Preserve attributes on table paste

1

How to preserve cell attributes of exiting table when pasting another table? Now if I copy/paste a table, current attributes are being removed even if they are in schema. I use Tiptap but as it is made on top of Prosemirror, I ask here. I have checked the way prosemirror-table handles paste, and as far as I see tr.replace is used to replace content by Slices, and I cannot figure out how to get and put existing attributes to new cells.

2

Are your parseDOM and toDOM correct? You might not handle the attributes. I’d look there first, after that I’d go trough all the code that is called on paste events ( parseHTML, handlePaste, transformPastedHTML etc. )

3

Attribute has been added using TipTap extension API, like this:

addAttributes() {
    return {
      ...this.parent?.(),
      ["data-sync-id"]: {
        default: null,
        renderHTML: (attributes) => {
          if (!attributes["data-sync-id"]) {
            return null;
          }

          return {
            ["data-sync-id"]: attributes["data-sync-id"],
          };
        },
        parseHTML: (element) => {
          return element.getAttribute("data-sync-id");
        },
      },
    };
},

I suppose these methods use parseDOM and toDOM methods from prosemirror.

What do you mean to go through all the code that is called on paste events? Should I replace default behaviour with custom one somewhere in these events?

4

First I’d just log out things, see if they’re what you expect them to be.

5

Could you please clarify which things? I don’t just have idea where to start?

6

See what the pasted html element is, see the pasted text, check out how prosemirror handles pastes by default in prosemirror-view, see the created Slice after pasting etc. In short: start logging.

7

Alright I have made it in another way: I’m collecting attributes in a Map of Maps from oldState and then applying them to newState in appendTransaction.