My proceed to checkout button is missing, what steps can I take to diagnose?

When I am in the shopping cart "proceed to checkout" button is missing and I can't go any further in the checkout process. I looked at cart.phtml and $methodHtml is empty so the comparison (if ($methodHtml = $this->getMethodHtml($method)))to find checkout methods never shows the button.

I am wondering if anyone migh开发者_StackOverflow中文版t know how I can track down what might be wrong with Magento. Onestepcheckout is installed but even when disabled it makes no difference.

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Learn how to debug through the code using an IDE. Refer to this answer.

Once you have the debugging setup working for you, set breakpoints in Mage_Checkout_Block_Onepage_Link in the isDisabled() and isPossibleOnepageCheckout() methods so that you can trace through what is causing the button to be hidden.

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Need more information, but you if this is an overriden module then I think I can help.

I had this recently, you need to make to make sure the form controls are rewritten in the new module as well.

For instance, in config.xml....

    <blocks>
        <adminhtml>
            <rewrite><!-- required to add the form controls -->
        <checkout_onepage>CHRIS_Checkout_Block_Onepage</checkout_onepage>
            </rewrite>


        </adminhtml>
    </blocks>

Set up debugging is a pain but a pleasure when you start to see what is being called and from where.