如何将类添加到动态创建的DOM元素或类中

Question

类category2、category3、category4等是动态创建的。我想添加和删除一些名为active的类，比如class="category2 active"。

下面是我尝试将.active类添加到动态创建的类.active中的代码，但它不起作用：

​

if (count == 1) {
  $('.dynamic-class' + count).removeClass('active');
  $('.dynamic-class' + 2).addClass('active');
}
if (count == 2) {
  $('.dynamic-class' + count).removeClass('active');
  $('.dynamic-class' + 1).addClass('active');
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="film_listing live_tv">
  <div class="col-sm-2"><img id="11665" class="dynamic-class1" src="images/movies/flowerstv.jpg"></div>
  <div class="col-sm-2"><img id="11666" class="dynamic-class2" src="images/movies/flowerstv.jpg"></div>
</div>

​

Answer 1

在按类名进行选择时，您丢失了.。试着在下面：

if (count == 1) {
    $('.dynamic-class' + count).removeClass('active');
    count++;
    $('.dynamic-class' + count).addClass('active');
}
if (count == 2) {
    $('.dynamic-class' + count).removeClass('active');
    count--;
    $('.dynamic-class' + count).addClass('active');
}