magento 1.9 checkout/onepage back cart empty

Question

I need to cart empty when user back from checkout/onepage.

If it is possible please help me in this.

Or this is my plan

I have creating a checkout/onepage like this

Here i want to prevent back url in browser & when user click logo here link cart will empty

Answer 1

Add this to <a> tags href

<?php echo Mage::getBaseUrl('your_module/your_controller/emptyCart');?>

Then in your controller add

 public function emptyCartAction()
 {
    Mage::getSingleton('checkout/cart')->truncate();
    Mage::getSingleton('checkout/cart')->save();
    $this->_redirect('*/*/');
    return;
 }

Answer 2

What you can do is set session variable on checkout page(using observer or override controller) using below code

$request = $this->getRequest();
$module = $request->getModuleName();
$controller = $request->getControllerName();
$action = $request->getActionName();
if($module == 'checkout' && $controller == 'onepage' && $action == 'index')
{
   Mage::getSingleton('core/session')->setWasOnCheckout(true);
}
else
{
   if(Mage::getSingleton('core/session')->getWasOnCheckout())
   {
     Mage::getSingleton('checkout/cart')->truncate();
     Mage::getSingleton('checkout/cart')->save();
     Mage::getSingleton('core/session')->setWasOnCheckout(false)
   }
}

you can use below link to learn how to use this code with observer http://inchoo.net/magento/dispatching-before-and-after-events-to-magento-core-actions/

Answer 3

You can use Magento's event and observer functionality to accomplish what you want.

• Observe controller_action_layout_load_before event and call an observer function on this event.
• In the observer's function, check the last URL by using below code:

$url = Mage::app()->getRequest()->getServer('HTTP_REFERER');

• Now match, if it is checkout onepage URL, then use below code to empty the cart:

  Mage::getSingleton('checkout/cart')->truncate(); Mage::getSingleton('checkout/cart')->save(); return;

This method will help you even when you don't want to add a link to empty the cart.

Please let me know if it worked.