Kdjykuj

Im trying to retrieve the Current Product ID inside the Tax-model-Calculation.php (code in -> https://github.com/adam-paterson/magento-ce-1.9.0.1/blob/master/app/code/core/Mage/Tax/Model/Calculation.php )

public function calcTaxAmount($price, $taxRate, $priceIncludeTax = false, $round = true)

    {

        $taxRate = $taxRate / 100;

        if ($priceIncludeTax) {

            $amount = $price * (1 - 1 / (1 + $taxRate));

        } else {

            $amount = $price * $taxRate;

        }

        if ($round) {

            return $this->round($amount);

        }

        return $amount;

    }

I tried the following code:

public function calcTaxAmount($price, $taxRate, $priceIncludeTax=false, $round=true)

{

    $taxRate = $taxRate/100;

    $product = Mage::registry('current_product')->getId();

    var_dump($product);

but the following information is displayed in frontpage when I debug using var_dump($product):

Fatal error: Uncaught Error: Call to a member function getId() on null

Additionally I tried $product = $this->getProduct()->getId();

with same result.

Follow bellow steps:

Step : 1 First copy core file from app/code/core/Mage/Tax/Helper/Data.php to local app/code/local/Mage/Tax/Helper/Data.php or override helper data

After replace bellow functions

public function getPrice($product, $price, $includingTax = null, $shippingAddress = null, $billingAddress = null,

                         $ctc = null, $store = null, $priceIncludesTax = null, $roundPrice = true)

{

    if (!$price) {

        return $price;

    }

    $store = $this->_app->getStore($store);

    if (!$this->needPriceConversion($store)) {

        return $store->roundPrice($price);

    }

    if (is_null($priceIncludesTax)) {

        $priceIncludesTax = $this->priceIncludesTax($store);

    }



    $percent = $product->getTaxPercent();

    $includingPercent = null;



    $taxClassId = $product->getTaxClassId();

    if (is_null($percent)) {

        if ($taxClassId) {

            $request = Mage::getSingleton('tax/calculation')

                ->getRateRequest($shippingAddress, $billingAddress, $ctc, $store);

            $percent = Mage::getSingleton('tax/calculation')

                ->getRate($request->setProductClassId($taxClassId));

        }

    }

    if ($taxClassId && $priceIncludesTax) {

        if ($this->isCrossBorderTradeEnabled($store)) {

            $includingPercent = $percent;

        } else {

            $request = Mage::getSingleton('tax/calculation')->getRateOriginRequest($store);

            $includingPercent = Mage::getSingleton('tax/calculation')

                ->getRate($request->setProductClassId($taxClassId));

        }

    }



    if ($percent === false || is_null($percent)) {

        if ($priceIncludesTax && !$includingPercent) {

            return $price;

        }

    }



    $product->setTaxPercent($percent);

    if ($product->getAppliedRates() == null) {

        $request = Mage::getSingleton('tax/calculation')

                ->getRateRequest($shippingAddress, $billingAddress, $ctc, $store);

        $request->setProductClassId($taxClassId);

        $appliedRates =  Mage::getSingleton('tax/calculation')->getAppliedRates($request);

        $product->setAppliedRates($appliedRates);

    }



    if (!is_null($includingTax)) {

        if ($priceIncludesTax) {

            if ($includingTax) {

                /**

                 * Recalculate price include tax in case of different rates.  Otherwise price remains the same.

                 */

                if ($includingPercent != $percent) {

                    // determine the customer's price that includes tax

                    $price = $this->_calculatePriceInclTax($price, $includingPercent, $percent, $store, $product);

                }

            } else {

                $price = $this->_calculatePrice($price, $includingPercent, false, false, $product);

            }

        } else {

            if ($includingTax) {

                $appliedRates = $product->getAppliedRates();

                if (count($appliedRates) > 1) {

                    $price = $this->_calculatePriceInclTaxWithMultipleRates($price, $appliedRates);

                } else {

                    $price = $this->_calculatePrice($price, $percent, true, false, $product);

                }

            }

        }

    } else {

        if ($priceIncludesTax) {

            switch ($this->getPriceDisplayType($store)) {

                case Mage_Tax_Model_Config::DISPLAY_TYPE_EXCLUDING_TAX:

                case Mage_Tax_Model_Config::DISPLAY_TYPE_BOTH:

                    if ($includingPercent != $percent) {

                        // determine the customer's price that includes tax

                        $taxablePrice = $this->_calculatePriceInclTax($price, $includingPercent, $percent, $store, $product);

                        // determine the customer's tax amount,

                        // round tax unless $roundPrice is set explicitly to false

                        $tax = $this->getCalculator()->calcTaxAmount($taxablePrice, $percent, true, $roundPrice, $product);

                        // determine the customer's price without taxes

                        $price = $taxablePrice - $tax;

                    } else {

                        //round tax first unless $roundPrice is set to false explicitly

                        $price = $this->_calculatePrice($price, $includingPercent, false, $roundPrice, $product);

                    }

                    break;



                case Mage_Tax_Model_Config::DISPLAY_TYPE_INCLUDING_TAX:

                    $price = $this->_calculatePrice($price, $includingPercent, false, false, $product);

                    $price = $this->_calculatePrice($price, $percent, true, false, $product);

                    break;

            }

        } else {

            switch ($this->getPriceDisplayType($store)) {

                case Mage_Tax_Model_Config::DISPLAY_TYPE_INCLUDING_TAX:

                    $appliedRates = $product->getAppliedRates();

                    if (count($appliedRates) > 1) {

                        $price = $this->_calculatePriceInclTaxWithMultipleRates($price, $appliedRates);

                    } else {

                        $price = $this->_calculatePrice($price, $percent, true, false, product);

                    }

                    break;



                case Mage_Tax_Model_Config::DISPLAY_TYPE_BOTH:

                case Mage_Tax_Model_Config::DISPLAY_TYPE_EXCLUDING_TAX:

                    break;

            }

        }

    }

    if ($roundPrice) {

        return $store->roundPrice($price);

    } else {

        return $price;

    }

}

''

protected function _calculatePriceInclTax($storePriceInclTax, $storePercent, $customerPercent, $store, $product=false)

{

    $priceExclTax         = $this->_calculatePrice($storePriceInclTax, $storePercent, false, false);

    $customerTax          = $this->getCalculator()->calcTaxAmount($priceExclTax, $customerPercent, false, false, $product);

    $customerPriceInclTax = $store->roundPrice($priceExclTax + $customerTax);

    return $customerPriceInclTax;

}

''

protected function _calculatePrice($price, $percent, $type, $roundTaxFirst = false, $product = false)

{

    $calculator = $this->getCalculator();

    if ($type) {

        $taxAmount = $calculator->calcTaxAmount($price, $percent, false, $roundTaxFirst, $product);

        return $price + $taxAmount;

    } else {

        $taxAmount = $calculator->calcTaxAmount($price, $percent, true, $roundTaxFirst, $product);

        return $price - $taxAmount;

    }

}

Step : 2 After copy core file from app/code/core/Mage/Tax/Model/Calculation.php to local app/code/local/Mage/Tax/Model/Calculation.php or override model file Calculation.php

and replace code from :

public function calcTaxAmount($price, $taxRate, $priceIncludeTax = false, $round = true)

{

    $taxRate = $taxRate / 100;



    if ($priceIncludeTax) {

        $amount = $price * (1 - 1 / (1 + $taxRate));

    } else {

        $amount = $price * $taxRate;

    }



    if ($round) {

        return $this->round($amount);

    }



    return $amount;

}

to

public function calcTaxAmount($price, $taxRate, $priceIncludeTax = false, $round = true, $product = false)

{

    if($product) {

    echo $product->getId();

    }



    $taxRate = $taxRate / 100;



    if ($priceIncludeTax) {

        $amount = $price * (1 - 1 / (1 + $taxRate));

    } else {

        $amount = $price * $taxRate;

    }



    if ($round) {

        return $this->round($amount);

    }



    return $amount;

}

Try to get it using Request object:

$productId = Mage::app()->getRequest()->getParam('product')

Which gives you requested product id inside calcTaxAmount method.

Hope this will work for you.

You can use below method to get current register product id.

1. 
   

   Just create a session to set the product id.You need to put below mentioned code in you header.phtml file.

   
   
   

   
   

   $productId = Mage::registry('current_product')->getId();
   Mage::getSingleton('core/session')->setCurrentProductId($productId);

   
   

   
   



2. Now you can get recently created session any where in Magento by using below code.

Mage::getSingleton('core/session')->getCurrentProductId()

Hope it will help you. For more see Alan's answer here.

Get a current product id in magento 1 by using below lines.

$product = Mage::registry('current_product');

$id = $product->getId();