How can I get Customer Group Id on Orders View Page?

Question

I am unable to get the correct Customer Group ID from the Order View page. This is part of a helper, which calls

Mage::getSingleton('adminhtml/sales_order_create')->getQuote()->getCustomerGroupId();

and it works fine if it is during the "Create Order" process, but I can't determine how to load the Customer Group on the Order View page after order creation.

What can I load to get the customer's group id from the order after the order is already created?

Answer 1

As already order create that why you can not use session quote object

Mage::getSingleton('adminhtml/sales_order_create')->getQuote()->getCustomerGroupId();

use Mage::registry('sales_order')

Try this

if(Mage::registry('sales_order') &&(Mage::registry('sales_order')->getId())):
Mage::registry('sales_order')->getCustomerGroupId();
else:
//During creation of an  order
Mage::getSingleton('adminhtml/sales_order_create')->getQuote()->getCustomerGroupId();
endif;