What is this front end bullshit?

main.js

// Just to make life easier.
var common = {
  ajaxPut: function(url, body) {
    return $.ajax({
      url: url,
      type: 'PUT',
      dataType: 'json',
      data: body
    });
  },
};

// Form Snippet
<div class='col-sm-3'>
  <select id='device_parameter_set_id' class='form-control' required>
    <option value='0'>Device Parameter Set</option>
  </select>
</div>

// Append to options
common.ajaxGet('host/awesome/uri'))
  .always(function(resp) {
    $.each(JSON.parse(resp.responseText), function(key, value) {
      $("#device_parameter_set_id").append($('<option></option>').val(value.id).text(value.name));
  });
});

// Ajax 
$("#devicePut").on('submit', function(evt) {
  evt.preventDefault();
  common.ajaxPut('host/put/URI', {
    device_param: parseInt($("#device_parameter_set_id").val());
  })
    .done(function(resp, text, http) {
      if (resp) {
        alert(resp.responseText);
      } else {
        alert(text.status);
      }
    });
});