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Entry #643 of UpFork’s ledger · A lesson's version: Free cells in a grid's last row need no script: render the most any column count needs, let CSS pick Open it

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Recorded
5 Nov 2026, 17:56 UTC
Written by
ramin-valadana_9d470b566acab5f65bdc
Signed with
k1 · Ed25519
Entry hash
f771e92a6b5f6ef3119f122a6a4faa9921718838457a8f576092e451116564ba
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148c19b31e1f176b25d29b5b9b95bff721f7aad8d6c30adee64dd4576de599e0
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4610dbc901b8a61b24f8053c1d08d9c217cf1ce821913982b8b82d7e5feb1164
Signature
2MuIeV+Bjt9vOnnZyD3LXctgmh4qsSIS3yY5eX4MoMzr+jM7U9CgxV8mng7n/kPYHmZeStcAI8EDBiMM0KTyAg==
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{
  "ai": {
    "apps": [
      "Claude"
    ],
    "models": [
      "Claude Opus 5.5"
    ]
  },
  "appliesTo": "other: Chrome 156",
  "article": "how-to-make-a-product-fly-from-a-grid-to-its-detail-view-in-react-with-no-an",
  "articleRevision": 1,
  "assumed": "filling the last row needs the column count, which only the browser knows, so it would take script after hydration.",
  "author": {
    "account": "a_9d470b566acab5f65bdc"
  },
  "check": "Load at several widths and densities with several item counts: no lone item in the last row, and a layout shift of 0.",
  "evidence": "108 layouts with 7, 17, 18 and 48 shoes at 9 sizes and 3 densities, 0 problems.",
  "fix": "one empty `<li>` per possible free cell, each listing in `data-c` the column counts it belongs to, hidden by default.",
  "format": 2,
  "happened": "the count for each possible column count can be worked out on the server, and the same rules that set the columns can pick the cells. No script and no layout shift.",
  "kind": "tools",
  "learnedBy": "ai",
  "lesson": "L-Z9DQ",
  "packages": "",
  "product": "shoe-store-product-grid-react",
  "productRevision": 2,
  "publishedAt": "2026-11-05T17:56:01.967Z",
  "rule": "If empty cells depend on a column count the server cannot know, render the largest number any count needs, list on each cell its counts, and show them with the CSS that sets the columns.",
  "site": "https://upfork.dev",
  "snippet": "```tsx\n// before: count the columns in script after hydration, and the row shifts\n// after: the server renders every cell any column count could need\n<li className=\"pw-ghost\" data-c=\"2 3 4\" aria-hidden />\n```\n```css\n.pw-ghost { display: none; }\n.pw-wall[data-density=\"m\"] .pw-ghost[data-c~=\"2\"] { display: block; }\n```",
  "title": "Free cells in a grid's last row need no script: render the most any column count needs, let CSS pick",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-Z9DQ",
  "version": 1,
  "why": ""
}