Add a block class programmically in drupal 8

Small snippet to show how to add a class to your block

How to add javascript to custom form in drupal 8

The way of handling javascript and css is different from drupal 7. This snippet shows how to do it.

Allow adding roles but disallow administrator role on the user registration form [drupal 8]

When you give users the permission to administer users, there is a security implication in that users with this permission can add the role 'administrator' role to any user.

Control block access programmatically in drupal 8

Block access is a powerful way to show or hide content in some contexts. Instead of using contrib modules, this is very easy in small pieces of custom code. The following code prevents access to a block based on a subscription field in the user object.

How to create a settings form to edit and save custom configuration in drupal 8

The following code shows how to create a custom form in the drupal back-end and how to save custom config defined in your custom module. Powerful stuff and very flexible.

You can update custom config with a settings form you build. 
In a custom module *custom_mailing* add a file called *custom_mailing.routing.yml* add the following route:

Make a views exposed form field required programmatically [drupal 8]

This is an interesting trick to make fields required in the front-end.

Check in twig if image field has value [drupal 8]

In a node teaser or full view mode it is for front-end purposes needed to know if an image is available. This snippet takes care of it.

Get views row count in twig [drupal 8]

When using twig, sometimes you would like to know whether the view has results or not. This snippet shows you how.

Get drupal 8 hostname

How do you get the base url of a drupal 8 website programmatically?

EntityQuery nodes with date field in drupal 8

Little snippet to show how to query nodes with f.e. condition of "1 week ago".
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