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I am really not sure how to write the code. How do I get all the headings from the page? To be specific, core/heading. I wanted to make a sidebar so that the user can just jump from one section to another. Please see the image below.

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    You mean an outliner or table of contents? Such a block already exists in Gutenberg as part of the full site editing initiative, you can see its source code here github.com/WordPress/gutenberg/tree/trunk/packages/…
    – Tom J Nowell
    Apr 5 at 15:37
  • Hi Tom. Thanks for the response. Yes, like table of contents. How do I find every heading(core/heading), add ID, and add heading link to sidebar.
    – ddd
    Apr 6 at 8:24
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Update on this. I got the answer! I followed this simple code from https://goran-s.in.rs/table-of-contents-wordpress-without-plugin/

It's working fine!

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