====== Troubleshooting Magestore - Ajax Cart ======

When enabling Ajax Cart a conflict with LiteMage can cause a blank page to be served. The following is a step-by-step example for troubleshooting this issue.

  - Turn on the debug log.
  - In your browser open a page from your site. You should get a blank page at this point.
  - In ''var/log/system.log'', you will see errors like: <code>
2016-04-04T14:12:24+00:00 ERR (3): Warning: simplexml_load_string(): &lt;!--Litemage esi started cart_sidebar--&gt;&lt;/!--Litemage&gt;  in /home/user/public_html/app/code/local/Magestore/Ajaxcart/Helper/Data.php on line 29
</code>These errors are caused by the following code block in ''Magestore/Ajaxcart/Helper/Data.php'':<code>
    /**
     * get Mini cart block class
     *
     * @return string
     */
    public function getMiniCartClass() {
        if (!isset($this->_cache['mini_cart_class'])) {
            $minicartSelect = '';
            if ($minicartBlock = Mage::app()->getLayout()->getBlock('cart_sidebar')) {
                $xmlMinicart = simplexml_load_string($this->toXMLElement($minicartBlock->toHtml()));
                $attributes = $xmlMinicart->attributes();
                if ($id = (string)$attributes->id) {
                    $minicartSelect = "#$id";
                } elseif ($class = (string)$attributes->class) {
                    $minicartSelect = '[class="' . $class . '"]';
                }
            }
            $this->_cache['mini_cart_class'] = $minicartSelect;
        }
        return $this->_cache['mini_cart_class'];
    }
</code>Looking more closely at the ''getMiniCartClass()'' function we see:<code>
 $xmlMinicart = simplexml_load_string($this->toXMLElement($minicartBlock->toHtml()));
                $attributes = $xmlMinicart->attributes();
</code>At this point in the code, the value of ''$minicartBlock'' is already a hole-punched ESI block, so the function ''toHtml()'' will return something like ''<esi:include ...>'' which will not be understood by the ''toXMLElement()'' function.
  - From your browser, append ''?LITEMAGE_DEBUG=NOCACHE'' to the current URL so you can see the original page without LiteMage.\\ \\ Check the HTML source window by right clicking on the page and selecting something like **View Page Source**. Leave this window open.\\ \\ Now modify the previously mentioned ''getMiniCartClass()'' function in ''Magestore/Ajaxcart/Helper/Data.php'', replacing <code>$this->_cache['mini_cart_class'] = $minicartSelect;</code> with code containing a marker like <code> $this->_cache['mini_cart_class'] = 'LMDD_' .$minicartSelect . '_LMDD';</code> Open another browser window and view the same URL as before. Once again look at the source code for this page but this time search for our marker ''LMDD_''.\\ \\ You should find something like <code>LMDD_[class="login_scroll"]_LMDD</code>Check a few more URLs with ''?LITEMAGE_DEBUG=NOCACHE'' to confirm that you always get this same string.\\ \\ Now we can go back and modify the ''getMiniCartClass()'' function again, this time commenting out the original logic and putting in the value directly. <code>public function getMiniCartClass() {
        if (!isset($this->_cache['mini_cart_class'])) {
         /*   $minicartSelect = ''; // this will not work with LiteMage
            if ($minicartBlock = Mage::app()->getLayout()->getBlock('cart_sidebar')) {
                $xmlMinicart = simplexml_load_string($this->toXMLElement($minicartBlock->toHtml()));
                $attributes = $xmlMinicart->attributes();
                if ($id = (string)$attributes->id) {
                    $minicartSelect = "#$id";
                } elseif ($class = (string)$attributes->class) {
                    $minicartSelect = '[class="' . $class . '"]';
                }
            } */
                $minicartSelect = '[class="login_scroll"]';
            $this->_cache['mini_cart_class'] = $minicartSelect;
        }
        return $this->_cache['mini_cart_class'];
    }
</code>
  - Now from your browser, view the original URL without ''?LITEMAGE_DEBUG=NOCACHE''. The page should now be displaying correctly.
  - Perform any final testing and disable the debug log when done.
**Note:** Enabling mini compare will cause a similar problem and break ESI. You can fix this by following the same steps as above to modify ''public function getMiniCompareClass()''.