loading code fetching the highlighted snippet
FIG-001/ HISTORY
history loading.
Scroll up to trigger older message loading while the viewport preserves its visible anchor as messages are prepended above.
- Scroll near the top and
onNeedHistoryfires, so you can fetch an older batch and prepend it to the messages array — the chat starts with the most recent messages loaded. - As older messages are prepended above, the viewport preserves its visible anchor — the message you were reading stays exactly where it was, with no jump.
- Anchor preservation compensates for the height of the inserted batch, so scrollTop is corrected in the same frame the messages land.
- Keep scrolling up to page through the full backlog. The scroll-away state means loading history never yanks you back to the bottom.
category · history
sheet · sheet 01 / 01
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