javascript 如何过滤页面上的内容卡?

laawzig2  于 2023-05-21  发布在  Java
关注(0)|答案(2)|浏览(123)

我写了一个博客,有三个类别:(数字营销类别、提示和建议类别、加密货币类别)
我想做的是过滤它。
例如,如果我想看到所有的文章为数字营销类别,我会点击这个按钮,以显示所有的数字营销类别和隐藏其他类别。
下面是我的代码示例。问题是我的过滤器不工作。有什么问题吗?
我试图添加JavaScript使其工作,但仍然没有工作。有什么问题吗?

document.addEventListener("DOMContentLoaded", () => {
  "use strict";

  /**
   * Article Category Filter
   */
  const filterButtons = document.querySelectorAll('.blog-filters button');
  const articleCards = document.querySelectorAll('.article-card');

  filterButtons.forEach(button => {
    button.addEventListener('click', () => {
      const selectedCategory = button.getAttribute('data-category');

      articleCards.forEach(card => {
        const cardCategory = card.getAttribute('data-category');

        if (selectedCategory === 'all' || selectedCategory === cardCategory) {
          card.style.display = 'block';
        } else {
          card.style.display = 'none';
        }
      });
    });
  });
}); // this line added by community
<section id="blog" class="blog">
  <div class="row">
    <div class="col-md-8">
      <div class="posts-list">
        <div class="row">
          <div class="col-lg-6 col-md-6 d-md-flex article-card" data-category="digital-marketing-category">
            Blog Card
          </div>
          <!-- Article Card -->

          <div class="col-lg-6 col-md-6 d-md-flex article-card" data-category="tips-and-advice-category">
            Blog Card
          </div>
          <!-- Article Card -->

          <div class="col-lg-6 col-md-6 d-md-flex article-card" data-category="cryptocurrency-category">
            Blog Card
          </div>
          <!-- Article Card -->
        </div>
      </div>
    </div>

    <div class="col-md-4">
      <div class="sidebar">
        <h3 class="sidebar-title">Article Categories</h3>
        <div class="blog-filters">
          <button data-category="filter-all">All</button>
          <button data-category="digital-marketing-category">Digital Marketing</button>
          <button data-category="tips-and-advice-category">Tips & Advice</button>
          <button data-category="cryptocurrency-category">Cryptocurrency</button>
        </div>
      </div>
    </div>
  </div>
</section>
relj7zay

relj7zay1#

在代码中,您将“全部筛选”按钮的data-category属性定义为data-category="filter-all"。因此,当单击All按钮时,JavaScript代码中的selectedCategory变量将被设置为“filter-all”。
但是,在if语句中,文章是按类别过滤的,该语句与“all”进行比较,而“all”与“filter-all”不匹配,因此不会显示任何文章。
下面是你的修正代码:

if (selectedCategory === 'filter-all' || selectedCategory === cardCategory) {
  card.style.display = 'block';
} else {
  card.style.display = 'none';
}

此外,你提供的JS在最后缺少了一个});,不确定这是否只是你不小心遗漏了那一行:)

4jb9z9bj

4jb9z9bj2#

已经通过@Beau解决。
你在这里声明你的button filter-all<button data-category="filter-all">All</button>
所以在你的条件下,if (selectedCategory === 'all'是错误的,它应该是if (selectedCategory === 'filter-all',正如@Beau所说的。
我只是添加片段以防万一。

document.addEventListener("DOMContentLoaded", () => {
  "use strict";

  /**
   * Article Category Filter
   */
  const filterButtons = document.querySelectorAll('.blog-filters button');
  const articleCards = document.querySelectorAll('.article-card');

  filterButtons.forEach(button => {
    button.addEventListener('click', () => {
      const selectedCategory = button.getAttribute('data-category');

      articleCards.forEach(card => {
        const cardCategory = card.getAttribute('data-category');

selectedCategory === 'filter-all' || selectedCategory === cardCategory ? card.style.display = 'block' : card.style.display = 'none'

      });
    });
  });
}); // this line added by community
<section id="blog" class="blog">
  <div class="row">
    <div class="col-md-8">
      <div class="posts-list">
        <div class="row">
          <div class="col-lg-6 col-md-6 d-md-flex article-card" data-category="digital-marketing-category">
            Digital Marketing Category
          </div>
          <!-- Article Card -->

          <div class="col-lg-6 col-md-6 d-md-flex article-card" data-category="tips-and-advice-category">
            Tips and Advice Category
          </div>
          <!-- Article Card -->

          <div class="col-lg-6 col-md-6 d-md-flex article-card" data-category="cryptocurrency-category">
            Crypto Currency Category
          </div>
          <!-- Article Card -->
        </div>
      </div>
    </div>

    <div class="col-md-4">
      <div class="sidebar">
        <h3 class="sidebar-title">Article Categories</h3>
        <div class="blog-filters">
          <button data-category="filter-all">All</button>
          <button data-category="digital-marketing-category">Digital Marketing</button>
          <button data-category="tips-and-advice-category">Tips & Advice</button>
          <button data-category="cryptocurrency-category">Cryptocurrency</button>
        </div>
      </div>
    </div>
  </div>
</section>

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