When to Use Html.Keyed vs Plain Html for Lists in Elm 0.19
Guide for deciding between Html.Keyed and plain Html lists in Elm 0.19, with constraints, trade-offs, example code, and validation steps.
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Guide for deciding between Html.Keyed and plain Html lists in Elm 0.19, with constraints, trade-offs, example code, and validation steps.
Elm's Html.keyed lists can misbehave if keys are missing, non‑unique, or unstable. This guide walks through symptoms, diagnoses, and fixes, plus how to verify correct behaviour.
When Elm reorders or deletes a list row, the runtime diffs positionally, shifting focus and typed input to the wrong row. Using Html.Keyed with stable data-derived keys preserves DOM node identity, keeping input state anchored to the logical item.