Drupal rules reset value to null how to#
Drupal rules reset value to null manual#
Drupal rules reset value to null code#

This module implements a truly dedicated entity. Core just handles the bulk of what you need if you just configure it right. No need to depend on a contrib module or figure out complex database schemas. Entitiesĭrupal 8 brought with it many great and wonderful things, the least of which is being able to create new entities (out-of-the-box) in a very easy to implement way. This inherently and dramatically forces the responsibility toward needing a dedicated module to handle all of the intricacies required for properly displaying a background image provided by a user. In Drupal 8, themes now have very limited 'power' in what hooks and plugins they are actually allowed to participate in. Sure, in Drupal 7, some of the modules used fields, but often times you still had to customize the output (usually in a theme) given your specific needs. I think one of the biggest challenges with this entire topic has always been 'Whose responsibility is it to handle the UI and then output of said background image?' In the past, there has never really been a clear delineation of whether this responsibility specifically fell to a module or to a theme.

One that eases the setup process and also brings an easier to use interface for your users. It was still time consuming to implement in a consistent fashion across all the moving parts (which is why a custom implementation was often easier).Ī solution in Drupal 8 can now be implemented in an entirely different way. This required the same type of field or formatter settings to be applied to every single entity/bundle you needed this functionality on. In Drupal 7, many of the 'solutions' were primarily focused on using custom field types or field formatters. Now, you may be thinking 'Great another module that does the same as another module, but only slightly different.' You would be kind of right, but it's actually quite a bit different than any previous implementation. While this did take some effort to do it just right (using custom image fields and then preprocessing via a sub-theme), it was relatively easy enough to accomplish if you knew what needed to be done. However, much of time, it was simply easier to implement an entirely custom solution. In Drupal 7, there were several modules that attempted to do just that. Over the past month, I have attempted to solve a lot of problems in regards to displaying a user provided image (via Drupal's UI) on a rendered page in the form of background-image: url(.) ) in Drupal 8.

Drupal rules reset value to null how to#

If you're just looking on how to setup this module, you can skip ahead to the Installation section. If your site is designed around utilizing background images, then this module is for you! Whether you need a surgical implementation that only administrators/developers can implement or provide the ability to allow users to attach their own background images to entities, this module has you covered.

Drupal rules reset value to null manual#

The other option is to have a manual checkbox to denote that the field value should be validated against a null value.Introducing a new, easy to use, Drupal 8 module for background images:

Drupal rules reset value to null code#

(save for option lists)Įither the code needs to sniff out if the field value has a selection to validate against and if not, then flag it as 'null' and the visibility rule will then validate against that null value. This use case appears to carry over into other fields as well, not just reference fields, though it's been awhile since I've tested other fields. Maybe this has something to do with the problem? However, because the visibility rules won't validate against a null value, it doesn't know what to do and hides it regardless.Ĭurrently when setting the 'NOT' option and leaving the field to a null value, upon saving, the 'NOT' is then unchecked. I would much rather hide the link if there's nothing to jump to. As a result, when a visibility rule is set, the jump link disappears regardless of whether there is a referenced node or not. In other words, if the reference field is blank (null) don't show the jump link. The visibility rule selection wants me to choose a specific node for the reference field, however I want the rule to 'NOT trigger when null'. The panel creates a simple jump link to the place on the page where the referenced node is located. In other words, if nothing is selected as a validation (null), then follow the visibility rule.įor example, I have a reference field with autocomplete.

There are times when a visibility rule needs to be followed for when the value in a field is null. Visibility rules do not accept 'null' values from fields that are not required, with the exception of select lists.