simple-keyboard/demo/main.js

const Keyboard = window.SimpleKeyboard.default;

const keyboard = new Keyboard({
  onChange: input => onChange(input),
  onKeyPress: button => onKeyPress(button)
});

/**
 * Update simple-keyboard when input is changed directly
 */
document.querySelector(".input").addEventListener("input", event => {
  keyboard.setInput(event.target.value);
});

console.log(keyboard);

function onChange(input) {
  document.querySelector(".input").value = input;
  console.log("Input changed", input);
}

function onKeyPress(button) {
  console.log("Button pressed", button);

  /**
   * If you want to handle the shift and caps lock buttons
   */
  if (button === "{shift}" || button === "{lock}") handleShift();
}

function handleShift() {
  const currentLayout = keyboard.options.layoutName;
  const shiftToggle = currentLayout === "default" ? "shift" : "default";

  keyboard.setOptions({
    layoutName: shiftToggle
  });
}