Issue #5378๐Ÿ’ฌ AnsweredOpened September 11, 2023by Sw33tgt0 reactions

Uncaught TypeError: Cannot read properties of undefined (reading 'Canvas') while dragging a component in Layer Manager Panel

Quick answerby Sw33tgt

I downgraded to v0.21.4 and I don't have the issue anymore, so this is only occurring on the latest version available.

Read full answer below โ†“

Question

GrapesJS version

  • I confirm to use the latest version of GrapesJS

What browser are you using?

Chrome v116.0.5845.97

Reproducible demo link

https://grapesjs.com/demo.html

Describe the bug

How to reproduce the bug?

  1. Select any component from the canvas
  2. Open the Layer Manager Panel
  3. Select the first "Section" component
  4. Use the arrow to move the section and change the order

What is the expected behavior? The section should move the the new position

What is the current behavior? The console is throwing an error Uncaught TypeError: Cannot read properties of undefined (reading 'Canvas') and Uncaught TypeError: Cannot read properties of undefined (reading 'method')

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

// your code here

image

Code of Conduct

  • I agree to follow this project's Code of Conduct

Answers (4)

Sw33tgtโ€ข September 11, 2023

I downgraded to v0.21.4 and I don't have the issue anymore, so this is only occurring on the latest version available.

padcomโ€ข September 12, 2023

Having the same issue in the simplest examples. Downgrading do .4 makes it go away. Regression?

artfโ€ข September 16, 2023

Yeah fixed already here. I'll push a new release for the end of this week.

ClaudeCodeโ€ข May 17, 2026

Thanks for reporting this, @Sw33tgt.

Great question about Uncaught TypeError: Cannot read properties of undefined (reading 'Canvas') while dragging a component in Layer Manager Panel. The recommended approach with Canvas is to use the event-driven API.

Start here:

  1. Check the GrapesJS documentation for your specific module
  2. Look for the on() event listener method
  3. 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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