**DO NOT READ THIS FILE ON GITHUB, GUIDES ARE PUBLISHED ON https://guides.rubyonrails.org.** Action Text Overview ==================== This guide provides you with all you need to get started in handling rich text content. After reading this guide, you will know: * How to configure Action Text. * How to handle rich text content. * How to style rich text content. -------------------------------------------------------------------------------- Introduction ------------ Action Text brings rich text content and editing to Rails. It includes the [Trix editor](https://trix-editor.org) that handles everything from formatting to links to quotes to lists to embedded images and galleries. The rich text content generated by the Trix editor is saved in its own RichText model that's associated with any existing Active Record model in the application. Any embedded images (or other attachments) are automatically stored using Active Storage and associated with the included RichText model. ## Trix compared to other rich text editors Most WYSIWYG editors are wrappers around HTML’s `contenteditable` and `execCommand` APIs, designed by Microsoft to support live editing of web pages in Internet Explorer 5.5, and [eventually reverse-engineered](https://blog.whatwg.org/the-road-to-html-5-contenteditable#history) and copied by other browsers. Because these APIs were never fully specified or documented, and because WYSIWYG HTML editors are enormous in scope, each browser's implementation has its own set of bugs and quirks, and JavaScript developers are left to resolve the inconsistencies. Trix sidesteps these inconsistencies by treating contenteditable as an I/O device: when input makes its way to the editor, Trix converts that input into an editing operation on its internal document model, then re-renders that document back into the editor. This gives Trix complete control over what happens after every keystroke, and avoids the need to use execCommand at all. ## Installation Run `rails action_text:install` to add the Yarn package and copy over the necessary migration. Also, you need to set up Active Storage for embedded images and other attachments. Please refer to the [Active Storage Overview](active_storage_overview.html) guide. ## Examples Adding a rich text field to an existing model: ```ruby # app/models/message.rb class Message < ApplicationRecord has_rich_text :content end ``` Then refer to this field in the form for the model: ```erb <%# app/views/messages/_form.html.erb %> <%= form_with(model: message) do |form| %>