Magento 1.9 – Solved: Adding Mass Delete Action to the Grid

You've done what you need to up to wiring in your controller.

First you need to declare a route for your controller(s) in the module config XML:

...
<admin>
    ...
    <routers>
        <masscustomstatusses>
            <use>admin</use>
            <args>
                <module>VivasIndustries_MassCustomStatusses</module>
                <frontName>masscustomstatusses</frontName>
            </args>
        </masscustomstatusses>
    </routers>
    ...
</admin>
...

Then build the controller:

<?php

class VivasIndustries_MassCustomStatusses_ControllerController
    extends Mage_Adminhtml_Controller_Action
{

    public function actionAction()
    {
        // Update status here
        // Can fetch selected items with $this->getRequest()->getParam()

        die('Looks like it works');
    }

}

I've used your naming convention exactly as you have described, though I doubt that's what you really want. Better to use standard Magento convention, with controller named IndexController and base action named indexAction. But you should get the idea.

Clear cache and try to run that mass action. The die statement should run, and fill in the blanks from there.

NOTE: I should point out that you're doing the same thing twice. You are both extending the sales order grid to add a mass action AND injecting it via event observer. As the article you reference points out, those are 2 different ways to do the same thing. You should choose one of those methods, only.

You have an error in your Observer class because Mage_Adminhtml_Block_Cms_Block_Grid should be Mage_Adminhtml_Block_Catalog_Product_Grid

However you are also right that there is a better event to use, you can use 'adminhtml_catalog_product_grid_prepare_massaction' so you can do the same code but without the instanceof check and that will do what you need.

That said... I obviously don't know why you want to do this but I imagine if I was doing it it's because I don't want person X to accidentally remove a bunch of products. And so you could go a little futher and remove this action on a user basis by adding it as a acl configuration and checking if that user is allowed in the observer as per below.

etc/adminhtml.xml

<?xml version="1.0"?>
<config>
    <acl>
        <resources>
            <admin>
                <children>
                    <catalog>
                        <children>
                            <products>
                                <children>
                                    <mass_delete>
                                        <title translate="title">Mass Delete</title>
                                        <sort_order>10</sort_order>
                                    </mass_delete>
                                </children>
                            </products>
                        </children>
                    </catalog>
                </children>
            </admin>
        </resources>
    </acl>
</config>

Model/Observer.php

<?php
class NameSpace_ModuleName_Model_Observer
{
    public function isAddProductDeletePermitted($observer) {
        if (!$this->_isAllowedAction('mass_delete')) {
            $block = $observer->getBlock();
            $block->getMassactionBlock()->removeItem('delete');
        }
        return $this;
    }

    protected function _isAllowedAction($action)
    {
        return Mage::getSingleton('admin/session')->isAllowed(
            'catalog/products/' . $action
        );
    }

}