,
    'auto_install': False,
    'license': 'LGPL-3',
}

/** @odoo-module **/

import { patch } from "@web/core/utils/patch";
import { ProductScreen } from "@point_of_sale/app/screens/product_screen/product_screen";
import { _t } from "@web/core/l10n/translation";

patch(ProductScreen.prototype, {
    /**
     * This is the correct function to override for Odoo 18.
     * The useBarcodeReader hook in ProductScreen directs product-related scans to this method.
     */
     
    async _barcodeProductAction(code) {
        const barcode = code.code;

        // Our custom logic for weight-embedded barcodes
        if (barcode && barcode.length === 10 && barcode.startsWith('0') && /^\d+$/.test(barcode)) {
            const product_barcode = barcode.substring(0, 5).replace(/^0+/, '');
            const weight = parseFloat(barcode.substring(5)) / 1000.0;

            // Create a mock code object for the product search
            const productCode = { code: product_barcode, type: 'product' };
            const product = await this._getProductByBarcode(productCode);

            if (product) {
                // Product found. Call the same function as the original method,
                // but inject our custom quantity into the options object.
                await this.pos.addLineToCurrentOrder(
                    { product_id: product },
                    { code, quantity: weight }, // Pass original code and new quantity
                    product.needToConfigure()
                );
                this.numberBuffer.reset(); // Reset buffer like the original function
                return; // Stop further processing
            } else {
                // Product not found, show a notification.
                this.pos.env.services.notification.add(
                    _t("Product with barcode '%s' not found.", product_barcode),
                    { type: 'danger' }
                );
                return;
            }
        }

        // If it's not our custom weight barcode, fall back to the original Odoo method.
        return await super._barcodeProductAction(code);
    }
});

The module installs successfully, but barcode scanning does not trigger my custom logic.

Any help would be greatly appreciated.

Thank you.