select2 未显示向下箭头图标

Question

我的 select2 运行良好，我只有 1 个小错误，选择框中的向下箭头图标没有显示，你们知道为什么吗？

这让用户有点困惑我试图找到错误，但我无法修复错误，请大家帮帮我吗？代码在这里不起作用，但在 jsfiddle 链接中起作用。

jsfiddle：http://jsfiddle.net/yszv1ob2/

$("#e1").select2();

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<script src="http://cdnjs.cloudflare.com/ajax/libs/select2/3.2/select2.min.js"></script>
<link rel="stylesheet" href="http://cdnjs.cloudflare.com/ajax/libs/select2/3.2/select2.css">

<select multiple id="e1" style="width:300px">
  <option value="AL">Alabama</option>
  <option value="Am">Amalapuram</option>
  <option value="An">Anakapalli</option>
  <option value="Ak">Akkayapalem</option>
  <option value="WY">Wyoming</option>
</select>

Answer 1

对于 Select2 版本 4.0.5+，此代码与单选箭头完全相同。

.select2-selection--multiple:before {
    content: "";
    position: absolute;
    right: 7px;
    top: 42%;
    border-top: 5px solid #888;
    border-left: 4px solid transparent;
    border-right: 4px solid transparent;
}

Answer 2

您已经使用了多选下拉菜单并且使用了插件（Select2）不要在多选下拉菜单中添加下拉箭头。因此，如果要添加下拉箭头，则必须添加一些自定义 CSS，如下所示。

ul.select2-choices {
    padding-right: 30px !important;
}

ul.select2-choices:after {
    content: "";
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    border-top: 5px solid #333;
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
}

Answer 3

$(function () {
  $("#select1").select2();
});

.select2-container--default .select2-selection--multiple:before {
    content: ' ';
    display: block;
    position: absolute;
    border-color: #888 transparent transparent transparent;
    border-style: solid;
    border-width: 5px 4px 0 4px;
    height: 0;
    right: 6px;
    margin-left: -4px;
    margin-top: -2px;top: 50%;
    width: 0;cursor: pointer
}

.select2-container--open .select2-selection--multiple:before {
    content: ' ';
    display: block;
    position: absolute;
    border-color: transparent transparent #888 transparent;
    border-width: 0 4px 5px 4px;
    height: 0;
    right: 6px;
    margin-left: -4px;
    margin-top: -2px;top: 50%;
    width: 0;cursor: pointer
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<link href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.6-rc.0/css/select2.min.css" rel="stylesheet" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.6-rc.0/js/select2.min.js"></script>

<select multiple id="select1" style="width: 300px">
  <option value="AL">Alabama</option>
  <option value="Am">Amalapuram</option>
  <option value="An">Anakapalli</option>
  <option value="Ak">Akkayapalem</option>
  <option value="WY">Wyoming</option>
</select>

来源：https://github.com/select2/select2/issues/167#issuecomment-322461384

Answer 4

基于Adam Love's answer，此代码使用 FontAwesome chevron down 图标（尽管您可以轻松地将其换成不同的图标）：

.select2-container--default .select2-selection--multiple {
    padding-right: 20px;
}
.select2-container--default .select2-selection--multiple::after {
    position: absolute;
    right: 5px;
    top: 42%;
    font-family: 'Font Awesome 5 Free';
    font-weight: 900;
    -webkit-font-smoothing: antialiased;
    display: inline-block;
    font-style: normal;
    font-variant: normal;
    text-rendering: auto;
    line-height: 1;
    content: "\f078";
    font-size: 0.7rem;
}

Answer 5

$("#e1").select2();

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<script src="http://cdnjs.cloudflare.com/ajax/libs/select2/3.2/select2.min.js"></script>
<link rel="stylesheet" href="http://cdnjs.cloudflare.com/ajax/libs/select2/3.2/select2.css">

<select multiple id="e1" style="width:300px">
  <option value="AL">Alabama</option>
  <option value="Am">Amalapuram</option>
  <option value="An">Anakapalli</option>
  <option value="Ak">Akkayapalem</option>
  <option value="WY">Wyoming</option>
</select>

Answer 6

您可以添加此 css 代码，它将应用于选择范围

.select2-selection__arrow {
  height: 26px;
  position: absolute;
  top: 10px;
  right: 7px;
  width: 20px;
}
.select2-selection__arrow b{
    border-color: #009688 transparent transparent transparent;
    border-style: solid;
    border-width: 5px 4px 0 4px;
    height: 0;
    left: 50%;
    margin-left: -4px;
    margin-top: -2px;
    position: absolute;
    top: 50%;
    width: 0;
  }