Programmatically: How to create custom Magento admin grids

Step 1: Create a new module with etc/module.xml file

Create a new directory MyCompany/MyModule and add the following etc/module.xml file:

		
	
    
        
            1.0.0
        
    
	
	

Step 2: Define the grid in etc/adminhtml/grid.xml file

Create a new directory app/code/local/MyCompany/MyModule/etc/adminhtml and add the following grid.xml file:

		
	
    
        
            
                My Custom Grid
                
                    MyCompany_MyModule::grid/my_custom_grid
                
            
        
    
	
	

Step 3: Create a new PHP class that extends Mage_Adminhtml_Block_Widget_Grid and overrides the prepareCollection() and addMassaction() methods

Create a new directory app/code/local/MyCompany/MyModule/Block/Adminhtml and add the following PHP class:

	class MyCompany_MyModule_Block_Adminhtml_Grid_MyCustomGrid extends Mage_Adminhtml_Block_Widget_Grid
  {
    public function __construct()
    {
        parent::__construct();
        $this->setId('my_custom_grid');
        $this->setDefaultSort('id');
        $this->setDefaultDir('ASC');
        $this->setSaveParametersInSession(true);
    }

    protected function _prepareCollection()
    {
        $collection = Mage::getModel('mycompany_mymodule/my_model')->getCollection();
        $this->setCollection($collection);
        return parent::_prepareCollection();
    }

    protected function _addMassaction()
    {
        if (!Mage::app()->isSingleStoreMode()) {
            $this->getMassactionBlock()->addItem('delete', array(
                'label' => Mage::helper('adminhtml')->__('Delete'),
                'url' => $this->getUrl('*/*/massDelete'),
                'confirm' => array(
                    'title' => Mage::helper('adminhtml')->__('Delete Items'),
                    'message' => Mage::helper('adminhtml')->__('Are you sure you want to delete these items?')
                )
            ));
        }
        return parent::_addMassaction();
    }
    }
	

Step 4: Register the grid in etc/adminhtml/routes.xml file

Create a new directory app/code/local/MyCompany/MyModule/etc/adminhtml and add the following routes.xml file:

		
	
    
        
            
                 
                    Mymodule
                
            
        
        
            
                 
                    
                     
                        MyCompany_MyModule
                        mymodule