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// The dropdown wrapper (`<div>`)
.dropup,
.dropdown {
position: relative;
}
.dropdown-toggle {
// Generate the caret automatically
&::after {
display: inline-block;
width: 0;
height: 0;
margin-right: .25rem;
margin-left: .25rem;
vertical-align: middle;
content: "";
border-top: $caret-width solid;
border-right: $caret-width solid transparent;
border-left: $caret-width solid transparent;
}
// Prevent the focus on the dropdown toggle when closing dropdowns
&:focus {
outline: 0;
}
}
.dropup {
.dropdown-toggle {
&::after {
border-top: 0;
border-bottom: $caret-width solid;
}
}
}
// The dropdown menu
.dropdown-menu {
position: absolute;
top: 100%;
left: 0;
z-index: $zindex-dropdown;
display: none; // none by default, but block on "open" of the menu
float: left;
min-width: 160px;
padding: 5px 0;
margin: 2px 0 0; // override default ul
font-size: $font-size-base;
color: $body-color;
text-align: left; // Ensures proper alignment if parent has it changed (e.g., modal footer)
list-style: none;
background-color: $dropdown-bg;
background-clip: padding-box;
border: $dropdown-border-width solid $dropdown-border-color;
@include border-radius($border-radius);
@include box-shadow($dropdown-box-shadow);
}
// Dividers (basically an `<hr>`) within the dropdown
.dropdown-divider {
@include nav-divider($dropdown-divider-bg);
}
// Links, buttons, and more within the dropdown menu
//
// `<button>`-specific styles are denoted with `// For <button>s`
.dropdown-item {
display: block;
width: 100%; // For `<button>`s
padding: 3px 20px;
clear: both;
font-weight: normal;
line-height: $line-height;
color: $dropdown-link-color;
text-align: inherit; // For `<button>`s
white-space: nowrap; // prevent links from randomly breaking onto new lines
background: none; // For `<button>`s
border: 0; // For `<button>`s
@include hover-focus {
color: $dropdown-link-hover-color;
text-decoration: none;
background-color: $dropdown-link-hover-bg;
}
// Active state
&.active {
@include plain-hover-focus {
color: $dropdown-link-active-color;
text-decoration: none;
background-color: $dropdown-link-active-bg;
outline: 0;
}
}
// Disabled state
//
// Gray out text and ensure the hover/focus state remains gray
&.disabled {
@include plain-hover-focus {
color: $dropdown-link-disabled-color;
}
// Nuke hover/focus effects
@include hover-focus {
text-decoration: none;
cursor: $cursor-disabled;
background-color: transparent;
background-image: none; // Remove CSS gradient
@include reset-filter();
}
}
}
// Open state for the dropdown
.open {
// Show the menu
> .dropdown-menu {
display: block;
}
// Remove the outline when :focus is triggered
> a {
outline: 0;
}
}
// Menu positioning
//
// Add extra class to `.dropdown-menu` to flip the alignment of the dropdown
// menu with the parent.
.dropdown-menu-right {
right: 0;
left: auto; // Reset the default from `.dropdown-menu`
}
// With v3, we enabled auto-flipping if you have a dropdown within a right
// aligned nav component. To enable the undoing of that, we provide an override
// to restore the default dropdown menu alignment.
//
// This is only for left-aligning a dropdown menu within a `.navbar-right` or
// `.pull-right` nav component.
.dropdown-menu-left {
right: auto;
left: 0;
}
// Dropdown section headers
.dropdown-header {
display: block;
padding: 3px 20px;
font-size: $font-size-sm;
line-height: $line-height;
color: $dropdown-header-color;
white-space: nowrap; // as with > li > a
}
// Backdrop to catch body clicks on mobile, etc.
.dropdown-backdrop {
position: fixed;
top: 0;
right: 0;
bottom: 0;
left: 0;
z-index: $zindex-dropdown-backdrop;
}
// Right aligned dropdowns
.pull-right > .dropdown-menu {
right: 0;
left: auto;
}
// Allow for dropdowns to go bottom up (aka, dropup-menu)
//
// Just add .dropup after the standard .dropdown class and you're set.
// TODO: abstract this so that the navbar fixed styles are not placed here?
.dropup,
.navbar-fixed-bottom .dropdown {
// Reverse the caret
.caret {
content: "";
border-top: 0;
border-bottom: $caret-width solid;
}
// Different positioning for bottom up menu
.dropdown-menu {
top: auto;
bottom: 100%;
margin-bottom: 2px;
}
}
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