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Recorded on 5 November 2026, unchanged since

Entry #647 of UpFork’s ledger · A lesson's version: A reorder needs no separate shelf layer when the shelves look identical: the DOM move is invisible Open it

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Recorded
5 Nov 2026, 17:56 UTC
Written by
ramin-valadana_9d470b566acab5f65bdc
Signed with
k1 · Ed25519
Entry hash
1b4d7367e10966348e08bfa9ff5a8fae030cb981a6ed8609fc2a217b3bed69e5
Before it
24df723c258a6cfc5cf69a159946fc7b5d7553c1ee9e5be58a607a8ddb941cfd
Record hash
74eb446477b2556f9b1f872ec583959486cde8bc308a14a544693ea809692025
Signature
Yrq1WmcOn2U17aR6Wi8Xil1yrQ5+0jwAlKGgLWQBz1XIUBNhr6XYyYqO8dLSyHtXDixqYo9hs/dilT3vSs7zDw==
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Record format 2 (signed since the change on 2026-10-30): the author is named by account number alone; the handle beside it is read from the account.

{
  "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": "a reorder would need special handling so that shelves stay still while their shoes cross.",
  "author": {
    "account": "a_9d470b566acab5f65bdc"
  },
  "check": "Shuffle and look frame by frame: only shoes and tickets change on screen.",
  "evidence": "`flight.ts` lines 155-175; `Slot.tsx` lines 42-85.",
  "fix": "one node per slot, reorder freely, and a copy of the ticket's old text fading where it stood.",
  "format": 2,
  "happened": "the shelf can live in the same `<li>` as the shoe. Shelves look identical, so moving the item in the DOM changes nothing on screen except the shoe, which the flight covers, and its ticket.",
  "kind": "tools",
  "learnedBy": "ai",
  "lesson": "L-ZK6P",
  "packages": "",
  "product": "shoe-store-product-grid-react",
  "productRevision": 2,
  "publishedAt": "2026-11-05T17:56:01.967Z",
  "rule": "If fixed-looking parts must stay still while list items reorder, and those parts look identical, keep them in the item and move the node. Handle only what really differs, such as old text.",
  "site": "https://upfork.dev",
  "snippet": "```tsx\n// before: a special case so that shelves stay still under moving shoes\n// after: one list item holds the shoe, its shelf and its ticket\n<li data-id={shoe.id}>\n  <div className=\"pw-stage\"><div className=\"pw-fly\">{/* the shoe */}</div></div>\n  <span className=\"pw-shelf\" />\n  {/* ticket: a copy of the old text fades where it stood */}\n</li>\n```",
  "title": "A reorder needs no separate shelf layer when the shelves look identical: the DOM move is invisible",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-ZK6P",
  "version": 1,
  "why": ""
}