下拉列表（Select）

使用重置的CSS，重定義原生的下拉列表外觀。

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默認

自定義code><select>菜單只需要一個自定義類.form-select就可以觸發自定義樣式。自定義樣式僅限于select的初始外觀，并且由于瀏覽器的限制，無法修改<option>。

<select class="form-select" aria-label="Default select example">
<option selected>Open this select menu</option>
<option value="1">One</option>
<option value="2">Two</option>
<option value="3">Three</option>
</select>

大小

Y您也可以選擇從小型和大型定制選擇，以匹配我們同樣大小的文本輸入。

<select class="form-select form-select-lg mb-3" aria-label=".form-select-lg example">
<option selected>Open this select menu</option>
<option value="1">One</option>
<option value="2">Two</option>
<option value="3">Three</option>
</select>

<select class="form-select form-select-sm" aria-label=".form-select-sm example">
<option selected>Open this select menu</option>
<option value="1">One</option>
<option value="2">Two</option>
<option value="3">Three</option>
</select>

還支持多文件屬性multiple ,按住Ctrl鍵，可以一次選擇多個選項

<select class="form-select" multiple aria-label="multiple select example">
<option selected>Open this select menu</option>
<option value="1">One</option>
<option value="2">Two</option>
<option value="3">Three</option>
</select>

支持大小屬性 size :

<select class="form-select" size="3" aria-label="size 3 select example">
<option selected>Open this select menu</option>
<option value="1">One</option>
<option value="2">Two</option>
<option value="3">Three</option>
</select>

禁用

在select上添加 disabled屬性，使其顯示為灰色，并刪除指針事件。

<select class="form-select" aria-label="Disabled select example" disabled>
<option selected>Open this select menu</option>
<option value="1">One</option>
<option value="2">Two</option>
<option value="3">Three</option>
</select>

Sass

Variables

$form-select-padding-y:             $input-padding-y;
$form-select-padding-x:             $input-padding-x;
$form-select-font-family:           $input-font-family;
$form-select-font-size:             $input-font-size;
$form-select-indicator-padding:     $form-select-padding-x * 3; // Extra padding for background-image
$form-select-font-weight:           $input-font-weight;
$form-select-line-height:           $input-line-height;
$form-select-color:                 $input-color;
$form-select-bg:                    $input-bg;
$form-select-disabled-color:        null;
$form-select-disabled-bg:           $gray-200;
$form-select-disabled-border-color: $input-disabled-border-color;
$form-select-bg-position:           right $form-select-padding-x center;
$form-select-bg-size:               16px 12px; // In pixels because image dimensions
$form-select-indicator-color:       $gray-800;
$form-select-indicator:             url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'><path fill='none' stroke='#{$form-select-indicator-color}' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M2 5l6 6 6-6'/></svg>");

$form-select-feedback-icon-padding-end: $form-select-padding-x * 2.5 + $form-select-indicator-padding;
$form-select-feedback-icon-position:    center right $form-select-indicator-padding;
$form-select-feedback-icon-size:        $input-height-inner-half $input-height-inner-half;

$form-select-border-width:        $input-border-width;
$form-select-border-color:        $input-border-color;
$form-select-border-radius:       $border-radius;
$form-select-box-shadow:          $box-shadow-inset;

$form-select-focus-border-color:  $input-focus-border-color;
$form-select-focus-width:         $input-focus-width;
$form-select-focus-box-shadow:    0 0 0 $form-select-focus-width $input-btn-focus-color;

$form-select-padding-y-sm:        $input-padding-y-sm;
$form-select-padding-x-sm:        $input-padding-x-sm;
$form-select-font-size-sm:        $input-font-size-sm;

$form-select-padding-y-lg:        $input-padding-y-lg;
$form-select-padding-x-lg:        $input-padding-x-lg;
$form-select-font-size-lg:        $input-font-size-lg;