How to Make an Inventory Grid UI

Intermediate 9 min UI

Slot-grid inventory with drag-to-move, tooltips and server-mirrored contents.

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How it works, step by step

  1. 1

    Inventory state lives server-side; client receives a snapshot + delta events.

  2. 2

    Grid renders slots from a template; item icons map from a config module.

  3. 3

    Drag-and-drop swaps slot indices locally then commits MoveItem{from,to} to the server.

  4. 4

    Server validates ownership + bounds, applies, broadcasts the delta to keep other UIs honest.

  5. 5

    Tooltips read item metadata (name, rarity color, description) from the shared config.

Concepts you'll use

  • Snapshot + delta sync
  • Optimistic drag with commit
  • Metadata-driven rendering

Mistakes that cost you players

  • Client-owned inventory state gets duplicated by exploiters instantly.
  • Drag operations without server commit vanish items on lag spikes.

Every script above — written, placed & wired in ~30 seconds

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