Product Price Updated with Javascript Half Down in Magento 1.7

ce-1.7.0.2custom-optionsjavascriptpricetax

I have a strange problem. I have a product with the price 81.50, the tax is 19%, so the regular price is 96.985. In PHP I use rounding with half up. The price on product page is 96.99 which is corect, but when the page finishes loading the price is updated to 96.98. What could be the problem?

Is there a function JS which updates the rounded price on page?

Update 1

The problem is present only for products with custom options (ex: color), even if it has just one option and the price for it is 0.00.

Best Answer

I think you could use a hack for this. Edit in js/varien/products.js file the function formatPrice:

formatPrice: function(price) {
    price = (Math.round(price*100)/100);

    return formatCurrency(price, this.priceFormat);
}

Related Solutions

Magento 1.9 – Price Changes to Zero After Selecting an Option

The code posted in the accepted answer cannot be found in a default Magento install.

Thus I'm pretty sure the issue can be caused by the JavaScript method called reloadPrice.

Interestingly, when checking the block that renders the attribute dropdown you can find this:

if (!$this->getSkipJsReloadPrice()) {
    $extraParams .= ' onchange="opConfig.reloadPrice()"';
}

I'm pretty sure you can set that parameter via layout XML by doing this:

<catalog_product_view>
    <reference name="product.info.options">
        <action method="setData">
            <name>skip_js_reload_price</name>
            <value>true</value>
        </action>
    </referencen>
</catalog_product_view>

Magento – Make custom option price to be added to bundle product price in cart

In answer to your question of: 'where is the sum of custom option price and simple product price first time calculated or/and stored in quote item.'

Static Code Trace for the locations where it is added. With a plausible path for adding the item and calculating the price.

Actually Adding an Item to the Cart:

SEE Mage_Catalog_Model_Product_Type_Abstract::_prepareOptions
AND Mage_Catalog_Model_Product::prepareCustomOptions
AND Mage_Catalog_Model_Product::addCustomOption
Called By: Mage_Catalog_Model_Product_Type_Abstract::_prepareProduct
Called By: Mage_Catalog_Model_Product_Type_Abstract::prepareForCartAdvanced
Called By: Mage_Sales_Model_Quote::addProductAdvanced
Called By: Mage_Sales_Model_Quote::addProduct
Called By: Mage_Checkout_Model_Cart::addProduct
Called By: Mage_Checkout_CartController::addAction

Calculating the Price:

Mage_Catalog_Model_Product_Type_Price:_applyOptionsPrice
Called By: Mage_Catalog_Model_Product_Type_Price::getFinalPrice 

Further look at Mage_Catalog_Model_Product_Option_Group_Abstract::getOptionPrice
Called by Mage_Catalog_Model_Product_Option::groupFactory
Called by Mage_Catalog_Model_Product_Type_Price::_applyOptionsPrice

Update 1

Best Answer

Related Solutions

Magento 1.9 – Price Changes to Zero After Selecting an Option

Magento – Make custom option price to be added to bundle product price in cart

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