Korzystanie wartości graniczne mediów w Bootstrap 4-alfa

Question

W Bootstrap 3 Używam tego:

.something { 
    padding: 5px; 
    @media screen and (min-width: $screen-sm-min) { 
     padding: 20px; 
    } 
    @media screen and (min-width: $screen-md-min) { 
     padding: 40px; 
    } 
} 

Jak mogę zrobić to samo w Boostrap 4-alfa? Nie mogę znaleźć przykładu w ich dokumentach. Jest to variables.scss

$grid-breakpoints: (
    xs: 0, 
    sm: 576px, 
    md: 768px, 
    lg: 992px, 
    xl: 1200px 
) !default; 
@include _assert-ascending($grid-breakpoints, "$grid-breakpoints"); 
@include _assert-starts-at-zero($grid-breakpoints); 

Answer 1

Zastosowanie Breakpoint wstawek jak ten:

.something { 
    padding: 5px; 
    @include media-breakpoint-up(sm) { 
     padding: 20px; 
    } 
    @include media-breakpoint-up(md) { 
     padding: 40px; 
    } 
} 

v4 breakpoints reference

v4 alpha6 breakpoints reference

---

Poniżej pełnych opcji i wartości.

Pułapka & się (przełącz na wartości, a powyżej)

@include media-breakpoint-up(xs) { ... } 
@include media-breakpoint-up(sm) { ... } 
@include media-breakpoint-up(md) { ... } 
@include media-breakpoint-up(lg) { ... } 
@include media-breakpoint-up(xl) { ... } 

punkt przerwania & się wartości:

// Extra small devices (portrait phones, less than 576px) 
// No media query since this is the default in Bootstrap 

// Small devices (landscape phones, 576px and up) 
@media (min-width: 576px) { ... } 

// Medium devices (tablets, 768px and up) 
@media (min-width: 768px) { ... } 

// Large devices (desktops, 992px and up) 
@media (min-width: 992px) { ... } 

// Extra large devices (large desktops, 1200px and up) 
@media (min-width: 1200px) { ... } 

przerwania & dół (włączać wartości i w dół):

@include media-breakpoint-down(xs) { ... } 
@include media-breakpoint-down(sm) { ... } 
@include media-breakpoint-down(md) { ... } 
@include media-breakpoint-down(lg) { ... } 

breakpoi nt & wartości DOWN:

// Extra small devices (portrait phones, less than 576px) 
@media (max-width: 575px) { ... } 

// Small devices (landscape phones, less than 768px) 
@media (max-width: 767px) { ... } 

// Medium devices (tablets, less than 992px) 
@media (max-width: 991px) { ... } 

// Large devices (desktops, less than 1200px) 
@media (max-width: 1199px) { ... } 

// Extra large devices (large desktops) 
// No media query since the extra-large breakpoint has no upper bound on its width 

Breakpoint tylko:

@include media-breakpoint-only(xs) { ... } 
@include media-breakpoint-only(sm) { ... } 
@include media-breakpoint-only(md) { ... } 
@include media-breakpoint-only(lg) { ... } 
@include media-breakpoint-only(xl) { ... } 

Breakpoint tylko wartości (przełączać jedynie między wartościami):

// Extra small devices (portrait phones, less than 576px) 
@media (max-width: 575px) { ... } 

// Small devices (landscape phones, 576px and up) 
@media (min-width: 576px) and (max-width: 767px) { ... } 

// Medium devices (tablets, 768px and up) 
@media (min-width: 768px) and (max-width: 991px) { ... } 

// Large devices (desktops, 992px and up) 
@media (min-width: 992px) and (max-width: 1199px) { ... } 

// Extra large devices (large desktops, 1200px and up) 
@media (min-width: 1200px) { ... } 

Answer 2

I odpowiedział similar question here

Jako @ Syden powiedział, mixins będzie działać. Inną opcją jest użycie Sass map-get tak ..

@media (min-width: map-get($grid-breakpoints, sm)){ 
    .something { 
    padding: 10px; 
    } 
} 

@media (min-width: map-get($grid-breakpoints, md)){ 
    .something { 
    padding: 20px; 
    } 
} 

http://www.codeply.com/go/0TU586QNlV