如何在至少一個元素處于活動狀態時顯示按鈕，并在未選擇任何元素時隱藏它？-有解無憂

我在頁面上有二十個元素（輸入復選框）。單擊任何元素時，我需要一個物件（按鈕）出現。但是當沒有元素處于活動狀態時，物件需要消失。請幫助我做到這一點。我想了很久，但沒有找到解決辦法。為方便起見，這里是 HTML 代碼：

.submit-btn {
  opacity: 0;
  position: absolute;
  left: 50%;
  top: 75%;
  transform: translate(-50%, 0);
  width: 147px;
  height: 52px;
  background: #fff;
  border: 3px solid #21ebff;
  box-sizing: border-box;
  border-radius: 30px;
  cursor: pointer;
  background: linear-gradient(to right, #21ebff 0%, #21ebff 50%, #ffffff 50%, #ffffff 100%);
  background-size: 200% 100%;
  background-position: 100% 0;
  transition: background-position 0.5s;
  transition: all 0.3s ease-in-out;
}

.submit-btn:hover {
  background-position: 0 0;
}

.arrow {
  display: inline-flex;
  position: relative;
  width: 0;
  height: 20px;
  cursor: pointer;
  margin-top: 5px;
}

.active {
  opacity: 1;
}

.arrow:before,
.arrow:after {
  display: inline-flex;
  position: absolute;
  content: '';
}

.arrow:before {
  top: 8px;
  right: -50px;
  width: 40px;
  height: 3px;
  background-color: #21ebff;
  transition: all 0.6s;
}

.arrow:after {
  width: 15px;
  height: 15px;
  top: 2px;
  right: -51px;
  border-top: 3px solid #21ebff;
  border-right: 3px solid #21ebff;
  transform: rotate(45deg);
  transition: all 0.5s;
}

.submit-btn:hover .arrow:before {
  background-color: #fff;
}

.submit-btn:hover .arrow:after {
  border-top: 3px solid #fff;
  border-right: 3px solid #fff;
}

.decades-checkbox-list {
  position: absolute;
  top: 35%;
  left: 50%;
  transition: all 2s;
  display: flex;
  justify-content: space-around;
  flex-wrap: wrap;
}

.decades-checkbox-col {
  display: flex;
  flex-direction: column;
  margin: 0 40px;
}

.decades-checkbox-item {
  width: 300px;
  margin: 15px 0;
  display: flex;
  align-items: center;
  user-select: none;
}

.decades-checkbox-item {
  width: 300px;
  margin: 15px 0;
  display: flex;
  align-items: center;
  user-select: none;
}

.decades-checkbox-input:checked .decades-checkbox-span {
  border-color: #21ebff;
  box-shadow: 0px 0px 0px 15px #21ebff inset;
}

.decades-checkbox-input:checked .decades-checkbox-span::after {
  opacity: 1;
  transform: scale(1);
}

.decades-checkbox-label {
  padding-left: 40px;
  word-spacing: 3px;
  font-family: 'Marvel';
  font-size: 26px;
  color: #202020;
  position: absolute;
  z-index: 10;
  cursor: pointer;
}

.decades-checkbox-span {
  width: 25px;
  height: 25px;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  border-radius: 100px;
  background-color: #FFF;
  border: 3px solid #21ebff;
  box-shadow: 0px 0px 0px 0px #21ebff inset;
  transition: all 0.15s cubic-bezier(0, 1.05, 0.72, 1.07);
}

.decades-checkbox-span::after {
  content: '';
  width: 100%;
  height: 100%;
  opacity: 0;
  z-index: 4;
  position: absolute;
  transform: scale(0);
  background-size: 50%;
  background-image: url('https://s6.picofile.com/d/8392306668/bacc888c-bed7-41a9-bf24-f6ff0718f471/checkmark.svg');
  background-repeat: no-repeat;
  background-position: center;
  transition-delay: 0.2s !important;
  transition: all 0.25s cubic-bezier(0, 1.05, 0.72, 1.07);
}

<ul class="decades-checkbox-list">
  <div class="decades-checkbox-col">
    <li class="decades-checkbox-item">
      <input class="decades-checkbox-input" type="checkbox" id="decadesCboxInput-1" onclick="disableFunc()">
      <span class="decades-checkbox-span"></span>
      <label class="decades-checkbox-label" for="decadesCboxInput-1">The 1930s</label>
    </li>
    <li class="decades-checkbox-item">
      <input class="decades-checkbox-input" type="checkbox" id="decadesCboxInput-2" onclick="disableFunc()">
      <span class="decades-checkbox-span"></span>
      <label class="decades-checkbox-label" for="decadesCboxInput-2">The 1940s</label>
    </li>
    <li class="decades-checkbox-item">
      <input class="decades-checkbox-input" type="checkbox" id="decadesCboxInput-3" onclick="disableFunc()">
      <span class="decades-checkbox-span"></span>
      <label class="decades-checkbox-label" for="decadesCboxInput-3">The 1950s</label>
    </li>
    <li class="decades-checkbox-item">
      <input class="decades-checkbox-input" type="checkbox" id="decadesCboxInput-4" onclick="disableFunc()">
      <span class="decades-checkbox-span"></span>
      <label class="decades-checkbox-label" for="decadesCboxInput-4">The 1960s</label>
    </li>
    <li class="decades-checkbox-item">
      <input class="decades-checkbox-input" type="checkbox" id="decadesCboxInput-5" onclick="disableFunc()">
      <span class="decades-checkbox-span"></span>
      <label class="decades-checkbox-label" for="decadesCboxInput-5">The 1970s</label>
    </li>
  </div>
  <div class="decades-checkbox-col">
    <li class="decades-checkbox-item">
      <input class="decades-checkbox-input" type="checkbox" id="decadesCboxInput-6" onclick="disableFunc()">
      <span class="decades-checkbox-span"></span>
      <label class="decades-checkbox-label" for="decadesCboxInput-6">The 1980s</label>
    </li>
    <li class="decades-checkbox-item">
      <input class="decades-checkbox-input" type="checkbox" id="decadesCboxInput-7" onclick="disableFunc()">
      <span class="decades-checkbox-span"></span>
      <label class="decades-checkbox-label" for="decadesCboxInput-7">The 1990s</label>
    </li>
    <li class="decades-checkbox-item">
      <input class="decades-checkbox-input" type="checkbox" id="decadesCboxInput-8" onclick="disableFunc()">
      <span class="decades-checkbox-span"></span>
      <label class="decades-checkbox-label" for="decadesCboxInput-8">The 2000s</label>
    </li>
    <li class="decades-checkbox-item">
      <input class="decades-checkbox-input" type="checkbox" id="decadesCboxInput-9" onclick="disableFunc()">
      <span class="decades-checkbox-span"></span>
      <label class="decades-checkbox-label" for="decadesCboxInput-9">The 2010s</label>
    </li>
    <li class="decades-checkbox-item">
      <input class="decades-checkbox-input" type="checkbox" id="decadesCboxInput-10" onclick="disableFunc()">
      <span class="decades-checkbox-span"></span>
      <label class="decades-checkbox-label" for="decadesCboxInput-10">The 2020s</label>
    </li>
  </div>
</ul>

uj5u.com熱心網友回復：

    function disableFunc(){
        ....
        if(document.querySelectorAll("input[type=checkbox]:checked").length===0){
            disableButton();
        }else{
            enableButton();
        }
    }

uj5u.com熱心網友回復：

請委托，然后您可以洗掉所有行內 disableFunc

我假設按鈕的 ID 為 buttonID

const container = document.querySelector(".decades-checkbox-list")
container.addEventListener("click", function(e) {
  document.getElementById("buttonID").hidden = container.querySelectorAll("input[type=checkbox]:checked").length===0
})

uj5u.com熱心網友回復：

您可以使用以下代碼：

if ($('input[type=checkbox]').is(":checked")) {
  //any one is checked (show button in your case)
}
else {
//hide button
}

uj5u.com熱心網友回復：

$('.decades-checkbox-list').on('click', '.decades-checkbox-item [type="checkbox"]', function(){  
    if($(this).is(":checked")){
        $('.btnSubmit').show();
    }else{
        $('.btnSubmit').hide();
    }
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<ul class="decades-checkbox-list">
                <div class="decades-checkbox-col">
                    <li class="decades-checkbox-item">
                        <input class="decades-checkbox-input" type="checkbox" id="decadesCboxInput-1">
                        <span class="decades-checkbox-span"></span>
                        <label class="decades-checkbox-label" for="decadesCboxInput-1">The 1930s</label>
                    </li>
                    <li class="decades-checkbox-item">
                        <input class="decades-checkbox-input" type="checkbox" id="decadesCboxInput-2">
                        <span class="decades-checkbox-span"></span>
                        <label class="decades-checkbox-label" for="decadesCboxInput-2">The 1940s</label>
                    </li>
                    <li class="decades-checkbox-item">
                        <input class="decades-checkbox-input" type="checkbox" id="decadesCboxInput-3">
                        <span class="decades-checkbox-span"></span>
                        <label class="decades-checkbox-label" for="decadesCboxInput-3">The 1950s</label>
                    </li>
                    <li class="decades-checkbox-item">
                        <input class="decades-checkbox-input" type="checkbox" id="decadesCboxInput-4">
                        <span class="decades-checkbox-span"></span>
                        <label class="decades-checkbox-label" for="decadesCboxInput-4">The 1960s</label>
                    </li>
                    <li class="decades-checkbox-item">
                        <input class="decades-checkbox-input" type="checkbox" id="decadesCboxInput-5">
                        <span class="decades-checkbox-span"></span>
                        <label class="decades-checkbox-label" for="decadesCboxInput-5">The 1970s</label>
                    </li>
                </div>
                <div class="decades-checkbox-col">
                    <li class="decades-checkbox-item">
                        <input class="decades-checkbox-input" type="checkbox" id="decadesCboxInput-6">
                        <span class="decades-checkbox-span"></span>
                        <label class="decades-checkbox-label" for="decadesCboxInput-6">The 1980s</label>
                    </li>
                    <li class="decades-checkbox-item">
                        <input class="decades-checkbox-input" type="checkbox" id="decadesCboxInput-7">
                        <span class="decades-checkbox-span"></span>
                        <label class="decades-checkbox-label" for="decadesCboxInput-7">The 1990s</label>
                    </li>
                    <li class="decades-checkbox-item">
                        <input class="decades-checkbox-input" type="checkbox" id="decadesCboxInput-8">
                        <span class="decades-checkbox-span"></span>
                        <label class="decades-checkbox-label" for="decadesCboxInput-8">The 2000s</label>
                    </li>
                    <li class="decades-checkbox-item">
                        <input class="decades-checkbox-input" type="checkbox" id="decadesCboxInput-9">
                        <span class="decades-checkbox-span"></span>
                        <label class="decades-checkbox-label" for="decadesCboxInput-9">The 2010s</label>
                    </li>
                    <li class="decades-checkbox-item">
                        <input class="decades-checkbox-input" type="checkbox" id="decadesCboxInput-10">
                        <span class="decades-checkbox-span"></span>
                        <label class="decades-checkbox-label" for="decadesCboxInput-10">The 2020s</label>
                    </li>
                </div>
              </ul>
              
              <input type="button" name="submit-btn" value="Submit" style="display: none" class="btnSubmit">

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標籤：javascript html css

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