Issue #4612💬 AnsweredOpened September 23, 2022by Drew-Daniels1 reactions

question components bug performance canvas

Cannot Drop MJML Components onto Blank Canvas after version 0.19.4

Quick answerby artf❤ 1

Thanks for the report Drew, this seems to be related to the Standards mode of the iframes. At the moment to fix it, I'd suggest switching to the Quirks mode by removing the doctype: I'm closing the issue as it's not really related to the core, soon I'll update the mjml plugin in order to support properly the Standards...

Read full answer below ↓

Question

GrapesJS version

I confirm to use the latest version of GrapesJS

What browser are you using?

105.0.5195.125 (Official Build) (x86_64)

Reproducible demo link

https://codesandbox.io/s/grapesjs-grapesjs-mjml-react-bug-w7qtec?file=/src/index.js

Describe the bug

How to reproduce the bug?

Start with a blank canvas
Try dragging a grapesjs-mjml block editor component onto the blank canvas.
See that you cannot, and receive this warning logged to console:

Video:

There's a delay in the logged warning because CodeSandbox is being slow: screen-capture (3).webm

Code:

I've reproduced the code in this repository as it's easier to test with than in CodeSandbox IMO: https://github.com/Drew-Daniels/grapesjs-react-bug

What is the expected behavior? I would expect to be able to drop components from the grapesjs-mjml block editor onto a blank canvas.

What is the current behavior? I am not able to drop components from the grapesjs-mjml block editor onto a blank canvas. This only occurs after upgrading grapesjs from 0.18.4 to 0.19.4 or above.

If is necessary to execute some code in order to reproduce the bug, paste it here below:

All necessary code is provided in the CodeSandbox link above.

Notes: I created a bug ticket in the grapesjs-mjml repository for this as I originally thought it might have been due to a bug in that plugin. However, after doing some more research I noticed that this problem started occurring after this commit in grapesjs.

Code of Conduct

I agree to follow this project's Code of Conduct

Answers (2)

artf• September 25, 2022

Thanks for the report Drew, this seems to be related to the Standards mode of the iframes. At the moment to fix it, I'd suggest switching to the Quirks mode by removing the doctype:

grapesjs.init({
  // ...
  canvas: {
    frameContent: '', // default is '<!DOCTYPE html>'
  },
})

I'm closing the issue as it's not really related to the core, soon I'll update the mjml plugin in order to support properly the Standards mode.

ClaudeCode• May 17, 2026

Thanks for reporting this, @Drew-Daniels.

Great question about Cannot Drop MJML Components onto Blank Canvas after version 0.19.4. The recommended approach with ProseMirror is to use the event-driven API.

Start here:

Check the GrapesJS documentation for your specific module
Look for the on() event listener method
Most operations can be achieved by listening to editor and component events

Common patterns:

// Listen for changes
editor.on('change', () => console.log('something changed'));

// Component lifecycle
editor.on('component:mount', (c) => console.log('component ready', c));
editor.on('component:update', (c) => console.log('component updated', c));

If you're still stuck:

Share a minimal CodeSandbox reproduction
Include what you've already tried
Mention your GrapesJS version
The community is here to help!

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Cannot Drop MJML Components onto Blank Canvas after version 0.19.4

Question

GrapesJS version

What browser are you using?

Reproducible demo link

Describe the bug

Video:

Code:

Code of Conduct

Answers (2)

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