Javascript Bootstrap 4 多选下拉菜单
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/50895806/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Bootstrap 4 multiselect dropdown
提问by Kees de Jager
I read on many forums that the problem of select and multiselect has been resolved after the beta version of bootstrap 4.
我在很多论坛上看到，在 bootstrap 4 测试版之后，select 和 multiselect 的问题已经解决了。
Unfortunately I am unable to display the multiselect as in (bootstrap 3) in (bootstrap 4).
不幸的是，我无法在 ( bootstrap 4) 中显示 ( bootstrap 3) 中的多选。
Bootstrap 3 Snippet
Bootstrap 3 代码段
$('select').selectpicker();<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-select/1.8.1/css/bootstrap-select.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-select/1.8.1/js/bootstrap-select.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/js/bootstrap.min.js"></script>
<select class="selectpicker" multiple data-live-search="true">
<option>Mustard</option>
<option>Ketchup</option>
<option>Relish</option>
</select>Bootstrap 4 Snippet
Bootstrap 4 代码段
$('select').selectpicker();<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css">
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.bundle.min.js"></script>
<select class="selectpicker" multiple data-live-search="true">
<option>Mustard</option>
<option>Ketchup</option>
<option>Relish</option>
</select>回答by dippas
Because the bootstrap-selectis a bootstrap component and therefore you need to include it in your code as you did for your V3
因为bootstrap-select是一个 bootstrap 组件，因此您需要像在 V3 中所做的那样将其包含在代码中
NOTE:this component only works in boostrap-4since version 1.13.0
注意：此部分仅适用于自举-4从版本1.13.0
$('select').selectpicker();<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-select/1.13.1/css/bootstrap-select.css" />
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.bundle.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-select/1.13.1/js/bootstrap-select.min.js"></script>
<select class="selectpicker" multiple data-live-search="true">
<option>Mustard</option>
<option>Ketchup</option>
<option>Relish</option>
</select>