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Dev.to
7/21/2026
Preventing Focus Loss From Launching a Charged Jump in a Three.js Arcade Game

Preventing Focus Loss From Launching a Charged Jump in a Three.js Arcade Game

Short summary

A Three.js arcade game bug caused automatic jumps when the browser lost focus during charge-up, because the blur event was treated as a deliberate input release. The fix separates the input lifecycle: pointerup and keyup still launch jumps, but blur, visibilitychange, and pointercancel now cancel the charge and return to aiming mode. The change is minimal (+18/-3 lines) and preserves the core charge-and-leap mechanic's timing and feel.

  • Bug: browser blur event during charge-up triggered unintended jumps in Three.js game
  • Fix: separate blur/visibilitychange/pointercancel (cancel charge) from pointerup/keyup (launch jump)
  • Minimal 18-line change preserves original gameplay feel while preventing accidental actions

Generated with AI, which can make mistakes.

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