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feat(html): load the later chunks of a sheet on demand #1255

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andiwand merged 3 commits into from
Oct 24, 2026
Merged

feat(html): load the later chunks of a sheet on demand #1255

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73f640f
feat(html): load the later chunks of a sheet on demand
andiwand Oct 24, 2026
fe0eac0
test: advance the reference output to the sheet chunk loader
andiwand Oct 24, 2026
5c7f446
fix(html): list the resources of the sheet rows that load later
andiwand Oct 24, 2026
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3 changes: 3 additions & 0 deletions CHANGELOG.md
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Expand Up @@ -43,6 +43,9 @@ The release run heads these entries with the version and opens a fresh
the scripts, and the HTTP server serves them. A text file of 1 M lines is
then a page of 485 KB. `odr.search` finds only the loaded chunks, and a
print shows a chunk that has not loaded as empty space.
- `HtmlConfig::lazy_loading` loads the rows of a sheet the same way. The
sheet of 500 K cells in `efficiency-big-1.ods` is then a page of 370 KB.
Such a sheet has no sort control, because a sort needs every row.

### Spreadsheets

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15 changes: 12 additions & 3 deletions docs/design/lazy-loading.md
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@@ -1,7 +1,8 @@
# Lazy loading design

Status: level 1 has landed for text files (#1247), pdf (#1248) and sheets
(#1250), and level 3 for text files. The rest is a proposal. Issue #764.
(#1250), and level 3 for text files and sheets. The rest is a proposal.
Issue #764.

Related: [`editing.md`](editing.md) holds the editing mode, which a page that
drops content must keep working. [`txt-editing.md`](txt-editing.md) holds the
Expand Down Expand Up @@ -280,9 +281,17 @@ the limits can go up is the next measurement.
4. **Sheets, level 1** (decision 6). First the markup and the column
widths in the writer, and the row accessor in `spreadsheet.js`. Then the
geometry: `reflow`, the overlay, and the pin.
5. **Core per engine, level 3.** ods first (#781). The ods decode keeps
5. **Sheets, level 3, the page.** A chunk of rows after the first is an
empty table that names `sheet<n>-chunks/<m>.js`, on the decode as it is.
The view writes the rows of such a chunk to nothing, because that is
where it finds the chunk to end, and renders them again, with inline
styles, when the script is asked for. A sheet whose rows load has no
sort control, because a sort needs every row. The sheet of 500 K cells
in `efficiency-big-1.ods` is a page of 370 KB that paints after 107 ms.
6. **Core per engine, level 3.** ods first (#781). The ods decode keeps
`content.xml` and its DOM resident for editing. A render on demand that
does not hold them is a decision of its own.
does not hold them is a decision of its own. It waits for a measurement
of the page side.

## Open questions

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