CodePen - Phone number input field

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<div class="pn-select" id="js_pn-select" style="--prefix-length: 2">
  <button class="pn-selected-prefix" aria-label="Select phonenumber prefix" id="js_trigger-dropdown" tabindex="1">
    <img class="pn-selected-prefix__flag" id="js_selected-flag" src="https://flagpedia.net/data/flags/icon/36x27/nl.png" />
    <svg class="pn-selected-prefix__icon" xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="#081626" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
      <polyline points="6 9 12 15 18 9" />
    </svg>
  </button>
  <div class="pn-input">
    <label class="pn-input__label">Phonenumber*</label>
    <div class="pn-input__container">
      <input class="pn-input__prefix" value="+31" type="text" name="phonenumber-prefix" id="js_number-prefix" tabindex="-1" />
      <input class="pn-input__phonenumber" id="js_input-phonenumber" type="tel" name="phonenumber" pattern="\d*" value="" placeholder=" " autocomplete="nope" required max="10" tabindex="0" />
      <small class="pn-input__error">
        This is not a valid phone number
      </small>
    </div>
  </div>
  <div class="pn-dropdown" id="js_dropdown">
    <div class="pn-search">
      <svg class="pn-search__icon" xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="#103155" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
        <circle cx="11" cy="11" r="8"></circle>
        <line x1="21" y1="21" x2="16.65" y2="16.65"></line>
      </svg>
      <input placeholder="Search for countries" class="pn-search__input search" type="search" id="js_search-input" autocomplete="nope" />
    </div>
    <ul class="pn-list list" id="js_list"></ul>
    <div class="pn-list-item pn-list-item--no-results" style="display: none" id="js_no-results-found">
      No results found
    </div>
  </div>
</div>

</body>
</html>

CSS

@import url("https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500&display=swap");
html {
  box-sizing: border-box;
  height: 100%;
  font-size: 16px;
}

*,
*:before,
*:after {
  box-sizing: inherit;
}

body {
  background: #efefef;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: "Inter", sans-serif;
  font-weight: 400;
  line-height: 1.5;
  padding: 0 1em;
  color: #081627;
}

input[type=search],
input[type=tel],
input[type=text] {
  font-size: 1rem;
  border: 0;
  font-family: inherit;
  outline: none;
  color: inherit;
  margin: 0;
  padding: 0;
  width: auto;
  max-width: 100%;
}
input[type=search]::-webkit-input-placeholder,
input[type=tel]::-webkit-input-placeholder,
input[type=text]::-webkit-input-placeholder {
  font-weight: 300;
  color: #6b7280;
}
input[type=search]::-moz-placeholder,
input[type=tel]::-moz-placeholder,
input[type=text]::-moz-placeholder {
  font-weight: 300;
  color: #6b7280;
}
input[type=search]:-ms-input-placeholder,
input[type=tel]:-ms-input-placeholder,
input[type=text]:-ms-input-placeholder {
  font-weight: 300;
  color: #6b7280;
}
input[type=search]:-moz-placeholder,
input[type=tel]:-moz-placeholder,
input[type=text]:-moz-placeholder {
  font-weight: 300;
  color: #6b7280;
}

:root {
  --border-radius: 0.75em;
  --border-color: #c3c3c3;
  --border-color-active: #0047a5;
  --dropdown-border-color: #eaeaec;
  --dropdown-trigger-background-color: #f3f5f9;
  --dropdown-trigger-hover-background-color: #e6eaf1;
  --input-error-color: #ff0000;
  --input-label-color: #85898f;
  --input-prefix-color: #656b73;
  --input-phonenumber-color: #081627;
  --list-item-hover-background: #f3f5f9;
}

.pn-select {
  position: relative;
  border-width: 1px;
  border-style: solid;
  border-color: var(--border-color);
  display: grid;
  grid-template-columns: 4.5em 1fr;
  border-radius: var(--border-radius);
  box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.1);
  transition: all 0.2s ease-out;
  max-width: 20em;
  width: 100%;
  z-index: 1;
}
.pn-select:focus, .pn-select:focus-within {
  border-color: var(--border-color-active);
  box-shadow: 0 0 2px 0 var(--border-color-active);
}

.pn-dropdown {
  background: #ffffff;
  border-radius: var(--border-radius);
  border-width: 1px;
  border-style: solid;
  border-color: var(--dropdown-border-color);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.135);
  opacity: 0;
  padding: 0 0.5em 0.5em;
  pointer-events: none;
  position: absolute;
  top: 140%;
  transform-origin: left top;
  transition: all 0.15s ease-out;
  width: 100%;
  visibility: hidden;
}
.pn-select--open .pn-dropdown {
  pointer-events: all;
  transform: none;
  opacity: 1;
  top: 120%;
  visibility: visible;
}

.pn-search {
  position: relative;
  display: flex;
  border-bottom-width: 1px;
  border-style: solid;
  border-color: var(--dropdown-border-color);
  margin-bottom: 0.5em;
}
.pn-search svg {
  display: block;
  height: 1.25rem;
  left: 0.5em;
  pointer-events: none;
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 1.25rem;
}
.pn-search input[type=search] {
  padding-left: 2.5rem;
  height: 3rem;
  width: 100%;
}
.pn-search input[type=search]::-webkit-search-decoration, .pn-search input[type=search]::-webkit-search-cancel-button, .pn-search input[type=search]::-webkit-search-results-button, .pn-search input[type=search]::-webkit-search-results-decoration {
  display: none;
}

.pn-list {
  margin-right: -0.5em;
  max-height: 10.5em;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: #ffffff #ffffff;
  position: relative;
}
.pn-list::-webkit-scrollbar {
  width: 10px;
}
.pn-list:hover {
  --scrollbar-background: #ffffff;
  --thumb-background: #c0c4ca;
  scrollbar-color: var(--thumb-background) var(--scrollbar-background);
}
.pn-list:hover::-webkit-scrollbar-track {
  background: var(--scrollbar-background);
}
.pn-list:hover::-webkit-scrollbar-thumb {
  background-color: var(--thumb-background);
  border-radius: 6px;
  border: 3px solid var(--scrollbar-background);
}
.pn-list--no-scroll {
  margin-right: 0;
}

.pn-selected-prefix {
  align-items: center;
  -webkit-appearance: none;
     -moz-appearance: none;
          appearance: none;
  background: var(--dropdown-trigger-background-color);
  border-radius: var(--border-radius) 0 0 var(--border-radius);
  border: 0;
  cursor: pointer;
  display: flex;
  justify-content: center;
  margin: 0;
  outline: none;
  padding: 0;
  transition: background 0.2s ease-out;
}
.pn-selected-prefix:hover, .pn-selected-prefix:focus {
  background: var(--dropdown-trigger-hover-background-color);
}
.pn-selected-prefix__flag {
  height: auto;
  width: 1.25rem;
}
.pn-selected-prefix__icon {
  display: block;
  height: 1.25rem;
  margin-left: 0.5em;
  margin-right: -0.25em;
  transition: all 0.15s ease-out;
  width: 1.25rem;
}
.pn-select--open .pn-selected-prefix__icon {
  transform: rotate(180deg);
}

.pn-input {
  background: #ffffff;
  border-radius: 0 var(--border-radius) var(--border-radius) 0;
  line-height: 1;
  overflow: hidden;
  padding: 0.5em 1em;
}
.pn-input__container {
  display: flex;
  flex-direction: row;
}
.pn-input__label {
  color: var(--input-label-color);
  font-size: 0.7rem;
  position: relative;
  top: -0.25em;
}
.pn-input__error {
  bottom: 0;
  color: var(--input-error-color);
  font-size: 0.785rem;
  left: 0;
  opacity: 0;
  pointer-events: none;
  position: absolute;
  transition: all 0.2s ease-out;
  z-index: -1;
}
.pn-input input[type=text] {
  background: transparent;
  position: absolute;
  color: var(--input-prefix-color);
  max-width: 3rem;
  pointer-events: none;
}
.pn-input input[type=tel] {
  color: var(--input-phonenumber-color);
  padding-left: calc(calc(var(--prefix-length) * 1ch) + 1.5ch);
  font-weight: 500;
}
.pn-input input[type=tel]:not(:-moz-placeholder-shown):invalid + .pn-input__error {
  opacity: 1;
  transform: translateY(175%);
}
.pn-input input[type=tel]:not(:-ms-input-placeholder):invalid + .pn-input__error {
  opacity: 1;
  transform: translateY(175%);
}
.pn-input input[type=tel]:not(:placeholder-shown):invalid + .pn-input__error {
  opacity: 1;
  transform: translateY(175%);
}

.pn-list-item {
  align-items: center;
  border-radius: 0.5em;
  display: flex;
  font-weight: 400;
  padding: 0.6em 0.75em;
  transition: background-color 0.2s ease-out;
  cursor: pointer;
  outline: none;
}
.pn-list-item__flag {
  width: 1.25em;
  height: auto;
  margin-right: 1em;
  display: block;
}
.pn-list-item__country {
  margin-right: 0.25em;
}
.pn-list-item:hover, .pn-list-item:focus {
  background-color: var(--list-item-hover-background);
}
.pn-list-item--selected {
  pointer-events: none;
  font-weight: 500;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23103155' stroke-width='2' stroke-linecap='round' stroke-linejoin='round' class='feather feather-check'%3E%3Cpolyline points='20 6 9 17 4 12'/%3E%3C/svg%3E");
  background-position: right 0.75em top 50%;
  background-repeat: no-repeat;
  background-size: 1.25rem;
  background-position: right 0.75em top 50%;
}
.pn-list-item--no-results {
  pointer-events: none;
}

.dribble-creds {
  bottom: 2em;
  font-size: 0.875rem;
  left: 0;
  position: fixed;
  right: 0;
  text-align: center;
}
.dribble-creds a {
  color: #ea4c89;
  text-decoration: underline;
}

JS

const selectContainer = document.getElementById("js_pn-select");
const countrySearchInput = document.getElementById("js_search-input");
const noResultListItem = document.getElementById("js_no-results-found");
const dropdownTrigger = document.getElementById("js_trigger-dropdown");
const phoneNumberInput = document.getElementById("js_input-phonenumber");
const dropdownContainer = document.getElementById("js_dropdown");
const selectedPrefix = document.getElementById("js_number-prefix");
const selectedFlag = document.getElementById("js_selected-flag");
const listContainer = document.getElementById("js_list");

let countryList;

const init = async countries => {
  const selectCountry = e => {
    const { flag, prefix } = e.target.closest("li").dataset;
    setNewSelected(prefix, flag);
    closeDropdown();
    addSelectedModifier(flag);
  };

// -------------- Update the 'Selected country flag' to reflect changes

// -------------- Removes and adds modifier to selected country

const addSelectedModifier = flag => {
    const previousSelected = document.getElementsByClassName(
    "pn-list-item--selected")[
    0];
    const newSelected = document.querySelectorAll(
    `.pn-list-item[data-flag=${flag}]`)[
    0];
    previousSelected.classList.remove("pn-list-item--selected");
    newSelected.classList.add("pn-list-item--selected");
  };

// -------------- Close dropdown

const closeDropdown = () => {
    selectContainer.classList.remove("pn-select--open");
    listContainer.scrollTop = 0;
    countrySearchInput.value = "";
    countryList.search();
    phoneNumberInput.focus();
    removeDropdownEvents();
  };

// -------------- Open dropdown

const openDropdown = () => {
    selectContainer.classList.add("pn-select--open");
    attatchDropdownEvents();
  };

// -------------- Dropdown event listeners

let countdown;

const closeOnMouseLeave = () => {
    // console.log("countdown activated");
    countdown = setTimeout(() => closeDropdown(), 2000);
  };

const clearTimeOut = () => clearTimeout(countdown);

const attatchDropdownEvents = () => {
    // console.log("Adding event listeners");
    dropdownContainer.addEventListener("mouseleave", closeOnMouseLeave);
    dropdownContainer.addEventListener("mouseenter", clearTimeOut);
  };

const removeDropdownEvents = () => {
    // console.log("Removing event listeners and countdown");
    clearTimeout(countdown);
    dropdownContainer.removeEventListener("mouseleave", closeOnMouseLeave);
    dropdownContainer.removeEventListener("mouseenter", clearTimeOut);
  };

// -------------- Close when clicked outside the dropdown

document.addEventListener("click", e => {
    if (
    e.target !== selectContainer &&
    !selectContainer.contains(e.target) &&
    selectContainer.classList.contains("pn-select--open"))
    {
      closeDropdown();
    }
  });

// -------------- Append generated listItems to list element

const createList = () =>
  new Promise((resolve, _) => {
    countries.forEach((country, index, countries) => {
      const { name, prefix, flag } = country;

const element = `<li class="pn-list-item ${
      flag === "nl" ? "pn-list-item--selected" : ""
      } js_pn-list-item" data-flag="${flag}" data-prefix="${prefix}" tabindex="0" role="button" aria-pressed="false">
          <img class="pn-list-item__flag" src="https://flagpedia.net/data/flags/icon/36x27/${flag}.png" />
          <span class="pn-list-item__country js_country-name">${name}</span>
          <span class="pn-list-item__prefix js_country-prefix">(+${prefix})</span>
        </li>`;

listContainer.innerHTML += element;

if (index === countries.length - 1) {
        resolve();
      }
    });
  });

// -------------- After all the listItems are created we loop over the items to attach the eventListeners

const attatchListItemEventListeners = () =>
  new Promise((resolve, _) => {
    const listItems = [...document.getElementsByClassName("js_pn-list-item")];

listItems.forEach((item, index, listItems) => {
      item.addEventListener("click", event => {
        selectCountry(event);
      });
      // Keydown event listener - https://dev.to/tylerjdev/when-role-button-is-not-enough-dac
      item.addEventListener("keydown", function (e) {
        const keyD = e.key !== undefined ? e.key : e.keyCode;
        if (
        keyD === "Enter" ||
        keyD === 13 ||
        ["Spacebar", " "].indexOf(keyD) >= 0 ||
        keyD === 32)
        {
          e.preventDefault();
          this.click();
        }
      });

if (index === listItems.length - 1) {
        resolve();
      }
    });
  });

// -------------- After all the listItems are created we initate list and it's listeners

const initiateList = () => {
    countryList = new List("js_pn-select", {
      valueNames: ["js_country-name", "js_country-prefix"] });

// Add 'updated' listener for search results
    countryList.on("updated", list => {
      if (list.matchingItems.length < 5)
      listContainer.classList.toggle("pn-list--no-scroll");

noResultListItem.style.display =
      list.matchingItems.length > 0 ? "none" : "block";
    });
  };

await createList();
  await attatchListItemEventListeners();
  initiateList();

dropdownTrigger.addEventListener("click", () => {
    const isOpen = selectContainer.classList.contains("pn-select--open");
    isOpen ? closeDropdown() : openDropdown();
  });
};

const countries = [
{
  name: "Austria",
  prefix: 43,
  flag: "at" },

{
  name: "Belgium",
  prefix: 32,
  flag: "be" },

{
  name: "Bulgaria",
  prefix: 359,
  flag: "bg" },

{
  name: "Croatia",
  prefix: 385,
  flag: "hr" },

{
  name: "Cyprus",
  prefix: 357,
  flag: "cy" },

{
  name: "Czech Republic",
  prefix: 420,
  flag: "cz" },

{
  name: "Denmark",
  prefix: 45,
  flag: "dk" },

{
  name: "Estonia",
  prefix: 372,
  flag: "ee" },

{
  name: "Finland",
  prefix: 358,
  flag: "fi" },

{
  name: "France",
  prefix: 33,
  flag: "fr" },

{
  name: "Germany",
  prefix: 49,
  flag: "de" },

{
  name: "Greece",
  prefix: 30,
  flag: "gr" },

{
  name: "Hungary",
  prefix: 36,
  flag: "hu" },

{
  name: "Iceland",
  prefix: 354,
  flag: "is" },

{
  name: "Republic of Ireland",
  prefix: 353,
  flag: "ie" },

{
  name: "Italy",
  prefix: 39,
  flag: "it" },

{
  name: "Latvia",
  prefix: 371,
  flag: "lv" },

{
  name: "Liechtenstein",
  prefix: 423,
  flag: "li" },

{
  name: "Lithuania",
  prefix: 370,
  flag: "lt" },

{
  name: "Luxembourg",
  prefix: 352,
  flag: "lu" },

{
  name: "Malta",
  prefix: 356,
  flag: "mt" },

{
  name: "Netherlands",
  prefix: 31,
  flag: "nl" },

{
  name: "Norway",
  prefix: 47,
  flag: "no" },

{
  name: "Poland",
  prefix: 48,
  flag: "pl" },

{
  name: "Portugal",
  prefix: 351,
  flag: "pt" },

{
  name: "Romania",
  prefix: 40,
  flag: "ro" },

{
  name: "Slovakia",
  prefix: 421,
  flag: "sk" },

{
  name: "Slovenia",
  prefix: 386,
  flag: "si" },

{
  name: "Spain",
  prefix: 34,
  flag: "es" },

{
  name: "Sweden",
  prefix: 46,
  flag: "se" }];

init(countries);

CodePen - Phone number input field

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