VBO Validation

VBO Validation is a module that provides hooks to add validation between the execution of a VBO and its form or confirmation step.

Adding validation to prevent a VBO from executing is easy when you have a form step. But without a custom form, adding a validate function is a delicate exercise of making your module invoke last, form altering, checking for the existence of certain form elements and actions, and then adding your validation hook.

Here is a shortcut to that process!

This module will provide you with two hooks:

* hook_vbo_validation_validate - Perform validations before the confirmation step of a VBO is fired.

* hook_vbo_validation_ACTION_ID_validate - Provide a VBO-specific validation instead of the global hook_vbo_validation_validate().