Adding thumbnail images to the Magento admin product grid

Adding thumbnail images to the Magento admin product grid

This article describes how to insert images in the Magento admin product grid.
First of all, you will need to create your own extension. Let’s call it: Atwix_Gridthumbs.

Create a file /app/etc/modules/Atwix_Gridthumbs.xml with this content:

<?xml version="1.0"?>
<config>
    <modules>
        <Atwix_Gridthumbs>
            <active>true</active>
            <codePool>community</codePool>
        </Atwix_Gridthumbs>
    </modules>
</config>

Next step is the module’s config file. It should be located in /app/code/community/Atwix/Gridthumbs/etc/config.xml. The config file content will be like this:

<?xml version="1.0"?>
<config>
    <modules>
        <Atwix_Gridthumbs>
            <version>1.0</version>
        </Atwix_Gridthumbs>
    </modules>
    <global>
        <blocks>
            <adminhtml>
                <rewrite>
                    <catalog_product_grid>Atwix_Gridthumbs_Adminhtml_Block_Catalog_Product_Grid</catalog_product_grid>
                </rewrite>
            </adminhtml>
        </blocks>
    </global>
</config>

Now we need to override standard grid file. Create file /app/code/community/Atwix/Gridthumbs/Adminhtml/Block/Catalog/Product/Grid.php with the following content:

<?php 
class Atwix_Gridthumbs_Adminhtml_Block_Catalog_Product_Grid extends Mage_Adminhtml_Block_Catalog_Product_Grid
{
    protected function _prepareColumns()
    {
        $this->addColumn('image', array(
            'header' => Mage::helper('catalog')->__('Image'),
            'align' => 'left',
            'index' => 'image',
            'width'     => '70',
            'renderer' => 'Atwix_Gridthumbs_Block_Adminhtml_Template_Grid_Renderer_Image'
        )); 
        return parent::_prepareColumns();
    }
}

Here you can see line ‘renderer’ => ‘Atwix_Gridthumbs_Block_Adminhtml_Template_Grid_Renderer_Image’ . It says to use the custom renderer for image column. There’s no standard renderer for images, so we need to create it. Create the renderer file /app/code/community/Atwix/Gridthumbs/Block/Adminhtml/Template/Grid/Renderer/Image.php with source:

<?php 
class Atwix_Gridthumbs_Block_Adminhtml_Template_Grid_Renderer_Image extends Mage_Adminhtml_Block_Widget_Grid_Column_Renderer_Abstract
{
    public function render(Varien_Object $row)
    {
        return $this->_getValue($row);
    } 
    protected function _getValue(Varien_Object $row)
    {       
        $val = $row->getData($this->getColumn()->getIndex());
        $val = str_replace("no_selection", "", $val);
        $url = Mage::getBaseUrl('media') . 'catalog/product' . $val; 
        $out = "<img src=". $url ." width='60px'/>"; 
        return $out;
    }
}

Renderers return html or just plain text for the cell in the column. You can get the necessary values with the construction $row->getData($this->getColumn()->getIndex());
$this->getColumn()->getIndex(); returns the column index which was entered in addColumn in the previous step. If there is not an image associated with a product, image url will say “no_selection”, so we should remove this string for empty cells with construction $val = str_replace(“no_selection”, “”, $val);
That’s it! To be safe, as will all changes, you should flush cache and log out/log in to be sure you are seeing the new content. Now you can see available images in product grid. Happy coding!

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