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ckeditor5-phoenix

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CKEditor 5 for Phoenix - rich text editor for Elixir apps! Easy setup, supports live-view data binding, dynamic loading, and localization. Plug-and-play modules, JS hooks, and full customization support. Ready for both open-source and commercial use!

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# CKEditor 5 Phoenix Integration

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CKEditor 5 integration library for Phoenix (Elixir) applications. Provides web components and helper functions for seamless editor integration with support for classic, inline, balloon, and decoupled editor types.

> [!IMPORTANT]
> This package is unofficial and not maintained by CKSource. For official CKEditor 5 documentation, visit [ckeditor.com](https://ckeditor.com/docs/ckeditor5/latest/). If you encounter any issues in the editor, please report them on the [GitHub repository](https://github.com/ckeditor/ckeditor5/issues).

<p align="center">
  <img src="docs/intro-classic-editor.png" alt="CKEditor 5 Classic Editor in Phoenix (Elixir) application">
</p>

## Table of Contents

- [CKEditor 5 Phoenix Integration](#ckeditor-5-phoenix-integration)
  - [Table of Contents](#table-of-contents)
  - [Installation 🚀](#installation-)
    - [🔗 Compatibility](#-compatibility)
    - [🏠 Self-hosted](#-self-hosted)
    - [📡 CDN Distribution](#-cdn-distribution)
  - [Basic Usage 🏁](#basic-usage-)
  - [Configuration ⚙️](#configuration-️)
    - [Custom Presets 🧩](#custom-presets-)
    - [Dynamic presets 🎯](#dynamic-presets-)
    - [Providing the License Key 🗝️](#providing-the-license-key-️)
    - [Referencing DOM Elements in Config 🏷️](#referencing-dom-elements-in-config-️)
  - [Editor Types 🖊️](#editor-types-️)
    - [Classic editor 📝](#classic-editor-)
    - [Multiroot editor 🌳](#multiroot-editor-)
    - [Inline editor 📝](#inline-editor-)
    - [Balloon editor 🎈](#balloon-editor-)
    - [Decoupled editor 🌐](#decoupled-editor-)
    - [Paragraph-like editing 📄](#paragraph-like-editing-)
      - [Classic / Balloon / Inline editor](#classic--balloon--inline-editor)
      - [Multiroot editor](#multiroot-editor)
  - [Watchdog prop 🐶](#watchdog-prop-)
  - [Localization 🌍](#localization-)
    - [UI language and content language 🈯](#ui-language-and-content-language-)
    - [Global Translation Config 🛠️](#global-translation-config-️)
    - [Custom translations 🌐](#custom-translations-)
      - [Translation references 📝](#translation-references-)
  - [LiveView Sync 🔄](#liveview-sync-)
    - [Two-way Communication 🔄](#two-way-communication-)
      - [From Phoenix to JavaScript (Server → Client) 📥](#from-phoenix-to-javascript-server--client-)
      - [From JavaScript to Phoenix (Client → Server) 📤](#from-javascript-to-phoenix-client--server-)
      - [Multiroot editor 🌲](#multiroot-editor--1)
    - [Root attributes 🏷️](#root-attributes-️)
    - [Focus and blur events 👁️‍🗨️](#focus-and-blur-events-️️)
    - [Ready event ✅](#ready-event-)
  - [Forms Integration 🧾](#forms-integration-)
    - [Phoenix Form Helper 🧑‍💻](#phoenix-form-helper-)
    - [LiveView Handler ⚡](#liveview-handler-)
  - [Image Upload 🖼️](#image-upload-️)
    - [Enabling uploads 🚀](#enabling-uploads-)
    - [Base64 Uploads 🖼️](#base64-uploads-️)
    - [Backend Handling 📥](#backend-handling-)
      - [Using Built-in Controller 📦](#using-built-in-controller-)
      - [Custom Controller 🛠️](#custom-controller-️)
    - [CSRF Protection 🛡️](#csrf-protection-️)
  - [Custom plugins 🧩](#custom-plugins-)
  - [Context 🤝](#context-)
    - [Basic usage 🔧](#basic-usage--1)
    - [Custom context translations 🌐](#custom-context-translations-)
  - [Watch registered editors 👀](#watch-registered-editors-)
    - [Wait for particular editor to be registered ⏳](#wait-for-particular-editor-to-be-registered-)
    - [Run logic on editor initialization and restarts 🔄](#run-logic-on-editor-initialization-and-restarts-)
  - [Package development 🛠️](#package-development-️)
  - [Psst... 👀](#psst-)
  - [Trademarks 📜](#trademarks-)
  - [License 📜](#license-)

## Installation 🚀

Choose between two installation methods based on your needs. Both approaches provide the same functionality but differ in how CKEditor 5 assets are loaded and managed.

### 🔗 Compatibility

| CKEditor 5 Version | Integration Version |
|--------------------|---------------------|
| 43.x – 47.x        | `<= 1.26.0`         |
| >= 48.0            | `>= 1.27.0`         |

### 🏠 Self-hosted

Bundle CKEditor 5 with your application for full control over assets, custom builds, and offline support. This method is recommended for advanced users or production applications with specific requirements. It's also GPL-compliant.

**Complete setup:**

1. **Add dependency** to your `mix.exs`:

```elixir
   def deps do
     [
       {:ckeditor5_phoenix, "~> 1.28.2"}
     ]
   end
   ```

2. **Install CKEditor 5**

```bash
   mix ckeditor5.install # --premium --version 48.2.0
   # ... or: npm install ckeditor5 --prefix assets
   ```

3. **Add `ckeditor5.install` to `assets.setup` in `mix.exs`** (if using Mix installer):

```elixir
   "assets.setup": ["ckeditor5.install", ... ]
   ```

4. **Register JavaScript hook** in your `app.js`:

```javascript
   import { Hooks } from 'ckeditor5_phoenix';

const liveSocket = new LiveSocket('/live', Socket, {
     hooks: Hooks,
   });
   ```

5. **Import styles** in your `assets/css/app.css`:

```css
   @import "../../deps/ckeditor5/dist/ckeditor5.css";
   /* ... or: @import "../node_modules/ckeditor5/dist/ckeditor5.css"; */
   ```

6. **Import module in View**

```elixir
   defmodule MyAppWeb.PageHTML do
     # ... your other uses
     use CKEditor5
   end
   ```

7. **Use in templates** (no CDN assets needed):

```heex
   <.ckeditor id="editor" type="classic" value="<p>Hello world!</p>" />
   ```

> [!NOTE]
> Make sure you use `--splitting` and `--format=esm` options in your `esbuild` configuration. It'll allow package to lazy load CKEditor 5.

### 📡 CDN Distribution

Load CKEditor 5 directly from CKSource's CDN - no build configuration required. This method is ideal for most users who want quick setup and don't need custom builds.

**Complete setup:**

1. **Add dependency** to your `mix.exs`:

```elixir
   def deps do
     [
       {:ckeditor5_phoenix, "~> 1.28.2"}
     ]
   end
   ```

2. **Register JavaScript hook** in your `app.js`:

```javascript
   import { Hooks } from 'ckeditor5_phoenix';

const liveSocket = new LiveSocket('/live', Socket, {
     hooks: Hooks,
   });
   ```

3. **Exclude CKEditor from bundler** in your `config/config.exs`:

```elixir
   config :my_app, MyAppWeb.Endpoint,
     watchers: [
       esbuild: {Esbuild, :install_and_run, [
         :my_app,
         ~w(--external:ckeditor5 --external:ckeditor5-premium-features)
       ]}
     ]
   ```

4. **Add license key** (see [Providing the License Key 🗝️](#providing-the-license-key-️) section)

5. **Import module in View**

```elixir
   defmodule MyAppWeb.PageHTML do
     # ... your other uses
     use CKEditor5
   end
   ```

6. **Use in templates:**

```heex
   <%!-- Load CDN assets in <head> (based on `default` preset) --%>
   <.cke_cloud_assets />

<%!-- or with specific features (overrides `default` preset) --%>
   <.cke_cloud_assets translations={["pl", "de", "fr"]} premium />

<%!-- or with specific preset --%>
   <.cke_cloud_assets preset="inline" />

<%!-- Use editor anywhere in <body> --%>
   <.ckeditor id="editor" type="classic" value="<p>Hello world!</p>" />
   ```

That's it! 🎉

## Basic Usage 🏁

Render the `<.ckeditor>` component anywhere in your template. While most props are optional, setting an explicit `id` is recommended if you plan to reference the editor instance from JavaScript via the `EditorsRegistry` (e.g. to read content, attach listeners, or wait for initialization).

```heex
<%!-- CDN only: Load assets in <head> --%>
<.cke_cloud_assets />

<.ckeditor
  id="editor"                        
  type="classic"                     
  preset="default"                   
  value="<p>Hello world!</p>"        
  editable_height="300px"            
  language="pl"                      
  content_language="pl"              
  save_debounce_ms={300}             
  upload_url="/uploads"              
  watchdog={true}                    
  change_event={true}                
  root_attrs={%{}}                   
  root_model_element="$root"         
  focus_event={true}                 
  blur_event={true}                  
  ready_event={true}                 
  class="my-editor"                  
  style="border: 1px solid #ccc"    
/>
```

## Configuration ⚙️

You can configure the editor _presets_ in your `config/config.exs` file. The default preset is `:default`, which provides a basic configuration with a toolbar and essential plugins — you can browse its full definition [presets.ex](lib/presets.ex). The preset is a map that contains the editor configuration, including the toolbar items and plugins. There can be multiple presets, and you can switch between them by passing the `preset` keyword argument to the `ckeditor` component.

### Custom Presets 🧩

In order to override the default preset or add custom presets, you can add the following configuration to your `config/config.exs` file:

```elixir
# config/config.exs
config :ckeditor5_phoenix,
  presets: %{
    minimal: %{
      cloud: %{
        version: "46.0.0",
        premium: true,
        translations: ["pl"],
        ckbox: %{
          version: "1.0.0"
        }
      },
      config: %{
        toolbar: [:bold, :italic, :link],
        plugins: [:Bold, :Italic, :Link, :Essentials, :Paragraph]
      }
    },
    full: %{
      config: %{
        toolbar: [
          :heading, :|, :bold, :italic, :underline, :|,
          :link, :insertImage, :insertTable, :|,
          :bulletedList, :numberedList, :blockQuote
        ],
        plugins: [
          :Heading, :Bold, :Italic, :Underline, :Link,
          :ImageBlock, :ImageUpload, :Table, :List, :BlockQuote,
          :Essentials, :Paragraph
        ]
      }
    }
  }
```

In template:

```heex
<.ckeditor preset="minimal" value="<p>Simple editor</p>" />
```

### Dynamic presets 🎯

You can also create dynamic presets that can be modified at runtime. This is useful if you want to change the editor configuration based on user input or other conditions.

```elixir
defmodule MyApp.PageLive do
  use MyAppWeb, :live_view
  use CKEditor5

alias CKEditor5.Preset

def mount(_params, _session, socket) do
    preset = Preset.Parser.parse!(%{
      config: %{
        toolbar: [:bold, :italic, :link],
        plugins: [:Bold, :Italic, :Link, :Essentials, :Paragraph]
      }
    })

{:ok, assign(socket, preset: preset)}
  end
end
```

In template:

```heex
<.ckeditor preset={@preset} />
````

### Providing the License Key 🗝️

CKEditor 5 requires a license key when using the official CDN or premium features. You can provide the license key in two simple ways:

1. **Environment variable**: Set the `CKEDITOR5_LICENSE_KEY` environment variable before starting your Phoenix app. This is the easiest and most common way.
2. **Preset config**: You can also set the license key directly in your preset configuration in `config/config.exs`:

```elixir
   config :ckeditor5_phoenix,
     presets: %{
       default: %{
         license_key: "your-license-key-here"
       }
     }
   ```

If you use CKEditor 5 under the GPL license, you do not need to provide a license key. However, if you choose to set one, it must be set to `GPL`.

If both are set, the preset config takes priority. For more details, see the [CKEditor 5 licensing guide](https://ckeditor.com/docs/ckeditor5/latest/getting-started/licensing/license-and-legal.html).

### Referencing DOM Elements in Config 🏷️

You can reference DOM elements directly in your editor configuration using the special `{ $element: "selector" }` format. This is useful when you want to attach the editor's UI parts (like toolbars or editable areas) to specific elements in your HTML.

```elixir
# config/config.exs
config :ckeditor5_phoenix,
  presets: %{
    # ... other presets
    minimal: %{
      config: %{
        # ... other config
        yourPlugin: %{
          toolbar: %{ $element: "#my-toolbar" },
          editable: %{ $element: "#my-editable" }
        },
      }
    }
  }
```

This will find the elements with IDs `my-toolbar` and `my-editable` in the DOM and use them for the editor's UI. If the element is not found, a warning will be shown in the console.

## Editor Types 🖊️

CKEditor 5 Phoenix supports four distinct editor types, each designed for specific use cases. Choose the one that best fits your application's layout and functionality requirements.

### Classic editor 📝

Traditional WYSIWYG editor with a fixed toolbar above the editing area. Best for standard content editing scenarios like blog posts, articles, or forms.

![CKEditor 5 Classic Editor in Elixir Phoenix application with Menubar](https://raw.githubusercontent.com/Mati365/ckeditor5-phoenix/main/docs/classic-editor-with-toolbar.png)

```heex
<%!-- CDN assets in <head> --%>
<.cke_cloud_assets />

<%!-- Classic editor in <body> --%>
<.ckeditor
  type="classic"
  value="<p>Initial content here</p>"
  editable_height="300px"
/>
```

### Multiroot editor 🌳

Advanced editor supporting multiple independent editable areas within a single editor instance. Perfect for complex layouts like page builders, newsletters, or multi-section content management.

![CKEditor 5 Multiroot Editor in Elixir Phoenix application](https://raw.githubusercontent.com/Mati365/ckeditor5-phoenix/main/docs/multiroot-editor.png)

```heex
<%!-- CDN assets in <head> --%>
<.cke_cloud_assets />

<%!-- Editor container --%>
<.ckeditor type="multiroot" />

<%!-- Shared toolbar --%>
<.cke_ui_part name="toolbar" />

<%!-- Multiple editable areas --%>
<div class="flex flex-col gap-4">
  <.cke_editable
    root="header"
    value="<h1>Main Header</h1>"
    class="border border-gray-300"
  />
  <.cke_editable
    root="content"
    value="<p>Main content area</p>"
    class="border border-gray-300"
  />
  <.cke_editable
    root="sidebar"
    value="<p>Sidebar content</p>"
    class="border border-gray-300"
  />
</div>
```

### Inline editor 📝

Minimalist editor that appears directly within content when clicked. Ideal for in-place editing scenarios where the editing interface should be invisible until needed.

![CKEditor 5 Inline Editor in Elixir Phoenix application](https://raw.githubusercontent.com/Mati365/ckeditor5-phoenix/main/docs/inline-editor.png)

```heex
<%!-- CDN assets in <head> --%>
<.cke_cloud_assets />

<%!-- Inline editor --%>
<.ckeditor
  type="inline"
  value="<p>Click here to edit this content</p>"
  editable_height="300px"
/>
```

**Note:** Inline editors don't work with `<textarea>` elements and may not be suitable for traditional form scenarios.

### Balloon editor 🎈

Contextual editor that shows a floating toolbar near the selected text. Great for editing small content snippets or when you want to minimize UI clutter.

![CKEditor 5 Balloon Editor in Elixir Phoenix application](https://raw.githubusercontent.com/Mati365/ckeditor5-phoenix/main/docs/balloon-editor.png)

```heex
<%!-- CDN assets in <head> --%>
<.cke_cloud_assets />

<%!-- Balloon editor --%>
<.ckeditor
  type="balloon"
  value="<p>Click here to edit this content</p>"
  editable_height="300px"
/>
```

### Decoupled editor 🌐

Flexible editor where toolbar and editing area are completely separated. Provides maximum layout control for custom interfaces and complex applications.

![CKEditor 5 Decoupled Editor in Elixir Phoenix application](https://raw.githubusercontent.com/Mati365/ckeditor5-phoenix/main/docs/decoupled-editor.png)

```heex
<%!-- CDN assets in <head> --%>
<.cke_cloud_assets />

<%!-- Decoupled editor container --%>
<.ckeditor id="your-editor" type="decoupled">
  <div class="flex flex-col gap-4">
    <%!-- Toolbar can be placed anywhere --%>
    <.cke_ui_part name="toolbar" />

<%!-- Editable area with custom styling --%>
    <.cke_editable
      value="<p>Initial content here</p>"
      class="p-4 border border-gray-300 rounded"
      editable_height="300px"
    />
  </div>
</.ckeditor>
```

### Paragraph-like editing 📄

Paragraph-like editing mode restricts the editor's root to a single block element — by default a `<p>` — preventing users from inserting multiple top-level block elements (headings, lists, etc.). This is ideal for short-text fields such as article titles, captions, descriptions, or any place where you want the richness of inline formatting (bold, italic, links) but a single-paragraph constraint.

The feature is enabled by setting `root_model_element="$inlineRoot"` on the editor or editable component. This maps the CKEditor model root to the `$inlineRoot` schema element, which allows only inline content.

#### Classic / Balloon / Inline editor

For single-root editor types, set `root_model_element` directly on `<.ckeditor>`:

```heex
<%!-- CDN assets in <head> --%>
<.cke_cloud_assets />

<%!-- Paragraph-like classic editor — single <p>, inline formatting only --%>
<.ckeditor
  id="title-editor"
  type="classic"
  root_model_element="$inlineRoot"
  value="<p>Article title goes here</p>"
/>
```

The same attribute works with `balloon` and `inline` editor types:

```heex
<.ckeditor
  id="caption-editor"
  type="balloon"
  root_model_element="$inlineRoot"
  value="<p>Image caption</p>"
/>
```

#### Multiroot editor

In a multiroot setup each `<.cke_editable>` can independently decide whether it uses paragraph-like mode. Set `root_model_element="$inlineRoot"` on the specific editable roots that should be restricted, while leaving others unrestricted:

```heex
<%!-- CDN assets in <head> --%>
<.cke_cloud_assets />

<%!-- Multiroot editor container (no root_model_element here) --%>
<.ckeditor type="multiroot" id="page-editor" />

<%!-- Shared toolbar --%>
<.cke_ui_part name="toolbar" class="mb-4" />

<div class="flex flex-col gap-4">
  <%!-- Title root: paragraph-like, only inline content allowed --%>
  <.cke_editable
    root="title"
    root_model_element="$inlineRoot"
    value="<p>Page Title</p>"
    class="text-2xl font-bold border border-gray-300 p-2"
  />

<%!-- Lead root: paragraph-like, only inline content allowed --%>
  <.cke_editable
    root="lead"
    root_model_element="$inlineRoot"
    value="<p>Short introductory sentence.</p>"
    class="italic border border-gray-300 p-2"
  />

<%!-- Body root: normal editing, full block content allowed --%>
  <.cke_editable
    root="body"
    value="<p>Full article content with headings, lists, etc.</p>"
    class="border border-gray-300 p-2"
  />
</div>
```

When the editor initialises, each root whose `root_model_element` is set to `"$inlineRoot"` is registered with that model element name. You can verify this at runtime:

```javascript
import { EditorsRegistry } from 'ckeditor5_phoenix';

EditorsRegistry.the.waitFor('page-editor').then((editor) => {
  // '$inlineRoot' for restricted roots, '$root' for unrestricted ones
  console.log(editor.model.document.getRoot('title')?.name); // '$inlineRoot'
  console.log(editor.model.document.getRoot('body')?.name); // '$root'
});
```

## Watchdog prop 🐶

By default, the `<.ckeditor>` component uses a built-in watchdog mechanism to automatically restart the editor if it crashes (e.g., due to a JavaScript error). The watchdog periodically saves the editor's content and restores it after a crash, minimizing the risk of data loss for users.

The watchdog is enabled by default. To disable it, set the `watchdog` prop to `false`:

```heex
<.ckeditor
  type="classic"
  value="<p>Initial content</p>"
  watchdog={false}
/>
```

You can also fine-tune the watchdog behaviour by setting its parameters in your preset configuration in `config/config.exs`:

```elixir
config :ckeditor5_phoenix,
  presets: %{
    default: %{
      watchdog: %{
        # Maximum number of crashes before the watchdog stops restarting the editor.
        # Defaults to 3.
        crashNumberLimit: 5,

# Minimum time (in ms) that must pass without a crash for the crash counter
        # to be reset. Defaults to 5000 ms.
        minimumNonErrorTimePeriod: 10_000,

# How often (in ms) the watchdog saves the editor state to restore it
        # after a crash. Defaults to 5000 ms.
        saveInterval: 2_000
      },
      config: %{
        # ... your editor config
      }
    }
  }
```

> [!NOTE]
> These options map directly to the [CKEditor 5 Watchdog configuration](https://ckeditor.com/docs/ckeditor5/latest/api/module_watchdog_watchdog-WatchdogConfig.html). Refer to the official docs for the full list of available options.

## Localization 🌍

Support multiple languages in the editor UI and content. Learn how to load translations via CDN or configure them globally.

### UI language and content language 🈯

Use `language` to set the CKEditor UI language (menus, tooltips, labels) and `content_language` to set the language of the editable content (`lang` attribute in the editor area).

```heex
<.cke_cloud_assets translations={["pl"]} />

<.ckeditor
  id="article-editor"
  type="classic"
  language="pl"
  content_language="en"
  value="<p>Hello world!</p>"
/>
```

### Global Translation Config 🛠️

You can also configure translations globally in your `config/config.exs` file. This is useful if you want to load translations for multiple languages at once or set a default language for the editor. Keep in mind that this configuration is only used when loading translations via CDN. If you are using self-hosted setup, translations are handled by your bundler automatically.

```elixir
# config/config.exs
config :ckeditor5_phoenix,
  presets: %{
    default: %{
      cloud: %{
        translations: ["pl", "de", "fr"]  # CDN only
      }
    }
  }
```

**Note:** For self-hosted setups, translations are handled by your bundler automatically.

### Custom translations 🌐

You can also provide custom translations for the editor. This is useful if you want to override existing translations or add new ones. Custom translations can be provided in the preset configuration.

```elixir
# config/config.exs
config :ckeditor5_phoenix,
  presets: %{
    default: %{
      custom_translations: %{
        en: %{
          Bold: "Custom Bold",
          Italic: "Custom Italic"
        },
        pl: %{
          Bold: "Pogrubiony",
          Italic: "Kursywa"
        }
      }
    }
  }
```

#### Translation references 📝

Beyond static strings, the configuration itself can reference translation keys using the special
`$translation` object. This is resolved at initialization using the same translation packs
loaded for the editor (including any custom translations) and is particularly handy when
configuring plugin labels, toolbar items or other strings that should adapt to the UI language.

```elixir
# config/config.exs
config :ckeditor5_phoenix,
  presets: %{
    default: %{
      custom_translations: %{
        en: %{CustomPlugin: "Custom Bold"},
        pl: %{CustomPlugin: "Custom Plugin"}
      },
      config: %{
        customPlugin: %{ $translation: "CustomPlugin" }
      }
    }
  }
```

When the editor/context is created the reference will be replaced with the translated value for
`language.ui`. If no translation is found for the active locale, `null` is used and a warning is
logged.

## LiveView Sync 🔄

Enable real-time synchronization between the editor and your LiveView. Content changes are automatically sent to the server with configurable debouncing for performance optimization.

### Two-way Communication 🔄

CKEditor 5 Phoenix supports bidirectional communication between your LiveView server and the JavaScript editor instance. You can receive updates from the editor and programmatically control its content from your Elixir code.

![CKEditor 5 Classic Live Sync example](https://raw.githubusercontent.com/Mati365/ckeditor5-phoenix/main/docs/classic-live-sync-set-data.gif)

#### From Phoenix to JavaScript (Server → Client) 📥

There are two ways to update the editor content from your LiveView server:

1. **Reactive State Update (Recommended) ✨**

The simplest way to update the editor is to change the assign bound to the value attribute. LiveView handles the synchronization seamlessly without requiring manual event pushing.

```heex
    <button phx-click="load_template">Load Template</button>

<.ckeditor id="editor" value={@editor_value} />
    ```

```elixir
    defmodule MyAppWeb.EditorLive do
      use MyAppWeb, :live_view
      use CKEditor5

def mount(_params, _session, socket) do
        {:ok, assign(socket, editor_value: "<h1>Initial Content</h1>")}
      end

# Reactively updates the editor content by changing the assign
      def handle_event("load_template", _params, socket) do
        {:noreply, assign(socket, editor_value: "<h1>Daily Report</h1><p>Work is progressing well.</p>")}
      end
    end
    ```

2. **Imperative Update via `push_event` 🚀**

If you prefer not to continuously track the editor's state in your assigns, or if you need to force an update directly, you can push a standard Phoenix event to the client. The integration listens for the `ckeditor5:set-data` event and requires the `editorId` and data payload.

```heex
    <form phx-submit="force_set_data">
      <textarea name="new_content" placeholder="Enter HTML content..."></textarea>
      <button type="submit">Set Data</button>
    </form>
    ```

```elixir
    def handle_event("force_set_data", %{"new_content" => val}, socket) do
      # Forces an update by pushing an event directly to the specific editor instance
      {:noreply, push_event(socket, "ckeditor5:set-data", %{editorId: "editor", data: val})}
    end
    ```

#### From JavaScript to Phoenix (Client → Server) 📤

By adding the change_event attribute, the editor automatically sends content updates to your LiveView whenever the user types.

```heex
<.ckeditor id="editor" value={@content} change_event />
```

```elixir
# Receives content updates from the editor
def handle_event("ckeditor5:change", %{"data" => %{"main" => data}}, socket) do
  {:noreply, assign(socket, editor_value: data)}
end
```

You can use `setData` event to programmatically update the editor content from JavaScript. It'll be automatically synchronized with Phoenix if `change_event` is enabled.

```javascript
document.getElementById('update-button').addEventListener('click', async () => {
  const editor = await EditorsRegistry.the.get('editor');

editor.setData('<h1>New Content</h1><p>This content was set from JavaScript!</p>');
});
```

#### Multiroot editor 🌲

For multiroot editors, reactivity works on a per-root basis. You can iterate over your roots and sync changes accordingly.

![CKEditor 5 Multiroot Live Sync example](https://raw.githubusercontent.com/Mati365/ckeditor5-phoenix/main/docs/multiroot-live-sync.gif)

```heex
<.ckeditor type="multiroot" change_event />

<.cke_ui_part name="toolbar" class="mb-4" />

<div class="flex flex-col gap-6">
  <%= for root <- @roots do %>
    <.cke_editable root={root.id} value={root.value} />
  <% end %>
</div>
```

```elixir
def handle_event("ckeditor5:change", %{"data" => data}, socket) do
  updated_roots =
    Enum.map(socket.assigns.roots, fn root ->
      if Map.has_key?(data, root.id) do
        %{root | value: data[root.id]}
      else
        root
      end
    end)

{:noreply, assign(socket, roots: updated_roots)}
end
```

### Root attributes 🏷️

Each `<.cke_editable>` can carry a `root_attrs` map that is applied directly to the editor model root element. This means the attributes are part of the editor's internal data layer and can be read, observed, and manipulated through the editor API and custom plugins. This means that they are **NOT** HTML attributes added to the DOM element, but rather part of the "state" of the editor root that can be used in your custom plugins or configuration. Use it when you want to store some dynamic metadata from Phoenix that needs to be accessible in JavaScript or when you want to configure plugins based on dynamic values.

```heex
<.cke_editable
  root={root.id}
  value={root.value}
  root_attrs={%{
    "data-root-counter" => root.counter,
    "data-lang" => "en"
  }}
  class="mb-2 focus:outline-none"
/>
```

It's also possible to assign `root_attributes` on `<.ckeditor>` level, which will apply the attributes to main root by default. This is useful when you don't have multiple roots but still want to use dynamic attributes.

```heex
<.ckeditor
  value={@content}
  root_attrs={%{
    "data-content-id" => @content_id
  }}
/>
```

In order to check if the attributes are updated correctly, you can use CKEditor 5 differ result in your custom plugin.

```javascript
editor.model.document.registerPostFixer((writer) => {
  const root = editor.model.document.getRoot();
  const changes = root.differ.getChanges();

for (const change of changes) {
    if (change.type === 'attribute' && change.attributeKey === 'data-root-counter') {
      console.log('Root counter updated:', root.getAttribute('data-root-counter'));
    }
  }
});
```

### Focus and blur events 👁️‍🗨️

To handle focus and blur events, you can use the `focus_event` and `blur_event` attributes in the component. This allows you to capture when the editor gains or loses focus, which can be useful for tracking user interactions or saving content.

![CKEditor 5 Live Sync Focus example](https://raw.githubusercontent.com/Mati365/ckeditor5-phoenix/main/docs/live-sync-focus.gif)

```heex
<.ckeditor
  id="editor"
  value={@content}
  focus_event
  blur_event
/>
```

```elixir
def handle_event("ckeditor5:focus", %{"data" => data}, socket) do
  {:noreply, assign(socket, content: data["main"])}
end

def handle_event("ckeditor5:blur", %{"data" => data}, socket) do
  {:noreply, assign(socket, content: data["main"])}
end
```

These events are sent **immediately** when the editor gains or loses focus, allowing you to perform actions like saving content or updating UI elements.

### Ready event ✅

Sometimes you need to know when the editor has finished initializing so you can perform setup work (e.g. enable UI controls or notify the user). The `ready_event` attribute will make the component push a `ckeditor5:ready` event **once** as soon as the editor is ready.

```heex
<.ckeditor
  id="editor"
  value={@content}
  ready_event
/>
```

```elixir
def handle_event("ckeditor5:ready", %{"data" => data}, socket) do
  # editor is ready – maybe mark a flag in assigns
  {:noreply, assign(socket, editor_ready?: true)}
end
```

The payload contains the same root data object that change/focus/blur events include. This event is perfect for showing “editor initialized” messages or performing client‑side setup.

## Forms Integration 🧾

Seamlessly integrate CKEditor 5 with Phoenix forms and LiveView for robust content management. Learn how to handle form submissions and real-time updates.

### Phoenix Form Helper 🧑‍💻

The editor automatically creates hidden input fields for form integration. Content is synchronized with form fields using the `field` attribute, making it compatible with standard Phoenix form helpers.

```heex
<.form for={@form} phx-submit="save">
  <.ckeditor id="content-editor" field={@form[:content]} />

<button type="submit">Save</button>
</.form>
```

### LiveView Handler ⚡

Complete LiveView integration with event handling for both real-time updates and form processing.

```elixir
defmodule MyApp.PageLive do
  use MyAppWeb, :live_view
  use CKEditor5  # Adds event handlers

def mount(_params, _session, socket) do
    form = to_form(%{"content" => ""}, as: :form)
    {:ok, assign(socket, form: form)}
  end

# Handle real-time content changes
  def handle_event("ckeditor5:change", %{"data" => data}, socket) do
    # Update content in real-time
    updated_params = Map.put(socket.assigns.form.params, "content", data["main"])
    {:noreply, assign(socket, form: to_form(updated_params, as: :form))}
  end

# Handle form validation
  def handle_event("validate", %{"form" => params}, socket) do
    {:noreply, assign(socket, form: to_form(params, as: :form))}
  end

# Handle form submission
  def handle_event("save", %{"form" => params}, socket) do
    # Process and save form data
    case save_content(params) do
      {:ok, _} ->
        {:noreply, put_flash(socket, :info, "Content saved successfully!")}
      {:error, _} ->
        {:noreply, put_flash(socket, :error, "Failed to save content")}
    end
  end
end
```

## Image Upload 🖼️

CKEditor 5 Phoenix includes a dedicated upload adapter that integrates seamlessly with Phoenix applications. It handles image uploads using standard `multipart/form-data` requests and automatically includes CSRF tokens.

### Enabling uploads 🚀

To enable image uploads, simply provide the `upload_url` prop to the editor component. This URL should point to your Phoenix controller action that handles the file upload.

```heex
<.ckeditor
  id="editor"
  upload_url="/api/uploads"
  value="<p>Content with images</p>"
/>
```

Alternatively, you can configure the upload URL globally in your `config/config.exs`:

```elixir
config :ckeditor5_phoenix, :uploads, api_url: "/api/uploads"
```

When `upload_url` is configured (either via prop or globally), the editor will automatically:

1. Enable the `PhoenixUploadAdapter` plugin.
2. Disable conflicting adapters (like `SimpleUploadAdapter` or `Base64UploadAdapter`).
3. Send upload requests to the specified URL.

### Base64 Uploads 🖼️

If you prefer to store images as Base64 strings directly in the content (not recommended for production due to performance impact), you can set `upload_url` to `"base64"`.

```heex
<.ckeditor
  id="editor"
  upload_url="base64"
  value="<p>Content with images</p>"
/>
```

This will enable the `Base64UploadAdapter` and disable other upload adapters. It's default behavior if no `upload_url` is provided nor global configuration exists.

### Backend Handling 📥

The editor expects the server to return a JSON response containing the URL of the uploaded file:

```json
{
  "url": "https://example.com/images/foo.jpg"
}
```

In case of an error, return a JSON object with an error message:

```json
{
  "error": {
    "message": "File too big."
  }
}
```

#### Using Built-in Controller 📦

The package includes a ready-to-use `CKEditor5.Upload.Controller` that handles local file storage. To use it:

1. **Configure storage location**:

```elixir
   config :ckeditor5_phoenix, :uploads,
     folder: "priv/static/uploads",
     api_url: "/api/ckeditor5/uploads",
     url: "/uploads" # Base URL for serving files
   ```

2. **Add route** in your `router.ex`:

```elixir
   scope "/api/ckeditor5" do
     pipe_through :api # Ensure this pipeline expects JSON and is authorized

post "/upload", CKEditor5.Upload.Controller, :upload
   end
   ```

#### Custom Controller 🛠️

If you need custom logic (e.g., uploading to S3), create your own controller. The `folder` and `url` config options are not needed in this case. However, make sure `api_url` is set correctly.

```elixir
defmodule MyAppWeb.UploadController do
  use MyAppWeb, :controller

def upload(conn, %{"file" => upload}) do
    # 1. Handle the upload (e.g., store in S3)
    # 2. Return the public URL
    json(conn, %{url: "https://my-bucket.s3.amazonaws.com/..."})
  end
end
```

### CSRF Protection 🛡️

The adapter automatically fetches the CSRF token from the `meta[name="csrf-token"]` tag or `_csrf_token` cookie and sends it in the `X-CSRF-Token` header.

However, standard Phoenix `:api` pipelines often **do not** include CSRF protection by default. To secure your upload endpoint, ensure your pipeline includes the verification plug:

```elixir
pipeline :api do
  plug :accepts, ["json"]
  plug :fetch_session  # Required for CSRF protection
  plug :protect_from_forgery
end
```

## Custom plugins 🧩

To register a custom plugin, use the `registerCustomEditorPlugin` function. This function takes the plugin name and the plugin _reader_ that returns a class extending `Plugin`.

```javascript
import { CustomEditorPluginsRegistry as Registry } from 'ckeditor5_phoenix';

const unregister = Registry.the.register('MyCustomPlugin', async () => {
  // It's recommended to use lazy import to
  // avoid bundling ckeditor code in your application bundle.
  const { Plugin } = await import('ckeditor5');

return class extends Plugin {
    static get pluginName() {
      return 'MyCustomPlugin';
    }

init() {
      console.log('MyCustomPlugin initialized');
      // Custom plugin logic here
    }
  };
});
```

In order to use the plugin you need to extend your config in `config/config.exs`:

```elixir
config :ckeditor5_phoenix,
  presets: %{
    default: %{
      config: %{
        plugins: [:MyCustomPlugin, :Essentials, :Paragraph],
        # ... other config options
      }
    }
  }
```

It must be called before the editor is initialized. You can unregister the plugin later by calling the returned function:

```javascript
unregister();
// or CustomEditorPluginsRegistry.the.unregister('MyCustomPlugin');
```

If you want to de-register all registered plugins, you can use the `unregisterAll` method:

```javascript
import { CustomEditorPluginsRegistry } from 'ckeditor5_phoenix';

CustomEditorPluginsRegistry.the.unregisterAll();
```

## Context 🤝

The **context** feature is designed to group multiple editor instances together, allowing them to share a common context. This is particularly useful in collaborative editing scenarios, where users can work together in real time. By sharing a context, editors can synchronize features such as comments, track changes, and presence indicators across different editor instances. This enables seamless collaboration and advanced workflows in your Phoenix application.

For more information about the context feature, see the [CKEditor 5 Context documentation](https://ckeditor.com/docs/ckeditor5/latest/features/collaboration/context-and-collaboration-features.html).

![CKEditor 5 Context in Elixir Phoenix application](https://raw.githubusercontent.com/Mati365/ckeditor5-phoenix/main/docs/context.png)

### Basic usage 🔧

Define your context in configuration:

```elixir
config :ckeditor5_phoenix,
  contexts: %{
    "your-context" => %{
      config: %{
        plugins: [
          :CustomContextPlugin
        ]
      },
      watchdog: %{
        crashNumberLimit: 20
      }
    }
  },
  presets: %{
    # ...
  }
```

And use it in your LiveView:

```heex
<.cke_context context="your-context">
  <.ckeditor class="mb-6" value="Child A" />
  <.ckeditor value="Child B" />
</.cke_context>
```

Voila!

> [!NOTE]
> The `context` attribute accepts also `CKEditor5.Context` structure, so it can be used in LiveView assigns or other dynamic contexts.

### Custom context translations 🌐

Define your custom translations in the configuration:

```elixir
config :ckeditor5_phoenix,
  contexts: %{
    "custom" => %{
      # ...
      custom_translations: %{
        en: %{
          Bold: "Custom Bold",
          Italic: "Custom Italic"
        },
        pl: %{
          Bold: "Pogrubiony",
          Italic: "Kursywa"
        }
      }
    }
  }
```

These translations will be used in the context's editors, overriding the default translations. They are available through `locale.t` plugin in every context plugin.

## Watch registered editors 👀

You can watch the registered editors using the `watch` function. This is useful if you want to react to changes in the registered editors, for example, to update the UI or perform some actions when an editor is added or removed.

```javascript
import { EditorsRegistry } from 'ckeditor5_phoenix';

const unregisterWatcher = EditorsRegistry.the.watch((editors) => {
  console.log('Registered editors changed:', editors);
});

// Later, you can unregister the watcher
unregisterWatcher();
```

### Wait for particular editor to be registered ⏳

You can also wait for a specific editor to be registered using the `waitForEditor` function. This is useful if you want to perform some actions after a specific editor is registered.

This method can be called before the editor is initialized, and it will resolve when the editor is registered.

```javascript
import { EditorsRegistry } from 'ckeditor5_phoenix';

EditorsRegistry.the.waitFor('editor1').then((editor) => {
  console.log('Editor "editor1" is registered:', editor);
});

// ... init editor somewhere later
```

The `id` of the editor must be used to identify the editor. If the editor is already registered, the promise will resolve immediately.

### Run logic on editor initialization and restarts 🔄

You can use the `mountEffect` method to run specific logic every time a particular editor is initialized or restarted. This is the recommended approach for adding integrations that require a fresh setup for each new instance of the editor.

Unlike a one-time promise, this callback is executed throughout the editor's lifecycle whenever it is mounted.

```javascript
import { EditorsRegistry } from 'ckeditor5_phoenix';

EditorsRegistry.the.mountEffect('editor1', (editor) => {
  const watcher = () => {
    console.info('Changed data:', editor.getData());
  };

editor.model.document.on('change:data', watcher);

// Cleanup: This will be executed when the editor is unmounted.
  return () => {
    editor.model.document.off('change:data', watcher);
  };
});
```

The `id` is used to target the specific editor. If the editor is already initialized when `mountEffect` is called, the callback will execute immediately.

## Package development 🛠️

In order to contribute to CKEditor 5 Phoenix or run it locally for manual testing, here are some handy commands to get you started.

To run the minimal Phoenix application with CKEditor 5 integration, install dependencies and start the server:

```bash
mix playground
```

In order to run the playground in cloud mode, set the `CKEDITOR5_PLAYGROUND_MODE` environment variable to `cloud`:

```bash
CKEDITOR5_PLAYGROUND_MODE=cloud mix playground
```

Run tests using the `mix test` command. All tests are located in the `test/` directory.

```bash
mix test
```

To generate a code coverage report, use:

```bash
mix coveralls.html
```

## Psst... 👀

Discover related projects for other frameworks and languages. Find inspiration or alternative integrations for CKEditor 5.

Looking for similar projects or inspiration? Check out these repositories:

- [ckeditor5-rails](https://github.com/Mati365/ckeditor5-rails)
  Effortless CKEditor 5 integration for Ruby on Rails. Works seamlessly with standard forms, Turbo, and Hotwire. Easy setup, custom builds, and localization support.

- [ckeditor5-livewire](https://github.com/Mati365/ckeditor5-livewire)
  Plug-and-play CKEditor 5 solution for Laravel + Livewire applications. Fully compatible with Blade forms. Includes JavaScript hooks, flexible configuration, and easy customization.

- [ckeditor5-symfony](https://github.com/Mati365/ckeditor5-symfony)
  Native CKEditor 5 integration for Symfony. Works with Symfony 6.x+, standard forms and Twig. Supports custom builds, multiple editor configurations, asset management, and localization. Designed to be simple, predictable, and framework-native.

## Trademarks 📜

Information about CKEditor® trademarks and licensing. Clarifies the relationship between this package and CKSource.

CKEditor® is a trademark of [CKSource Holding sp. z o.o.](https://cksource.com/) All rights reserved. For more information about the license of CKEditor® please visit [CKEditor's licensing page](https://ckeditor.com/legal/ckeditor-oss-license/).

This package is not owned by CKSource and does not use the CKEditor® trademark for commercial purposes. It should not be associated with or considered an official CKSource product.

## License 📜

Details about the MIT license for this project and CKEditor 5's GPL license. Make sure to review both licenses for compliance.

This project is licensed under the terms of the [MIT LICENSE](LICENSE).

This project injects CKEditor 5 which is licensed under the terms of [GNU General Public License Version 2 or later](https://www.gnu.org/licenses/old-licenses/gpl-2.0.html). For more information about CKEditor 5 licensing, please see their [official documentation](https://ckeditor.com/legal/ckeditor-oss-license/).

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