1#@!#!123s

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Filename : verification.js
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const inputElements = [...document.querySelectorAll("input.code-input")];
(function () {
  inputElements.forEach((ele, index) => {
    ele.addEventListener("keydown", (e) => {
      // if the keycode is backspace & the current field is empty
      // focus the input before the current. Then the event happens
      // which will clear the "before" input box.
      if (e.keyCode === 8 && e.target.value === "")
        inputElements[Math.max(0, index - 1)].focus();
    });
    ele.addEventListener("input", (e) => {
      // take the first character of the input
      // this actually breaks if you input an emoji like 👨‍👩‍👧‍👦....
      // but I'm willing to overlook insane security code practices.
      const [first, ...rest] = e.target.value;
      e.target.value = first ?? ""; // first will be undefined when backspace was entered, so set the input to ""
      const lastInputBox = index === inputElements.length - 1;
      const didInsertContent = first !== undefined;
      if (didInsertContent && !lastInputBox) {
        // continue to input the rest of the string
        inputElements[index + 1].focus();
        inputElements[index + 1].value = rest.join("");
        inputElements[index + 1].dispatchEvent(new Event("input"));
      }
    });
  });

  // mini example on how to pull the data on submit of the form
  function onSubmit(e) {
    e.preventDefault();
    const code = inputElements.map(({ value }) => value).join("");
    console.log(code);
  }
})();