Длина элемента с классом hidden

// Button what add slide effect for product characteristics 
 
function hideButtonsMoreCharacteristicsIfWeHaveBitChatacteristics() { 
 
  $(".main-descript-tab__fullTab").each(function(index, el) { 
    // var heightField =; 
    var innerHeight = el.scrollHeight; 
    console.log($(".main-descript-tab").height() + " = heightField"); 
 
    if (((el.scrollHeight < $(".main-descript-tab").height()) && (el.scrollHeight !== 0))) { 
 
      // console.log(innerHeight + " = innerHeight"); 
      $(this).parent(".main-descript-tab").siblings(".main-desc__showMoreInfo").addClass("hidden"); 
      $(this).parent(".main-descript-tab").css("height", "auto"); 
    } 
 
  }); 
 
} 
hideButtonsMoreCharacteristicsIfWeHaveBitChatacteristics(); 
 
 
 
 
function switchMainDescription() { 
  var mainDescriptionItem = $(".main-desc-title__item"), 
    mainDescriptionContent = $(".main-desc__item"), 
    active = "active"; 
 
  mainDescriptionItem.on("click", function() { 
    mainDescriptionItem.removeClass(active); 
    $(this).addClass("active"); 
    var index = $('.main-desc-title__item.active').index(); 
 
    mainDescriptionContent.removeClass(active); 
    mainDescriptionContent.eq(index).addClass(active); 
 
    hideButtonsMoreCharacteristicsIfWeHaveBitChatacteristics(); 
 
  }); 
 
} 
switchMainDescription(); 
 
 
 
 
 
 
 
function showMoreCharacteristics() { // Slide effect 
 
  var buttonMoreInformation = $(".main-desc__showMoreInfo"), 
    fieldDescriptionActive = "main-descript-tab_active", 
    textShowInfo = ".main-desc__showMoreInfo_show", 
    textHideInfo = ".main-desc__showMoreInfo_hide"; 
 
  buttonMoreInformation.on("click", function() { 
 
    $(this).siblings(".main-descript-tab").toggleClass(fieldDescriptionActive); 
    $(this).children(textHideInfo).toggleClass("hidden"); 
    $(this).children(textShowInfo).toggleClass("hidden"); 
 
  }) 
} 
showMoreCharacteristics(); 
 
 
 
 
 
//   FORM Review 
 
var buttonAddComment = $(".code_addReview"), 
  formReview = $(".code_formRewiew"); 
 
buttonAddComment.on("click", function() { 
 
  $(this).hide(); 
  formReview.slideDown(600); 
 
});

ul { 
  list-style-type: none; 
} 
 
#form-review { 
  display: none; 
} 
 
.card-main-desc-wrap { 
  margin-bottom: 5px; 
} 
 
.min-title { 
  font-size: 24px; 
  font-weight: 600; 
} 
 
.product-line__title { 
  margin-bottom: 35px; 
} 
 
.products_related, 
.products_looked { 
  width: 100%; 
  margin: 0 16px; 
} 
 
.good-price { 
  display: inline-block; 
} 
 
.goods-item-slid .good-price__hist { 
  font-size: 14px; 
} 
 
.goods-item-slid .good-price__yy, 
.goods-item-slid .good-price__nom { 
  font-size: 16px; 
  -webkit-transform-origin: 100% 100%; 
  -ms-transform-origin: 100% 100%; 
  transform-origin: 100% 100%; 
} 
 
.goods-item-slid .good-price__hist { 
  margin-right: 10px; 
} 
 
.goods-item-slid .good-price__hist:before { 
  bottom: 0.35em; 
} 
 
.goods-item-slid__title { 
  overflow: hidden; 
  height: 32px; 
  margin-bottom: 12px; 
} 
 
.goods-item-slid__price { 
  margin-bottom: 12px; 
} 
 
.name-product { 
  font-size: 14px; 
  text-align: center; 
  line-height: 1.2; 
  display: block; 
} 
 
.main-page__product-line { 
  padding-bottom: 40px; 
} 
 
.goods-item-slid__img { 
  padding-bottom: 100%; 
  position: relative; 
  margin-bottom: 12px; 
} 
 
.goods-item-slid__pic { 
  position: absolute; 
  width: 100%; 
  height: 100%; 
  object-fit: cover; 
  left: 0; 
  top: 0; 
} 
 
.product-line__item { 
  margin-bottom: 35px; 
} 
 
.product-line__item:nth-last-of-type(1) { 
  margin-bottom: 0 !important; 
} 
 
#cart .dropdown-menu { 
  min-width: initial; 
} 
 
.list-group { 
  border: none; 
  box-shadow: none; 
} 
 
.list-group-item { 
  padding: 0; 
  border: none; 
  background-color: transparent; 
} 
 
.list-group a { 
  border: none; 
  padding: 0; 
} 
 
.list-group a:hover { 
  color: #ff4e54; 
  border: none; 
  background: none; 
  box-shadow: none; 
} 
 
.panel-default>.panel-heading { 
  background: none; 
  border: none; 
} 
 
.panel { 
  box-shadow: none; 
  background: none; 
  border: none; 
} 
 
.panel-default { 
  border: none; 
} 
 
.tab-desc { 
  display: none; 
} 
 
.tab-desc.active { 
  display: block; 
} 
 
.info-desc-text__item { 
  padding: 20px; 
} 
 
.descript-tab { 
  width: 100%; 
  min-height: 150px; 
  font-size: 14px; 
  line-height: 1.2; 
} 
 
.descript-tab>* { 
  margin-bottom: 20px; 
} 
 
.descript-tab>*:last-child { 
  margin: 0; 
} 
 
.main-desc-title { 
  display: -webkit-flex; 
  display: -ms-flexbox; 
  display: flex; 
  border-bottom: 2px solid #ff4e54; 
} 
 
.main-desc-title__item { 
  font-size: 20px; 
  width: 260px; 
  text-align: center; 
  padding: 12px; 
  background-color: #f4f4f4; 
  margin-right: 2px; 
  cursor: pointer; 
} 
 
.main-desc-title__item:last-child { 
  margin-right: 0; 
} 
 
.main-desc-title__item.active { 
  background-color: #ff4e54; 
  color: #fff; 
} 
 
.main-desc__item { 
  padding: 20px; 
} 
 
.main__card-product { 
  margin-bottom: 10px; 
} 
 
.main__card-product:after { 
  content: ''; 
  display: table; 
  clear: both; 
} 
 
.card-product__galery { 
  float: left; 
} 
 
.main-descript-tab { 
  position: relative; 
  display: block; 
  width: 100%; 
  height: 228px; 
  overflow: hidden; 
} 
 
.main-descript-tab_active { 
  height: auto !important; 
} 
 
.main-descript-tab p { 
  margin-top: 5px; 
  font-size: 16px; 
} 
 
.main-descript-tab li { 
  padding: 8px 30px 8px 40px; 
  display: -webkit-flex; 
  display: -ms-flexbox; 
  display: flex; 
  -webkit-align-items: center; 
  -ms-flex-align: center; 
  align-items: center; 
  font-size: 16px; 
} 
 
.main-descript-tab li:nth-child(odd) { 
  background-color: #f4f4f4; 
} 
 
.main-descript-tab li span { 
  -webkit-flex: 1; 
  -ms-flex: 1; 
  flex: 1; 
  max-width: 180px; 
  margin-right: 40px; 
} 
 
.main-descript-tab li span:last-child { 
  margin-right: 0; 
  max-width: 100%; 
} 
 
.main-desc__showMoreInfo { 
  display: block; 
  position: relative; 
  width: 260px; 
  margin-top: 6px; 
  padding: 10px 10px 10px 30px; 
  color: #fff; 
  background-color: #ff4e54; 
} 
 
.main-desc__showMoreInfo_show { 
  margin-left: -18px; 
} 
 
.main-desc__showMoreInfo_show:after { 
  position: absolute; 
  top: 10px; 
  right: 6px; 
  content: "\f103"; 
  font-family: "FontAwesome"; 
  font-size: 15px; 
  color: inherit; 
} 
 
.main-desc__showMoreInfo_hide:after { 
  position: absolute; 
  top: 10px; 
  right: 10px; 
  content: "\f00d"; 
  font-family: "FontAwesome"; 
  font-size: 15px; 
  color: inherit; 
} 
 
.bl_review { 
  height: 100%; 
  margin-top: 10px; 
  margin-left: 10px; 
  border-left: 1px solid #ff4e54; 
} 
 
.review_item { 
  margin-top: 10px; 
  width: 100%; 
  padding: 10px; 
  box-sizing: border-box; 
  border-left: 1px solid #ff4e54; 
} 
 
.review_item__userName { 
  display: inline-block; 
  padding-bottom: 4px; 
  border-bottom: 2px solid #ff4e54; 
  font-family: TahomaBold, sans-serif; 
  color: #333; 
  font-size: 18px; 
} 
 
.review_item__time { 
  float: right; 
  display: inline-block; 
} 
 
.review_item__raiting { 
  margin-top: 10px; 
  text-decoration: underline; 
} 
 
.personal-form-review { 
  clear: both; 
  margin-top: 15px; 
} 
 
.review_item__fullReview { 
  margin-top: 10px; 
} 
 
.review_product { 
  width: 100%; 
  margin: 24px auto; 
  text-align: center; 
} 
 
.review_product__title { 
  display: inline; 
  font-family: "Tahoma", sans-serif; 
  font-size: 24px; 
} 
 
.review_product__title__bold { 
  font-family: TahomaBold, sans-serif; 
} 
 
.bl_raiting__chackbox { 
  position: absolute; 
  visibility: hidden; 
} 
 
.my_button-review { 
  clear: both; 
  margin-top: 10px; 
  padding: 10px; 
  border-radius: 4px; 
  color: #fff; 
  background-color: #ff4e54; 
} 
 
.my_button-review:hover { 
  color: #fff; 
  text-decoration: underline; 
} 
 
.main-desc__showMoreInfo { 
  display: block; 
  position: relative; 
  width: 260px; 
  margin-top: 6px; 
  padding: 10px 10px 10px 30px; 
  color: #fff; 
  background-color: #ff4e54; 
} 
 
.main-desc__showMoreInfo_show { 
  margin-left: -18px; 
} 
 
.main-desc__showMoreInfo_show:after { 
  position: absolute; 
  top: 10px; 
  right: 6px; 
  content: "\f103"; 
  font-family: "FontAwesome"; 
  font-size: 15px; 
  color: inherit; 
} 
 
.main-desc__showMoreInfo_hide:after { 
  position: absolute; 
  top: 10px; 
  right: 10px; 
  content: "\f00d"; 
  font-family: "FontAwesome"; 
  font-size: 15px; 
  color: inherit; 
}

<link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet" /> 
<link href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet" /> 
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> 
 
 
<div class="card-main-desc-wrap"> 
  <div class="main-desc  tab-wrap"> 
    <ul class="main-desc-title"> 
      <li class="main-desc-title__item  tab-title  "> 
        Описание 
      </li> 
 
      <li class="main-desc-title__item  tab-title active"> 
        Характеристики 
      </li> 
 
      <li class="main-desc-title__item  tab-title "> 
        Отзывы 
      </li> 
    </ul> 
 
    <div class="main-desc-text"> 
      <div class="main-desc__item  tab-desc "> 
        <div class="wrapperBlock"> 
          <div class="main-descript-tab "> 
            <div class="main-descript-tab__fullTab"> 
 
 
              <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Inventore, quia?</p> 
              <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Inventore, quia? Lorem ipsum dolor sit amet.</p> 
              <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Inventore, quia? Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque doloribus illo impedit modi molestias, recusandae.</p> 
              <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Inventore, quia? Lorem ipsum dolor sit amet, consectetur adipisicing elit. Laboriosam, nulla?</p> 
 
            </div> 
          </div> 
 
          <button class="main-desc__showMoreInfo"> 
                                <span class="main-desc__showMoreInfo_show">Показать больше информации</span> 
                                <span class="main-desc__showMoreInfo_hide hidden">Скрыть информацию</span> 
                            </button> 
        </div> 
      </div> 
 
      <div class="main-desc__item  tab-desc active"> 
        <div class="wrapperBlock"> 
 
 
          <div class="main-descript-tab"> 
            <ul class="main-descript-tab__fullTab"> 
              <li> 
                <span>Страна производитель:</span> 
                <span>Украина</span> 
              </li> 
 
              <li> 
                <span>Материал</span> 
                <span>натуральная кожа</span> 
              </li> 
 
              <li> 
                <span>Код производителя:</span> 
                <span>170550-BM</span> 
              </li> 
 
 
            </ul> 
          </div> 
          <button class="main-desc__showMoreInfo"> 
                                <span class="main-desc__showMoreInfo_show">Показать больше информации</span> 
                                <span class="main-desc__showMoreInfo_hide hidden">Скрыть информацию</span> 
                            </button> 
        </div> 
      </div> 
 
      <div class="main-desc__item  tab-desc " id="tab-review"> 
 
 
        <div class="main-descript-tab"> 
          <div class="main-descript-tab__fullTab"> 
            <div id="review" class="hidden"> 
              <p>У данного товара пока нету отзывов, будь первым 
              </p> 
            </div> 
 
            <div class="review_item"> 
              <p class="review_item__userName">User Name</p> 
              <time class="review_item__time">01.08.2017</time> 
              <p class="review_item__raiting"><span>Рейтинг пользователя</span> 
                <span>4</span><span>/5</span></p> 
              <p class="review_item__fullReview"> 
                <span>Lorem ipsum dolor sit amet, consectetur adipisicing elit. A consectetur eos laborum magni quam quod ratione repudiandae suscipit tempora veniam! Aspernatur, atque corporis dignissimos minima nam officia provident quasi quia!</span> 
                <span>Alias, amet autem cum cumque delectus, deleniti dignissimos doloribus dolorum facilis illum incidunt iure iusto, laboriosam laborum maxime minus natus necessitatibus perspiciatis quaerat quis repellendus saepe sed similique suscipit unde!</span> 
              </p> 
            </div> 
 
          </div> 
        </div> 
 
        <button class="main-desc__showMoreInfo"> 
                                <span class="main-desc__showMoreInfo_show">Показать больше информации</span> 
                                <span class="main-desc__showMoreInfo_hide hidden">Скрыть информацию</span> 
                            </button> 
 
 
        <button class="my_button-review code_addReview"> 
                                <span class="button_review">Оставить отзыв о товаре</span> 
                                <i class="fa fa-bookmark" aria-hidden="true"></i> 
                            </button> 
 
 
 
        <form class="form-horizontal personal-form-review code_formRewiew" id="form-review"> 
 
          <div class="alert alert-danger"><i class="fa fa-exclamation-circle"></i> Пожалуйста, выберите оценку товара! 
          </div> 
          <div class="col-xs-12 review_product"> 
            <p class="review_product__title">Написать отзыв о</p> 
            <h2 class="review_product__title review_product__title__bold">Женская сумка Karfei 1710078-04A черная</h2> 
          </div> 
 
          <div class="form-group required review_form clearfix"> 
            <div class="col-sm-6"> 
              <input class="form-control review_name" type="text" name="name" value="" placeholder="*Ваше имя:"> 
            </div> 
            <div class="col-sm-6"> 
              <input class="form-control review_email" type="email" name="name" value="" placeholder="Email:"> 
            </div> 
            <div class="col-sm-6"> 
              <input class="form-control review_telephone" type="tel" name="name" value="" placeholder="Ваш телефон:"> 
            </div> 
 
            <div class="col-sm-6"> 
              <div class="bl_review__raiting"> 
                <span class="review_text">Оценить товар</span> 
 
                <div class="bl_review__raitingFull"> 
                  <input class="bl_raiting__chackbox" id="review_star5" type="radio" name="raiting" value="5"> 
                  <label class="bl_raiting__label" for="review_star5"></label> 
 
                  <input class="bl_raiting__chackbox" id="review_star4" type="radio" name="raiting" value="4"> 
                  <label class="bl_raiting__label" for="review_star4"></label> 
 
                  <input class="bl_raiting__chackbox" id="review_star3" type="radio" name="raiting" value="3"> 
                  <label class="bl_raiting__label" for="review_star3"></label> 
 
                  <input class="bl_raiting__chackbox" id="review_star2" type="radio" name="raiting" value="2"> 
                  <label class="bl_raiting__label" for="review_star2"></label> 
 
                  <input class="bl_raiting__chackbox" id="review_star1" type="radio" name="raiting" value="1"> 
                  <label class="bl_raiting__label" for="review_star1"></label> 
                </div> 
              </div> 
 
 
            </div> 
          </div> 
          <div class="form-group required"> 
            <div class="col-sm-12"> 
              <textarea class="form-control review_textarea" name="text" rows="5" id="input-review" placeholder="Текст сообщения"></textarea> 
            </div> 
          </div> 
 
          <button class="button_lim clearfix" type="button" id="button-review" data-loading-text="Загрузка..."> 
                                <span class="button_lim__text">Отправить</span> 
                            </button> 
 
        </form> 
      </div> 
    </div> 
  </div> 
</div>