布局
使用我们的表单布局选项,为表单提供从内联到水平再到自定义网格实现的一些结构。更新于: 2023-04-30 14:28:21 查看: 384
发布于: 2021-8-31 23:47 发布者: 大米
表单
每组表单字段都应该位于<form>
元素中。Bootstrap没有为元素提供默认<form>
样式,但是默认提供了一些强大的浏览器特性。
-
<button>
在<form>
中默认为type="submit"
,因此要力求具体,并且始终包含一个type
。 - 您可以使用
<form>
上的disabled
属性禁用表单中的每个表单元素。
由于Bootstrap将 display: block
和 width: 100%
应用于我们的几乎所有表单控件,因此表单默认情况下将垂直堆叠。可以使用其他类在每个窗体的基础上更改此布局。
使用工具
页边距实用工具是向表单添加某些结构的最简单方法。它们提供标签、控件、可选表单文本和表单验证消息的基本分组。我们建议使用
margin-bottom
实用工具,并在整个表单中使用单一方向以保持一致性。
您可以随意使用 <fieldset>
、 <div>
或几乎任何其他元素来构建表单。
<div class="mb-3">
<label for="formGroupExampleInput" class="form-label">Example label</label>
<input type="text" class="form-control" id="formGroupExampleInput" placeholder="Example input placeholder">
</div>
<div class="mb-3">
<label for="formGroupExampleInput2" class="form-label">Another label</label>
<input type="text" class="form-control" id="formGroupExampleInput2" placeholder="Another input placeholder">
</div>
网格表单
使用我们的网格类可以构建更复杂的表单。对于需要多个列、不同宽度和其他对齐选项的表单布局,请使用这些选项。
<div class="row">
<div class="col">
<input type="text" class="form-control" placeholder="First name" aria-label="First name">
</div>
<div class="col">
<input type="text" class="form-control" placeholder="Last name" aria-label="Last name">
</div>
</div>
栅格
通过添加栅格类修改器,可以控制中的檐槽宽度以及内嵌块方向。
<div class="row g-3">
<div class="col">
<input type="text" class="form-control" placeholder="First name" aria-label="First name">
</div>
<div class="col">
<input type="text" class="form-control" placeholder="Last name" aria-label="Last name">
</div>
</div>
网格系统也可以创建更复杂的布局。
<div class="row g-3">
<div class="col-md-6">
<label for="inputEmail4" class="form-label">Email</label>
<input type="email" class="form-control" id="inputEmail4">
</div>
<div class="col-md-6">
<label for="inputPassword4" class="form-label">Password</label>
<input type="password" class="form-control" id="inputPassword4">
</div>
<div class="col-12">
<label for="inputAddress" class="form-label">Address</label>
<input type="text" class="form-control" id="inputAddress" placeholder="1234 Main St">
</div>
<div class="col-12">
<label for="inputAddress2" class="form-label">Address 2</label>
<input type="text" class="form-control" id="inputAddress2" placeholder="Apartment, studio, or floor">
</div>
<div class="col-md-6">
<label for="inputCity" class="form-label">City</label>
<input type="text" class="form-control" id="inputCity">
</div>
<div class="col-md-4">
<label for="inputState" class="form-label">State</label>
<select id="inputState" class="form-select">
<option selected>Choose...</option>
<option>...</option>
</select>
</div>
<div class="col-md-2">
<label for="inputZip" class="form-label">Zip</label>
<input type="text" class="form-control" id="inputZip">
</div>
<div class="col-12">
<div class="form-check">
<input class="form-check-input" type="checkbox" id="gridCheck">
<label class="form-check-label" for="gridCheck">
Check me out
</label>
</div>
</div>
<div class="col-12">
<button type="submit" class="btn btn-primary">Sign in</button>
</div>
</div>
横排表单
通过将
.row
类添加到窗体组并使用.col-*-*
类指定标签和控件的宽度,可以创建带有网格的水平窗体。请确保将.col-form-label
也添加到<label>
中,以便它们与相关联的表单控件垂直居中。
<form>
<div class="row mb-3">
<label for="inputEmail3" class="col-sm-2 col-form-label">Email</label>
<div class="col-sm-10">
<input type="email" class="form-control" id="inputEmail3">
</div>
</div>
<div class="row mb-3">
<label for="inputPassword3" class="col-sm-2 col-form-label">Password</label>
<div class="col-sm-10">
<input type="password" class="form-control" id="inputPassword3">
</div>
</div>
<fieldset class="row mb-3">
<legend class="col-form-label col-sm-2 pt-0">Radios</legend>
<div class="col-sm-10">
<div class="form-check">
<input class="form-check-input" type="radio" name="gridRadios" id="gridRadios1" value="option1" checked>
<label class="form-check-label" for="gridRadios1">
First radio
</label>
</div>
<div class="form-check">
<input class="form-check-input" type="radio" name="gridRadios" id="gridRadios2" value="option2">
<label class="form-check-label" for="gridRadios2">
Second radio
</label>
</div>
<div class="form-check disabled">
<input class="form-check-input" type="radio" name="gridRadios" id="gridRadios3" value="option3" disabled>
<label class="form-check-label" for="gridRadios3">
Third disabled radio
</label>
</div>
</div>
</fieldset>
<div class="row mb-3">
<div class="col-sm-10 offset-sm-2">
<div class="form-check">
<input class="form-check-input" type="checkbox" id="gridCheck1">
<label class="form-check-label" for="gridCheck1">
Example checkbox
</label>
</div>
</div>
</div>
<button type="submit" class="btn btn-primary">Sign in</button>
</form>
水平表单标签大小
请确保在
<label>
或<legend>
中使用.col-form-label-sm
或.col-form-label-lg
,以正确遵循.form-control-lg
和.form-control-sm
的大小。
<div class="row mb-3">
<label for="colFormLabelSm" class="col-sm-2 col-form-label col-form-label-sm">Email</label>
<div class="col-sm-10">
<input type="email" class="form-control form-control-sm" id="colFormLabelSm" placeholder="col-form-label-sm">
</div>
</div>
<div class="row mb-3">
<label for="colFormLabel" class="col-sm-2 col-form-label">Email</label>
<div class="col-sm-10">
<input type="email" class="form-control" id="colFormLabel" placeholder="col-form-label">
</div>
</div>
<div class="row">
<label for="colFormLabelLg" class="col-sm-2 col-form-label col-form-label-lg">Email</label>
<div class="col-sm-10">
<input type="email" class="form-control form-control-lg" id="colFormLabelLg" placeholder="col-form-label-lg">
</div>
</div>
列大小调整
如前面的示例所示,我们的网格系统允许您在
.row
中放置任意数量的.col
。它们将在它们之间平均分配可用宽度。您还可以选择列的子集来占用更多或更少的空间,而其余的.col
则使用诸如.col-sm-7
之类的特定列类来平均分割其余的列。
<div class="row g-3">
<div class="col-sm-7">
<input type="text" class="form-control" placeholder="City" aria-label="City">
</div>
<div class="col-sm">
<input type="text" class="form-control" placeholder="State" aria-label="State">
</div>
<div class="col-sm">
<input type="text" class="form-control" placeholder="Zip" aria-label="Zip">
</div>
</div>
自动调整大小
下面的示例使用弹性盒子实用工具将内容垂直居中,并将
.col
更改为.col-auto
,以便列只占用所需的空间。换句话说,列的大小取决于内容
<div class="row gy-2 gx-3 align-items-center">
<div class="col-auto">
<label class="visually-hidden" for="autoSizingInput">Name</label>
<input type="text" class="form-control" id="autoSizingInput" placeholder="Jane Doe">
</div>
<div class="col-auto">
<label class="visually-hidden" for="autoSizingInputGroup">Username</label>
<div class="input-group">
<div class="input-group-text">@</div>
<input type="text" class="form-control" id="autoSizingInputGroup" placeholder="Username">
</div>
</div>
<div class="col-auto">
<label class="visually-hidden" for="autoSizingSelect">Preference</label>
<select class="form-select" id="autoSizingSelect">
<option selected>Choose...</option>
<option value="1">One</option>
<option value="2">Two</option>
<option value="3">Three</option>
</select>
</div>
<div class="col-auto">
<div class="form-check">
<input class="form-check-input" type="checkbox" id="autoSizingCheck">
<label class="form-check-label" for="autoSizingCheck">
Remember me
</label>
</div>
</div>
<div class="col-auto">
<button type="submit" class="btn btn-primary">Submit</button>
</div>
</div>
然后,您可以再次将其与特定大小的列类混合。
<form class="row gx-3 gy-2 align-items-center">
<div class="col-sm-3">
<label class="visually-hidden" for="specificSizeInputName">Name</label>
<input type="text" class="form-control" id="specificSizeInputName" placeholder="Jane Doe">
</div>
<div class="col-sm-3">
<label class="visually-hidden" for="specificSizeInputGroupUsername">Username</label>
<div class="input-group">
<div class="input-group-text">@</div>
<input type="text" class="form-control" id="specificSizeInputGroupUsername" placeholder="Username">
</div>
</div>
<div class="col-sm-3">
<label class="visually-hidden" for="specificSizeSelect">Preference</label>
<select class="form-select" id="specificSizeSelect">
<option selected>Choose...</option>
<option value="1">One</option>
<option value="2">Two</option>
<option value="3">Three</option>
</select>
</div>
<div class="col-auto">
<div class="form-check">
<input class="form-check-input" type="checkbox" id="autoSizingCheck2">
<label class="form-check-label" for="autoSizingCheck2">
Remember me
</label>
</div>
</div>
<div class="col-auto">
<button type="submit" class="btn btn-primary">Submit</button>
</div>
</form>
使用内联表单
.col-auto
类创建水平布局。通过添加 栅格修改器类,我们将在 .align-items-center
和垂直方向上创建栅格。.align
项将表单元素居中对齐,使 .form-checkbox
正确对齐。
<form class="row row-cols-lg-auto g-3 align-items-center">
<div class="col-12">
<label class="visually-hidden" for="inlineFormInputGroupUsername">Username</label>
<div class="input-group">
<div class="input-group-text">@</div>
<input type="text" class="form-control" id="inlineFormInputGroupUsername" placeholder="Username">
</div>
</div>
<div class="col-12">
<label class="visually-hidden" for="inlineFormSelectPref">Preference</label>
<select class="form-select" id="inlineFormSelectPref">
<option selected>Choose...</option>
<option value="1">One</option>
<option value="2">Two</option>
<option value="3">Three</option>
</select>
</div>
<div class="col-12">
<div class="form-check">
<input class="form-check-input" type="checkbox" id="inlineFormCheck">
<label class="form-check-label" for="inlineFormCheck">
Remember me
</label>
</div>
</div>
<div class="col-12">
<button type="submit" class="btn btn-primary">Submit</button>
</div>
</form>