根据 bootstrap 的设备大小在元素上应用边框

Question

我正在使用 bootstrap 创建移动设备优先的响应式布局，并设置了各种行和列，我根据不同类别的屏幕尺寸进行了调整。

我想知道是否有纯 bootstrap 样式类可以让我应用和删除不同尺寸的边框，而不必创建我自己的 css 媒体查询.

例如，如果我只想在一行中的第一列以中等大小浮动时才在第一列右边框...我知道这不是真正的代码，但是否有相同的影响我太笨了找不到？

<div class="row">
    <div class="col-12 col-md-6 border border-top-0 border-right-0 border-bottom-0 border-left-0 border-md-right-1">
        <p>Lorem ipsum</p>
    </div>
    <div class="col-12 col-md-6">
        <p>Dolor sit amet</p>
    </div>
</div>

我也在使用 maxcdn css，所以无法进入 sass。有什么建议吗？

Answer 1

不，应用和删除边框没有纯 bootstrap 样式类。您必须创建自己的规则来覆盖它们。

Answer 2

Bootstrap 不支持开箱即用的响应式边框。您可以按照此处的说明在 bootstrap - https://github.com/twbs/bootstrap/issues/23892#issuecomment-378172751

中使用响应式边框

代码如下：

@each $breakpoint in map-keys($grid-breakpoints) {
  @include media-breakpoint-up($breakpoint) {
    $infix: breakpoint-infix($breakpoint, $grid-breakpoints);

    .border#{$infix}-top {      border-top: $border-width solid $border-color !important; }
    .border#{$infix}-right {    border-right: $border-width solid $border-color !important; }
    .border#{$infix}-bottom {   border-bottom: $border-width solid $border-color !important; }
    .border#{$infix}-left {     border-left: $border-width solid $border-color !important; }

    .border#{$infix}-top-0 {    border-top: 0 !important; }
    .border#{$infix}-right-0 {  border-right: 0 !important; }
    .border#{$infix}-bottom-0 { border-bottom: 0 !important; }
    .border#{$infix}-left-0 {   border-left: 0 !important; }

    .border#{$infix}-x {
      border-left: $border-width solid $border-color !important;
      border-right: $border-width solid $border-color !important;
    }

    .border#{$infix}-y {
      border-top: $border-width solid $border-color !important;
      border-bottom: $border-width solid $border-color !important;
    }
  }
}

Answer 3

不支持。但添加自己的代码将修复它。基于@sharan 的回答（thx！）如果你想一次定义所有边界，我做了一些修改。原文：

我的 S 版本CSS:

@each $breakpoint in map-keys($grid-breakpoints) {
  @include media-breakpoint-up($breakpoint) {
    $infix: breakpoint-infix($breakpoint, $grid-breakpoints);

    .border#{$infix}-top {      border-top: $border-width solid $border-color !important; }
    .border#{$infix}-right {    border-right: $border-width solid $border-color !important; }
    .border#{$infix}-bottom {   border-bottom: $border-width solid $border-color !important; }
    .border#{$infix}-left {     border-left: $border-width solid $border-color !important; }

    .border#{$infix}-top-0 {    border-top: 0 !important; }
    .border#{$infix}-right-0 {  border-right: 0 !important; }
    .border#{$infix}-bottom-0 { border-bottom: 0 !important; }
    .border#{$infix}-left-0 {   border-left: 0 !important; }

    .border#{$infix}-x {
      border-left: $border-width solid $border-color !important;
      border-right: $border-width solid $border-color !important;
    }

    .border#{$infix}-y {
      border-top: $border-width solid $border-color !important;
      border-bottom: $border-width solid $border-color !important;
    }
    // support of .border-sm (-md, -lg, -xl)
    .border#{$infix} {
      border-top: $border-width solid $border-color !important;
      border-bottom: $border-width solid $border-color !important;
      border-left: $border-width solid $border-color !important;
      border-right: $border-width solid $border-color !important;
    }
    .border#{$infix}-0 {
      border-top: 0 !important;
      border-bottom: 0 !important;
      border-left: 0 !important;
      border-right: 0 !important;
    }
  }
}

我的CSS版本，编译版本：

@media (min-width: 576px) {
  .border-sm-top {
    border-top: 1px solid #e3e7eb !important;
  }
  .border-sm-right {
    border-right: 1px solid #e3e7eb !important;
  }
  .border-sm-bottom {
    border-bottom: 1px solid #e3e7eb !important;
  }
  .border-sm-left {
    border-left: 1px solid #e3e7eb !important;
  }
  .border-sm-top-0 {
    border-top: 0 !important;
  }
  .border-sm-right-0 {
    border-right: 0 !important;
  }
  .border-sm-bottom-0 {
    border-bottom: 0 !important;
  }
  .border-sm-left-0 {
    border-left: 0 !important;
  }
  .border-sm-x {
    border-left: 1px solid #e3e7eb !important;
    border-right: 1px solid #e3e7eb !important;
  }
  .border-sm-y {
    border-top: 1px solid #e3e7eb !important;
    border-bottom: 1px solid #e3e7eb !important;
  }
  .border-sm {
    border-top: 1px solid #e3e7eb !important;
    border-bottom: 1px solid #e3e7eb !important;
    border-left: 1px solid #e3e7eb !important;
    border-right: 1px solid #e3e7eb !important;
  }
  .border-sm-0 {
    border-top: 0 !important;
    border-bottom: 0 !important;
    border-left: 0 !important;
    border-right: 0 !important;
  }
}

@media (min-width: 768px) {
  .border-md-top {
    border-top: 1px solid #e3e7eb !important;
  }
  .border-md-right {
    border-right: 1px solid #e3e7eb !important;
  }
  .border-md-bottom {
    border-bottom: 1px solid #e3e7eb !important;
  }
  .border-md-left {
    border-left: 1px solid #e3e7eb !important;
  }
  .border-md-top-0 {
    border-top: 0 !important;
  }
  .border-md-right-0 {
    border-right: 0 !important;
  }
  .border-md-bottom-0 {
    border-bottom: 0 !important;
  }
  .border-md-left-0 {
    border-left: 0 !important;
  }
  .border-md-x {
    border-left: 1px solid #e3e7eb !important;
    border-right: 1px solid #e3e7eb !important;
  }
  .border-md-y {
    border-top: 1px solid #e3e7eb !important;
    border-bottom: 1px solid #e3e7eb !important;
  }
  .border-md {
    border-top: 1px solid #e3e7eb !important;
    border-bottom: 1px solid #e3e7eb !important;
    border-left: 1px solid #e3e7eb !important;
    border-right: 1px solid #e3e7eb !important;
  }
  .border-md-0 {
    border-top: 0 !important;
    border-bottom: 0 !important;
    border-left: 0 !important;
    border-right: 0 !important;
  }
}

@media (min-width: 992px) {
  .border-lg-top {
    border-top: 1px solid #e3e7eb !important;
  }
  .border-lg-right {
    border-right: 1px solid #e3e7eb !important;
  }
  .border-lg-bottom {
    border-bottom: 1px solid #e3e7eb !important;
  }
  .border-lg-left {
    border-left: 1px solid #e3e7eb !important;
  }
  .border-lg-top-0 {
    border-top: 0 !important;
  }
  .border-lg-right-0 {
    border-right: 0 !important;
  }
  .border-lg-bottom-0 {
    border-bottom: 0 !important;
  }
  .border-lg-left-0 {
    border-left: 0 !important;
  }
  .border-lg-x {
    border-left: 1px solid #e3e7eb !important;
    border-right: 1px solid #e3e7eb !important;
  }
  .border-lg-y {
    border-top: 1px solid #e3e7eb !important;
    border-bottom: 1px solid #e3e7eb !important;
  }
  .border-lg {
    border-top: 1px solid #e3e7eb !important;
    border-bottom: 1px solid #e3e7eb !important;
    border-left: 1px solid #e3e7eb !important;
    border-right: 1px solid #e3e7eb !important;
  }
  .border-lg-0 {
    border-top: 0 !important;
    border-bottom: 0 !important;
    border-left: 0 !important;
    border-right: 0 !important;
  }
}

@media (min-width: 1200px) {
  .border-xl-top {
    border-top: 1px solid #e3e7eb !important;
  }
  .border-xl-right {
    border-right: 1px solid #e3e7eb !important;
  }
  .border-xl-bottom {
    border-bottom: 1px solid #e3e7eb !important;
  }
  .border-xl-left {
    border-left: 1px solid #e3e7eb !important;
  }
  .border-xl-top-0 {
    border-top: 0 !important;
  }
  .border-xl-right-0 {
    border-right: 0 !important;
  }
  .border-xl-bottom-0 {
    border-bottom: 0 !important;
  }
  .border-xl-left-0 {
    border-left: 0 !important;
  }
  .border-xl-x {
    border-left: 1px solid #e3e7eb !important;
    border-right: 1px solid #e3e7eb !important;
  }
  .border-xl-y {
    border-top: 1px solid #e3e7eb !important;
    border-bottom: 1px solid #e3e7eb !important;
  }
  .border-xl {
    border-top: 1px solid #e3e7eb !important;
    border-bottom: 1px solid #e3e7eb !important;
    border-left: 1px solid #e3e7eb !important;
    border-right: 1px solid #e3e7eb !important;
  }
  .border-xl-0 {
    border-top: 0 !important;
    border-bottom: 0 !important;
    border-left: 0 !important;
    border-right: 0 !important;
  }
}

Answer 4

这是所有屏幕尺寸的css

@media (max-width: 575px) {
    .border-top {
        border-top: 1px solid #424242;
    }
    .border-left {
        border-left: 1px solid #424242;
    }
    .border-bottom {
        border-bottom: 1px solid #424242;
    }
    .border-right {
        border-right: 1px solid #424242;
    }
    .border-top-0 {
        border-top: none!important;
    }
    .border-left-0 {
        border-left: none!important;
    }
    .border-bottom-0 {
        border-bottom: none!important;
    }
    .border-right-0 {
        border-right: none!important;
    }
}

@media (min-width: 576px) {
    .border-sm-top {
        border-top: 1px solid #424242;
    }
    .border-sm-left {
        border-left: 1px solid #424242;
    }
    .border-sm-bottom {
        border-bottom: 1px solid #424242;
    }
    .border-sm-right {
        border-right: 1px solid #424242;
    }
    .border-sm-top-0 {
        border-top: none!important;
    }
    .border-sm-left-0 {
        border-left: none!important;
    }
    .border-sm-bottom-0 {
        border-bottom: none!important;
    }
    .border-sm-right-0 {
        border-right: none!important;
    }
}

@media (min-width: 768px) {
    .border-md-top {
        border-top: 1px solid #424242;
    }
    .border-md-left {
        border-left: 1px solid #424242;
    }
    .border-md-bottom {
        border-bottom: 1px solid #424242;
    }
    .border-md-right {
        border-right: 1px solid #424242;
    }
    .border-md-top-0 {
        border-top: none!important;
    }
    .border-md-left-0 {
        border-left: none!important;
    }
    .border-md-bottom-0 {
        border-bottom: none!important;
    }
    .border-md-right-0 {
        border-right: none!important;
    }
}

@media (min-width: 992px) {
    .border-lg-top {
        border-top: 1px solid #424242;
    }
    .border-lg-left {
        border-left: 1px solid #424242;
    }
    .border-lg-bottom {
        border-bottom: 1px solid #424242;
    }
    .border-lg-right {
        border-right: 1px solid #424242;
    }
    .border-lg-top-0 {
        border-top: none!important;
    }
    .border-lg-left-0 {
        border-left: none!important;
    }
    .border-lg-bottom-0 {
        border-bottom: none!important;
    }
    .border-lg-right-0 {
        border-right: none!important;
    }
}

@media (min-width: 1200px) {
    .border-xl-top {
        border-top: 1px solid #424242;
    }
    .border-xl-left {
        border-left: 1px solid #424242;
    }
    .border-xl-bottom {
        border-bottom: 1px solid #424242;
    }
    .border-xl-right {
        border-right: 1px solid #424242;
    }
    .border-xl-top-0 {
        border-top: none!important;
    }
    .border-xl-left-0 {
        border-left: none!important;
    }
    .border-xl-bottom-0 {
        border-bottom: none!important;
    }
    .border-xl-right-0 {
        border-right: none!important;
    }
}

Answer 5

在 Bootstrap5 中，您可以修改实用程序： https://getbootstrap.com/docs/5.1/utilities/api/#enable-responsive

@import "bootstrap/scss/functions";
@import "bootstrap/scss/variables";
@import "bootstrap/scss/utilities";

$utilities: map-merge(
  $utilities, 
  (
    "border": map-merge(
      map-get($utilities, "border"),
      ( responsive: true ),
    ),
    "border-top": map-merge(
      map-get($utilities, "border-top"),
      ( responsive: true ),
    ),
    "border-end": map-merge(
      map-get($utilities, "border-end"),
      ( responsive: true ),
    ),
    "border-bottom": map-merge(
      map-get($utilities, "border-bottom"),
      ( responsive: true ),
    ),
    "border-start": map-merge(
      map-get($utilities, "border-start"),
      ( responsive: true ),
    ),
  )
);

编译后的CSS会像：

  .border-sm {
    border: 1px solid #e9ecef !important;
  }

  .border-sm-0 {
    border: 0 !important;
  }

  .border-top-sm {
    border-top: 1px solid #e9ecef !important;
  }

  .border-top-sm-0 {
    border-top: 0 !important;
  }

  .border-end-sm {
    border-right: 1px solid #e9ecef !important;
  }

  .border-end-sm-0 {
    border-right: 0 !important;
  }

  .border-bottom-sm {
    border-bottom: 1px solid #e9ecef !important;
  }

  .border-bottom-sm-0 {
    border-bottom: 0 !important;
  }

  .border-start-sm {
    border-left: 1px solid #e9ecef !important;
  }

  .border-start-sm-0 {
    border-left: 0 !important;
  }

...continues...

根据 bootstrap 的设备大小在元素上应用边框

Applying borders on elements depending on device size with bootstrap

css

border

media-queries

responsive-design

bootstrap-4