Precise Validation (dangerous)

DANGER: Various countries around the world update their number rules every month, so isValidNumberPrecise will start rejecting valid numbers unless you constantly keep it up-to-date e.g. via an automated script. For this reason, we strongly recommend sticking to the standard validation method which is much more stable as it only checks number length rules, which rarely change.

isValidNumberPrecise respects the validationNumberTypes option, which is set to ["MOBILE"] by default, meaning it will only return true for mobile numbers.

If isValidNumberPrecise returns false, and you'd like more detail, you can then use the getValidationError method to get more information. This method returns an error code (integer), which you can then map to your own custom error message, as in the example below.

All validation methods require the utils script to be loaded (see the readme for instructions). The utils script contains a custom build of Google's libphonenumber library in JavaScript, which provides validation tools as well as formatting and placeholder number generation.

Markup

<input id="phone" type="tel">
<button class="button" id="btn" type="button">Validate</button>
<span id="valid-msg" class="hide">✓ Valid</span>
<span id="error-msg" class="hide"></span>

Code

const input = document.querySelector("#phone");
const button = document.querySelector("#btn");
const errorMsg = document.querySelector("#error-msg");
const validMsg = document.querySelector("#valid-msg");

// here, the index maps to the error code returned from getValidationError - see readme
const errorMap = ["Invalid number", "Invalid country code", "Too short", "Too long", "Invalid number"];

// initialise plugin
const iti = window.intlTelInput(input, {
  initialCountry: "us",
  loadUtils: () => import("/intl-tel-input/js/utils.js?1733756310855"),
});

const reset = () => {
  input.classList.remove("error");
  errorMsg.innerHTML = "";
  errorMsg.classList.add("hide");
  validMsg.classList.add("hide");
};

const showError = (msg) => {
  input.classList.add("error");
  errorMsg.innerHTML = msg;
  errorMsg.classList.remove("hide");
};

// on click button: validate
button.addEventListener('click', () => {
  reset();
  if (!input.value.trim()) {
    showError("Required");
  } else if (iti.isValidNumberPrecise()) {
    validMsg.classList.remove("hide");
  } else {
    const errorCode = iti.getValidationError();
    const msg = errorMap[errorCode] || "Invalid number";
    showError(msg);
  }
});

// on keyup / change flag: reset
input.addEventListener('change', reset);
input.addEventListener('keyup', reset);