Created
April 4, 2022 19:53
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Auto Format North American Phone Numbers in HTML Forms using Vanilla JS
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| document.addEventListener('DOMContentLoaded', function() { | |
| let tels = document.querySelectorAll('input[type=tel]'); | |
| tels.forEach(function (tel) { | |
| if (tel) { | |
| tel.addEventListener('change', function () { | |
| let inputField = this | |
| inputField.value = formatPhoneNumber(inputField.value); | |
| }); | |
| tel.addEventListener('keyup', function () { | |
| let inputField = this | |
| inputField.value = formatPhoneNumber(inputField.value); | |
| }); | |
| } | |
| }) | |
| }, false); | |
| window.formatPhoneNumber = function (value) { | |
| if (!value) return value; | |
| const phoneNumber = value.replace(/[^\d]/g, ''); | |
| const phoneNumberLength = phoneNumber.length; | |
| if (phoneNumberLength < 4) return phoneNumber; | |
| if (phoneNumberLength < 7) { | |
| return `(${phoneNumber.slice(0, 3)}) ${phoneNumber.slice(3)}`; | |
| } | |
| return `(${phoneNumber.slice(0, 3)}) ${phoneNumber.slice( | |
| 3, | |
| 6 | |
| )}-${phoneNumber.slice(6, 10)}`; | |
| } |
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