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In product detail page the following code is written to display the cross-sell product which are set from the admin side..
<?php echo $this->getChildHtml('crosssell'); ?>

But it is not showing anything although there are cross sell products present in the admin side and the cross-sell products are instock.

I looked into its respective block i.e.

app/core/code/Mage/Catalog/Block/Product/List/Crosssell.php

and the function where the product collection is formed is as follows..

protected function _prepareData()

{

    $product = Mage::registry('product');

    /* @var $product Mage_Catalog_Model_Product */



    $this->_itemCollection = $product->getCrossSellProductCollection()

        ->addAttributeToSelect(Mage::getSingleton('catalog/config')->getProductAttributes())

        ->setPositionOrder()

        ->addStoreFilter();





    Mage::getSingleton('catalog/product_visibility')->addVisibleInCatalogFilterToCollection($this->_itemCollection);



    $this->_itemCollection->load();



    foreach ($this->_itemCollection as $product) {

        $product->setDoNotUseCategoryId(true);

    }



    return $this;

}  

I got nothing related to cross sell product while doing var_dump($product).

This is product detail layout file i.e. catalog.xml

<catalog_product_view translate="label">

<label>Catalog Product View (Any)</label>

<!-- Mage_Catalog -->

<reference name="root">

    <action method="setTemplate"><template>page/2columns-left.phtml</template></action>

</reference>

<reference name="head">

    <action method="addJs"><script>varien/product.js</script></action>

    <action method="addJs"><script>varien/configurable.js</script></action>

    <action method="addItem"><type>js_css</type><name>calendar/calendar-win2k-1.css</name><params/></action>

    <action method="addItem"><type>js</type><name>calendar/calendar.js</name></action>

    <action method="addItem"><type>js</type><name>calendar/calendar-setup.js</name></action>

    <action method="addCss"><stylesheet>css/basket.css</stylesheet></action>

</reference>

<reference name="content">

    <block type="catalog/product_view" name="product.info" template="catalog/product/view.phtml">

        <block type="page/html_breadcrumbs" name="breadcrumbs" as="breadcrumbs"/>

        <block type="page/html_pager" name="product_review_list.toolbar" />

        <block type="core/template" name="product_review_list.count" template="review/product/view/count.phtml" />

        <block type="review/product_view_list" name="product.info.product_additional_data" as="product_reviews" template="review/product/view/list.phtml" />

        <block type="catalog/product_view" name="review_button" as="review_button" template="review/product/view/button.phtml"/>



        <block type="catalog/product_view" name="product.info.media" as="media" template="catalog/product/view/media.phtml"/>



        <block type="core/text_list" name="alert.urls" as="alert_urls" translate="label">

            <label>Alert Urls</label>

        </block>



        <action method="setTierPriceTemplate"><template>catalog/product/view/tierprices.phtml</template></action>



        <block type="catalog/product_list_upsell" name="product.info.upsell" as="upsell_products" template="catalog/product/list/upsell.phtml">

            <action method="setColumnCount"><columns>4</columns></action>

            <action method="setItemLimit"><type>upsell</type><limit>6</limit></action>

        </block>



        <block type="catalog/product_list_crosssell" name="product.info.crosssell" as="crosssell" template="catalog/product/list/crosssell.phtml"/>





        <block type="catalog/product_list_related" name="catalog.product.related" as="related" template="catalog/product/list/related.phtml"/>



        <block type="catalog/product_view_additional" name="product.info.additional" as="product_additional_data" />

        <block type="catalog/product_view_description" name="product.description" as="description" template="catalog/product/view/description.phtml">

            <action method="addToParentGroup"><group>detailed_info</group></action>

        </block>

        <block type="catalog/product_view_attributes" name="product.attributes" as="additional" template="catalog/product/view/attributes.phtml">

            <action method="addToParentGroup"><group>detailed_info</group></action>

        </block>

        <block type="catalog/product_view" name="product.info.addto" as="addto" template="catalog/product/view/addto.phtml"/>

        <block type="catalog/product_view" name="product.info.addtocart" as="addtocart" template="catalog/product/view/addtocart.phtml"/>



        <block type="core/text_list" name="product.info.extrahint" as="extrahint" translate="label">

            <label>Product View Extra Hint</label>

        </block>



        <block type="catalog/product_view" name="product.info.options.wrapper" as="product_options_wrapper" template="catalog/product/view/options/wrapper.phtml" translate="label">

            <label>Info Column Options Wrapper</label>

            <block type="core/template" name="options_js" template="catalog/product/view/options/js.phtml"/>

            <block type="catalog/product_view_options" name="product.info.options" as="product_options" template="catalog/product/view/options.phtml">

                <action method="addOptionRenderer"><type>text</type><block>catalog/product_view_options_type_text</block><template>catalog/product/view/options/type/text.phtml</template></action>

                <action method="addOptionRenderer"><type>file</type><block>catalog/product_view_options_type_file</block><template>catalog/product/view/options/type/file.phtml</template></action>

                <action method="addOptionRenderer"><type>select</type><block>catalog/product_view_options_type_select</block><template>catalog/product/view/options/type/select.phtml</template></action>

                <action method="addOptionRenderer"><type>date</type><block>catalog/product_view_options_type_date</block><template>catalog/product/view/options/type/date.phtml</template></action>

            </block>

                <block type="core/html_calendar" name="html_calendar" as="html_calendar" template="page/js/calendar.phtml"/>

        </block>

        <block type="catalog/product_view" name="product.info.options.wrapper.bottom" as="product_options_wrapper_bottom" template="catalog/product/view/options/wrapper/bottom.phtml" translate="label">

            <label>Bottom Block Options Wrapper</label>

            <action method="insert"><block>product.tierprices</block></action>

            <block type="catalog/product_view" name="product.clone_prices" as="prices" template="catalog/product/view/price_clone.phtml"/>

            <action method="append"><block>product.info.addtocart</block></action>

            <action method="append"><block>product.info.addto</block></action>

        </block>



        <block type="core/template_facade" name="product.info.container1" as="container1">

            <action method="setDataByKey"><key>alias_in_layout</key><value>container1</value></action>

            <action method="setDataByKeyFromRegistry"><key>options_container</key><key_in_registry>product</key_in_registry></action>

            <action method="append"><block>product.info.options.wrapper</block></action>

            <action method="append"><block>product.info.options.wrapper.bottom</block></action>

        </block>

        <block type="core/template_facade" name="product.info.container2" as="container2">

            <action method="setDataByKey"><key>alias_in_layout</key><value>container2</value></action>

            <action method="setDataByKeyFromRegistry"><key>options_container</key><key_in_registry>product</key_in_registry></action>

            <action method="append"><block>product.info.options.wrapper</block></action>

            <action method="append"><block>product.info.options.wrapper.bottom</block></action>

        </block>

        <action method="unsetCallChild"><child>container1</child><call>ifEquals</call><if>0</if><key>alias_in_layout</key><key>options_container</key></action>

        <action method="unsetCallChild"><child>container2</child><call>ifEquals</call><if>0</if><key>alias_in_layout</key><key>options_container</key></action>

    </block>

</reference>

So how to check if there is something missing by which the crossell products are not coming ?

Is there any other method of getting crossell products ?

Try this module:

File : appetcmodulesRkt_CrossSell.xml

<?xml version="1.0"?>

<config>

    <modules>

        <Rkt_CrossSell>

            <active>true</active>

            <codePool>community</codePool>

            <depends>

                <Mage_Catalog />

            </depends>

        </Rkt_CrossSell>

    </modules>

</config>

File : appcodecommunityRktCrossSelletcconfig.xml

<?xml version="1.0"?>

<config>

    <modules>

        <Rkt_CrossSell>

          <version>1.0.0</version>

        </Rkt_CrossSell>

    </modules>

    <global>

        <helpers>

            <rkt_crossell>

                <class>Rkt_CrossSell_Helper</class>

            </rkt_crossell>

        </helpers>

        <blocks>

            <rkt_crossell>

                <class>Rkt_CrossSell_Block</class>

            </rkt_crossell>

        </blocks>

    </global>

    <frontend>

        <layout>

            <updates>

                <rkt_crossell>

                    <file>rkt_crossell.xml</file>

                </rkt_crossell>

            </updates>

        </layout>

    </frontend>

</config>

File : appcodecommunityRktCrossSellBlockCatalogProductViewCrosssell.php

<?php

class Rkt_CrossSell_Block_Catalog_Product_View_Crosssell extends Mage_Checkout_Block_Cart_Crosssell

{



    /**

     * Get crosssell items

     *

     * @return array

     */

    public function getItems()

    {

        $items = $this->getData('items');

        if (is_null($items)) {

            $items = $this->getProduct()->getCrossSellProducts();

            $this->setData('items', $items);

        }

        return $items;

    }

}

File : appcodecommunityRktCrossSellHelperData.php

<?php

class Rkt_CrossSell_Helper_Data extends Mage_Core_Helper_Abstract

{



}

File : appdesignfrontendbasedefaultlayoutrkt_crossell.xml

<?xml version="1.0"?>

<layout>

    <catalog_product_view>

        <reference name="product.info">

            <block type="rkt_crossell/catalog_product_view_crosssell" name="product.view.crosssell" as="crosssell" template="checkout/cart/crosssell.phtml" />

        </reference>

    </catalog_product_view>

</layout>

Now in your view.phtml add this code in the appropriate position

<?php echo $this->getChildHtml('crosssell') ?> 

clear your cache and re-run product page.

Note: please check you have specify products cross sell for appropriate product.

I hope this will help you.

Have you set the cross sell products from admin?
If not then in admin panel Catalog > Manage Products > edit one product and under "Product Information > Cross-sells" section asign products as cross-sell.
After that do re-indexing and check.

if you want directly call cross-sell product then just paste below code in your view.phtml file and let me know its working or not

<?php echo $this->getLayout()->createBlock('catalog/product_list_crosssell')->setTemplate('catalog/product/list/crosssell.phtml')->toHtml() ?>

Just paste above code what ever place you want to display in view.phtml file

You have to add this block to your layout.xml:

<catalog_product_view translate="label">

    <reference name="content">

        <block type="catalog/product_view" name="product.info" template="catalog/product/view.phtml">

            <block type="checkout/cart_crosssell" name="checkout.cart.crosssell" as="crosssell" template="checkout/cart/crosssell.phtml"/>

     ...

Then you can render it in your template with this line:

<?php echo $this->getChildHtml('crosssell') ?>

There is also a faster way which works like this:

<?php 

    $_product = $this->getProduct();



    echo $this->getLayout()

    ->createBlock('checkout/cart_crosssell')

    ->setProduct($_product)

    ->setTemplate('checkout/cart/crosssell.phtml')

    ->toHtml();

?>

But this is dirty and fast.