Mryntu

I have problem when I want to put JS into head when PHP condition is met, but I'm getting Mage_Core_Exception: Invalid block type excetion no idea why. I have read all the possible issues I have found but looks like there is ton of places I could go wrong and right now Im out of ideas.

I have config.xml where is my module declared. This is only part of it as rest of module is working, also JS and CSS I have in module_name.xml is working properly.

</frontend>
 <layout>
 <updates>
 <module_name>
 <file>module_name.xml</file>
 </module_name>
 </updates>
 </layout>
</frontend>

Then I have module_name.xml I understand that I say here "on checkout/cart page load this template/modulename/prependca.phtml into of page.

<checkout_cart_index translate="label">
 <reference name="head">
 <block type="namespace_moduleName/cart" name="prependca" template="modulename/prependca.phtml"/>
 </reference>
</checkout_cart_index>

Last, but not least, I have this Class of mine:

class Namespace_ModuleName_Block_Cart extends Mage_Checkout_Block_Cart_Abstract 

 public function prependCa() 
 $_quote = Mage::getSingleton('checkout/session')->getQuote();
 if (get_class($_quote) == Mage_Sales_Model_Quote) 
 $head = $this->getLayout()->getBlock('head');
 $head->addJs('namespace/modulenameTotals.js');
 $head->addItem('js', 'namespace/modulenameTotals.js');
 
 

From what I have read, I did all I had to do, however I still don't get results and only respond I get is Mage_Core_Exception: Invalid block type

1. 
   

   Go to app/design/frontend/package/theme/layout/local.xml then add this :

   
   
   

   <checkout_cart_index>
    <reference name="head">
    <action method="addItem"><type>skin_js</type><name>js/my-custom.js</name></action>
    </reference>
   </checkout_cart_index>
   

   
   



2. Create your new js file in: skin/frontend/package/theme/js/my-custom.js then put your code inside.




3. Now your js file will be just loaded in checkout/cart. Don't forget to clear the cache.

NB: I see some errors in your code:

1)

<frontend> // not </frontend>
 <layout>
 <updates>
 <module_name>
 <file>module_name.xml</file>
 </module_name>
 </updates>
 </layout>
</frontend>

2)

You can't load this type of block in a head ! but you can do it content, root etc...

If you need is to add a js file, follow my solution.