Отображение курсора в поле телефона

var phoneInput = document.querySelector("#phone-mask"); 
phoneInput.addEventListener("keydown", function(e) { 
  "ArrowLeft" != e.key && "ArrowRight" != e.key && "Backspace" != e.key && "Tab" != e.key && e.preventDefault(); 
  var t = "+375 (111) 111-11-11"; 
  if (/[0-9\+\ \-\(\)]/.test(e.key)) { 
    var a = this.value, 
      n = a.length; 
    if (/[0-9]/.test(e.key)) 
      if ("1" == t[n]) this.value = a + e.key; 
      else 
        for (var r = n; r < t.length; r++) { 
          if ("1" == t[r]) { 
            this.value = a + e.key; 
            break 
          } 
          a += t[r] 
        } 
  } 
});

<input placeholder="+375 (XXX) XXX-XX-XX" id="phone-mask" type="text">