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Convert examples to use `form_with` instead of `form_for` or `form_tag`,
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101 lines
3.5 KiB
Markdown
101 lines
3.5 KiB
Markdown
**DO NOT READ THIS FILE ON GITHUB, GUIDES ARE PUBLISHED ON https://guides.rubyonrails.org.**
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Action Text Overview
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====================
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This guide provides you with all you need to get started in handling
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rich text content.
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After reading this guide, you will know:
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* How to configure Action Text.
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* How to handle rich text content.
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* How to style rich text content.
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--------------------------------------------------------------------------------
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Introduction
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------------
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Action Text brings rich text content and editing to Rails. It includes
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the [Trix editor](https://trix-editor.org) that handles everything from formatting
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to links to quotes to lists to embedded images and galleries.
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The rich text content generated by the Trix editor is saved in its own
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RichText model that's associated with any existing Active Record model in the application.
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Any embedded images (or other attachments) are automatically stored using
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Active Storage and associated with the included RichText model.
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## Trix compared to other rich text editors
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Most WYSIWYG editors are wrappers around HTML’s `contenteditable` and `execCommand` APIs,
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designed by Microsoft to support live editing of web pages in Internet Explorer 5.5,
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and [eventually reverse-engineered](https://blog.whatwg.org/the-road-to-html-5-contenteditable#history)
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and copied by other browsers.
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Because these APIs were never fully specified or documented,
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and because WYSIWYG HTML editors are enormous in scope, each
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browser's implementation has its own set of bugs and quirks,
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and JavaScript developers are left to resolve the inconsistencies.
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Trix sidesteps these inconsistencies by treating contenteditable
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as an I/O device: when input makes its way to the editor, Trix converts that input
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into an editing operation on its internal document model, then re-renders
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that document back into the editor. This gives Trix complete control over what
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happens after every keystroke, and avoids the need to use execCommand at all.
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## Installation
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Run `rails action_text:install` to add the Yarn package and copy over the necessary migration.
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Also, you need to set up Active Storage for embedded images and other attachments.
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Please refer to the [Active Storage Overview](active_storage_overview.html) guide.
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## Examples
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Adding a rich text field to an existing model:
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```ruby
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# app/models/message.rb
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class Message < ApplicationRecord
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has_rich_text :content
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end
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```
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Then refer to this field in the form for the model:
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```erb
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<%# app/views/messages/_form.html.erb %>
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<%= form_with model: message do |form| %>
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<div class="field">
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<%= form.label :content %>
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<%= form.rich_text_area :content %>
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</div>
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<% end %>
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```
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And finally display the sanitized rich text on a page:
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```erb
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<%= @message.content %>
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```
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To accept the rich text content, all you have to do is permit the referenced attribute:
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```ruby
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class MessagesController < ApplicationController
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def create
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message = Message.create! params.require(:message).permit(:title, :content)
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redirect_to message
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end
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end
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```
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## Custom styling
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By default, the Action Text editor and content is styled by the Trix defaults.
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If you want to change these defaults, you'll want to remove
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the `app/assets/stylesheets/actiontext.scss` linker and base your stylings on
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the [contents of that file](https://raw.githubusercontent.com/basecamp/trix/master/dist/trix.css).
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You can also style the HTML used for embedded images and other attachments (known as blobs).
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On installation, Action Text will copy over a partial to
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`app/views/active_storage/blobs/_blob.html.erb`, which you can specialize.
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