导轨,引导程序,仅媒体断点 [英] rails, bootstrap, media-breakpoint-only
问题描述
我花了整整一天的时间试图在没有找到明确说明的情况下使bootstrap仅在媒体断点处工作.
I have spent a day on the web trying to get bootstrap's media-breakpoint-only working without finding clear instructions.
我有引导程序导航栏,所以我怀疑引导程序安装正确.
I have the bootstrap navbar working so, I suspect, I have bootstrap installed correctly.
我想使以下代码正常工作:
I want to get the following code working:
h1 {
@include media-breakpoint-only(xs) {
color: red;
}
@include media-breakpoint-only(sm) {
color: green;
}
@include media-breakpoint-only(md) {
color: blue;
}
@include media-breakpoint-only(lg) {
color: yellow;
}
@include media-breakpoint-only(xl) {
color: orange;
}
}
但是我不知道在哪里放置这段代码,或者我需要做些其他的事情来使仅媒体断点工作.
but I haven't a clue where to put this code or what additional things I need to do to get media-breakpoint-only working.
将上面的代码放在application.scss的末尾(见下文)时,出现以下错误:
When I put the above code at the end of application.scss (see below), I get the following error:
未定义的mixin'仅限媒体断点'.
Undefined mixin 'media-breakpoint-only'.
我的Gemfile是
source 'https://rubygems.org'
git_source(:github) { |repo| "https://github.com/#{repo}.git" }
ruby '2.5.1'
# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '~> 5.2.0'
# Use postgresql as the database for Active Record
gem 'pg', '>= 0.18', '< 2.0'
# Use Puma as the app server
gem 'puma', '~> 3.11'
# Use SCSS for stylesheets
gem 'sass-rails', '~> 5.0'
# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.3.0'
# See https://github.com/rails/execjs#readme for more supported runtimes
# gem 'mini_racer', platforms: :ruby
# Shnelvar
gem 'jquery-rails'
# Use CoffeeScript for .coffee assets and views
gem 'coffee-rails', '~> 4.2'
# Turbolinks makes navigating your web application faster. Read more: https://github.com/turbolinks/turbolinks
gem 'turbolinks', '~> 5'
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 2.5'
# Use Redis adapter to run Action Cable in production
# gem 'redis', '~> 4.0'
# Use ActiveModel has_secure_password
# gem 'bcrypt', '~> 3.1.7'
# Use ActiveStorage variant
# gem 'mini_magick', '~> 4.8'
# Use Capistrano for deployment
# gem 'capistrano-rails', group: :development
# Reduces boot times through caching; required in config/boot.rb
gem 'bootsnap', '>= 1.1.0', require: false
group :development, :test do
# Call 'byebug' anywhere in the code to stop execution and get a debugger console
gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]
end
group :development do
# Access an interactive console on exception pages or by calling 'console' anywhere in the code.
gem 'web-console', '>= 3.3.0'
gem 'listen', '>= 3.0.5', '< 3.2'
# Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
gem 'spring'
gem 'spring-watcher-listen', '~> 2.0.0'
end
group :test do
# Adds support for Capybara system testing and selenium driver
gem 'capybara', '>= 2.15', '< 4.0'
gem 'selenium-webdriver'
# Easy installation and use of chromedriver to run system tests with Chrome
gem 'chromedriver-helper'
end
# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
gem 'bootstrap-sass', '~> 3.3', '>= 3.3.7'
gem 'bootstrap', '~> 4.1.3'
application.js
application.js
// This is a manifest file that'll be compiled into application.js, which will include all the files
// listed below.
//
// Any JavaScript/Coffee file within this directory, lib/assets/javascripts, or any plugin's
// vendor/assets/javascripts directory can be referenced here using a relative path.
//
// It's not advisable to add code directly here, but if you do, it'll appear at the bottom of the
// compiled file. JavaScript code in this file should be added after the last require_* statement.
//
// Read Sprockets README (https://github.com/rails/sprockets#sprockets-directives) for details
// about supported directives.
//
//= require jquery
//= require rails-ujs
// Shnelvar
// From https://github.com/rails/jquery-rails
// If you are running Rails 5.1 and up, and if you have included //= require rails-ujs, then jquery_ujs is not needed anymore. You can just add:
// require jquery_ujs
//= require activestorage
//= require turbolinks
//= require_tree .
// Shnelvar
// See https://github.com/twbs/bootstrap-rubygem
//= require jquery3
//= require popper
//= require bootstrap-sprockets
application.scss
application.scss
/*
* This is a manifest file that'll be compiled into application.css, which will include all the files
* listed below.
*
* Any CSS and SCSS file within this directory, lib/assets/stylesheets, or any plugin's
* vendor/assets/stylesheets directory can be referenced here using a relative path.
*
* You're free to add application-wide styles to this file and they'll appear at the bottom of the
* compiled file so the styles you add here take precedence over styles defined in any other CSS/SCSS
* files in this directory. Styles in this file should be added after the last require_* statement.
* It is generally better to create a new file per style scope.
*
* require_tree .
* require_self
*/
// See
// https://www.youtube.com/watch?v=vcBXXOdPfgE&index=8&list=PLYM1n9xxMy4ClO2GjX73U3BLsXx9Z7wh5
$navbar-default-bg: red;
// Shnelvar
// See https://github.com/twbs/bootstrap-sass
@import "bootstrap-sprockets";
// Custom bootstrap variables must be set or imported *before* bootstrap.
@import "bootstrap";
// Shnelvar
// For ralph-shiny-button etc.
@import "ralph";
// Shnelvar
// See https://stackoverflow.com/questions/33404154/bootstrap-change-the-navbar-font-size
// See https://teamtreehouse.com/community/how-do-you-change-the-bootstrap-font-style
.nav a{
color: white !important;
// font-size: 3.8em !important;
font-size: 2.8em;
}
推荐答案
最可能是因为您在自己的样式表之后 导入了引导样式表.可见,application.css
文件中的* require_tree .
意味着您从app/assets/stylesheets
导入了所有样式表,因此会出现错误,因为那时引导程序的混合尚不可用.
It's most likely because you import bootstrap stylesheets after your own stylesheets. See, * require_tree .
in application.css
file means that you import all your stylesheets from app/assets/stylesheets
, so you get an error, because at that time bootstrap's mixins were not available yet.
要修复此问题,例如,我建议创建一个全局样式表文件. app/assets/stylesheets/main.scss
,您将以正确的顺序导入所有内容.
To fix it, I would recommend creating a global stylesheets file, for example. app/assets/stylesheets/main.scss
, where you would import everything in a correct order.
// app/assets/stylesheets/main.scss
$navbar-default-bg: red;
@import "bootstrap-sprockets"
@import "bootstrap"
@import "some-file" // import specific file from app/assets/stylesheets/
@import "some-dir/*" // import whole directory from app/assets/stylesheets/
// any other styles here
并且在application.css
中仅保留:
/*
* This is a manifest file that'll be compiled into application.css, which will include all the files
* listed below.
*
* Any CSS and SCSS file within this directory, lib/assets/stylesheets, or any plugin's
* vendor/assets/stylesheets directory can be referenced here using a relative path.
*
* You're free to add application-wide styles to this file and they'll appear at the bottom of the
* compiled file so the styles you add here take precedence over styles defined in any other CSS/SCSS
* files in this directory. Styles in this file should be added after the last require_* statement.
* It is generally better to create a new file per style scope.
*
* require main
* require_self
*/
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