如果沒有選擇任何內容，如何讓Bootstrap選擇正常高度？-有解無憂

我在我的頁面中使用如果沒有選擇任何內容，如何讓 Bootstrap 選擇正常高度？

這將是預期的結果：

如果沒有選擇任何內容，如何讓 Bootstrap 選擇正常高度？

我使用這個屬性使選擇看起來是空的：data-none-selected-text=""它實際上看起來是空的但太平了。

如果我洗掉該屬性，我會得到這個Nothing selected我不想要的占位符：

如果沒有選擇任何內容，如何讓 Bootstrap 選擇正常高度？

無論選擇與否，如何使設計保持一致并保持相同的尺寸？

body {
  background-color: lightblue !important;
}

<head>
  <!-- Bootstrap CSS -->
  <link href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-EVSTQN3/azprG1Anm3QDgpJLIm9Nao0Yz1ztcQTwFspd3yD65VohhpuuCOmLASjC" crossorigin="anonymous">
  <!-- Bootstrap Select CSS -->
  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap-select.min.css">
</head>

<body>
  <div class="container-fluid">
    <div class="row mt-3">
      <div class="col-sm">
        Project Manager <span style="color:red;">*</span>
      </div>

      <div class="col-sm">
        <select class="selectpicker show-tick w-100" data-none-selected-text="" multiple data-max-options="2" aria-label="Project Manager" required>
          <option value="Michal Jackson">Michael Jackson</option>
          <option value="Michael Jordan">Michael Jordan</option>
          <option value="Luke Skywalker">Luke Skywalker</option>
          <option value="Rafael Nadal">Rafael Nadal</option>
          <option value="Cristiano Ronaldo">Cristiano Ronaldo</option>
          <option value="Albert Einstein">Albert Einstein</option>
        </select>
      </div>
    </div>
  </div>

  <!-- Popper.js 5.0.2 JS -->
  <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/2.9.2/umd/popper.min.js"></script>
  <!-- Bootstrap 5.0.2 JS -->
  <script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.bundle.min.js" integrity="sha384-MrcW6ZMFYlzcLA8Nl NtUVF0sA7MsXsP1UyJoMp4YLEuNSfAP JcXn/tWtIaxVXM" crossorigin="anonymous"></script>
  <!-- jQuery CDN -->
  <script src="https://code.jquery.com/jquery-3.6.0.js" integrity="sha256-H K7U5CnXl1h5ywQfKtSj8PCmoN9aaq30gDh27Xc0jk=" crossorigin="anonymous"></script>
  <!-- Bootstrap Select JS BETA VERSION, UPDATE TO A STABLE VERSION COMPATIBLE WITH BS5 ONCE IT IS RELEASED-->
  <script src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-select/1.14.0-beta2/js/bootstrap-select.min.js"></script>
</body>

uj5u.com熱心網友回復：

您可以覆寫默認引導類并為此場景設定例外。

.dropdown-toggle {
   height: 50px;
 }

uj5u.com熱心網友回復：

如果您真的不想使用占位符文本，只需使用空白 HTML 空格 (  ) 作為data-none-selected-textorplaceholder屬性值。任何一種方法都會導致選擇框保持標準高度，其中沒有可見文本。

body {
  background-color: lightblue !important;
}

<head>
  <link href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-EVSTQN3/azprG1Anm3QDgpJLIm9Nao0Yz1ztcQTwFspd3yD65VohhpuuCOmLASjC" crossorigin="anonymous">
  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap-select.min.css">
</head>

<body>
  <div class="container-fluid">
    <div class="row mt-3">
      <div class="col-sm">
        Data Attribute Example <span style="color:red;">*</span>
      </div>

      <div class="col-sm">
        <select class="selectpicker show-tick w-100" data-none-selected-text="&nbsp;" multiple data-max-options="2" aria-label="Project Manager" required>
          <option value="Michal Jackson">Michael Jackson</option>
          <option value="Michael Jordan">Michael Jordan</option>
          <option value="Luke Skywalker">Luke Skywalker</option>
          <option value="Rafael Nadal">Rafael Nadal</option>
          <option value="Cristiano Ronaldo">Cristiano Ronaldo</option>
          <option value="Albert Einstein">Albert Einstein</option>
        </select>
      </div>
    </div>

    <div class="row mt-3">
      <div class="col-sm">
        Placeholder Example <span style="color:red;">*</span>
      </div>

      <div class="col-sm">
        <select class="selectpicker show-tick w-100" placeholder="&nbsp;" multiple data-max-options="2" aria-label="Project Manager" required>
          <option value="Michal Jackson">Michael Jackson</option>
          <option value="Michael Jordan">Michael Jordan</option>
          <option value="Luke Skywalker">Luke Skywalker</option>
          <option value="Rafael Nadal">Rafael Nadal</option>
          <option value="Cristiano Ronaldo">Cristiano Ronaldo</option>
          <option value="Albert Einstein">Albert Einstein</option>
        </select>
      </div>
    </div>
  </div>

  <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/2.9.2/umd/popper.min.js"></script>
  <script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.bundle.min.js" integrity="sha384-MrcW6ZMFYlzcLA8Nl NtUVF0sA7MsXsP1UyJoMp4YLEuNSfAP JcXn/tWtIaxVXM" crossorigin="anonymous"></script>
  <script src="https://code.jquery.com/jquery-3.6.0.js" integrity="sha256-H K7U5CnXl1h5ywQfKtSj8PCmoN9aaq30gDh27Xc0jk=" crossorigin="anonymous"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-select/1.14.0-beta2/js/bootstrap-select.min.js"></script>
</body>

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