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Bootstrap-select是一个基于bootstrap主题，jquery库的开源多选组件，官网地址：https://developer.snapappointments.com/bootstrap-select/，官网比较详细的介绍了bootstrap-select的上手指南、可选项配置、案例和api使用。既然官网已经有比较翔实的参考资料，为什么还多此一举写本文，主要有2点：
1）官网有点神经质，经常访问不了；
2）做个总结，便于以后查看。
1、快速上手
引入2个核心文件即可：
1）bootstrap-select.css或其压缩文件.min.css;
2）bootstrap-select.js或其压缩文件.min.js;
3）多语言要求的话，请再引入语言包js
除此之外，必要的jquery,bootstrap库也要引入，大家可以下载到本地，也可以使用cdn资源，本文使用的是bootcss cdn资源，具体参考文本提供的DEMO。
bootstrap-select使用很简单，通常就2种方式：
通过添加selectpicker类来实现，如下：
<select class="selectpicker">
<option>Mustard</option>
<option>Ketchup</option>
<option>Barbecue</option>
</select>
通过js代码显性初始化
$(function () {
$('.my-select').selectpicker(); // 初始化特定select
$('select').selectpicker(); // 初始化所有select
});
2、bootstrap-select常用选项列表
本文只列出常用的核心选项，其它更多选项大家参考：https://developer.snapappointments.com/bootstrap-select/options/
| Name | Type | Default | Description |
|---|---|---|---|
| actionsBox | boolean | false | 是否显示2个按钮: 选中全部和取消选中全部 (Select All & Deselect All). |
| deselectAllText | string | ‘Deselect All’ | 选中全部文本描述, actionsBox = true才生效. |
| selectAllText | string | ‘Select All’ | 选中全部文本描述, actionsBox = true才生效. |
| dropdownAlignRight | boolean or ‘auto’ | false | 下拉框对齐方式，默认左对齐，设为true则右对齐 |
| liveSearch | boolean | false | 是否出现搜索框，默认没有. |
| noneSelectedText | string | ‘Nothing selected’ | 多选模式下，没选中项显示文本 |
| noneResultsText | string | ‘No results matched {0}’ | 没找到匹配项显示文本. |
| maxOptions | integer or false | false | 多选模式下，最多选中项.如果设置到optgroup则表示该分组最多选中项 |
| maxOptionsText | string or array or function | function | 超出最多选中项的显示文本. |
| showTick | boolean | false | 选中项后面是否显示对勾√ |
| size | ‘auto’ integer false | ‘auto’ | 下拉列表显示几项，auto组件会根据可见区域高度自动调整，false则显示全部，intger数字则显示设置的数字项，多余下拉滚动. |
选项如何设置？
1）通过data-*来设置，如：actionsBox，可设置成data-actions-box，具体参考本文DEMO
<select class="selectpicker" multiple data-actions-box="true" data-deselect-all-text = '取消选中' data-select-all-text='选中全部'>
<option>Mustard</option>
<option>Ketchup</option>
<option>Relish</option>
</select>
2）通过js来初始化
$("#bs-select3").selectpicker({liveSearch: true, noneResultsText: "没找到相应记录{0}"});
3、bootstrap-select提供的常用api方法列表
1）.selectpicker(‘val’)， 取值和赋值
取值：.selectpicker(‘val’)
取值也可以通过$(selector).val()获取
赋值：.selectpicker(‘val’, 值)
$('.selectpicker').selectpicker('val', 'Mustard'); //单选赋值
$('.selectpicker').selectpicker('val', ['Mustard','Relish']); //多选赋值
2）.selectpicker(‘selectAll’)， 多选模式选中全部
$('.selectpicker').selectpicker('selectAll');
3）.selectpicker(‘deselectAll’)， 多选模式取消选中全部
$('.selectpicker').selectpicker('deselectAll');
4）.selectpicker(‘render’)，重新渲染
You can force a re-render of the bootstrap-select ui with the render method. This is useful if you programatically change any underlying values that affect the layout of the element.
$(’.selectpicker’).selectpicker(‘render’);
5）.selectpicker(‘refresh’)，刷新
当bs-select新增、移除option，修改option selected，或bs-select enable／disable时，需要调用刷新方法。
$('.selectpicker').selectpicker('refresh');
6）下拉显示、隐藏
.selectpicker(‘toggle’)
.selectpicker(‘hide’)
.selectpicker(‘show’)
7）.selectpicker(‘destroy’) 组件销毁
4、本文DEMO，复制另存html即可使用
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<title>BootStrap-Select</title>
<link rel="stylesheet" href="https://cdn.bootcss.com/twitter-bootstrap/3.3.7/css/bootstrap.min.css" />
<link rel="stylesheet" href="https://cdn.bootcss.com/font-awesome/4.5.0/css/font-awesome.min.css" />
<link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap-select/1.13.6/css/bootstrap-select.css" />
<script src="https://cdn.bootcss.com/jquery/1.11.1/jquery.min.js"></script>
<script src="https://cdn.bootcss.com/twitter-bootstrap/3.3.7/js/bootstrap.min.js"></script>
<script src="https://cdn.bootcss.com/bootstrap-select/1.13.6/js/bootstrap-select.js"></script>
</head>
<body>
<div class="page-content container">
<div class='page-body'>
<div class='panel panel-default'>
<div class="panel-heading"><h3 class='panel-title'>使用selectpicker类</h3></div>
<table class='table table-bordered'>
<thead>
<tr>
<th width=35>No.</th>
<th width="70%">描述</th>
<th width="30%">选择框</th>
</tr>
</thead>
<tbody>
<tr>
<td>1</td>
<td>普通标准单选框</td>
<td>
<select class="selectpicker">
<option>Mustard</option>
<option>Ketchup</option>
<option>Relish</option>
</select>
</td></tr>
<tr>
<td>2</td>
<td>带下拉分组optgroup, 选中项显示对勾</td>
<td>
<select class="selectpicker" data-show-tick="true">
<optgroup label="Picnic">
<option>Mustard</option>
<option>Ketchup</option>
<option>Relish</option>
</optgroup>
<optgroup label="Camping">
<option>Tent</option>
<option>Flashlight</option>
<option>Toilet Paper</option>
</optgroup>
</select>
</td></tr>
<tr>
<td>3</td>
<td>多选，设置noneSelectedText为'--请选择--'</td>
<td>
<select class="selectpicker" data-none-selected-text="--请选择--" multiple>
<option>Hot Dog, Fries and a Soda</option>
<option>Burger, Shake and a Smile</option>
<option>Sugar, Spice and all things nice</option>
</select>
</td></tr>
<tr>
<td>4</td>
<td>多选，设置下拉框右对齐，最多可选2项</td>
<td>
<select class="selectpicker" multiple data-max-options="2" data-dropdown-align-right = "true">
<option>Hot Dog, Fries and a Soda</option>
<option>Burger, Shake and a Smile</option>
<option>Sugar, Spice and all things nice</option>
</select>
</td></tr>
<tr>
<td>5</td>
<td>多选，显示选中全部和取消选中按钮，并设置英文文本为中文</td>
<td>
<select class="selectpicker" multiple data-actions-box="true" data-deselect-all-text = '取消选中' data-select-all-text='选中全部'>
<option>Mustard</option>
<option>Ketchup</option>
<option>Relish</option>
</select>
</td></tr>
<tr>
<td>6</td>
<td>多选，显示搜索框，可通过option data-tokens="ketchup mustard"来指定搜索关键字</td>
<td>
<select class="selectpicker" multiple data-live-search="true" data-none-results-text="没找到相应记录{0}">
<option data-tokens="ketchup mustard">Hot Dog, Fries and a Soda</option>
<option data-tokens="mustard">Burger, Shake and a Smile</option>
<option data-tokens="frosting">Sugar, Spice and all things nice</option>
</select>
</td></tr>
</tbody>
</table>
</div>
<div class="panel panel-default">
<div class="panel-heading"><h3 class='panel-title'>使用js来初始化</h3></div>
<table class='table table-bordered'>
<thead>
<tr>
<th width=35>No.</th>
<th width="70%">描述</th>
<th width="30%">选择框</th>
</tr>
</thead>
<tbody>
<tr>
<td>1</td>
<td>普通标准单选框 <button class='btn btn-sm btn-primary' type='button' onclick='make1()'>初始化</button></td>
<td>
<select class="form-control input-sm" id="bs-select1">
<option>Mustard</option>
<option>Ketchup</option>
<option>Relish</option>
</select>
</td></tr>
<tr>
<td>2</td>
<td>带下拉分组optgroup, 选中项显示对勾 <button class='btn btn-sm btn-primary' type='button' onclick='make2()'>初始化</button></td>
<td>
<select class="form-control input-sm" id="bs-select2">
<optgroup label="Picnic">
<option>Mustard</option>
<option>Ketchup</option>
<option>Relish</option>
</optgroup>
<optgroup label="Camping">
<option>Tent</option>
<option>Flashlight</option>
<option>Toilet Paper</option>
</optgroup>
</select>
</td></tr>
<tr>
<td>3</td>
<td>多选，显示搜索框，可通过option data-tokens="ketchup mustard"来指定搜索关键字 <button class='btn btn-sm btn-primary' type='button' onclick='make3()'>初始化</button></td>
<td>
<select class="form-control input-sm" size=1 multiple id="bs-select3">
<option data-tokens="ketchup mustard">Hot Dog, Fries and a Soda</option>
<option data-tokens="mustard">Burger, Shake and a Smile</option>
<option data-tokens="frosting">Sugar, Spice and all things nice</option>
</select>
</td></tr>
</tbody>
</table>
</div>
<div class="panel panel-default">
<div class="panel-heading"><h3 class='panel-title'>API方法列表</h3></div>
<table class='table table-bordered'>
<thead>
<tr>
<th width=35>No.</th>
<th width="70%">描述</th>
<th width="30%">选择框</th>
</tr>
</thead>
<tbody>
<tr>
<td>1</td>
<td>单选框取值、赋值 <button class='btn btn-sm btn-primary' type='button' onclick='getval1()'>取值</button>
<button class='btn btn-sm btn-primary' type='button' onclick='setval1()'>赋值</button></td>
<td>
<select class="form-control input-sm selectpicker" id="api-select1">
<option>Mustard</option>
<option>Ketchup</option>
<option>Relish</option>
</select>
</td></tr>
<tr>
<td>2</td>
<td>多选框取值、赋值 <button class='btn btn-sm btn-primary' type='button' onclick='getval2()'>取值</button>
<button class='btn btn-sm btn-primary' type='button' onclick='setval2()'>赋值</button></td>
<td>
<select class="form-control input-sm selectpicker" multiple id="api-select2">
<option>Mustard</option>
<option>Ketchup</option>
<option>Relish</option>
<option>Marcus</option>
<option>Lmlxj</option>
</select>
</td></tr>
<tr>
<td>3</td>
<td>删除option,render和refresh比较, option增|删|selected改变需要调用refresh才生效 <button class='btn btn-sm btn-primary' type='button' onclick='del3()'>删除option</button>
<button class='btn btn-sm btn-primary' type='button' onclick='render3()'>render</button>
<button class='btn btn-sm btn-primary' type='button' onclick='refresh3()'>refresh</button>
</td>
<td>
<select class="selectpicker form-control input-sm" id="api-select3">
<optgroup label="Picnic">
<option value="Mustard">Mustard</option>
<option value="Ketchup">Ketchup</option>
<option value="Relish">Relish</option>
</optgroup>
<optgroup label="Camping">
<option value="Tent">Tent</option>
<option value="Flashlight">Flashlight</option>
<option value="Toilet Paper">Toilet Paper</option>
</optgroup>
</select>
</td></tr>
</tbody>
</table>
</div>
</div>
</div>
<script type="text/javascript">
function make1() {
$("#bs-select1").selectpicker();
}
function make2() {
$("#bs-select2").selectpicker({showTick: true});
}
function make3() {
$("#bs-select3").selectpicker({liveSearch: true, noneResultsText: "没找到相应记录{0}"});
}
function getval1() {
alert('selectpicker("val"): ' + $("#api-select1").selectpicker('val'));
alert('$("#api-select1").val(): ' + $("#api-select1").val());
}
function setval1() {
$("#api-select1").selectpicker('val', 'Ketchup');
// 或 $("#api-select1").val('Ketchup').selectpicker('refresh');
}
function getval2() {
alert('selectpicker("val"): ' + $("#api-select2").selectpicker('val'));
alert('$("#api-select1").val(): ' + $("#api-select2").val());
}
function setval2() {
$("#api-select2").selectpicker('val', ['Ketchup','Marcus']);
// $("#api-select2").val(['Ketchup','Marcus']).selectpicker('refresh');
}
function del3() {
$('#api-select3').find('[value=Ketchup]').remove();
}
function render3() {
$('#api-select3').selectpicker('render');
}
function refresh3() {
$('#api-select3').selectpicker('refresh');
}
</script>
</body>
</html>