GrapesJS Component with Monaco Editor

A plugin that allows you to edit the code of a component that is selected on the canvas using Monaco Editor (VS Code's editor) with syntax highlighting, auto-formatting, and advanced editing features.

VIEW DEMO - https://dev.use.senangwebs.com/maker/grapesjs-component-monaco-editor-demo

Features

• Monaco Editor Integration: Full VS Code editor experience with syntax highlighting
• Auto-formatting: Automatic code formatting for HTML and CSS (Ctrl+Shift+F / Cmd+Shift+F)
• Split View: Resizable HTML and CSS editors in a split-pane layout
• Real-time Preview: Live updates as you edit your code
• Dark Theme: Professional dark theme matching VS Code
• Keyboard Shortcuts: Standard VS Code shortcuts supported
• Error Detection: Built-in syntax error detection and highlighting
• IntelliSense: Code completion and suggestions
• Fallback Support: Graceful fallback to textarea if Monaco fails to load

Recommended: use grapesjs-parser-postcss with this plugin to avoid issues with styles as the default parser is inconsistent and will add a lot of extra rules to your css, more explained here

Chrome Result	PostCSS Result

HTML

<link href="https://unpkg.com/grapesjs/dist/css/grapes.min.css" rel="stylesheet">
<script src="https://unpkg.com/grapesjs"></script>

<link href="https://unpkg.com/grapesjs-component-monaco-editor/dist/grapesjs-component-monaco-editor.min.css" rel="stylesheet">
<script src="https://unpkg.com/grapesjs-component-monaco-editor"></script>

<div id="gjs"></div>

JS

const editor = grapesjs.init({
	container: '#gjs',
  height: '100%',
  fromElement: true,
  storageManager: false,
  //...
  panels: {
    defaults: [
      {
        buttons: [
          //...
          {
            attributes: { title: 'Open Code' },
            className: 'fa fa-code',
            command: 'open-code',
            id: 'open-code'
          }
          //...
        ],
        id: 'views'
      }
    ]
  },
  //...
  plugins: ['grapesjs-component-monaco-editor'],
});

CSS

body, html {
  margin: 0;
  height: 100%;
}

Keyboard Shortcuts

Shortcut	Action
Ctrl+Shift+F / Cmd+Shift+F	Format code
Ctrl+S / Cmd+S	Save (applies changes)
Ctrl+Z / Cmd+Z	Undo
Ctrl+Y / Cmd+Y	Redo
Ctrl+F / Cmd+F	Find
Ctrl+H / Cmd+H	Find and Replace

Options

Option name	Default value	Description
panelId	views-container	Id of panel to append code editor.
appendTo	.gjs-pn-views-container	Append code editor to an element notviews-container (class or id).
openState	{ pn: '35%', cv: '65%' }	Determine width of views panel (pn) and canvas (cv) in the open state.
closedState	{ pn: '15%', cv: '85%' }	Determine width of views panel (pn) and canvas (cv) in the closed state.
codeViewOptions	{}	Monaco editor options. (Monaco Editor Options)
preserveWidth	false	Stop resizingopenState and closedState. Preserve views panel and canvas sizes.
clearData	false	Remove allgjs-data attributes from the component.
editJs	false	Lets you edit component scriptsallowScripts must be set to true.
cleanCssBtn	true	Used to remove css from the Selector Manager.
htmlBtnText	Apply	Save HTML button text.
cssBtnText	Apply	Save CSS button text.
cleanCssBtnText	Delete	Clean CSS button text.

Monaco Editor Specific Options

The codeViewOptions object accepts all Monaco Editor configuration options. Common options include:

codeViewOptions: {
  theme: 'vs-dark', // or 'vs', 'hc-black'
  fontSize: 14,
  minimap: { enabled: false },
  wordWrap: 'on',
  formatOnType: true,
  formatOnPaste: true,
  automaticLayout: true
}

Tip: grapesjs-script-editor is better suited for editing scripts instead of using editJs, reason being editJs will inject scripts as separate components onto the canvas which often interferes with the main editor. grapesjs-script-editor avoids this by injecting scripts directly into a component therefore avoiding the use of allowScripts.

cleanCssBtn: When you delete a selector in the code-editor it is still in the Selector Manager therefore it will still affect the component after saving, this button removes the selector from both the code-editor and Selector Manager. Only valid css rules can be removed eg .class{ color: blue }

Auto-formatting

The plugin includes automatic code formatting for both HTML and CSS:

• HTML: Proper indentation, tag formatting, and structure
• CSS: Property alignment, selector formatting, and consistent spacing
• Trigger: Automatic on content load or manual via Ctrl+Shift+F / Cmd+Shift+F
• Fallback: Custom formatting algorithms if Monaco's built-in formatter fails

Download

• CDN
  • https://unpkg.com/grapesjs-component-monaco-editor
• NPM
  • npm i grapesjs-component-monaco-editor
• GIT
  • git clone https://github.com/a-hakim/grapesjs-component-monaco-editor.git

Usage

Directly in the browser

<link href="https://unpkg.com/grapesjs/dist/css/grapes.min.css" rel="stylesheet"/>
<script src="https://unpkg.com/grapesjs"></script>

<link href="./dist/grapesjs-component-monaco-editor.min.css" rel="stylesheet">
<script src="./dist/grapesjs-component-monaco-editor.min.js"></script>

<div id="gjs"></div>

<script type="text/javascript">
  var editor = grapesjs.init({
      container: '#gjs',
      // ...
      panels: { /* add panel button with command open-code */}
      plugins: ['grapesjs-component-monaco-editor'],
      pluginsOpts: {
        'grapesjs-component-monaco-editor': { /* options */ }
      }
  });
</script>

Modern javascript

import grapesjs from 'grapesjs';
import plugin from 'grapesjs-component-monaco-editor';
import 'grapesjs/dist/css/grapes.min.css';
import 'grapesjs-component-monaco-editor/dist/grapesjs-component-monaco-editor.min.css';

const editor = grapesjs.init({
  container : '#gjs',
  // ...
  plugins: [plugin],
  pluginsOpts: {
    [plugin]: { /* options */ }
  }
  // or
  plugins: [
    editor => plugin(editor, { /* options */ }),
  ],
});

Adding after editor initialization

const pn = editor.Panels;
const panelViews = pn.addPanel({
  id: 'views'
});
panelViews.get('buttons').add([{
  attributes: {
     title: 'Open Code'
  },
  className: 'fa fa-file-code-o',
  command: 'open-code',
  togglable: false, //do not close when button is clicked again
  id: 'open-code'
}]);

Development

Clone the repository

$ git clone https://github.com/a-hakim/grapesjs-component-monaco-editor.git
$ cd grapesjs-component-monaco-editor

Install dependencies

$ npm i

Build css

$ npm run build:css

Start the dev server

$ npm start

Build the source

$ npm run build

Technical Details

• Monaco Editor Version: 0.52.0 (loaded from CDN)
• Supported Languages: HTML, CSS with syntax highlighting
• Theme: VS Code dark theme
• Fallback: Textarea with basic styling if Monaco fails to load
• Split Layout: Powered by Split.js for resizable panes
• Dependencies: split.js for panel resizing

License

MIT