JQuery toggleClass（）-如何仅切换目标文本

Question

我正在做作业，正在创建购物清单。每当我单击复选按钮时，购物商品都应切换到一个在文本中插入一行的类。我的代码起作用了，但是它切换了所有购物物品。有人可以提供一些指导吗？

注意：我无法更改HTML或CSS；严格来说，这是JavaScript设置。另外，我希望基本方向正确。我不是在寻找直接答案。最后，我刚刚开始该项目，所以我正在寻求有关此问题的帮助。预先感谢！

这里是页面的链接...

https://repl.it/@DustinVenable/ShoppingListAssignment

Answer 1

问题是您在所有元素上切换了类。 $(".shopping-item").toggleClass("shopping-item__checked");

您可以使用$(this).closest("li").find(".shopping-item").toggleClass("shopping-item__checked");，它将仅切换您单击的li的button中的元素。

demo

$(".shopping-item-delete").click(function() {
  $(this).parent().parent().remove();
})

//Check and Uncheck Shopping Items
$(".shopping-item-toggle").click(function() {
  $(this).closest("li").find(".shopping-item").toggleClass("shopping-item__checked");
});

* {
  box-sizing: border-box;
}

body {
  font-family: 'Roboto', sans-serif;
}

button,
input[type="text"] {
  padding: 5px;
}

button:hover {
  cursor: pointer;
}

#shopping-list-item {
  width: 250px;
}

.container {
  max-width: 600px;
  margin: 0 auto;
}

.shopping-list {
  list-style: none;
  padding-left: 0;
}

.shopping-list>li {
  margin-bottom: 20px;
  border: 1px solid grey;
  padding: 20px;
}

.shopping-item {
  display: block;
  color: grey;
  font-style: italic;
  font-size: 20px;
  margin-bottom: 15px;
}

.shopping-item__checked {
  text-decoration: line-through;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="container">
  <h1>Shopping List</h1>

  <form id="js-shopping-list-form">
    <label for="shopping-list-entry">Add an item</label>
    <input type="text" name="shopping-list-entry" id="shopping-list-entry" placeholder="e.g., broccoli">
    <button type="submit">Add item</button>
  </form>

  <ul class="shopping-list">
    <li>
      <span class="shopping-item">apples</span>
      <div class="shopping-item-controls">
        <button class="shopping-item-toggle">
            <span class="button-label">check</span>
          </button>
        <button class="shopping-item-delete">
            <span class="button-label">delete</span>
          </button>
      </div>
    </li>
    <li>
      <span class="shopping-item">oranges</span>
      <div class="shopping-item-controls">
        <button class="shopping-item-toggle">
            <span class="button-label">check</span>
          </button>
        <button class="shopping-item-delete">
            <span class="button-label">delete</span>
          </button>
      </div>
    </li>
    <li>
      <span class="shopping-item shopping-item__checked">milk</span>
      <div class="shopping-item-controls">
        <button class="shopping-item-toggle">
            <span class="button-label">check</span>
          </button>
        <button class="shopping-item-delete">
            <span class="button-label">delete</span>
          </button>
      </div>
    </li>
    <li>
      <span class="shopping-item">bread</span>
      <div class="shopping-item-controls">
        <button class="shopping-item-toggle">
            <span class="button-label">check</span>
          </button>
        <button class="shopping-item-delete">
            <span class="button-label">delete</span>
          </button>
      </div>
    </li>
  </ul>
</div>