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Bootstrap表單控件是一種擴(kuò)展了我們用類重置的表單樣式的工具，它提供了許多用于自定義顯示的選項(xiàng)，以便在瀏覽器和設(shè)備之間實(shí)現(xiàn)更一致的呈現(xiàn)。這些控件包括文本輸入框、文本區(qū)域、復(fù)選框、單選按鈕和下拉菜單等，它們都可以通過(guò)Bootstrap的樣式進(jìn)行定制和擴(kuò)展。

一、示例

下面是一個(gè)演示 Bootstrap 表單樣式的簡(jiǎn)單示例。

<form>
<div class="form-group">
<label for="exampleInputEmail1">Email address</label>
<input type="email" class="form-control" id="exampleInputEmail1" aria-describedby="emailHelp">
<small id="emailHelp" class="form-text text-muted">We'll never share your email with anyone else.</small>
</div>
<div class="form-group">
<label for="exampleInputPassword1">Password</label>
<input type="password" class="form-control" id="exampleInputPassword1">
</div>
<div class="form-group form-check">
<input type="checkbox" class="form-check-input" id="exampleCheck1">
<label class="form-check-label" for="exampleCheck1">Check me out</label>
</div>
<button type="submit" class="btn btn-primary">Submit</button>

二、表單控件

文本表單控件（如<input>、<select> 和<textarea>）使用.form-control類設(shè)置樣式。包括一般外觀、焦點(diǎn)狀態(tài)、大小等樣式。

<form>
<div class="form-group">
<label for="exampleFormControlInput1">Email address</label>
<input type="email" class="form-control" id="exampleFormControlInput1" placeholder="name@example.com">
</div>
<div class="form-group">
<label for="exampleFormControlSelect1">Example select</label>
<select class="form-control" id="exampleFormControlSelect1">
<option>1</option>
<option>2</option>
<option>3</option>
<option>4</option>
<option>5</option>
</select>
</div>
<div class="form-group">
<label for="exampleFormControlSelect2">Example multiple select</label>
<select multiple class="form-control" id="exampleFormControlSelect2">
<option>1</option>
<option>2</option>
<option>3</option>
<option>4</option>
<option>5</option>
</select>
</div>
<div class="form-group">
<label for="exampleFormControlTextarea1">Example textarea</label>
<textarea class="form-control" id="exampleFormControlTextarea1" rows="3"></textarea>
</div>
</form>

對(duì)于文件輸入，請(qǐng)將 for ..form-control.form-control-file

<form>
<div class="form-group">
<label for="exampleFormControlFile1">Example file input</label>
<input type="file" class="form-control-file" id="exampleFormControlFile1">
</div>
</form>

三、大小

使用諸如.form-control-lg 和 .form-control-sm之類的類設(shè)置高度。

<input class="form-control form-control-lg" type="text" placeholder=".form-control-lg">
<input class="form-control" type="text" placeholder="Default input">
<input class="form-control form-control-sm" type="text" placeholder=".form-control-sm">

<select class="form-control form-control-lg">
<option>Large select</option>
</select>
<select class="form-control">
<option>Default select</option>
</select>
<select class="form-control form-control-sm">
<option>Small select</option>
</select>

四、只讀

在輸入上添加readonly 屬性以防止修改輸入的值。只讀輸入看起來(lái)更輕（就像禁用的輸入一樣），但保留標(biāo)準(zhǔn)光標(biāo)

<input class="form-control" type="text" placeholder="Readonly input here..." readonly>

五、只讀純文本

如果要將表單中的<input readonly> 元素設(shè)置為純文本樣式，請(qǐng)使用.form-control-plaintext純文本類刪除默認(rèn)表單字段樣式并保留正確的邊距和填充。

<form>
<div class="form-group row">
<label for="staticEmail" class="col-sm-2 col-form-label">Email</label>
<div class="col-sm-10">
<input type="text" readonly class="form-control-plaintext" id="staticEmail" value="email@example.com">
</div>
</div>
<div class="form-group row">
<label for="inputPassword" class="col-sm-2 col-form-label">Password</label>
<div class="col-sm-10">
<input type="password" class="form-control" id="inputPassword">
</div>
</div>
</form>

<form class="form-inline">
<div class="form-group mb-2">
<label for="staticEmail2" class="sr-only">Email</label>
<input type="text" readonly class="form-control-plaintext" id="staticEmail2" value="email@example.com">
</div>
<div class="form-group mx-sm-3 mb-2">
<label for="inputPassword2" class="sr-only">Password</label>
<input type="password" class="form-control" id="inputPassword2" placeholder="Password">
</div>
<button type="submit" class="btn btn-primary mb-2">Confirm identity</button>
</form>

六、范圍輸入

使用.form-control-range可以設(shè)置水平滾動(dòng)的范圍輸入。

<form>
<div class="form-group">
<label for="formControlRange">Example Range input</label>
<input type="range" class="form-control-range" id="formControlRange">
</div>
</form>

七、復(fù)選框和單選按鈕

默認(rèn)復(fù)選框和單選按鈕在.form-check的幫助下得到了改進(jìn)，這兩種輸入類型的單個(gè)類改進(jìn)了其 HTML 元素的布局和行為。

1、默認(rèn)

默認(rèn)情況下，任意數(shù)量的直系同級(jí)復(fù)選框和無(wú)線電都將垂直堆疊，并用.form-check適當(dāng)間隔。

<div class="form-check">
<input class="form-check-input" type="checkbox" value="" id="defaultCheck1">
<label class="form-check-label" for="defaultCheck1">
Default checkbox
</label>
</div>
<div class="form-check">
<input class="form-check-input" type="checkbox" value="" id="defaultCheck2" disabled>
<label class="form-check-label" for="defaultCheck2">
Disabled checkbox
</label>
</div>

<div class="form-check">
<input class="form-check-input" type="radio" name="exampleRadios" id="exampleRadios1" value="option1" checked>
<label class="form-check-label" for="exampleRadios1">
Default radio
</label>
</div>
<div class="form-check">
<input class="form-check-input" type="radio" name="exampleRadios" id="exampleRadios2" value="option2">
<label class="form-check-label" for="exampleRadios2">
Second default radio
</label>
</div>
<div class="form-check">
<input class="form-check-input" type="radio" name="exampleRadios" id="exampleRadios3" value="option3" disabled>
<label class="form-check-label" for="exampleRadios3">
Disabled radio
</label>
</div>

2、內(nèi)嵌

通過(guò)將復(fù)選框或單選按鈕添加到任何 .form-check-inline.form-check。

<div class="form-check form-check-inline">
<input class="form-check-input" type="checkbox" id="inlineCheckbox1" value="option1">
<label class="form-check-label" for="inlineCheckbox1">1</label>
</div>
<div class="form-check form-check-inline">
<input class="form-check-input" type="checkbox" id="inlineCheckbox2" value="option2">
<label class="form-check-label" for="inlineCheckbox2">2</label>
</div>
<div class="form-check form-check-inline">
<input class="form-check-input" type="checkbox" id="inlineCheckbox3" value="option3" disabled>
<label class="form-check-label" for="inlineCheckbox3">3 (disabled)</label>
</div>

<div class="form-check form-check-inline">
<input class="form-check-input" type="radio" name="inlineRadioOptions" id="inlineRadio1" value="option1">
<label class="form-check-label" for="inlineRadio1">1</label>
</div>
<div class="form-check form-check-inline">
<input class="form-check-input" type="radio" name="inlineRadioOptions" id="inlineRadio2" value="option2">
<label class="form-check-label" for="inlineRadio2">2</label>
</div>
<div class="form-check form-check-inline">
<input class="form-check-input" type="radio" name="inlineRadioOptions" id="inlineRadio3" value="option3" disabled>
<label class="form-check-label" for="inlineRadio3">3 (disabled)</label>
</div>

3、無(wú)標(biāo)簽

添加到?jīng)]有任何標(biāo)簽文本的輸入中。請(qǐng)記住，仍要為輔助技術(shù)提供某種形式的輔助名稱（例如，使用.position-static.form-checkaria-label）。

<div class="form-check">
<input class="form-check-input position-static" type="checkbox" id="blankCheckbox" value="option1" aria-label="...">
</div>
<div class="form-check">
<input class="form-check-input position-static" type="radio" name="blankRadio" id="blankRadio1" value="option1" aria-label="...">
</div>