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How to Add Keyboard Shortcut Events Easily in JavaScript 📌[All Method]️

Richard ParkerFebruary 8, 2022

2 minutes read

How to Add Keyboard Shortcut Events Easily in JavaScript 📌[All Method]️ — How to Add Keyboard Shortcut Events Easily in JavaScript All Method

Are you looking for an easy guide on How to Add Keyboard Shortcut Events Easily in JavaScript. By following this guide, you will be able to deal with these sorts of difficulties.
Question: What is the best way to approach this problem? Answer: Check out this blog code to learn how to fix errors How to Add Keyboard Shortcut Events Easily in JavaScript. Question:”What should you do if you run into code errors?” Answer:”By following this blog, you can find a solution.”

I was looking for an easy way to handle keyboard shortcuts in a web application I had been working on.

I wanted to register key presses like the following: ctrl+z, ctrl+shift+z, alt+x, m, etc.

While there are plenty of solid libraries out there for this (Mousetrap, HotKeys, etc.), I wanted to create my own shortcuts in vanilla JavaScript.

I decided to go with the keydown and keyup handlers in this scenario.

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document.addEventListener("keydown", handleKeyDown);
document.addEventListener("keyup", handleKeyUp);

I needed to handle ctrl, shift, and alt keyboard shortcuts, so naturally, I needed some sort of “state” for these three keys. For that, I created isPressed.

let isPressed = {
  ctrl: false,
  shift: false,
  alt: false,
};

I could then update isPressed on each keydown and keyup event.

Then, on each non-ctrl, non-shift, and non-alt key, I print out the resulting key press combination.

const getCode = (e) => {
  e = e || window.event;
  return e.key;
};
const handleKeyDown = (e) => {
  e.preventDefault();
  const key = getCode(e);
  switch (key) {
    case "Control":
      isPressed.ctrl = true;
      break;
    case "Shift":
      isPressed.shift = true;
      break;
    case "Alt":
      isPressed.alt = true;
      break;
    default:
      const { ctrl, shift, alt } = isPressed;
      let pressed = "";
      if (ctrl) pressed += "ctrl+";
      if (shift) pressed += "shift+";
      if (alt) pressed += "alt+";
      pressed += key;
      console.log(pressed);
      break;
  }
};
const handleKeyUp = (e) => {
  e.preventDefault();
  const key = getCode(e);
  switch (key) {
    case "Control":
      isPressed.ctrl = false;
      break;
    case "Shift":
      isPressed.shift = false;
      break;
    case "Alt":
      isPressed.alt = false;
      break;
  }
};

Revise the code and make it more robust with proper test case and check an error there before implementing into a production environment.
Now you can solve your code error in less than a minute.