Help needed: Nested Custom Blocks (IF/LOOP) in BlockNote

[Aichnerc]

Hi there,

I'm exploring the possibility of adding custom blocks (e.g., IF and LOOP) to BlockNote with the following functionality:

1. Custom Blocks:

   • Blocks (IF and LOOP) that include a single-line input field for parameters (e.g., x > 5 or while i < 10).
   • Full editor functionality inside these blocks (text, headings, images, etc.).

2. Nesting:

   • Support for nesting IF and LOOP blocks within each other or within other content in the editor.

3. Slash Menu Integration:

   • Allow IF and LOOP to be added directly via the slash menu.

4. Styling:

   • Visually distinguish these blocks with borders or other styles.

Additional Context

This functionality is similar to how callouts work in Notion, where you can add any type of content within a callout block. I’m aiming for a similar behavior, but with custom blocks (IF and LOOP) that include an input field for parameters.

Notion_SJ8R9gtvmE.mp4

Questions

• Is it possible to implement custom blocks with nested editor functionality using the current BlockNote framework?
• Can the BlockSchema API support this kind of nesting structure?
• Do you have any guidance or best practices for dynamically rendering and managing nested blocks within the editor?

Both Devin and Replit failed to help me design this.

Thank you in advance for your help! I’d love to know if this aligns with the capabilities of BlockNote or if there are any limitations I should be aware of.

[nperez0111]

See this example for implementing a custom block type: https://www.blocknotejs.org/docs/custom-schemas/custom-blocks

[Aichnerc]

See this example for implementing a custom block type: https://www.blocknotejs.org/docs/custom-schemas/custom-blocks

Yes, custom blocks are straightforward—I’ve worked with them extensively. The real challenge arises when trying to embed a fully functional editor within a block.

[simonprast]

+1

[coxato]

same question.
Any update about this, or this #1267 ??

[ClementNerma]

I currently have the same need, but nested custom blocks don't seem to be possible as of the current v0.25.2 version.
Any plan on supporting this? :)

[coxato]

I currently have the same need, but nested custom blocks don't seem to be possible as of the current v0.25.2 version. Any plan on supporting this? :)

Hi @ClementNerma, there is no changes yet, I just created an example here #1267
because the official maintainer @YousefED asked for a reproduceable error.

let's see if there are updates in the future. Hope this get fixed 🙏

[YousefED]

this is currently not possible and not planned (yet). let's track this here: #1540

Feel free to add to the thread what the exact use-cases are