Detect Caps Lock with JavaScript

Anyone is capable of having their caps lock key on at any given time without realizing so. Users can easily spot unwanted caps lock when typing in most inputs, but when using a password input, the problem isn’t so obvious. That leads to the user’s password being incorrect, which is an annoyance. Ideally developers could let the user know their caps lock key is activated. To detect if a user has th

[kkeisuke]

“getModifierState”

[jay-es]

キーボードイベントの getModifierState メソッドを使うことで CapsLock などの状態を検知できる