How to create controller without creating menu in Adminhtml Magento 2

Question

I have referred below Article to display button in my Configuration page.

https://magecomp.com/blog/add-a-button-in-magento-2-stores-configuration-with-custom-action/

In file

app\code\Vendor\Extension\Block\System\Config\Button.php

there is a function where we can define our Ajax URL

public function getAjaxUrl()
    {
        return $this->getUrl(‘your action Url’);
    }

So for this, I want to create controller in Adminhtml which i can access using action url. but all the examples i found also creates menu in sidebar in addition to controller action.

For example this one: https://www.maximehuran.fr/en/admin-controller-creation-with-magento-2/

Is there any way to access controller action without creating menu?

Edit: After some modification to code, I can get into the controller using below URL:

my_backend_url/route_id/controller_name/index

but it redirects back me to Dashboard page.

As mentioned in this article:

Magento 2 Custom Admin Action Redirected to Dashboard

It's Secret Form Key issue.

We can get Secret form key only if we add controller to menu which i don't want to do!

Disabling Secret Form key is not what i prefer!

Answer 1

Answer which worked for me is from this article:

Magento 2 Custom Admin Action Redirected to Dashboard

We can use protected $_publicActions = ['ENTER_NAME_OF_ACTION']; to turn off form key validation for specific controller like below:

class Index extends \Magento\Backend\App\Action
{
    protected $_publicActions = ['index'];

    public function execute()
    {
        echo "My Hello World! Controller";
    }

}

It's better to disable form key for only my controller instead of everywhere in admin panel.

Please share if anyone has any better solution.

Answer 2

Your namespace should be uppercase, not lowercase, if you want to go step by step How do I create a controller in magento 2