Processing an ajax form using jQuery

js-ajax_form_submission.js

$('form').submit(function(e) {
  
  // get the form data
  formData = $(this).serialize();
  formData += '&action=submit_contact_form';
  
  // process the form
  $.ajax({
    type : 'post',
    url : localData.ajax_url,
    data : formData,
    dataType : 'json'
  }).done(function(data) {
    // use the data
    console.log(data);
  });
  
  // Prevent the default click action
  e.preventDefault();
});