How to check if a variable is empty in ajax form?

Question

AJAX

Hello. I use the following form to send messages via ajax. The form is taken from the public domain. Please tell me how can I check the msg variable for emptiness?

$('.email-form').submit(function (e) {
    e.preventDefault();
    var msg = $(this).serialize();
    $.ajax({
      type: 'POST',
      url: 'send.php',
      data: msg,
      success: function(data) {
        $('.results').html(data);
        window.setTimeout(function () {
           $('.results').hide();
           $('.modal').modal('hide');
        }, 5000);
      },
      error:  function(xhr, str){
        alert('Возникла ошибка: ' + xhr.responseCode);
      }
    });
  });

Answer 1

<...>
var msg = $(this).serialize();
if(!msg.name || !msg.email) return;
$.ajax({
<...>

upd: the problem is in serialize(), here you need to use
var msg = $(this).serializeArray();

Answer 2

in general you can do this:

<input id="name" name="name" />
<input id="email" name="email" />

$('.email-form').submit(function (e) {
    if ($("#name").val().length !== 0 && $("#email").val().length !== 0) {
    e.preventDefault();
    var msg = $(this).serialize();
    $.ajax({
      type: 'POST',
      url: 'send.php',
      data: msg,
      success: function(data) {
        $('.results').html(data);
        window.setTimeout(function () {
           $('.results').hide();
           $('.modal').modal('hide');
        }, 5000);
      },
      error:  function(xhr, str){
        alert('Возникла ошибка: ' + xhr.responseCode);
      }
    });
}
  });

Answer 3

if(msg)

Answer 4

dontforget.pro/javascript/primer-ajax-otpravki-for...
https://formden.com/blog/validate-contact-form-jquery
https://codepen.io/SitePoint/pen/akPoad
https:// codepen.io/Gix075/pen/ZYMBzO