1.基本實(shí)例
單獨(dú)的表單控件會(huì)被自動(dòng)賦予一些全局樣式。所有設(shè)置了 .form-control類(lèi)的 <input>、<textarea> 和 <select> 元素都將被默認(rèn)設(shè)置寬度屬性為 width: 100%;。 將 label 元素和前面提到的控件包裹在 .form-group中可以獲得最好的排列。
<!DOCTYPE HTML><html><head><link rel="stylesheet" href="/stylesheets/bootstrap.min.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" > </head><body><div class="container"><form role="form"><div class="form-group"><label for="name">名稱(chēng)</label><input type="text" class="form-control" id="name" placeholder="請(qǐng)輸入名稱(chēng)"></div><div class="form-group"><label for="inputfile">文件輸入</label><input type="file" id="inputfile"><p class="help-block">這里是塊級(jí)幫助文本的實(shí)例。</p></div><div class="checkbox"><label><input type="checkbox"> 請(qǐng)打勾</label></div><button type="submit" class="btn btn-default">提交</button></form></div> </body></html>

不要將表單組合輸入框組混合使用
不要將表單組直接和輸入框組混合使用。建議將輸入框組嵌套到表單組中使用。
2.內(nèi)聯(lián)表單
為 <form> 元素添加 .form-inline 類(lèi)可使其內(nèi)容左對(duì)齊并且表現(xiàn)為inline-block 級(jí)別的控件。只適用于視口(viewport)至少在 768px 寬度時(shí)(視口寬度再小的話就會(huì)使表單折疊)。
可能需要手動(dòng)設(shè)置寬度
在 Bootstrap 中,輸入框和單選/多選框控件默認(rèn)被設(shè)置為 width: 100%; 寬度。在內(nèi)聯(lián)表單,我們將這些元素的寬度設(shè)置為 width: auto;,因此,多個(gè)控件可以排列在同一行。根據(jù)你的布局需求,可能需要一些額外的定制化組件。
一定要添加 label 標(biāo)簽
如果你沒(méi)有為每個(gè)輸入控件設(shè)置 label 標(biāo)簽,屏幕閱讀器將無(wú)法正確識(shí)別。對(duì)于這些內(nèi)聯(lián)表單,你可以通過(guò)為 label 設(shè)置 .sr-only類(lèi)將其隱藏。還有一些輔助技術(shù)提供label標(biāo)簽的替代方案,比如aria-label、aria-labelledby 或 title 屬性。如果這些都不存在,屏幕閱讀器可能會(huì)采取使用 placeholder 屬性,如果存在的話,使用占位符來(lái)替代其他的標(biāo)記,但要注意,這種方法是不妥當(dāng)?shù)摹?/p>
<!DOCTYPE HTML><html><head><link rel="stylesheet" href="/stylesheets/bootstrap.min.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" > </head><body><div class="container"><form class="form-inline"><div class="form-group"><label for="exampleInputName2">Name</label><input type="text" class="form-control" id="exampleInputName2" placeholder="匯智網(wǎng)"></div><div class="form-group"><label class="sr-only" for="exampleInputEmail2">Email</label><input type="email" class="form-control" id="exampleInputEmail2" placeholder="service@hubwiz.com"></div><button type="submit" class="btn btn-default">Send invitation</button></form></div> </body></html>

3.水平排列的表單
通過(guò)為表單添加 .form-horizontal 類(lèi),并聯(lián)合使用 Bootstrap 預(yù)置的柵格類(lèi),可以將 label 標(biāo)簽和控件組水平并排布局。這樣做將改變 .form-group 的行為,使其表現(xiàn)為柵格系統(tǒng)中的行(row),因此就無(wú)需再額外添加 .row 了。
<!DOCTYPE HTML><html><head><link rel="stylesheet" href="/stylesheets/bootstrap.min.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" > </head><body><div class="container"><form class="form-horizontal" role="form"><div class="form-group"><label for="firstname" class="col-sm-2 control-label">名字</label><div class="col-sm-10"><input type="text" class="form-control" id="firstname" placeholder="請(qǐng)輸入名字"></div></div><div class="form-group"><label for="lastname" class="col-sm-2 control-label">姓</label><div class="col-sm-10"><input type="text" class="form-control" id="lastname" placeholder="請(qǐng)輸入姓"></div></div><div class="form-group"><div class="col-sm-offset-2 col-sm-10"><div class="checkbox"><label><input type="checkbox"> 請(qǐng)記住我</label></div></div></div><div class="form-group"><div class="col-sm-offset-2 col-sm-10"><button type="submit" class="btn btn-default">登錄</button></div></div></form></div> </body></html>

4.被支持的控件1
表單布局實(shí)例中展示了其所支持的標(biāo)準(zhǔn)表單控件。
輸入框
包括大部分表單控件、文本輸入域控件,還支持所有 HTML5 類(lèi)型的輸入控件: text、password、datetime、datetime-local、date、month、time、week、number、email、url、search、tel和 color。
必須添加類(lèi)型聲明
只有正確設(shè)置了 type 屬性的輸入控件才能被賦予正確的樣式。
輸入控件組
如需在文本輸入域 <input> 前面或后面添加文本內(nèi)容或按鈕控件,請(qǐng)參考輸入控件組。
文本域
支持多行文本的表單控件。可根據(jù)需要改變 rows 屬性。
<textarea class="form-control" rows="3"></textarea><!DOCTYPE HTML><html><head><link rel="stylesheet" href="/stylesheets/bootstrap.min.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" > </head><body><div class="container"><div class="form-group"><input type="text" class="form-control" placeholder="文本輸入"></div><div class="form-group"><textarea class="form-control" rows="4" placeholder="文本框"></textarea></div></div> </body></html>

5.被支持的控件2
多選和單選框
多選框(checkbox)用于選擇列表中的一個(gè)或多個(gè)選項(xiàng),而單選框(radio)用于從多個(gè)選項(xiàng)中只選擇一個(gè)。
設(shè)置了 disabled 屬性的單選或多選框都能被賦予合適的樣式。對(duì)于和多選或單選框聯(lián)合使用的 <label> 標(biāo)簽,如果也希望將懸停于上方的鼠標(biāo)設(shè)置為“禁止點(diǎn)擊”的樣式,請(qǐng)將 .disabled 類(lèi)賦予 .radio、.radio-inline、.checkbox、.checkbox-inline 或 <fieldset>。
<!DOCTYPE HTML><html><head><link rel="stylesheet" href="/stylesheets/bootstrap.min.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" > </head><body><div class="checkbox"><label><input type="checkbox" value="">Option one is this and that—be sure to include why it's great</label></div><div class="checkbox disabled"><label><input type="checkbox" value="" disabled="">Option two is disabled</label></div><p></p><div class="radio"><label><input type="radio" name="optionsRadios" id="optionsRadios1" value="option1" checked="">Option one is this and that—be sure to include why it's great</label></div><p></p><p></p><div class="radio"><label><input type="radio" name="optionsRadios" id="optionsRadios2" value="option2">Option two can be something else and selecting it will deselect option one</label></div><p></p><p></p><div class="radio disabled"><label><input type="radio" name="optionsRadios" id="optionsRadios3" value="option3" disabled="">Option three is disabled</label></div></body></html>

內(nèi)聯(lián)單選和多選框
通過(guò)將 .checkbox-inline 或 .radio-inline 類(lèi)應(yīng)用到一系列的多選框(checkbox)或單選框(radio)控件上,可以使這些控件排列在一行。
<!DOCTYPE HTML><html><head><link rel="stylesheet" href="/stylesheets/bootstrap.min.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" > </head><body><div class="radio"><label class="checkbox-inline"><input type="checkbox" id="inlineCheckbox1" value="option1"> 1</label><label class="checkbox-inline"><input type="checkbox" id="inlineCheckbox2" value="option2"> 2</label><label class="checkbox-inline"><input type="checkbox" id="inlineCheckbox3" value="option3"> 3</label><label class="radio-inline"><input type="radio" name="inlineRadioOptions" id="inlineRadio1" value="option1"> 1</label><label class="radio-inline"><input type="radio" name="inlineRadioOptions" id="inlineRadio2" value="option2"> 2</label><label class="radio-inline"><input type="radio" name="inlineRadioOptions" id="inlineRadio3" value="option3"> 3</label></div></body></html>
下拉列表(select)
<!DOCTYPE HTML><html><head><link rel="stylesheet" href="/stylesheets/bootstrap.min.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" > </head><body><select class="form-control"><option>1</option><option>2</option><option>3</option><option>4</option><option>5</option></select><br><select multiple="" class="form-control">...</select></body></html>

6.靜態(tài)控件
如果需要在表單中將一行純文本和 label 元素放置于同一行,為 <p> 元素添加 .form-control-static 類(lèi)即可。
<!DOCTYPE HTML><html><head><link rel="stylesheet" href="/stylesheets/bootstrap.min.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" > </head><body><div class="container"><form class="form-horizontal" role="form"><div class="form-group"><div class="col-sm-10"><label class="col-sm-2 control-label">Email</label><p class="form-control-static">email@example.com</p></div></div><div class="form-group"><label for="inputPassword" class="col-sm-2 control-label">密碼</label><div class="col-sm-10"><input type="password" class="form-control" id="inputPassword" placeholder="請(qǐng)輸入密碼"></div></div></form><form class="form-inline"><div class="form-group"><label class="sr-only">Email</label></div><div class="form-group"><label for="inputPassword2" class="sr-only">Password</label><!--影藏--><input type="password" class="form-control" id="inputPassword2" placeholder="Password"></div><button type="submit" class="btn btn-default">Confirm identity</button></form></div> </body></html>

7.焦點(diǎn)狀態(tài)
我們將某些表單控件的默認(rèn) outline 樣式移除,然后對(duì) :focus 狀態(tài)賦予box-shadow 屬性。
<form><input class="form-control" id="focusInput" type="text" value="Demonstrative focus state"></form>
演示:focus 狀態(tài)
在本文檔中,我們?yōu)樯厦鎸?shí)例中的輸入框賦予了自定義的樣式,用于演示 .form-control 元素的 :focus 狀態(tài)。
<!DOCTYPE HTML><html><head><link rel="stylesheet" href="/stylesheets/bootstrap.min.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" > </head><body><div class="container"><br><form><input class="form-control" id="focusedInput" type="text" value="Demonstrative focus state"></form></div> </body></html>

8.禁用狀態(tài)
為輸入框設(shè)置 disabled 屬性可以禁止其與用戶(hù)有任何交互(焦點(diǎn)、輸入等)。被禁用的輸入框顏色更淺,并且還添加了 not-allowed 鼠標(biāo)狀態(tài)。
<input class="form-control" id="disabledInput" type="text" placeholder="Disabled input here..." disabled="">
被禁用的 fieldset
為<fieldset> 設(shè)置 disabled 屬性,可以禁用 <fieldset> 中包含的所有控件。
<a> 標(biāo)簽的鏈接功能不受影響
默認(rèn)情況下,瀏覽器會(huì)將 <fieldset disabled> 內(nèi)所有的原生的表單控件(<input>、<select> 和 <button> 元素)設(shè)置為禁用狀態(tài),防止鍵盤(pán)和鼠標(biāo)與他們交互。然而,如果如果表單中還包含 <a ... class="btn btn-*"> 元素,這些元素將只被賦予 pointer-events: none 屬性。正如在關(guān)于禁用狀態(tài)的按鈕章節(jié)中(尤其是關(guān)于錨點(diǎn)元素的子章節(jié)中)所描述的那樣,該 CSS 屬性尚不規(guī)范,并且在 Opera 18 及更低版本的瀏覽器或 Internet Explorer 11 總沒(méi)有得到全面支持,并且不會(huì)阻止鍵盤(pán)用戶(hù)能夠獲取焦點(diǎn)或激活這些鏈接。所以為了安全起見(jiàn),建議使用自定義 Javascript 來(lái)禁用這些鏈接。
跨瀏覽器兼容性
雖然 Bootstrap 會(huì)將這些樣式應(yīng)用到所有瀏覽器上,Internet Explorer 11 及以下瀏覽器中的 <fieldset> 元素并不完全支持 disabled 屬性。因此建議在這些瀏覽器上通過(guò) Javascript 代碼來(lái)禁用<fieldset>。
<!DOCTYPE HTML><html><head><link rel="stylesheet" href="/stylesheets/bootstrap.min.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" > </head><body><form class="form-horizontal" role="form"><div class="form-group"><label for="inputPassword" class="col-sm-2 control-label">禁用</label><div class="col-sm-10"><input class="form-control" id="disabledInput" type="text" placeholder="該輸入框禁止輸入..." disabled></div></div><fieldset disabled><div class="form-group"><label for="disabledTextInput" class="col-sm-2 control-label">禁用輸入(Fieldset disabled)</label><div class="col-sm-10"><input type="text" id="disabledTextInput" class="form-control" placeholder="禁止輸入"></div></div><div class="form-group"><label for="disabledSelect" class="col-sm-2 control-label">禁用選擇菜單(Fieldset disabled)</label><div class="col-sm-10"><select id="disabledSelect" class="form-control"><option>禁止選擇</option></select></div></div></fieldset></form> </body></html>

9.只讀狀態(tài)
為輸入框設(shè)置 readonly 屬性可以禁止用戶(hù)修改輸入框中的內(nèi)容。處于只讀狀態(tài)的輸入框顏色更淺(就像被禁用的輸入框一樣),但是仍然保留標(biāo)準(zhǔn)的鼠標(biāo)狀態(tài)。
<!DOCTYPE HTML><html><head><link rel="stylesheet" href="/stylesheets/bootstrap.min.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" > </head><body><input class="form-control" type="text" placeholder="Readonly input here…" readonly=""></body></html>

10.校驗(yàn)狀態(tài)
Bootstrap 對(duì)表單控件的校驗(yàn)狀態(tài),如 error、warning 和 success 狀態(tài),都定義了樣式。使用時(shí),添加 .has-warning、.has-error 或 .has-success 類(lèi)到這些控件的父元素即可。任何包含在此元素之內(nèi)的.control-label、.form-control 和 .help-block 元素都將接受這些校驗(yàn)狀態(tài)的樣式。
將驗(yàn)證狀態(tài)傳達(dá)給輔助設(shè)備和盲人用戶(hù)
使用這些校驗(yàn)樣式只是為表單控件提供一個(gè)可視的、基于色彩的提示,但是并不能將這種提示信息傳達(dá)給使用輔助設(shè)備的用戶(hù) - 例如屏幕閱讀器 - 或者色盲用戶(hù)。
為了確保所有用戶(hù)都能獲取正確信息,Bootstrap 還提供了另一種提示方式。例如,你可以在表單控件的 <label> 標(biāo)簽上以文本的形式顯示提示信息(就像下面代碼中所展示的);包含一個(gè) Glyphicon 字體圖標(biāo) (還有賦予 .sr-only 類(lèi)的文本信息 - 參考Glyphicon 字體圖標(biāo)實(shí)例);或者提供一個(gè)額外的 輔助信息 塊。另外,對(duì)于使用輔助設(shè)備的用戶(hù),無(wú)效的表單控件還可以賦予一個(gè) aria-invalid="true" 屬性。
<!DOCTYPE HTML><html><head><link rel="stylesheet" href="/stylesheets/bootstrap.min.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" > </head><body><div class="form-group has-success"><label class="control-label" for="inputSuccess1">Input with success</label><input type="text" class="form-control" id="inputSuccess1"></div><div class="form-group has-warning"><label class="control-label" for="inputWarning1">Input with warning</label><input type="text" class="form-control" id="inputWarning1"></div><div class="form-group has-error"><label class="control-label" for="inputError1">Input with error</label><input type="text" class="form-control" id="inputError1"></div><div class="has-success"><div class="checkbox"><label><input type="checkbox" id="checkboxSuccess" value="option1">Checkbox with success</label></div></div><div class="has-warning"><div class="checkbox"><label><input type="checkbox" id="checkboxWarning" value="option1">Checkbox with warning</label></div></div><div class="has-error"><div class="checkbox"><label><input type="checkbox" id="checkboxError" value="option1">Checkbox with error</label></div></div> </body></html>

11.添加額外的圖標(biāo)
你還可以針對(duì)校驗(yàn)狀態(tài)為輸入框添加額外的圖標(biāo)。只需設(shè)置相應(yīng)的 .has-feedback 類(lèi)并添加正確的圖標(biāo)即可。
反饋圖標(biāo)(feedback icon)只能使用在文本輸入框 <input class="form-control"> 元素上。
圖標(biāo)、label 和輸入控件組
對(duì)于不帶有 label 標(biāo)簽的輸入框以及右側(cè)帶有附加組件的輸入框組,需要手動(dòng)為其圖標(biāo)定位。為了讓所有用戶(hù)都能訪問(wèn)你的網(wǎng)站,我們強(qiáng)烈建議為所有輸入框添加 label 標(biāo)簽。如果你不希望將label 標(biāo)簽展示出來(lái),可以通過(guò)添加 .sr-only 類(lèi)來(lái)實(shí)現(xiàn)。如果的確不能添加 label 標(biāo)簽,請(qǐng)調(diào)整圖標(biāo)的 top 值。對(duì)于輸入框組,請(qǐng)根據(jù)你的實(shí)際情況調(diào)整 right 值。
向輔助技術(shù)設(shè)備傳遞圖標(biāo)的含義
為了確保輔助技術(shù)- 如屏幕閱讀器 - 正確傳達(dá)一個(gè)圖標(biāo)的含義,額外的隱藏的文本應(yīng)包含在 .sr-only 類(lèi)中,并明確關(guān)聯(lián)使用了 aria-describedby 的表單控件。或者,以某些其他形式(例如,文本輸入字段有一個(gè)特定的警告信息)傳達(dá)含義,例如改變與表單控件實(shí)際相關(guān)聯(lián)的 <label> 的文本。
雖然下面的例子已經(jīng)提到各自表單控件本身的 <label> 文本的驗(yàn)證狀態(tài),上述技術(shù)(使用 .sr-only 文本 和 aria-describedby) )已經(jīng)包括了需要說(shuō)明的目的。
<!DOCTYPE HTML><html><head><link rel="stylesheet" href="/stylesheets/bootstrap.min.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" > </head><body><div class="form-group has-success has-feedback"><label class="control-label" for="inputSuccess2">Input with success</label><input type="text" class="form-control" id="inputSuccess2" aria-describedby="inputSuccess2Status"><span class="glyphicon glyphicon-ok form-control-feedback" aria-hidden="true"></span><span id="inputSuccess2Status" class="sr-only">(success)</span></div><div class="form-group has-warning has-feedback"><label class="control-label" for="inputWarning2">Input with warning</label><input type="text" class="form-control" id="inputWarning2" aria-describedby="inputWarning2Status"><span class="glyphicon glyphicon-warning-sign form-control-feedback" aria-hidden="true"></span><span id="inputWarning2Status" class="sr-only">(warning)</span></div><div class="form-group has-error has-feedback"><label class="control-label" for="inputError2">Input with error</label><input type="text" class="form-control" id="inputError2" aria-describedby="inputError2Status"><span class="glyphicon glyphicon-remove form-control-feedback" aria-hidden="true"></span><span id="inputError2Status" class="sr-only">(error)</span></div><div class="form-group has-success has-feedback"><label class="control-label" for="inputGroupSuccess1">Input group with success</label><div class="input-group"><span class="input-group-addon">@</span><input type="text" class="form-control" id="inputGroupSuccess1" aria-describedby="inputGroupSuccess1Status"></div><span class="glyphicon glyphicon-ok form-control-feedback" aria-hidden="true"></span><span id="inputGroupSuccess1Status" class="sr-only">(success)</span></div> </body></html>

12.控件尺寸
通過(guò) .input-lg 類(lèi)似的類(lèi)可以為控件設(shè)置高度,通過(guò) .col-lg-* 類(lèi)似的類(lèi)可以為控件設(shè)置寬度。
高度尺寸
創(chuàng)建大一些或小一些的表單控件以匹配按鈕尺寸。
<!DOCTYPE HTML><html><head><link rel="stylesheet" href="/stylesheets/bootstrap.min.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" > </head><body><input class="form-control input-lg" type="text" placeholder=".input-lg"><input class="form-control" type="text" placeholder="Default input"><input class="form-control input-sm" type="text" placeholder=".input-sm"><select class="form-control input-lg">...</select><select class="form-control">...</select><select class="form-control input-sm">...</select> </body></html>

水平排列的表單組的尺寸
通過(guò)添加 .form-group-lg 或 .form-group-sm 類(lèi),為 .form-horizontal包裹的 label 元素和表單控件快速設(shè)置尺寸。
<!DOCTYPE HTML><html><head><link rel="stylesheet" href="/stylesheets/bootstrap.min.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" > </head><body><form class="form-horizontal"><div class="form-group form-group-lg"><label class="col-sm-2 control-label" for="formGroupInputLarge">Large label</label><div class="col-sm-10"><input class="form-control" type="text" id="formGroupInputLarge" placeholder="Large input"></div></div><div class="form-group form-group-sm"><label class="col-sm-2 control-label" for="formGroupInputSmall">Small label</label><div class="col-sm-10"><input class="form-control" type="text" id="formGroupInputSmall" placeholder="Small input"></div></div></form></body></html>

調(diào)整列(column)尺寸
用柵格系統(tǒng)中的列(column)包裹輸入框或其任何父元素,都可很容易的為其設(shè)置寬度。
<!DOCTYPE HTML><html><head><link rel="stylesheet" href="/stylesheets/bootstrap.min.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" > </head><body><div class="row"><div class="col-xs-2"><input type="text" class="form-control" placeholder=".col-xs-2"></div><div class="col-xs-3"><input type="text" class="form-control" placeholder=".col-xs-3"></div><div class="col-xs-4"><input type="text" class="form-control" placeholder=".col-xs-4"></div></div></body></html>

13.輔助文本
針對(duì)表單控件的“塊(block)”級(jí)輔助文本。
與表單控件相關(guān)聯(lián)的幫助文本
與表單控件相關(guān)聯(lián)的幫助文本 aria-describedby 屬性的表單控件關(guān)聯(lián),這將確保使用輔助技術(shù)- 如屏幕閱讀器 - 的用戶(hù)獲取控件焦點(diǎn)或進(jìn)入控制時(shí)顯示這個(gè)幫助文本。
<!DOCTYPE HTML><html><head><link rel="stylesheet" href="/stylesheets/bootstrap.min.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" > </head><body><form role="form"><span>幫助文本實(shí)例</span><input class="form-control" type="text" placeholder=""><span class="help-block">一個(gè)較長(zhǎng)的幫助文本塊,超過(guò)一行,需要擴(kuò)展到下一行。本實(shí)例中的幫助文本總共有兩行。</span></form> <label class="sr-only" for="inputHelpBlock">Input with help text</label><input type="text" id="inputHelpBlock" class="form-control" aria-describedby="helpBlock">...<span id="helpBlock" class="help-block">一塊幫助文本,突破到一個(gè)新的線,可以超越一行。</span> </body></html>

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