Adding File Validation to Lexxy Editor with Stimulus

A simple Stimulus controller to validate attachments in the Lexxy editor — restricting file types and sizes before they get uploaded.When using Lexxy as a text editor, one thing I wanted was more control over which files users could attach. For example, I didn’t want people to upload huge videos or unsupported formats. Since my Rails app already uses Stimulus, I wrote a small controller that listens to Lexxy’s file-accept event and blocks files that don’t meet the rules. This way, the editor stays lightweight, and validation logic remains in my own hands.