angular-telephone-filter
Version:
A simple filter to format of clean a US phone number.
107 lines (71 loc) • 2.32 kB
JavaScript
export function TelephoneFilter() {
return filter;
/**
* Clean or format a telephone number
*
* @param {String} number
* @param {String} method
* @return {String} finalNumber
*/
function filter(tel, method) {
const maxLength = 10;
const cityCodeLength = 3;
const numberLength = 7;
let longDistanceCode;
// Return if no number was passed in
if (!tel) {
return '';
}
// Strip all non-numeric characters
let value = tel.toString().trim().replace(/\D/g, '');
// Trim to verify the model doesn't get any larger
if (value.length > maxLength) {
// If the first character is a US country code
if (value.charAt(0) === '1') {
// Save the code
longDistanceCode = value.charAt(0);
// Don't strip it, allow 11 digits
value = value.substring(1, maxLength + 1);
} else {
value = value.substring(0, maxLength);
}
}
// Return if no method was passed in
if (!method) {
return 'A method{string} is required. e.g. \'clean\' or \'format\'';
}
//
// Clean a phone number
if (method === 'clean') {
return value;
}
//
// Format a phone number
if (method === 'format') {
let city;
let number;
switch (value.length) {
case 1:
case 2:
case 3:
city = value;
break;
default:
city = value.slice(0, cityCodeLength);
number = value.slice(cityCodeLength);
}
if (number) {
if (number.length > cityCodeLength) {
number = number.slice(0, cityCodeLength) + '-' +
number.slice(cityCodeLength, numberLength);
} else {
number = number;
}
return (longDistanceCode ? longDistanceCode + ' ' : '') +
('(' + city + ') ' + number).trim();
} else {
return '(' + city;
}
}
}
}