如何將類應用于下拉選單中單擊的元素？-有解無憂

在下面的代碼段中，我試圖顯示下拉選單，其中當前顯示的內容在串列項（活動類）下方帶有下劃線。如果單擊了另一個串列項，則將活動類移動到該單擊的元素。我已經完成了大部分作業，但我似乎無法在單擊時切換串列項。

如何在單擊的選單項之間切換活動類？

let dropdown = document.querySelector('.dropdown-select');
let dropdownItem = document.querySelectorAll('.dropdown-select .menu li');

dropdown.addEventListener('click', (e) => {
  if (dropdown.classList.contains('closed')) {
    dropdown.classList.remove('closed');
    dropdown.classList.add('open');
  } else {
    dropdown.classList.add('closed');
    dropdown.classList.remove('open');
  }
});

for (let i = 0; i < dropdownItem.length; i  ) {
  dropdownItem[i].addEventListener('click', function() {
    let dropdownItemClicked = document.querySelector('.menu li.active');
    if (dropdownItemClicked) dropdownItemClicked.classList.remove('active');
    this.parentNode.classList.add('active');
  })
}

const options = document.querySelectorAll('.menu li')

const results = document.querySelectorAll('.tabbed-content div')
options.forEach(e => e.addEventListener('click', function() {
  results.forEach(f => f.style.display = f.id == e.dataset.target ? "block" : "none")
}))

.dropdown-select {
  transition: all 0.2s ease;
  overflow: hidden;
  cursor: pointer;
  border-top: 1px solid #E0E5EC;
  padding-bottom: 10px;
  width: 100%;
}
@media (min-width: 768px) {
  .dropdown-select {
    display: flex;
    align-items: center;
    cursor: default;
  }
}
.dropdown-select.open {
  box-shadow: 0px 8px 24px rgba(0, 0, 0, 0.1);
}
@media (min-width: 768px) {
  .dropdown-select.open {
    box-shadow: unset;
  }
}
.dropdown-select__title {
  display: flex;
  align-items: center;
  padding-top: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid #E0E5EC;
}
.dropdown-select__title h6 {
  font-size: 0.75rem;
  line-height: 0.75rem;
  letter-spacing: 1px;
  text-transform: uppercase;
  pointer-events: none;
}
.dropdown-select__title img {
  width: 1.312rem;
  height: 0.656rem;
  margin-left: auto;
  transition: all 0.2s ease;
}
@media (min-width: 768px) {
  .dropdown-select__title img {
    display: none;
  }
}
.dropdown-select ul {
  margin: 0;
  padding: 0;
  list-style-type: none;
}
.dropdown-select .menu li {
  font-size: 1rem;
  line-height: 1.5rem;
  padding: 1rem 0;
  font-weight: 800;
  color: #6D7582;
}
@media (min-width: 768px) {
  .dropdown-select .menu li {
    padding: 0;
    cursor: pointer;
  }
  .dropdown-select .menu li:first-child {
    margin-right: 2rem;
  }
}
.dropdown-select .menu li.active {
  color: #005fec;
}
@media (min-width: 768px) {
  .dropdown-select .menu li.active {
    border-bottom: 4px solid #005fec;
  }
}
.dropdown-select__title,
.dropdown-select .menu {
  padding-left: 0.625rem;
  padding-right: 0.625rem;
}
@media (min-width: 768px) {
  .dropdown-select__title,
.dropdown-select .menu {
    display: flex;
    align-items: center;
    padding-left: 0;
    padding-right: 0;
    margin-right: 3.875rem;
  }
}
.dropdown-select.closed .menu {
  height: 0;
}
.dropdown-select.closed img {
  transform: rotate(180deg);
}

.tabbed-content div {
  display: none;
}

  <main>
    <div class="dropdown-select closed">
      <div class="dropdown-select__title">
        <h6>Other Releases</h6>
        <img src="https://cdn-icons-png.flaticon.com/24/25/25243.png" alt="down caret ">
      </div>
      <ul class="menu">
        <li data-target="1" class="active">Fall 2021</li>
        <li data-target="2">Summer 2021</li>
      </ul>
    </div>
    <div class="tabbed-content">
      <div id="1" style="display: block;">Fall 2021</div>
      <div id="2">Summer 2021</div>
    </div>
  </main>

uj5u.com熱心網友回復：

因此，要解決您的問題，您應該針對執行點擊事件的特定元素。并將active類添加到其中。如代碼片段所示。我只修改了這個事件監聽器來接收event然后將active類添加到target

dropdownItem[i].addEventListener('click', function(event) {
  let dropdownItemClicked = document.querySelector('.menu li.active');
  if (dropdownItemClicked) dropdownItemClicked.classList.remove('active');
  event.target.classList.add('active');
})

我相信這可以解決您的問題。

let dropdown = document.querySelector('.dropdown-select');
let dropdownItem = document.querySelectorAll('.dropdown-select .menu li');

dropdown.addEventListener('click', (e) => {
  if (dropdown.classList.contains('closed')) {
    dropdown.classList.remove('closed');
    dropdown.classList.add('open');
  } else {
    dropdown.classList.add('closed');
    dropdown.classList.remove('open');
  }
});

for (let i = 0; i < dropdownItem.length; i  ) {
  dropdownItem[i].addEventListener('click', function(event) {
    let dropdownItemClicked = document.querySelector('.menu li.active');
    if (dropdownItemClicked) dropdownItemClicked.classList.remove('active');
    event.target.classList.add('active');
  })
}

const options = document.querySelectorAll('.menu li')

const results = document.querySelectorAll('.tabbed-content div')
options.forEach(e => e.addEventListener('click', function() {
  results.forEach(f => f.style.display = f.id == e.dataset.target ? "block" : "none")
}))

.dropdown-select {
  transition: all 0.2s ease;
  overflow: hidden;
  cursor: pointer;
  border-top: 1px solid #E0E5EC;
  padding-bottom: 10px;
  width: 100%;
}
@media (min-width: 768px) {
  .dropdown-select {
    display: flex;
    align-items: center;
    cursor: default;
  }
}
.dropdown-select.open {
  box-shadow: 0px 8px 24px rgba(0, 0, 0, 0.1);
}
@media (min-width: 768px) {
  .dropdown-select.open {
    box-shadow: unset;
  }
}
.dropdown-select__title {
  display: flex;
  align-items: center;
  padding-top: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid #E0E5EC;
}
.dropdown-select__title h6 {
  font-size: 0.75rem;
  line-height: 0.75rem;
  letter-spacing: 1px;
  text-transform: uppercase;
  pointer-events: none;
}
.dropdown-select__title img {
  width: 1.312rem;
  height: 0.656rem;
  margin-left: auto;
  transition: all 0.2s ease;
}
@media (min-width: 768px) {
  .dropdown-select__title img {
    display: none;
  }
}
.dropdown-select ul {
  margin: 0;
  padding: 0;
  list-style-type: none;
}
.dropdown-select .menu li {
  font-size: 1rem;
  line-height: 1.5rem;
  padding: 1rem 0;
  font-weight: 800;
  color: #6D7582;
}
@media (min-width: 768px) {
  .dropdown-select .menu li {
    padding: 0;
    cursor: pointer;
  }
  .dropdown-select .menu li:first-child {
    margin-right: 2rem;
  }
}
.dropdown-select .menu li.active {
  color: #005fec;
}
@media (min-width: 768px) {
  .dropdown-select .menu li.active {
    border-bottom: 4px solid #005fec;
  }
}
.dropdown-select__title,
.dropdown-select .menu {
  padding-left: 0.625rem;
  padding-right: 0.625rem;
}
@media (min-width: 768px) {
  .dropdown-select__title,
.dropdown-select .menu {
    display: flex;
    align-items: center;
    padding-left: 0;
    padding-right: 0;
    margin-right: 3.875rem;
  }
}
.dropdown-select.closed .menu {
  height: 0;
}
.dropdown-select.closed img {
  transform: rotate(180deg);
}

.tabbed-content div {
  display: none;
}

  <main>
    <div class="dropdown-select closed">
      <div class="dropdown-select__title">
        <h6>Other Releases</h6>
        <img src="https://cdn-icons-png.flaticon.com/24/25/25243.png" alt="down caret ">
      </div>
      <ul class="menu">
        <li data-target="1" class="active">Fall 2021</li>
        <li data-target="2">Summer 2021</li>
      </ul>
    </div>
    <div class="tabbed-content">
      <div id="1" style="display: block;">Fall 2021</div>
      <div id="2">Summer 2021</div>
    </div>
  </main>

uj5u.com熱心網友回復：

你非常接近達到你所追求的效果。

如果我們查看下面的行，我們可以看到我們正在嘗試調整類。照原樣，我們成功洗掉了活動類，但無法在需要的地方添加它。這是因為該類試圖添加到錯誤的元素中，即父元素而不是兄弟元素。

    if (dropdownItemClicked) dropdownItemClicked.classList.remove('active');
this.parentNode.classList.add('active');

通過更改一行，我們可以將類添加到正確的元素，如下所示。

        if (dropdownItemClicked) dropdownItemClicked.classList.remove('active');
    dropdownItem[i].classList.add('active');

let dropdown = document.querySelector('.dropdown-select');
let dropdownItem = document.querySelectorAll('.dropdown-select .menu li');

dropdown.addEventListener('click', (e) => {
  if (dropdown.classList.contains('closed')) {
    dropdown.classList.remove('closed');
    dropdown.classList.add('open');
  } else {
    dropdown.classList.add('closed');
    dropdown.classList.remove('open');
  }
});

for (let i = 0; i < dropdownItem.length; i  ) {
  dropdownItem[i].addEventListener('click', function() {
    let dropdownItemClicked = document.querySelector('.menu li.active');
    if (dropdownItemClicked) dropdownItemClicked.classList.remove('active');
    dropdownItem[i].classList.add('active');
  })
}

const options = document.querySelectorAll('.menu li')

const results = document.querySelectorAll('.tabbed-content div')
options.forEach(e => e.addEventListener('click', function() {
  results.forEach(f => f.style.display = f.id == e.dataset.target ? "block" : "none")
}))

.dropdown-select {
  transition: all 0.2s ease;
  overflow: hidden;
  cursor: pointer;
  border-top: 1px solid #E0E5EC;
  padding-bottom: 10px;
  width: 100%;
}
@media (min-width: 768px) {
  .dropdown-select {
    display: flex;
    align-items: center;
    cursor: default;
  }
}
.dropdown-select.open {
  box-shadow: 0px 8px 24px rgba(0, 0, 0, 0.1);
}
@media (min-width: 768px) {
  .dropdown-select.open {
    box-shadow: unset;
  }
}
.dropdown-select__title {
  display: flex;
  align-items: center;
  padding-top: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid #E0E5EC;
}
.dropdown-select__title h6 {
  font-size: 0.75rem;
  line-height: 0.75rem;
  letter-spacing: 1px;
  text-transform: uppercase;
  pointer-events: none;
}
.dropdown-select__title img {
  width: 1.312rem;
  height: 0.656rem;
  margin-left: auto;
  transition: all 0.2s ease;
}
@media (min-width: 768px) {
  .dropdown-select__title img {
    display: none;
  }
}
.dropdown-select ul {
  margin: 0;
  padding: 0;
  list-style-type: none;
}
.dropdown-select .menu li {
  font-size: 1rem;
  line-height: 1.5rem;
  padding: 1rem 0;
  font-weight: 800;
  color: #6D7582;
}
@media (min-width: 768px) {
  .dropdown-select .menu li {
    padding: 0;
    cursor: pointer;
  }
  .dropdown-select .menu li:first-child {
    margin-right: 2rem;
  }
}
.dropdown-select .menu li.active {
  color: #005fec;
}
@media (min-width: 768px) {
  .dropdown-select .menu li.active {
    border-bottom: 4px solid #005fec;
  }
}
.dropdown-select__title,
.dropdown-select .menu {
  padding-left: 0.625rem;
  padding-right: 0.625rem;
}
@media (min-width: 768px) {
  .dropdown-select__title,
.dropdown-select .menu {
    display: flex;
    align-items: center;
    padding-left: 0;
    padding-right: 0;
    margin-right: 3.875rem;
  }
}
.dropdown-select.closed .menu {
  height: 0;
}
.dropdown-select.closed img {
  transform: rotate(180deg);
}

.tabbed-content div {
  display: none;
}

  <main>
    <div class="dropdown-select closed">
      <div class="dropdown-select__title">
        <h6>Other Releases</h6>
        <img src="https://cdn-icons-png.flaticon.com/24/25/25243.png" alt="down caret ">
      </div>
      <ul class="menu">
        <li data-target="1" class="active">Fall 2021</li>
        <li data-target="2">Summer 2021</li>
      </ul>
    </div>
    <div class="tabbed-content">
      <div id="1" style="display: block;">Fall 2021</div>
      <div id="2">Summer 2021</div>
    </div>
  </main>

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標籤：javascript css

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