International phone number

HTML and Javascript

<!-- International phone number with validation -->
	<div class="gnb-form-input">
	<label for="international-phone">International phone number</label>
	<select id="country" onchange="updateCountryCode()" style="max-width: fit-content;">
		<option value="AF">Afghanistan</option>
		<option value="AL">Albania</option>
		<option value="DZ">Algeria</option>
		<option value="AD">Andorra</option>
		<option value="AO">Angola</option>
		<option value="AI">Anguilla</option>
		<option value="AG">Antigua & Barbuda</option>
		<option value="AR">Argentina</option>
		<option value="AM">Armenia</option>
		<option value="AW">Aruba</option>
		<option value="AU">Australia</option>
		<option value="AT">Austria</option>
		<option value="AZ">Azerbaijan</option>
		<option value="BS">Bahamas</option>
		<option value="BH">Bahrain</option>
		<option value="BD">Bangladesh</option>
		<option value="BB">Barbados</option>
		<option value="BY">Belarus</option>
		<option value="BE">Belgium</option>
		<option value="BZ">Belize</option>
		<option value="BJ">Benin</option>
		<option value="BM">Bermuda</option>
		<option value="BT">Bhutan</option>
		<option value="BO">Bolivia</option>
		<option value="BA">Bosnia & Herzegovina</option>
		<option value="BW">Botswana</option>
		<option value="BR">Brazil</option>
		<option value="IO">British Indian Ocean Territory</option>
		<option value="VG">British Virgin Islands</option>
		<option value="BN">Brunei</option>
		<option value="BG">Bulgaria</option>
		<option value="BF">Burkina Faso</option>
		<option value="BI">Burundi</option>
		<option value="KH">Cambodia</option>
		<option value="CM">Cameroon</option>
		<option value="CA" selected>Canada</option>
		<option value="CV">Cape Verde</option>
		<option value="KY">Cayman Islands</option>
		<option value="CF">Central African Republic</option>
		<option value="TD">Chad</option>
		<option value="CL">Chile</option>
		<option value="CN">China</option>
		<option value="CO">Colombia</option>
		<option value="KM">Comoros</option>
		<option value="CG">Congo - Brazzaville</option>
		<option value="CD">Congo - Kinshasa</option>
		<option value="CK">Cook Islands</option>
		<option value="CR">Costa Rica</option>
		<option value="CI">Côte d’Ivoire</option>
		<option value="HR">Croatia</option>
		<option value="CU">Cuba</option>
		<option value="CW">Curaçao</option>
		<option value="CY">Cyprus</option>
		<option value="CZ">Czechia</option>
		<option value="DK">Denmark</option>
		<option value="DJ">Djibouti</option>
		<option value="DM">Dominica</option>
		<option value="DO">Dominican Republic</option>
		<option value="EC">Ecuador</option>
		<option value="EG">Egypt</option>
		<option value="SV">El Salvador</option>
		<option value="GQ">Equatorial Guinea</option>
		<option value="ER">Eritrea</option>
		<option value="EE">Estonia</option>
		<option value="SZ">Eswatini</option>
		<option value="ET">Ethiopia</option>
		<option value="FK">Falkland Islands</option>
		<option value="FO">Faroe Islands</option>
		<option value="FJ">Fiji</option>
		<option value="FI">Finland</option>
		<option value="FR">France</option>
		<option value="GF">French Guiana</option>
		<option value="PF">French Polynesia</option>
		<option value="GA">Gabon</option>
		<option value="GM">Gambia</option>
		<option value="GE">Georgia</option>
		<option value="DE">Germany</option>
		<option value="GH">Ghana</option>
		<option value="GI">Gibraltar</option>
		<option value="GR">Greece</option>
		<option value="GL">Greenland</option>
		<option value="GD">Grenada</option>
		<option value="GP">Guadeloupe</option>
		<option value="GT">Guatemala</option>
		<option value="GG">Guernsey</option>
		<option value="GN">Guinea</option>
		<option value="GW">Guinea-Bissau</option>
		<option value="GY">Guyana</option>
		<option value="HT">Haiti</option>
		<option value="HN">Honduras</option>
		<option value="HK">Hong Kong SAR China</option>
		<option value="HU">Hungary</option>
		<option value="IS">Iceland</option>
		<option value="IN">India</option>
		<option value="ID">Indonesia</option>
		<option value="IR">Iran</option>
		<option value="IQ">Iraq</option>
		<option value="IE">Ireland</option>
		<option value="IM">Isle of Man</option>
		<option value="IL">Israel</option>
		<option value="IT">Italy</option>
		<option value="JM">Jamaica</option>
		<option value="JP">Japan</option>
		<option value="JE">Jersey</option>
		<option value="JO">Jordan</option>
		<option value="KZ">Kazakhstan</option>
		<option value="KE">Kenya</option>
		<option value="KI">Kiribati</option>
		<option value="XK">Kosovo</option>
		<option value="KW">Kuwait</option>
		<option value="KG">Kyrgyzstan</option>
		<option value="LA">Laos</option>
		<option value="LV">Latvia</option>
		<option value="LB">Lebanon</option>
		<option value="LS">Lesotho</option>
		<option value="LR">Liberia</option>
		<option value="LY">Libya</option>
		<option value="LI">Liechtenstein</option>
		<option value="LT">Lithuania</option>
		<option value="LU">Luxembourg</option>
		<option value="MO">Macao SAR China</option>
		<option value="MG">Madagascar</option>
		<option value="MW">Malawi</option>
		<option value="MY">Malaysia</option>
		<option value="MV">Maldives</option>
		<option value="ML">Mali</option>
		<option value="MT">Malta</option>
		<option value="MQ">Martinique</option>
		<option value="MR">Mauritania</option>
		<option value="MU">Mauritius</option>
		<option value="YT">Mayotte</option>
		<option value="MX">Mexico</option>
		<option value="MD">Moldova</option>
		<option value="MC">Monaco</option>
		<option value="MN">Mongolia</option>
		<option value="ME">Montenegro</option>
		<option value="MS">Montserrat</option>
		<option value="MA">Morocco</option>
		<option value="MZ">Mozambique</option>
		<option value="MM">Myanmar (Burma)</option>
		<option value="NA">Namibia</option>
		<option value="NR">Nauru</option>
		<option value="NP">Nepal</option>
		<option value="NL">Netherlands</option>
		<option value="NC">New Caledonia</option>
		<option value="NZ">New Zealand</option>
		<option value="NI">Nicaragua</option>
		<option value="NE">Niger</option>
		<option value="NG">Nigeria</option>
		<option value="NU">Niue</option>
		<option value="MK">North Macedonia</option>
		<option value="NO">Norway</option>
		<option value="OM">Oman</option>
		<option value="PK">Pakistan</option>
		<option value="PS">Palestinian Territories</option>
		<option value="PA">Panama</option>
		<option value="PG">Papua New Guinea</option>
		<option value="PY">Paraguay</option>
		<option value="PE">Peru</option>
		<option value="PH">Philippines</option>
		<option value="PN">Pitcairn Islands</option>
		<option value="PL">Poland</option>
		<option value="PT">Portugal</option>
		<option value="QA">Qatar</option>
		<option value="RE">Réunion</option>
		<option value="RO">Romania</option>
		<option value="RU">Russia</option>
		<option value="RW">Rwanda</option>
		<option value="WS">Samoa</option>
		<option value="SM">San Marino</option>
		<option value="ST">São Tomé & Príncipe</option>
		<option value="SA">Saudi Arabia</option>
		<option value="SN">Senegal</option>
		<option value="RS">Serbia</option>
		<option value="SC">Seychelles</option>
		<option value="SL">Sierra Leone</option>
		<option value="SG">Singapore</option>
		<option value="SX">Sint Maarten</option>
		<option value="SK">Slovakia</option>
		<option value="SI">Slovenia</option>
		<option value="SB">Solomon Islands</option>
		<option value="SO">Somalia</option>
		<option value="ZA">South Africa</option>
		<option value="KR">South Korea</option>
		<option value="SS">South Sudan</option>
		<option value="ES">Spain</option>
		<option value="LK">Sri Lanka</option>
		<option value="BL">St. Barthélemy</option>
		<option value="SH">St. Helena</option>
		<option value="KN">St. Kitts & Nevis</option>
		<option value="LC">St. Lucia</option>
		<option value="MF">St. Martin</option>
		<option value="PM">St. Pierre & Miquelon</option>
		<option value="VC">St. Vincent & Grenadines</option>
		<option value="SR">Suriname</option>
		<option value="SJ">Svalbard & Jan Mayen</option>
		<option value="SE">Sweden</option>
		<option value="CH">Switzerland</option>
		<option value="SY">Syria</option>
		<option value="TW">Taiwan</option>
		<option value="TJ">Tajikistan</option>
		<option value="TZ">Tanzania</option>
		<option value="TH">Thailand</option>
		<option value="TL">Timor-Leste</option>
		<option value="TG">Togo</option>
		<option value="TK">Tokelau</option>
		<option value="TO">Tonga</option>
		<option value="TT">Trinidad & Tobago</option>
		<option value="TN">Tunisia</option>
		<option value="TR">Turkey</option>
		<option value="TM">Turkmenistan</option>
		<option value="TC">Turks & Caicos Islands</option>
		<option value="TV">Tuvalu</option>
		<option value="UG">Uganda</option>
		<option value="UA">Ukraine</option>
		<option value="AE">United Arab Emirates</option>
		<option value="GB">United Kingdom</option>
		<option value="US">United States</option>
		<option value="UY">Uruguay</option>
		<option value="UZ">Uzbekistan</option>
		<option value="VU">Vanuatu</option>
		<option value="VA">Vatican City</option>
		<option value="VE">Venezuela</option>
		<option value="VN">Vietnam</option>
		<option value="WF">Wallis & Futuna</option>
		<option value="YE">Yemen</option>
		<option value="ZM">Zambia</option>
		<option value="ZW">Zimbabwe</option>
	</select>
	<input type="text" id="international-phone" placeholder="Enter phone number" style="max-width: 15em;">
	<div class="gnb-form-validation" id="international-phone-error" style="display: none;"></div>
</div>

<script src="https://cdnjs.cloudflare.com/ajax/libs/libphonenumber-js/1.10.60/libphonenumber-js.min.js" defer></script>
<script>
	// Define language-specific translations for the error message
	const langtranslations = {
		en: {
			internationalPhoneError: 'Your phone number is not the correct length, please try again.'
		},
		fr: {
			internationalPhoneError: 'Votre numéro de téléphone n’a pas la bonne longueur, veuillez réessayer.'
		},
	};

	window.onload = function () {
		updateCountryCode(); // Set default value for phone input
	};

	function updateCountryCode() {
		const countrySelect = document.getElementById('country');
		const countryCode = countrySelect.options[countrySelect.selectedIndex].value;
		const phoneNumberInput = document.getElementById('international-phone');
		phoneNumberInput.value = '+' + libphonenumber.getCountryCallingCode(countryCode);
	}

	function validateInternationalPhoneNumber() {

		// Function to detect current language
		function getCurrentLanguage() {
			const htmlLang = document.documentElement.lang;
			return htmlLang ? htmlLang.toLowerCase() : 'en'; // Default to English if lang attribute not specified
		}

		// Function to translate strings
		function translate(key) {
			const currentLanguage = getCurrentLanguage();
			const translation = langtranslations[currentLanguage][key];
			return translation || key; // Return original key if translation not found
		}

		const countrySelect = document.getElementById('country');
		const countryCode = countrySelect.options[countrySelect.selectedIndex].value;
		const phoneNumberInput = document.getElementById('international-phone');
		const phoneNumber = phoneNumberInput.value;

		// Parse the phone number using libphonenumber-js
		try {
			const phoneNumberObj = new libphonenumber.parsePhoneNumber(phoneNumber, countryCode);
			if (!phoneNumberObj.isValid()) {
				phoneNumberInput.parentElement.classList.add('error');
				phoneNumberInput.parentElement.classList.remove('valid');
				phoneNumberInput.setAttribute('aria-invalid', 'true');
				phoneNumberInput.setAttribute('aria-describedby', 'phone-error');
				document.getElementById('international-phone-error').innerText = translate('internationalPhoneError');
				document.getElementById('international-phone-error').style.display = 'block'; // Show error message
				return;
			}
		} catch (error) {
			phoneNumberInput.parentElement.classList.add('error');
			phoneNumberInput.parentElement.classList.remove('valid');
			phoneNumberInput.setAttribute('aria-invalid', 'true');
			phoneNumberInput.setAttribute('aria-describedby', 'phone-error');
			document.getElementById('international-phone-error').innerText = translate('internationalPhoneError');
			document.getElementById('international-phone-error').style.display = 'block'; // Show error message
			return;
		}
		phoneNumberInput.parentElement.classList.remove('error');
		phoneNumberInput.parentElement.classList.add('valid');
		phoneNumberInput.removeAttribute('aria-invalid');
		phoneNumberInput.removeAttribute('aria-describedby');
		document.getElementById('international-phone-error').innerText = ''; // Clear any previous error messages
		document.getElementById('international-phone-error').style.display = 'none'; // Show error message
	}
	// Show error message when input field loses focus
	document.getElementById('international-phone').addEventListener('blur', validateInternationalPhoneNumber);
</script>