tiptap-editor-scroll

name	tiptap-editor-scroll
description	Correct patterns for text selection dispatch and scroll in the writeme-editor Tiptap instance. Use when implementing selection navigation, find/replace, search result highlighting, or any code that scrolls to a ProseMirror position in this editor. Trigger on editor.commands.setTextSelection, scrollIntoView, scrollTo, coordsAtPos, or any navigation to a match/result in the editor.

Tiptap text selection and scroll in writeme-editor

The two pitfalls that always appear together

Pitfall 1: editor.commands.setTextSelection silently calls .scrollIntoView()

editor.commands.setTextSelection appends .scrollIntoView() to the transaction before dispatching. In writeme-editor the editor sits inside a custom scroll container (#main-scroll-container), not the document body. ProseMirror's .scrollIntoView() targets the wrong scrollable ancestor and either does nothing or jumps to the wrong position.

Wrong:

editor.commands.setTextSelection({ from: result.from, to: result.to });
// scrollIntoView() fires automatically — broken in this editor

Right: dispatch the selection transaction yourself using editor.view.dispatch:

const selTr = editor.state.tr.setSelection(TextSelection.create(editor.state.doc, result.from, result.to));
editor.view.dispatch(selTr);

Import TextSelection from @tiptap/pm/state.

Pitfall 2: Synchronous scrollToPos races ProseMirror/React DOM updates

Calling the scroll helper immediately after editor.view.dispatch(selTr) reads coordinates before ProseMirror has painted the updated DOM. The computed coords.top is stale and the scroll lands at the wrong position.

Wrong:

editor.view.dispatch(selTr);
scrollToPos(editor.view, pos); // too early — DOM not yet updated

Right: wrap in requestAnimationFrame:

editor.view.dispatch(selTr);
requestAnimationFrame(() => scrollToPos(editor.view, pos));

Correct patterns

Custom scroll helper (scrollToPos)

The scroll container is #main-scroll-container (defined in src/app/layouts/main.layout.tsx). Use coordsAtPos to get the absolute coordinates of the target position, subtract the container's bounding rect, and target 1/3 from the top of the visible area.

function scrollToPos(view: EditorView, pos: number): void {
    const container = document.getElementById("main-scroll-container");
    if (!container) return;
    try {
        const coords = view.coordsAtPos(pos);
        const containerRect = container.getBoundingClientRect();
        const targetScrollTop = container.scrollTop + coords.top - containerRect.top - containerRect.height / 3;
        container.scrollTop = Math.max(0, targetScrollTop);
    } catch {}
}

Safe selection dispatch

Never use editor.commands.setTextSelection. Build and dispatch the transaction directly:

import { TextSelection } from "@tiptap/pm/state";

const selTr = editor.state.tr.setSelection(TextSelection.create(editor.state.doc, from, to));
editor.view.dispatch(selTr);
requestAnimationFrame(() => scrollToPos(editor.view, from));

Full navigation pattern (next/previous result)

As used in src/app/extensions/search-replace.ts:

nextSearchResult:
  () =>
  ({ editor }) => {
    const s = srStorage(editor);
    if (s.results.length === 0) return false;
    s.resultIndex = (s.resultIndex + 1) % s.results.length;
    editor.view.dispatch(editor.state.tr.setMeta(pluginKey, { forceUpdate: true }));
    const current = s.results[s.resultIndex];
    if (current) {
      const selTr = editor.state.tr.setSelection(
        TextSelection.create(editor.state.doc, current.from, current.to)
      );
      editor.view.dispatch(selTr);
      requestAnimationFrame(() => scrollToPos(editor.view, current.from));
    }
    return true;
  },

Key file references

• src/app/extensions/search-replace.ts — scrollToPos, all navigation commands
• src/app/components/find-replace-bar.tsx — consumer of the extension commands
• src/app/layouts/main.layout.tsx — defines id="main-scroll-container"

Checklist for diagnosing scroll/selection bugs

• Is editor.commands.setTextSelection used anywhere in the navigation path? Replace with editor.view.dispatch(tr.setSelection(TextSelection.create(...))).
• Is scrollToPos (or any scrollTop assignment) called synchronously after dispatch? Wrap in requestAnimationFrame.
• Is document.getElementById("main-scroll-container") returning null? Check that the layout renders with that id before the editor mounts.
• Is coordsAtPos throwing? The try/catch in scrollToPos swallows it silently — add a console.error temporarily to confirm.
• Is scroll happening to the right element but the wrong position? Verify the 1/3-from-top math: container.scrollTop + coords.top - containerRect.top - containerRect.height / 3.
• After a replaceAll, are decorations stale? Dispatch a setMeta(pluginKey, { forceUpdate: true }) transaction to force the plugin to rebuild decorations.