Magento, different background color for group of rows on backend grid

Question

On a backend admin page with a grid I need to change the background color for groups of rows. Not alternate color row by row as default but coloring groups according to a kn

Answer 1

For anyone looking for a solution. I used this tutorial on the Inchoo website: Add custom renderer for a custom column in Magento grid. There are some SO questions that also helped to understand the solution.

I didn't manage to change the full row background color as initially wanted, I'm just modifying the cell background. But at the end, is enough to point the user that this row is somewhat different. What I have done was add a new custom column. On the renderer property I referenced a new class.

$this->addColumn('collision_type', array(
          'header'  => $helper->__('Collision'),
          'align'   => 'center',
          'index'   => 'collision_type',
          'type'    => 'action',
          'renderer'=> new Dts_Banners_Block_Adminhtml_Collisions_Grid_Renderer_Collisiontype(),
));

I placed the needed class inside a new subtree:

Grid
  └─ Renderer
        └─ Collisiontype.php

And this is the new class that should render the column. To have different colors just need to evaluate the $value variable and apply different color styles for the corresponding value, that is what I'm doing now.

<?php
class Dts_Banners_Block_Adminhtml_Collisions_Grid_Renderer_Collisiontype extends Mage_Adminhtml_Block_Widget_Grid_Column_Renderer_Abstract
{
    public function render(Varien_Object $row) {
        $value =  $row->getData($this->getColumn()->getIndex());
        return '<div style="color:#FFF;font-weight:bold;background:#F55804;border-radius:8px;width:100%">'.$value.'</div>';
    }
}
?>

And the result:

Answer 2

The answers above are good, but sometimes you want to do the same thing without creating a new file.
Here is another way to achieve the same result remaining in the grid file.

$this->addColumn('collision_type', array(
      'header'  => $helper->__('Collision'),
      'align'   => 'center',
      'index'   => 'collision_type',
      'type'    => 'action',
      'frame_callback' => [$this, '_formatCell']
));

then in the same file

public function _formatCell($value, Varien_Object $row, Mage_Adminhtml_Block_Widget_Grid_Column $column)
{
    $value =  $row->getData($column->getIndex());
    return '<div style="color:#FFF;font-weight:bold;background:#F55804;border-radius:8px;width:100%">'.$value.'</div>';
}

Answer 3

In my case i used above code snippet. I had need to create a custom radio column in grid for category. So i placed all conditions to this like this.

public function render(Varien_Object $row) {
        $category = Mage::registry('current_category');
        $screenId = $category->getCategoryAttachedID();
        if($row->getId()==$screenId)$checked='checked="checked"';
        else $checked='';
        return '<input type="radio" name="screen_id" value="'.$row->getId().'" '.$checked.' >';
    }