如何聚焦引导程序选择选择器

Question

我使用数据实时搜索作为可搜索选项。当我点击聚焦按钮时，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enter键时，t是选择框的焦点，但搜索选项不会显示。我附上了截图当我输入时，请给我显示正确选项和搜索选项的建议

Answer 1

focus()不工作，因为它转向了自定义的select非本机选择选项，顺便说一句，在selectpicker插件中有一种本机方法可以做到这一点，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>