如何聚焦引导选择选择器

Question

我使用 data-live-search 作为可搜索选项。当我单击焦点按钮时，它应该再次聚焦选择。我使用了以下代码

$("#focus").click(function() {
  $(".selectpicker").focus();
});

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-select/1.12.1/css/bootstrap-select.css" />
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-select/1.12.1/js/bootstrap-select.js"></script>

<select data-live-search="true" data-live-search-style="startsWith" class="selectpicker">
  <option value="4444">4444</option>
  <option value="Fedex">Fedex</option>
  <option value="Elite">Elite</option>
  <option value="Interp">Interp</option>
  <option value="Test">Test</option>
</select>
<button id="focus">focus</button>

每当我按下回车键时，t 都是选择框的焦点，但不显示搜索选项。我已附上screenshot 请给我建议，让我在输入时显示带有搜索选项的正确选项

Answer 1

focus() 不起作用，因为它转向了自定义的select 而不是原生选择选项，顺便说一句，selectpicker 插件中有一个原生方式可以做到这一点，一个名为 toggle 的事件

$("#focus").click(function() {
  // toggle
  $('.selectpicker').selectpicker('toggle');

  // select by value
  $('.selectpicker').selectpicker('val', 'Test');
  $('.remove-example').selectpicker('refresh');

  // change highlight
  $('.dropdown-menu li').removeClass('active')
});

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-select/1.12.1/css/bootstrap-select.css" />
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-select/1.12.1/js/bootstrap-select.js"></script>

<select data-live-search="true" data-live-search-style="startsWith" class="selectpicker">
  <option value="4444">4444</option>
  <option value="Fedex">Fedex</option>
  <option value="Elite">Elite</option>
  <option value="Interp">Interp</option>
  <option value="Test">Test</option>
</select>
<button id="focus">focus</button>