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輸入群組（Input group）

透過在文字輸入欄位、自訂選擇器和自訂檔案輸入欄位的兩側添加文字、按鈕或按鈕群組，輕鬆擴展表單控制項。

本頁內容

基本範例（Basic example）

將一個附加元素或按鈕放置在輸入欄位的任一側。您也可以在輸入欄位的兩側各放置一個。請記得將 <label> 放置在輸入群組的外部。

@
@example.com
https://example.com/users/
Example help text goes outside the input group.
$ .00
@
With textarea
html 
<div class="input-group mb-3">
  <span class="input-group-text" id="basic-addon1">@</span>
  <input type="text" class="form-control" placeholder="Username" aria-label="Username" aria-describedby="basic-addon1">
</div>

<div class="input-group mb-3">
  <input type="text" class="form-control" placeholder="Recipient’s username" aria-label="Recipient’s username" aria-describedby="basic-addon2">
  <span class="input-group-text" id="basic-addon2">@example.com</span>
</div>

<div class="mb-3">
  <label for="basic-url" class="form-label">Your vanity URL</label>
  <div class="input-group">
    <span class="input-group-text" id="basic-addon3">https://example.com/users/</span>
    <input type="text" class="form-control" id="basic-url" aria-describedby="basic-addon3 basic-addon4">
  </div>
  <div class="form-text" id="basic-addon4">Example help text goes outside the input group.</div>
</div>

<div class="input-group mb-3">
  <span class="input-group-text">$</span>
  <input type="text" class="form-control" aria-label="Amount (to the nearest dollar)">
  <span class="input-group-text">.00</span>
</div>

<div class="input-group mb-3">
  <input type="text" class="form-control" placeholder="Username" aria-label="Username">
  <span class="input-group-text">@</span>
  <input type="text" class="form-control" placeholder="Server" aria-label="Server">
</div>

<div class="input-group">
  <span class="input-group-text">With textarea</span>
  <textarea class="form-control" aria-label="With textarea"></textarea>
</div>

換行（Wrapping）

輸入群組預設透過 flex-wrap: wrap 進行換行，以便在輸入群組內容納自訂表單欄位驗證。您可以使用 .flex-nowrap 來停用此功能。

@
html 
<div class="input-group flex-nowrap">
  <span class="input-group-text" id="addon-wrapping">@</span>
  <input type="text" class="form-control" placeholder="Username" aria-label="Username" aria-describedby="addon-wrapping">
</div>

邊框圓角（Border radius）

由於當時瀏覽器支援的限制，border-radius 樣式只能套用於 .input-group 類別中的第一個和最後一個子元素。如果這些位置上有任何不可見的元素，將導致輸入群組呈現不正確。這個問題很可能要到 v6 才會修復。

@
html 
<div class="input-group">
  <span class="input-group-text" id="visible-addon">@</span>
  <input type="text" class="form-control" placeholder="Username" aria-label="Username" aria-describedby="visible-addon">
  <input type="text" class="form-control d-none" placeholder="Hidden input" aria-label="Hidden input" aria-describedby="visible-addon">
</div>

尺寸（Sizing）

將相對的表單尺寸類別加到 .input-group 本身，其中的內容將自動調整大小——不需要在每個元素上重複表單控制項尺寸類別。

不支援對個別輸入群組元素設定尺寸。

Small
Default
Large
html 
<div class="input-group input-group-sm mb-3">
  <span class="input-group-text" id="inputGroup-sizing-sm">Small</span>
  <input type="text" class="form-control" aria-label="Sizing example input" aria-describedby="inputGroup-sizing-sm">
</div>

<div class="input-group mb-3">
  <span class="input-group-text" id="inputGroup-sizing-default">Default</span>
  <input type="text" class="form-control" aria-label="Sizing example input" aria-describedby="inputGroup-sizing-default">
</div>

<div class="input-group input-group-lg">
  <span class="input-group-text" id="inputGroup-sizing-lg">Large</span>
  <input type="text" class="form-control" aria-label="Sizing example input" aria-describedby="inputGroup-sizing-lg">
</div>

核取方塊與單選按鈕（Checkboxes and radios）

將任何核取方塊或單選按鈕選項放置在輸入群組的附加元素中，取代文字。當輸入欄位旁邊沒有可見文字時，我們建議在 .form-check-input 上加入 .mt-0。

html 
<div class="input-group mb-3">
  <div class="input-group-text">
    <input class="form-check-input mt-0" type="checkbox" value="" aria-label="Checkbox for following text input">
  </div>
  <input type="text" class="form-control" aria-label="Text input with checkbox">
</div>

<div class="input-group">
  <div class="input-group-text">
    <input class="form-check-input mt-0" type="radio" value="" aria-label="Radio button for following text input">
  </div>
  <input type="text" class="form-control" aria-label="Text input with radio button">
</div>

多個輸入欄位（Multiple inputs）

雖然視覺上支援多個 <input>，但驗證樣式僅適用於只有單一 <input> 的輸入群組。

First and last name
html 
<div class="input-group">
  <span class="input-group-text">First and last name</span>
  <input type="text" aria-label="First name" class="form-control">
  <input type="text" aria-label="Last name" class="form-control">
</div>

多個附加元素（Multiple addons）

支援多個附加元素，並可與核取方塊和單選按鈕輸入版本混合使用。

$ 0.00
$ 0.00
html 
<div class="input-group mb-3">
  <span class="input-group-text">$</span>
  <span class="input-group-text">0.00</span>
  <input type="text" class="form-control" aria-label="Dollar amount (with dot and two decimal places)">
</div>

<div class="input-group">
  <input type="text" class="form-control" aria-label="Dollar amount (with dot and two decimal places)">
  <span class="input-group-text">$</span>
  <span class="input-group-text">0.00</span>
</div>

按鈕附加元素（Button addons）

html 
<div class="input-group mb-3">
  <button class="btn btn-outline-secondary" type="button" id="button-addon1">Button</button>
  <input type="text" class="form-control" placeholder="" aria-label="Example text with button addon" aria-describedby="button-addon1">
</div>

<div class="input-group mb-3">
  <input type="text" class="form-control" placeholder="Recipient’s username" aria-label="Recipient’s username" aria-describedby="button-addon2">
  <button class="btn btn-outline-secondary" type="button" id="button-addon2">Button</button>
</div>

<div class="input-group mb-3">
  <button class="btn btn-outline-secondary" type="button">Button</button>
  <button class="btn btn-outline-secondary" type="button">Button</button>
  <input type="text" class="form-control" placeholder="" aria-label="Example text with two button addons">
</div>

<div class="input-group">
  <input type="text" class="form-control" placeholder="Recipient’s username" aria-label="Recipient’s username with two button addons">
  <button class="btn btn-outline-secondary" type="button">Button</button>
  <button class="btn btn-outline-secondary" type="button">Button</button>
</div>

帶有下拉選單的按鈕（Buttons with dropdowns）

html 
<div class="input-group mb-3">
  <button class="btn btn-outline-secondary dropdown-toggle" type="button" data-bs-toggle="dropdown" aria-expanded="false">Dropdown</button>
  <ul class="dropdown-menu">
    <li><a class="dropdown-item" href="#">Action</a></li>
    <li><a class="dropdown-item" href="#">Another action</a></li>
    <li><a class="dropdown-item" href="#">Something else here</a></li>
    <li><hr class="dropdown-divider"></li>
    <li><a class="dropdown-item" href="#">Separated link</a></li>
  </ul>
  <input type="text" class="form-control" aria-label="Text input with dropdown button">
</div>

<div class="input-group mb-3">
  <input type="text" class="form-control" aria-label="Text input with dropdown button">
  <button class="btn btn-outline-secondary dropdown-toggle" type="button" data-bs-toggle="dropdown" aria-expanded="false">Dropdown</button>
  <ul class="dropdown-menu dropdown-menu-end">
    <li><a class="dropdown-item" href="#">Action</a></li>
    <li><a class="dropdown-item" href="#">Another action</a></li>
    <li><a class="dropdown-item" href="#">Something else here</a></li>
    <li><hr class="dropdown-divider"></li>
    <li><a class="dropdown-item" href="#">Separated link</a></li>
  </ul>
</div>

<div class="input-group">
  <button class="btn btn-outline-secondary dropdown-toggle" type="button" data-bs-toggle="dropdown" aria-expanded="false">Dropdown</button>
  <ul class="dropdown-menu">
    <li><a class="dropdown-item" href="#">Action before</a></li>
    <li><a class="dropdown-item" href="#">Another action before</a></li>
    <li><a class="dropdown-item" href="#">Something else here</a></li>
    <li><hr class="dropdown-divider"></li>
    <li><a class="dropdown-item" href="#">Separated link</a></li>
  </ul>
  <input type="text" class="form-control" aria-label="Text input with 2 dropdown buttons">
  <button class="btn btn-outline-secondary dropdown-toggle" type="button" data-bs-toggle="dropdown" aria-expanded="false">Dropdown</button>
  <ul class="dropdown-menu dropdown-menu-end">
    <li><a class="dropdown-item" href="#">Action</a></li>
    <li><a class="dropdown-item" href="#">Another action</a></li>
    <li><a class="dropdown-item" href="#">Something else here</a></li>
    <li><hr class="dropdown-divider"></li>
    <li><a class="dropdown-item" href="#">Separated link</a></li>
  </ul>
</div>

分段按鈕（Segmented buttons）

html 
<div class="input-group mb-3">
  <button type="button" class="btn btn-outline-secondary">Action</button>
  <button type="button" class="btn btn-outline-secondary dropdown-toggle dropdown-toggle-split" data-bs-toggle="dropdown" aria-expanded="false">
    <span class="visually-hidden">Toggle Dropdown</span>
  </button>
  <ul class="dropdown-menu">
    <li><a class="dropdown-item" href="#">Action</a></li>
    <li><a class="dropdown-item" href="#">Another action</a></li>
    <li><a class="dropdown-item" href="#">Something else here</a></li>
    <li><hr class="dropdown-divider"></li>
    <li><a class="dropdown-item" href="#">Separated link</a></li>
  </ul>
  <input type="text" class="form-control" aria-label="Text input with segmented dropdown button">
</div>

<div class="input-group">
  <input type="text" class="form-control" aria-label="Text input with segmented dropdown button">
  <button type="button" class="btn btn-outline-secondary">Action</button>
  <button type="button" class="btn btn-outline-secondary dropdown-toggle dropdown-toggle-split" data-bs-toggle="dropdown" aria-expanded="false">
    <span class="visually-hidden">Toggle Dropdown</span>
  </button>
  <ul class="dropdown-menu dropdown-menu-end">
    <li><a class="dropdown-item" href="#">Action</a></li>
    <li><a class="dropdown-item" href="#">Another action</a></li>
    <li><a class="dropdown-item" href="#">Something else here</a></li>
    <li><hr class="dropdown-divider"></li>
    <li><a class="dropdown-item" href="#">Separated link</a></li>
  </ul>
</div>

自訂表單（Custom forms）

輸入群組支援自訂選擇器和自訂檔案輸入。不支援這些元素的瀏覽器預設版本。

自訂選擇器（Custom select）

html 
<div class="input-group mb-3">
  <label class="input-group-text" for="inputGroupSelect01">Options</label>
  <select class="form-select" id="inputGroupSelect01">
    <option selected>Choose...</option>
    <option value="1">One</option>
    <option value="2">Two</option>
    <option value="3">Three</option>
  </select>
</div>

<div class="input-group mb-3">
  <select class="form-select" id="inputGroupSelect02">
    <option selected>Choose...</option>
    <option value="1">One</option>
    <option value="2">Two</option>
    <option value="3">Three</option>
  </select>
  <label class="input-group-text" for="inputGroupSelect02">Options</label>
</div>

<div class="input-group mb-3">
  <button class="btn btn-outline-secondary" type="button">Button</button>
  <select class="form-select" id="inputGroupSelect03" aria-label="Example select with button addon">
    <option selected>Choose...</option>
    <option value="1">One</option>
    <option value="2">Two</option>
    <option value="3">Three</option>
  </select>
</div>

<div class="input-group">
  <select class="form-select" id="inputGroupSelect04" aria-label="Example select with button addon">
    <option selected>Choose...</option>
    <option value="1">One</option>
    <option value="2">Two</option>
    <option value="3">Three</option>
  </select>
  <button class="btn btn-outline-secondary" type="button">Button</button>
</div>

自訂檔案輸入（Custom file input）

html 
<div class="input-group mb-3">
  <label class="input-group-text" for="inputGroupFile01">Upload</label>
  <input type="file" class="form-control" id="inputGroupFile01">
</div>

<div class="input-group mb-3">
  <input type="file" class="form-control" id="inputGroupFile02">
  <label class="input-group-text" for="inputGroupFile02">Upload</label>
</div>

<div class="input-group mb-3">
  <button class="btn btn-outline-secondary" type="button" id="inputGroupFileAddon03">Button</button>
  <input type="file" class="form-control" id="inputGroupFile03" aria-describedby="inputGroupFileAddon03" aria-label="Upload">
</div>

<div class="input-group">
  <input type="file" class="form-control" id="inputGroupFile04" aria-describedby="inputGroupFileAddon04" aria-label="Upload">
  <button class="btn btn-outline-secondary" type="button" id="inputGroupFileAddon04">Button</button>
</div>

CSS

Sass 變數（Sass variables）

scss/_variables.scss 
$input-group-addon-padding-y:           $input-padding-y;
$input-group-addon-padding-x:           $input-padding-x;
$input-group-addon-font-weight:         $input-font-weight;
$input-group-addon-color:               $input-color;
$input-group-addon-bg:                  var(--#{$prefix}tertiary-bg);
$input-group-addon-border-color:        $input-border-color;