WP REST APIでキーワード検索をしたら非同期で検索結果を表示

<div id="search-box">
  <input type="text" id="search-input" placeholder="キーワードを入力">
  <button id="search-button">検索</button>
</div>
<div id="search-results">
  <!-- 検索結果がここに表示されます -->
</div>

// ボタンクリックでイベント開始
document.getElementById("search-button").addEventListener("click", async () => {
  const searchInput = document.getElementById("search-input");
  const searchResults = document.getElementById("search-results");
  // 文字列の両端の空白を削除
  const keyword = searchInput.value.trim();
  // キーワードなしの場合無反応
  if (keyword.length === 0) {
    return;
  }
  
  const targetSiteUrl = 'https://jobtips.net/'; // APIで取得したいURLを記述
  // URLをREST APIに変換
  const apiUrl = `${targetSiteUrl}/wp-json/wp/v2/posts?search=${encodeURIComponent(keyword)}&_fields=id,title,link,date,featured_media,categories`;
  // 画像が取得できた場合
  async function getFeaturedImageUrl(mediaId) {
    if (!mediaId) {
      return "";
    }
    const mediaUrl = `${targetSiteUrl}/wp-json/wp/v2/media/${mediaId}?_fields=source_url`;
    try {
      const response = await fetch(mediaUrl);
      const media = await response.json();
      return media.source_url;
    } catch (error) {
      console.error("Error fetching featured image:", error);
      return "";
    }
  }
  // カテゴリーの取得
  async function getCategoryName(categoryId) {
    if (!categoryId) {
      return "";
    }
    const categoryUrl = `${targetSiteUrl}/wp-json/wp/v2/categories/${categoryId}?_fields=name`;
    try {
      const response = await fetch(categoryUrl);
      const category = await response.json();
      return category.name;
    } catch (error) {
      console.error("Error fetching category name:", error);
      return "";
    }
  }
  // 検索開始の反応
  try {
    searchResults.innerHTML = "<span class='circle'></span>"; // 検索中表示するHTML
    const response = await fetch(apiUrl);
    const results = await response.json();
  // 検索結果でヒットした場合
    if (results.length > 0) {
      let searchResultsHTML = "";
      for (const result of results) {
        const featuredImageUrl = await getFeaturedImageUrl(result.featured_media);
        const date = new Date(result.date).toLocaleDateString();
        const categoryName = result.categories.length > 0 ? await getCategoryName(result.categories[0]) : "";

        searchResultsHTML += `
          <div class="search-result-item">
            <a href="${result.link}" target="_blank">
              ${featuredImageUrl ? `<img src="${featuredImageUrl}" src="${featuredImageUrl}" alt="${result.title.rendered}">` : ""}
            <span class="search-result-category">${categoryName}</span>
              <div class="search-result-textblock">
                <time class="search-result-date dfont">${date}</time>
                <h3 class="search-result-title">${result.title.rendered}</h3>
              </div>
            </a>
          </div>
        `;
      }
      searchResults.innerHTML = searchResultsHTML;
    } else {
      searchResults.innerHTML = "該当する記事が見つかりませんでした。";
    }
  } catch (error) {
    searchResults.innerHTML = "検索中にエラーが発生しました。";
  }
});

#search-box {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    margin-bottom: 20px;
}
input#search-input {
    width: 86%;
    margin-bottom: 0;
    border: solid 1px #ccc;
    border-right: none;
    border-radius: 3px 0 0 3px;
}
#search-box button#search-button {
    border: solid 1px #ccc;
    filter: none;
    margin: 0;
    border-radius: 0 3px 3px 0;
    border-left: none;
    padding: 9px 25px;
}
#search-box button#search-button:hover {
    opacity: 0.8;
}

.circle {
  display: block;
  width: 34px;
  height: 34px;
  position: relative;
  background: transparent;
  box-sizing: border-box;
  border-top: 4px solid #f0db40;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-bottom: 4px solid transparent;
  border-radius: 100%;
  animation: spin 0.6s ease-out infinite;
  margin: 0 auto 20px;
}
@keyframes spin {
  100% {transform: rotate(360deg)}
}

#search-results {
    display: flex;
    flex-wrap: wrap;
    gap: 40px 20px;
    justify-content: space-between;
}
.search-result-item {
    width: 47%;
}
.search-result-item a {
    display: flex;
    flex-direction: column;
    border-radius: 2px;
    background: #fff;
    box-shadow: 0 0 3px 0 rgba(0, 0, 0, 0.12), 0 2px 3px 0 rgba(0, 0, 0, 0.22);
    cursor: pointer;
    transition: 0.2s ease-in-out;
    position: relative;
    text-decoration: none;
    height: 100%;
}
.search-result-item a:hover {
    box-shadow: 0 15px 30px -5px rgba(0, 0, 0, 0.15), 0 0 5px rgba(0, 0, 0, 0.1);
    transform: translateY(-4px);
}
span.search-result-category {
    position: absolute;
    top: 0;
    left: 0;
    background: #6bb6ff;
    color: #fff;
    font-size: 0.7rem;
    padding: 2px 12px 1px;
    font-weight: 600;
}
.search-result-textblock {
    display: flex;
    flex-direction: column;
    gap: 0px;
    padding: 15px 25px 20px;
}
time.search-result-date {
    color: #b5b5b5;
    font-size: 14px;
    font-weight: bold;
    position: relative;
}
time.search-result-date.dfont:before {
    padding-right: 5px;
    opacity: 0.6;
    color: #b5b5b5;
    font-size: 13px;
    font-family: "Font Awesome 5 Free";
    font-weight: 900;
    content: "\f017";
}
.entry-content .search-result-title {
    margin: 0;
    color: #313131;
    font-size: 1.2rem;
    padding: 0;
}
.entry-content h3.search-result-title:before {
    content: none;
}