MyJavawebProject/WebContent/scss/bootstrap/_dropdown.scss

这里只显示每个文件的开头 60 行。登录后可以解锁完整代码。

微信扫码关注公众号，代码整理好后第一时间通知你。

// The dropdown wrapper (`<div>`)
.dropup,
.dropdown {
  position: relative;
}

.dropdown-toggle {
  // Generate the caret automatically
  @include caret;
}

// 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: $dropdown-min-width;
  padding: $dropdown-padding-y 0;
  margin: $dropdown-spacer 0 0; // override default ul
  font-size: $font-size-base; // Redeclare because nesting can cause inheritance issues
  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 $dropdown-border-color;
  @include border-radius($dropdown-border-radius);
  @include box-shadow($dropdown-box-shadow);
}

// 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 {
    margin-top: 0;
    margin-bottom: $dropdown-spacer;
  }

  .dropdown-toggle {
    @include caret(up);
  }
}

.dropright {
  .dropdown-menu {
    margin-top: 0;
    margin-left: $dropdown-spacer;
  }

  .dropdown-toggle {
    @include caret(right);
    &::after {
      vertical-align: 0;
    }
  }
}