bootstrap之input-group&label样式

一、前言

二、源码

1、input-groups.less

//
// Input groups
// --------------------------------------------------

// Base styles
// -------------------------
.input-group {
position: relative; // For dropdowns
display: table;
border-collapse: separate; // prevent input groups from inheriting border styles from table cells when placed within a table

// Undo padding and float of grid classes
&[class*="col-"] {
float: none;
padding-left: 0;
padding-right: 0;
}

.form-control {
// Ensure that the input is always above the *appended* addon button for
// proper border colors.
position: relative;
z-index: 2;

// IE9 fubars the placeholder attribute in text inputs and the arrows on
// select elements in input groups. To fix it, we float the input. Details:
// https://github.com/twbs/bootstrap/issues/11561#issuecomment-28936855 float: left;

width: 100%;
margin-bottom: 0;

&:focus {
z-index: 3;
}
}
}

// Sizing options
//
// Remix the default form control sizing classes into new ones for easier
// manipulation.

.input-group-lg > .form-control,
.input-group-lg > .input-group-addon,
.input-group-lg > .input-group-btn > .btn {
.input-lg();
}
.input-group-sm > .form-control,
.input-group-sm > .input-group-addon,
.input-group-sm > .input-group-btn > .btn {
.input-sm();
}

// Display as table-cell
// -------------------------
.input-group-addon,
.input-group-btn,
.input-group .form-control {
display: table-cell;

&:not(:first-child):not(:last-child) {
border-radius: 0;
}
}
// Addon and addon wrapper for buttons
.input-group-addon,
.input-group-btn {
width: 1%;
white-space: nowrap;
vertical-align: middle; // Match the inputs
}

// Text input groups
// -------------------------
.input-group-addon {
padding: @padding-base-vertical @padding-base-horizontal;
font-size: @font-size-base;
font-weight: normal;
line-height: 1;
color: @input-color;
text-align: center;
background-color: @input-group-addon-bg;
border: 1px solid @input-group-addon-border-color;
border-radius: @input-border-radius;

// Sizing
&.input-sm {
padding: @padding-small-vertical @padding-small-horizontal;
font-size: @font-size-small;
border-radius: @input-border-radius-small;
}
&.input-lg {
padding: @padding-large-vertical @padding-large-horizontal;
font-size: @font-size-large;
border-radius: @input-border-radius-large;
}

// Nuke default margins from checkboxes and radios to vertically center within.
input[type="radio"],
input[type="checkbox"] {
margin-top: 0;
}
}

// Reset rounded corners
.input-group .form-control:first-child,
.input-group-addon:first-child,
.input-group-btn:first-child > .btn,
.input-group-btn:first-child > .btn-group > .btn,
.input-group-btn:first-child > .dropdown-toggle,
.input-group-btn:last-child > .btn:not(:last-child):not(.dropdown-toggle),
.input-group-btn:last-child > .btn-group:not(:last-child) > .btn {
.border-right-radius(0);
}
.input-group-addon:first-child {
border-right: 0;
}
.input-group .form-control:last-child,
.input-group-addon:last-child,
.input-group-btn:last-child > .btn,
.input-group-btn:last-child > .btn-group > .btn,
.input-group-btn:last-child > .dropdown-toggle,
.input-group-btn:first-child > .btn:not(:first-child),
.input-group-btn:first-child > .btn-group:not(:first-child) > .btn {
.border-left-radius(0);
}
.input-group-addon:last-child {
border-left: 0;
}

// Button input groups
// -------------------------
.input-group-btn {
position: relative;
// Jankily prevent input button groups from wrapping with `white-space` and
// `font-size` in combination with `inline-block` on buttons.
font-size: 0;
white-space: nowrap;

// Negative margin for spacing, position for bringing hovered/focused/actived
// element above the siblings.
> .btn {
position: relative;
+ .btn {
margin-left: -1px;
}
// Bring the "active" button to the front
&:hover,
&:focus,
&:active {
z-index: 2;
}
}

// Negative margin to only have a 1px border between the two
&:first-child {
> .btn,
> .btn-group {
margin-right: -1px;
}
}
&:last-child {
> .btn,
> .btn-group {
z-index: 2;
margin-left: -1px;
}
}
}

<!--输入框组(使用 table 布局，使得 input 宽度为 100%)-->
<div style="padding: 100px 100px 10px;">
<form class="bs-example bs-example-form" role="form">
<div class="input-group input-group-lg">
<span class="input-group-addon">@</span>
<input type="text" class="form-control" placeholder="twitterhandle">
</div>
<br>
<div class="input-group">
<input type="text" class="form-control">
<span class="input-group-addon">.00</span>
</div>
<br>
<div class="input-group input-group-sm">
<span class="input-group-addon">$</span>
<input type="text" class="form-control">
<span class="input-group-addon">.00</span>
</div>
<br>
<!--复选框-->
<div class="input-group">
<span class="input-group-addon">
<input type="checkbox">
</span>
<input type="text" class="form-control">
</div>
<br>
<!--单选框-->
<div class="input-group">
<span class="input-group-addon">
<input type="radio">
</span>
<input type="text" class="form-control">
</div>
<br>
<!--按钮-->
<div class="input-group">
<input type="text" class="form-control">
<span class="input-group-btn">
<button class="btn btn-default" type="button">Go!</button>
</span>
</div>
<br>
<!--带有下拉菜单的按钮-->
<div class="input-group">
<input type="text" class="form-control">
<div class="input-group-btn">
<button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown">
下拉菜单<span class="caret"></span>
</button>
<ul class="dropdown-menu pull-right">
<li>
<a href="#">功能</a>
</li>
<li>
<a href="#">另一个功能</a>
</li>
<li>
<a href="#">其他</a>
</li>
<li class="divider"></li>
<li>
<a href="#">分离的链接</a>
</li>
</ul>
</div>
</div>
<br>
<!--分割的下拉菜单按钮-->
<div class="input-group">
<input type="text" class="form-control">
<div class="input-group-btn">
<button type="button" class="btn btn-default" tabindex="-1">下拉菜单</button>
<button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown" tabindex="-1">
<span class="caret"></span>
<span class="sr-only">切换下拉菜单</span>
</button>
<ul class="dropdown-menu pull-right">
<li>
<a href="#">功能</a>
</li>
<li>
<a href="#">另一个功能</a>
</li>
<li>
<a href="#">其他</a>
</li>
<li class="divider"></li>
<li>
<a href="#">分离的链接</a>
</li>
</ul>
</div>
</div>
</form>
</div>

2、labels.less

//
// Labels(标签)
// --------------------------------------------------
.label {
display: inline;
padding: .2em .6em .3em;
font-size: 75%;
font-weight: bold;
line-height: 1;
color: @label-color;
text-align: center;
white-space: nowrap;
vertical-align: baseline;
border-radius: .25em;

// Add hover effects, but only for links
a& {
&:hover,
&:focus {
color: @label-link-hover-color;
text-decoration: none;
cursor: pointer;
}
}

// Empty labels collapse automatically (not available in IE8)
&:empty {
display: none;
}

// Quick fix for labels in buttons
.btn & {
position: relative;
top: -1px;
}
}

// Colors
// Contextual variations (linked labels get darker on :hover)

.label-default {
.label-variant(@label-default-bg);
}

.label-primary {
.label-variant(@label-primary-bg);
}

.label-success {
.label-variant(@label-success-bg);
}

.label-info {
.label-variant(@label-info-bg);
}

.label-warning {
.label-variant(@label-warning-bg);
}

.label-danger {
.label-variant(@label-danger-bg);
}

<span class="label label-default">默认标签</span>
<span class="label label-primary">主要标签</span>
<span class="label label-success">成功标签</span>
<span class="label label-info">信息标签</span>
<span class="label label-warning">警告标签</span>
<span class="label label-danger">危险标签</span>