function Change_Select_Ubication(parametro) {
  return new Promise((resolve, reject) => {
    $.ajax('https://httpbin.org/get')
    .then(() => {
      console.log(parametro);
      resolve(100);
    })
  });
};

Change_Select_Ubication('Primero')
.then(
  function () {
    Change_Select_Ubication('Segundo');
  }
);

{
  "args": {}, 
  "headers": {
    "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3", 
    "Accept-Encoding": "gzip, deflate, br", 
    "Accept-Language": "es-419,es;q=0.9", 
    "Host": "httpbin.org", 
    "Sec-Fetch-Mode": "navigate", 
    "Sec-Fetch-Site": "none", 
    "Upgrade-Insecure-Requests": "1", 
    "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36"
  }, 
  "origin": "181.224.191.126, 181.224.191.126", 
  "url": "https://httpbin.org/get"
}
 

            if($('input[name=input_email]').is(e.target))
            {
                alert('input_email');
            }
            else if($('input[name=input_password]').is(e.target))
            {
                alert('input_password');
            }
 

$newlines = substr_count($cadena, "\n");

<?php
$string = '• Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod.'."\r\n".'• Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod.'."\r\n".'• Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod.';
 
$newlines = substr_count($cadena, "\n");
echo nl2br($string);
echo 'Saltos de lineas: '.$newlines;
?>
 

        $('#id_form').on('change',function() // detecto si se produjo un cambio en el formulario entero
        {
            if(id_form.input_username.onchange) // quiero que si el cambio se produjo en el input username
            {
                alert('1');
            }
            else if(id_form.input_pass.onchange) // quiero que si el cambio se produjo en el input pass
            {
                alert('2');
            }
        });
 

$.when(Change_Select_Ubication('select_country')).then(function()
            {
                var select_province = document.getElementById('select_province');
                var op_province = select_province.getElementsByTagName('option');
                op_province[<?php echo($_POST['select_province']); ?>].selected = true;
 
                $.when(Change_Select_Ubication('select_province')).then(function()
                {
                    var select_municipality = document.getElementById('select_municipality');
                    var op_municipality = select_municipality.getElementsByTagName('option');
                    op_municipality[<?php echo($_POST['select_municipality']); ?>].selected = true;
 
                    $.when(Change_Select_Ubication('select_municipality')).then(function()
                    {
                        var select_city = document.getElementById('select_city');
                        var op_city = select_city.getElementsByTagName('option');
                        op_city[<?php echo($_POST['select_city']); ?>].selected = true;
                    });
                });
            });