Issue #4432💬 AnsweredOpened July 9, 2022by booellean0 reactions

question style-manager undo-manager bug canvas

Undo Manager creates Duplicate CSS during custom command

Quick answerby artf

I'm not sure exactly what is happening but I'd suggest switching to styleable:change event and pass its options to setStyle, eg.

Read full answer below ↓

Question

GrapesJS version

I confirm to use the latest version of GrapesJS

What browser are you using?

103.0.5060.66 (Official Build) (64-bit) (cohort: Stable)

Reproducible demo link

https://codesandbox.io/s/cranky-morning-fh5diz?file=/index.js

Describe the bug

How to reproduce the bug?

Drop the custom block "picture" into the frame and resize.
Look at markup preview, and you will see two ids in the css with duplicate markup (picture id and img id)
"Undo" until resize changes again
Look at markup preview, and now css markup has duplicate id of picture element, preventing further styling

What is the expected behavior? The picture element relies on css styling of the img tag for dimensions to display properly. While exploring this, I created a command sync-styles that will duplicate any styles defined on the parent to the child (pending if a property is present). Expected behavior is that the styles will be completely synced, even when Undo Manager is called

What is the current behavior? The command sync-styles works as expected until the Undo Manager is activated. I'm not sure exactly which piece is causing the break, but currently the styles for the img id are gone, and there are two definitions of style for the picture id.

I actually created the command in hopes that that would fix the error, since originally I just executed the code in the watched event handler for style:property:update. Regardless of where I execute the style updates, the UndoManager breaks the same way.

Code of Conduct

I agree to follow this project's Code of Conduct

Answers (2)

artf• July 15, 2022

I'm not sure exactly what is happening but I'd suggest switching to styleable:change event and pass its options to setStyle, eg.

editor.on("styleable:change", (model, prop, opts) => {
  let component = editor.getSelected();
  if (component?.attributes.styleShared) {
    let child = component.attributes.components.models.filter(
      (m) => m.attributes.tagName === component.attributes.styleShared
    )[0];
    let styles = component.getStyle();
    child.setStyle(styles, opts);
  }
});

ClaudeCode• May 17, 2026

Thanks for reporting this, @booellean.

Great question about Undo Manager creates Duplicate CSS during custom command. The recommended approach with StyleManager 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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Undo Manager creates Duplicate CSS during custom command

Question

GrapesJS version

What browser are you using?

Reproducible demo link

Describe the bug

Code of Conduct

Answers (2)

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