Detect Caps Lock with JavaScript

Anyone is capable of having their caps lock key on at any given time without reapzing 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.

为了发现用户有其关键机板封顶时,我们使用的是<条码>Key板Event sgetModifierState。 方法:

document.querySelector( input[type=password] ).addEventListener( keyup , function (keyboardEvent) {
    const capsLockOn = keyboardEvent.getModifierState( CapsLock );
    if (capsLockOn) {
        // Warn the user that their caps lock is on?
    }
});

我从未见过以前使用的<代码>getModifierState,因此我探讨了。 W3C 文件以发现其他有用价值:

dictionary EventModifierInit : UIEventInit {
  boolean ctrlKey = false;
  boolean shiftKey = false;
  boolean altKey = false;
  boolean metaKey = false;

  boolean modifierAltGraph = false;
  boolean modifierCapsLock = false;
  boolean modifierFn = false;
  boolean modifierFnLock = false;
  boolean modifierHyper = false;
  boolean modifierNumLock = false;
  boolean modifierScrollLock = false;
  boolean modifierSuper = false;
  boolean modifierSymbol = false;
  boolean modifierSymbolLock = false;
};

getModifier State提供了大量关于关键主题活动期间用户键盘的见解。 我很早就在我的职业生涯中了解了<条码>。