https://aurora-pack.ru/local/templates/aurora/js/phone-mask.js?17852435471696

1(function () {
2  function format(digits) {
3    if (digits.length && (digits[0] === '7' || digits[0] === '8')) digits = digits.slice(1);
4    digits = digits.slice(0, 10);
5    var out = '+7';
6    if (digits.length > 0) out += ' ' + digits.slice(0, 3);
7    if (digits.length > 3) out += ' ' + digits.slice(3, 6);
8    if (digits.length > 6) out += ' ' + digits.slice(6, 8);
9    if (digits.length > 8) out += ' ' + digits.slice(8, 10);
10    return out;
11  }
12  function attach(el) {
13    if (el.dataset.phoneMasked) return;
14    el.dataset.phoneMasked = '1';
15    el.setAttribute('inputmode', 'tel');
16    el.setAttribute('autocomplete', 'tel');
17    if (!el.getAttribute('maxlength')) el.setAttribute('maxlength', '18');
18    if (!el.placeholder) el.placeholder = '+7 ___ ___ __ __';
19    el.addEventListener('focus', function () { if (!el.value) el.value = '+7 '; });
20    el.addEventListener('input', function () {
21      var digits = el.value.replace(/\D/g, '');
22      el.value = digits ? format(digits) : '';
23    });
24    el.addEventListener('blur', function () { if (el.value === '+7' || el.value === '+7 ') el.value = ''; });
25    el.addEventListener('keydown', function (e) {
26      if (e.key === 'Backspace' && el.value.replace(/\D/g, '').replace(/^7/, '').length === 0) el.value = '';
27    });
28    el.addEventListener('paste', function (e) {
29      e.preventDefault();
30      var text = (e.clipboardData || window.clipboardData).getData('text');
31      el.value = format(text.replace(/\D/g, ''));
32    });
33  }
34  function init() { document.querySelectorAll('input[type="tel"]').forEach(attach); }
35  if (document.readyState === 'loading') document.addEventListener('DOMContentLoaded', init);
36  else init();
37})();