CSS Select2 下拉选择框的样式

Styling of Select2 dropdown select boxes

提问by Ruben

I'm using Select2 in a project to style some select boxes in a search form. I managed to change the gradient background of the arrow container to a black gradient:

我在一个项目中使用 Select2 在搜索表单中设置一些选择框的样式。我设法将箭头容器的渐变背景更改为黑色渐变：

.select2-container .select2-choice .select2-arrow {
    background-image: -khtml-gradient(linear, left top, left bottom, from(#424242), to(#030303));
    background-image: -moz-linear-gradient(top, #424242, #030303);
    background-image: -ms-linear-gradient(top, #424242, #030303);
    background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #424242), color-stop(100%, #030303));
    background-image: -webkit-linear-gradient(top, #424242, #030303);
    background-image: -o-linear-gradient(top, #424242, #030303);
    background-image: linear-gradient(#424242, #030303);
}

I would like the arrow to be white, but unfortunately Select2 is using a background image for the different icons instead of font-awesome or something similar, so there's no way to just change the color with CSS.

我希望箭头是白色的，但不幸的是 Select2 为不同的图标使用了背景图像，而不是 font-awesome 或类似的东西，因此无法仅使用 CSS 更改颜色。

What would be the easiest way to make the arrow white instead of the default grey? Do I really have to replace the background png (select2.png and select2x2.png) with my own? Or is there an easier method?

使箭头变为白色而不是默认的灰色的最简单方法是什么？我真的必须用我自己的背景 png（select2.png 和 select2x2.png）替换吗？或者有更简单的方法吗？

Another question I have is how to change the height of the select boxes. I know how to change the height of the dropdown box in opened state, but I want to change the height of the selectbox in closed state. Any ideas?

我的另一个问题是如何更改选择框的高度。我知道如何在打开状态下更改下拉框的高度，但我想在关闭状态下更改选择框的高度。有任何想法吗？

回答by Ruben

Thanks for the suggestions in the comments. I made a bit of a dirty hack to get what I want without having to create my own image. With javascript I first hide the default tag that's being used for the down arrow, like so:

感谢评论中的建议。我做了一些肮脏的黑客来获得我想要的东西，而不必创建我自己的图像。使用 javascript 我首先隐藏用于向下箭头的默认标签，如下所示：

$('b[role="presentation"]').hide();

I then included font-awesome in my page and add my own down arrow, again with a line of javascript, to replace the default one:

然后我在我的页面中包含了 font-awesome 并添加了我自己的向下箭头，再次使用一行 javascript 来替换默认的：

$('.select2-arrow').append('<i class="fa fa-angle-down"></i>');

Then with CSS I style the select boxes. I set the height, change the background color of the arrow area to a gradient black, change the width, font-size and also the color of the down arrow to white:

然后使用 CSS 设置选择框的样式。我设置了高度，将箭头区域的背景颜色更改为渐变黑色，将宽度、字体大小以及向下箭头的颜色更改为白色：

.select2-container .select2-choice {
    padding: 5px 10px;
    height: 40px;
    width: 132px; 
    font-size: 1.2em;  
}

.select2-container .select2-choice .select2-arrow {
    background-image: -khtml-gradient(linear, left top, left bottom, from(#424242), to(#030303));
    background-image: -moz-linear-gradient(top, #424242, #030303);
    background-image: -ms-linear-gradient(top, #424242, #030303);
    background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #424242), color-stop(100%, #030303));
    background-image: -webkit-linear-gradient(top, #424242, #030303);
    background-image: -o-linear-gradient(top, #424242, #030303);
    background-image: linear-gradient(#424242, #030303);
    width: 40px;
    color: #fff;
    font-size: 1.3em;
    padding: 4px 12px;
}

The result is the styling the way I want it:

结果是我想要的样式：

Update 5/6/2015As @Katie Lacy mentioned in the other answer the classnames have been changed in version 4 of Select2. The updated CSS with the new classnames should look like this:

2015年 5 月 6 日更新正如@Katie Lacy 在另一个答案中提到的，Select2 的第 4 版中的类名已更改。带有新类名的更新后的 CSS 应如下所示：

.select2-container--default .select2-selection--single{
    padding:6px;
    height: 37px;
    width: 148px; 
    font-size: 1.2em;  
    position: relative;
}

.select2-container--default .select2-selection--single .select2-selection__arrow {
    background-image: -khtml-gradient(linear, left top, left bottom, from(#424242), to(#030303));
    background-image: -moz-linear-gradient(top, #424242, #030303);
    background-image: -ms-linear-gradient(top, #424242, #030303);
    background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #424242), color-stop(100%, #030303));
    background-image: -webkit-linear-gradient(top, #424242, #030303);
    background-image: -o-linear-gradient(top, #424242, #030303);
    background-image: linear-gradient(#424242, #030303);
    width: 40px;
    color: #fff;
    font-size: 1.3em;
    padding: 4px 12px;
    height: 27px;
    position: absolute;
    top: 0px;
    right: 0px;
    width: 20px;
}

JS:

JS：

$('b[role="presentation"]').hide();
$('.select2-selection__arrow').append('<i class="fa fa-angle-down"></i>');

回答by Katie

Here is a working example of above. http://jsfiddle.net/z7L6m2sc/Now select2 has been updated the classes have change may be why you cannot get it to work. Here is the css....

这是上面的一个工作示例。http://jsfiddle.net/z7L6m2sc/现在 select2 已经更新，类有变化可能是你无法让它工作的原因。这是css....

.select2-dropdown.select2-dropdown--below{
    width: 148px !important;
}

.select2-container--default .select2-selection--single{
    padding:6px;
    height: 37px;
    width: 148px; 
    font-size: 1.2em;  
    position: relative;
}

.select2-container--default .select2-selection--single .select2-selection__arrow {
    background-image: -khtml-gradient(linear, left top, left bottom, from(#424242), to(#030303));
    background-image: -moz-linear-gradient(top, #424242, #030303);
    background-image: -ms-linear-gradient(top, #424242, #030303);
    background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #424242), color-stop(100%, #030303));
    background-image: -webkit-linear-gradient(top, #424242, #030303);
    background-image: -o-linear-gradient(top, #424242, #030303);
    background-image: linear-gradient(#424242, #030303);
    width: 40px;
    color: #fff;
    font-size: 1.3em;
    padding: 4px 12px;
    height: 27px;
    position: absolute;
    top: 0px;
    right: 0px;
    width: 20px;
}

回答by lucasumberto

This is how i changed placeholder arrow color, the 2 classes are for dropdown open and dropdown closed, you need to change the #fff to the color you want:

这就是我更改占位符箭头颜色的方式，2 个类用于下拉打开和下拉关闭，您需要将 #fff 更改为您想要的颜色：

.select2-container--default.select2-container--open .select2-selection--single .select2-selection__arrow b {
    border-color: transparent transparent #fff transparent !important;
  }
  .select2-container--default .select2-selection--single .select2-selection__arrow b {
    border-color: #fff transparent transparent transparent !important;
  }