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Bootstrap/scss/_dropdown.scss

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// The dropdown wrapper (`<div>`)
.dropup,
.dropend,
.dropdown,
.dropstart,
.dropup-center,
.dropdown-center {
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position: relative;
}
.dropdown-toggle {
white-space: nowrap;
// Generate the caret automatically
@include caret();
}
// The dropdown menu
.dropdown-menu {
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// scss-docs-start dropdown-css-vars
--#{$prefix}dropdown-min-width: #{$dropdown-min-width};
--#{$prefix}dropdown-padding-x: #{$dropdown-padding-x};
--#{$prefix}dropdown-padding-y: #{$dropdown-padding-y};
--#{$prefix}dropdown-spacer: #{$dropdown-spacer};
@include rfs($dropdown-font-size, --#{$prefix}dropdown-font-size);
--#{$prefix}dropdown-color: #{$dropdown-color}; // stylelint-disable-line custom-property-empty-line-before
--#{$prefix}dropdown-bg: #{$dropdown-bg};
--#{$prefix}dropdown-border-color: #{$dropdown-border-color};
--#{$prefix}dropdown-border-radius: #{$dropdown-border-radius};
--#{$prefix}dropdown-border-width: #{$dropdown-border-width};
--#{$prefix}dropdown-inner-border-radius: #{$dropdown-inner-border-radius};
--#{$prefix}dropdown-divider-bg: #{$dropdown-divider-bg};
--#{$prefix}dropdown-divider-margin-y: #{$dropdown-divider-margin-y};
--#{$prefix}dropdown-box-shadow: #{$dropdown-box-shadow};
--#{$prefix}dropdown-link-color: #{$dropdown-link-color};
--#{$prefix}dropdown-link-hover-color: #{$dropdown-link-hover-color};
--#{$prefix}dropdown-link-hover-bg: #{$dropdown-link-hover-bg};
--#{$prefix}dropdown-link-active-color: #{$dropdown-link-active-color};
--#{$prefix}dropdown-link-active-bg: #{$dropdown-link-active-bg};
--#{$prefix}dropdown-link-disabled-color: #{$dropdown-link-disabled-color};
--#{$prefix}dropdown-item-padding-x: #{$dropdown-item-padding-x};
--#{$prefix}dropdown-item-padding-y: #{$dropdown-item-padding-y};
--#{$prefix}dropdown-header-color: #{$dropdown-header-color};
--#{$prefix}dropdown-header-padding-x: #{$dropdown-header-padding-x};
--#{$prefix}dropdown-header-padding-y: #{$dropdown-header-padding-y};
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// scss-docs-end dropdown-css-vars
position: absolute;
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z-index: $zindex-dropdown;
display: none; // none by default, but block on "open" of the menu
min-width: var(--#{$prefix}dropdown-min-width);
padding: var(--#{$prefix}dropdown-padding-y) var(--#{$prefix}dropdown-padding-x);
margin: 0; // Override default margin of ul
@include font-size(var(--#{$prefix}dropdown-font-size));
color: var(--#{$prefix}dropdown-color);
text-align: left; // Ensures proper alignment if parent has it changed (e.g., modal footer)
list-style: none;
background-color: var(--#{$prefix}dropdown-bg);
background-clip: padding-box;
border: var(--#{$prefix}dropdown-border-width) solid var(--#{$prefix}dropdown-border-color);
@include border-radius(var(--#{$prefix}dropdown-border-radius));
@include box-shadow(var(--#{$prefix}dropdown-box-shadow));
&[data-bs-popper] {
top: 100%;
left: 0;
margin-top: var(--#{$prefix}dropdown-spacer);
}
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}
// scss-docs-start responsive-breakpoints
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// We deliberately hardcode the `bs-` prefix because we check
// this custom property in JS to determine Popper's positioning
@each $breakpoint in map-keys($grid-breakpoints) {
@include media-breakpoint-up($breakpoint) {
$infix: breakpoint-infix($breakpoint, $grid-breakpoints);
.dropdown-menu#{$infix}-start {
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--bs-position: start;
&[data-bs-popper] {
right: auto;
left: 0;
}
}
.dropdown-menu#{$infix}-end {
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--bs-position: end;
&[data-bs-popper] {
right: 0;
left: auto;
}
}
}
}
// scss-docs-end responsive-breakpoints
// Allow for dropdowns to go bottom up (aka, dropup-menu)
// Just add .dropup after the standard .dropdown class and you're set.
.dropup {
.dropdown-menu[data-bs-popper] {
top: auto;
bottom: 100%;
margin-top: 0;
margin-bottom: var(--#{$prefix}dropdown-spacer);
}
.dropdown-toggle {
@include caret(up);
}
}
.dropend {
.dropdown-menu[data-bs-popper] {
top: 0;
right: auto;
left: 100%;
margin-top: 0;
margin-left: var(--#{$prefix}dropdown-spacer);
}
.dropdown-toggle {
@include caret(end);
&::after {
vertical-align: 0;
}
}
}
.dropstart {
.dropdown-menu[data-bs-popper] {
top: 0;
right: 100%;
left: auto;
margin-top: 0;
margin-right: var(--#{$prefix}dropdown-spacer);
}
.dropdown-toggle {
@include caret(start);
&::before {
vertical-align: 0;
}
}
}
// Dividers (basically an `<hr>`) within the dropdown
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.dropdown-divider {
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height: 0;
margin: var(--#{$prefix}dropdown-divider-margin-y) 0;
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overflow: hidden;
border-top: 1px solid var(--#{$prefix}dropdown-divider-bg);
opacity: 1; // Revisit in v6 to de-dupe styles that conflict with <hr> element
}
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// Links, buttons, and more within the dropdown menu
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//
// `<button>`-specific styles are denoted with `// For <button>s`
.dropdown-item {
display: block;
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width: 100%; // For `<button>`s
padding: var(--#{$prefix}dropdown-item-padding-y) var(--#{$prefix}dropdown-item-padding-x);
clear: both;
font-weight: $font-weight-normal;
color: var(--#{$prefix}dropdown-link-color);
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text-align: inherit; // For `<button>`s
text-decoration: if($link-decoration == none, null, none);
white-space: nowrap; // prevent links from randomly breaking onto new lines
background-color: transparent; // For `<button>`s
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border: 0; // For `<button>`s
// Prevent dropdown overflow if there's no padding
// See https://github.com/twbs/bootstrap/pull/27703
@if $dropdown-padding-y == 0 {
&:first-child {
@include border-top-radius(var(--#{$prefix}dropdown-inner-border-radius));
}
&:last-child {
@include border-bottom-radius(var(--#{$prefix}dropdown-inner-border-radius));
}
}
&:hover,
&:focus {
color: var(--#{$prefix}dropdown-link-hover-color);
text-decoration: if($link-hover-decoration == underline, none, null);
@include gradient-bg(var(--#{$prefix}dropdown-link-hover-bg));
}
&.active,
&:active {
color: var(--#{$prefix}dropdown-link-active-color);
text-decoration: none;
@include gradient-bg(var(--#{$prefix}dropdown-link-active-bg));
}
&.disabled,
&:disabled {
color: var(--#{$prefix}dropdown-link-disabled-color);
pointer-events: none;
background-color: transparent;
// Remove CSS gradients if they're enabled
background-image: if($enable-gradients, none, null);
}
}
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.dropdown-menu.show {
display: block;
}
// Dropdown section headers
.dropdown-header {
display: block;
padding: var(--#{$prefix}dropdown-header-padding-y) var(--#{$prefix}dropdown-header-padding-x);
margin-bottom: 0; // for use with heading elements
@include font-size($font-size-sm);
color: var(--#{$prefix}dropdown-header-color);
white-space: nowrap; // as with > li > a
}
// Dropdown text
.dropdown-item-text {
display: block;
padding: var(--#{$prefix}dropdown-item-padding-y) var(--#{$prefix}dropdown-item-padding-x);
color: var(--#{$prefix}dropdown-link-color);
}
// Dark dropdowns
.dropdown-menu-dark {
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// scss-docs-start dropdown-dark-css-vars
--#{$prefix}dropdown-color: #{$dropdown-dark-color};
--#{$prefix}dropdown-bg: #{$dropdown-dark-bg};
--#{$prefix}dropdown-border-color: #{$dropdown-dark-border-color};
--#{$prefix}dropdown-box-shadow: #{$dropdown-dark-box-shadow};
--#{$prefix}dropdown-link-color: #{$dropdown-dark-link-color};
--#{$prefix}dropdown-link-hover-color: #{$dropdown-dark-link-hover-color};
--#{$prefix}dropdown-divider-bg: #{$dropdown-dark-divider-bg};
--#{$prefix}dropdown-link-hover-bg: #{$dropdown-dark-link-hover-bg};
--#{$prefix}dropdown-link-active-color: #{$dropdown-dark-link-active-color};
--#{$prefix}dropdown-link-active-bg: #{$dropdown-dark-link-active-bg};
--#{$prefix}dropdown-link-disabled-color: #{$dropdown-dark-link-disabled-color};
--#{$prefix}dropdown-header-color: #{$dropdown-dark-header-color};
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// scss-docs-end dropdown-dark-css-vars
}