引导程序选择选项在版本4.1.0中不起作用

Question

如我所愿，只要单击选择选项，下拉菜单就会加载图标

要求：BootStrap版本4.1.0需要实现同一段代码。到目前为止，只要单击选择下拉列表都不会出现。

实际输出：以下代码在BootStrap 3.3.4版中可以完美运行

$(document).ready(function() {
    // Initiate with custom caret icon
    $('select.selectpicker').selectpicker({
    caretIcon: 'glyphicon glyphicon-menu-down'
    });
});

body {
    margin: 2em;
}

pre {
    margin: 1em 0;
}

select.selectpicker {
    display: none;
    /* Prevent FOUC */
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css">

<script src="https://thdoan.github.io/bootstrap-select/js/bootstrap-select.js"></script>

<link rel="stylesheet" href="https://thdoan.github.io/bootstrap-select/css/bootstrap-select.css">

<h2>Select with Icons</h2>
<select title="Select your spell" class="selectpicker">
    <option>Select...</option>
    <option data-icon="glyphicon glyphicon-eye-open" data-subtext="petrification">Eye of Medusa</option>
    <option data-icon="glyphicon glyphicon-fire" data-subtext="area damage">Rain of Fire</option>
</select>

预期的输出：BootStrap版本4.1.0需要实现同一段代码

$(document).ready(function() {
    // Initiate with custom caret icon
    $('select.selectpicker').selectpicker({
    caretIcon: 'glyphicon glyphicon-menu-down'
    });
});

body {
    margin: 2em;
}

pre {
    margin: 1em 0;
}

select.selectpicker {
    display: none;
    /* Prevent FOUC */
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css">

<script src="https://thdoan.github.io/bootstrap-select/js/bootstrap-select.js"></script>

<link rel="stylesheet" href="https://thdoan.github.io/bootstrap-select/css/bootstrap-select.css">

<h2>Select with Icons</h2>
<select title="Select your spell" class="selectpicker">
    <option>Select...</option>
    <option data-icon="glyphicon glyphicon-eye-open" data-subtext="petrification">Eye of Medusa</option>
    <option data-icon="glyphicon glyphicon-fire" data-subtext="area damage">Rain of Fire</option>
</select>

Answer 1

1. 您未添加正确版本的bootstrap.js

2. 您没有添加popper.js

3. 您未添加正确版本的bootstrap-select.js

由于Bootstrap 4不支持Glyphicon，因此您需要找到其他方法。

$(document).ready(function() {
    // Initiate with custom caret icon
    $('select.selectpicker').selectpicker({
    caretIcon: 'glyphicon glyphicon-menu-down'
    });
});

body {
    margin: 2em;
}

pre {
    margin: 1em 0;
}

select.selectpicker {
    display: none;
    /* Prevent FOUC */
}

<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>


<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">



<!-- Latest compiled and minified CSS -->
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap-select@1.13.7/dist/css/bootstrap-select.min.css">

<!-- Latest compiled and minified JavaScript -->
<script src="https://cdn.jsdelivr.net/npm/bootstrap-select@1.13.7/dist/js/bootstrap-select.min.js"></script>




<h2>Select with Icons</h2>
<select title="Select your spell" class="selectpicker">
    <option>Select...</option>
    <option data-icon="glyphicon glyphicon-eye-open" data-subtext="petrification">Eye of Medusa</option>
    <option data-icon="glyphicon glyphicon-fire" data-subtext="area damage">Rain of Fire</option>
</select>