Using css next variables globaly - css

I have postcss parser set up with http://cssnext.github.io and am trying to figure out a way to set up a variables.css file to contain all my theme settings.
So far variable.css looks like this with a couple of vars
:root {
--color-white: #FFF;
--color-black: #000;
}
I than import it into my other files where I want to use these variables, so #import './variables.css' or similar and then use it in that file like background-color: var(--color-white) for example, however I get follwoing warning:
variable '--color-white' is undefined and used without a fallback
[postcss-custom-properties]

You can try to install postcss import
$ npm install postcss-import
Check this post for more details how to install.
EDIT
Using postcss-import solved the issue, however there are currently issues with latest version, use v 7.x for stability

Another solution if you want to share your variables with your JavaScript code, is to rely on postcss-custom-properties "variables" options.
Here is an example of a postcss-cssnext config to pass global variables
require("postcss-cssnext")({
features: {
customProperties: {
variables: {
mainColor: "red",
altColor: "blue",
}
}
}
})
https://cssnext.github.io/usage/#features

Related

Can't access global SASS variables from my component

In my Nuxt app I load all my SASS thus:
css: [
'~assets/scss/main.scss'
],
It works perfectly, except when I'm trying to use some SASS variable from within a component.
<style lang="scss">
.container {
background-color: $white;
}
</style>
In this case I get this error message:
SassError: Undefinied variable: $white
Yet, all of the SCSS contained in the SASS file where the variable is defined works throughout the app.
It is as if the app as a whole knew these files, but each individual component doesn't.
What's going on?
Most of the other answers don't take into account that Nuxt.js hides all the Webpack setup and forces you to do everything through nuxt.config.js.
My guess is that Webpack isn't compiling all the SCSS declarations together and therefore can't find the variable.
It's been a few months since I had this issue so things may have changed but here goes...
Make sure you have the correct Node packages installed (Nuxt DID NOT do this by default for me) npm i -D node-sass sass-loader
Add your CSS & SCSS files to the css: [] section of nuxt.config.js Order matters here so make sure things like variables are added before things that use them if you have separate files.
If you're using layouts (I think that's the default Nuxt setup) make sure that layouts/default.vue has a <style lang="sass"></style> block in it. If I remember correctly this can be empty but had to exist. I only have one layout but it may need to exist in all of them.
If all that seems like too much of a pain, there's a Nuxt Plugin that takes most of the work/management out of that process. Nuxt Style Resources Module
The confusing part is that:
styles from scss files CAN be loaded like this
//nuxt.config.js
css: [
'~assets/scss/main.scss'
],
//global scss file
$varcolor: black
h1{background: $varcolor}
BUT
the variables inside CAN NOT be used inside a component
//inside component
.component {background: $varcolor} // DOES NOT WORK
I also suggest the use of the nuxt style resource module:
https://github.com/nuxt-community/style-resources-module
new founded solution, checked and it's work. Founded here
add #nuxtjs/style-resources
export default {
css: [
'vendor.min.css'
],
modules: [
'#nuxtjs/style-resources'
],
//You will have to add this new object if it doesn't exist already
styleResources: {
scss: ['./assets/scss/main.scss'] // here I use only main scss with globally styles (variables, base etc)
},
}
it's strange, but if u change tilda (~) to dot(.), it's help for someone
from css: [ '~assets/scss/main.scss' ] to css: [ './assets/scss/main.scss' ]
this solution finded here
Us should either load the scss in your component
<style lang="sass">
#import 'path/to/your/_variable.scss'; // Using this should get you the variables
.my-color {
color: $primary-color;
}
Or adding the following to you to your vue.config.js
module.exports = {
css: {
loaderOptions: {
sass: {
data: `#import "#/pathto/variables.scss";`
}
}
}
};
Ref:
SassError: Undefinied variable: $white
Each <style lang="scss"> is compiled individually. You need to #import the file which defines $white into your component before the parser knows what $white means.
This is why most frameworks keep their variables in a _variables.scss file which is imported in all the other SCSS files/contexts.
The _variables.scss is not even loaded in the page, because in most cases it doesn't actually contain any rules. It only contains variable definitions which are imported into other .scss files, which output .css.
Ref:
Yet, all of the SCSS contained in the SASS file where the variable is defined works throughout the app.
If you import an SCSS file in your vue.config.js the output will be an ordinary <style> tag. Its contents will be generated at compile/build time and will result into some CSS (which apply to the entire document).
Unless specifically imported into the component SCSS, (using an #import command), the compiler will not know what $white means.
There is an important distinction to make between compilation context and browser context. Compilation happens at compile time (most likely in node-sass). Browser context is the actual browser, which only understands the CSS resulted from compilation.
How does Vue only apply style rules to the parent and not to the children with the same class? That's achieved by scoping.
It means applying a custom data-v-{key} attribute to all selectors in the generated <style> tag and to all elements the style should apply to.
See this example and inspect it using your web console: https://codesandbox.io/s/vue-template-ge2hb
It produces this markup:
As you can see, the scoped CSS has an extra [data-v-763db97b] added to the selector, which means it only applies to elements having that data attribute.

Setting up SCSS color variables won't work

I'd like to define my own color variables in my SCSS, but how?
I checked this website and did everything that is described there.. but it doesn't work.
I have installed a preprocessor already!
Furthermore I tried to create a color-map and access the color with map-get.. doesn't work either.
colors.scss file
$yellow_100: #FFC819;
style.scss file with a colors.scss import
h1 {
color: $yellow_100;
}
I also tried this:
colors.scss file
$colors: (
color: #FFBB00
);
style.scss file
h1 {
color: map-get($colors, color);
}
Neither of them works.
SASS compiler preserves $ in output CSS and doesn't recognize $yellow_100 as a SASS variable. Use Interpolation to access variable's value instead of its name—just put it between #{ and }.
So your code should look like:
$yellow_100: #FFC819;
h1 {
color: #{$yellow_100};
}
Interpolation isn't used in old code examples. That's because SASS developers changed the syntax approximately in July, 2017, making interpolation mandatory for SASS variables. Here is more details on this.
Install sass with npm -g install sass
Create these two source files:
// _colors.scss
$yellow_100: #FFC819;
// style.scss
#import './colors';
h1 {
color: $yellow_100;
}
Execute sass ./style.scss ./output.css to compile your code
Add <link rel="stylesheet" type="text/css" href"[path to output.css]" /> to your HTML
Make sure you're using single colons to prefix your root header tag in your .scss files.
i.e :root{} and not ::root{}

Prettier with CSS settings in VS Code

I have the Prettier extension added to my VS Code editor.
When using Less or Sass, the default settings format code like this:
// Default
.parent_selector {
.child_selector {
color: red;
}
}
// Desired Format
.parent_selector {
.child_selector {
color: red;
}
}
How could I tweak the Prettier CSS settings to achieve this? I know it seems trivial, but in bigger code bases it helps readability.
As an alternative method; It can be achieved by using stylelint plugin and stylelint-config-standard rules.
npm install --save-dev stylelint stylelint-config-standard
After installing them, proceed with ctrl+shift+p on VS Code and run command: stylelint: fix all auto-fixable problems.
PS: Consider assigning a keyboard shortcut for stylelint: fix all auto-fixable problems command for easy access.

Global scss variables for Angular components without importing them everytime

I do already have SCSS variables defined in src/styles/settings/_variables.scss and I am importing them into src/styles.scss, but still these variables aren't available for every single component.
Is there any way to make a global file which holds all SCSS variables for the rest of my components? Because writing #import in every single component .scss file it is very frustrating, especially if I have many nested components.
I know, there is a lot of similar questions, but it seems like they're all outdated and do not relate to the recent versions of Angular.
I use Angular 7.3 with CLI.
You just need to add a little more config, so where you are declaring your global variables, you need to wrap it up in :root{}. So in src/styles/settings/_variables.scss.
:root
{
--blue: #00b; // or any global you wish to share with components
}
Then when you use them in the SCSS you will need to access them like so.
.example-class {
background-color: var(--blue)
}
To add to this regarding comments, this method can use mixins, #media and keyframes and is not limited to just colours / font. That was an example.
From my understanding you need a global file src/assets/style/global and then to import each scss file into there where you are defining them like so.
#import 'filename';
If you dont want global variables to be used in within a component look when you have the globals working. Look into ViewEncapsulation, as this can be used to ignore them.
Is there any ways to make global file with scss variables available for all components?
Without importing global file everytime in each component, you want those sass variables been available, it's not possible.
The way it works in SASS, if using partials to better organize code, you can apply #import directive for referencing. So if there're some sass variables in shared/_variables.scss:
$lightslategray: #778899;
$darkgray: #A9A9A9;
and these variables need to be used in another stylesheet, stylesheet with them must be #import-ed into it firstly:
// Shared
#import "shared/variables";
.content {
background: $lightslategray;
}
In Angular it works in a similar way (related referencing external stylesheet). So if you need some sass variables, mixins or functions to be used by a particular component.scss, there is no other clean way, but to reference them in that component.scss using #import directive. To ease the task, you can create a file src/_variables.scss and use syntax like this in your component.scss:
#import “~variables.scss”;
step one : go to custom scss file (shared/css/_variable.scss) and write this part
:root{
--color-text: red;
--color-btn-success: green;
}
after go to style.scss (this is main file) and import this file :
#import './shared/css/Variables';
now you can use variables in all components with this Syntax:
.sample{
color : var(--color-text);
}
Easily possibe to access sass style(s) from a global file with two steps.
Add folder path of the style files to includePaths array in angular.json file.
Import style file by file-name in any component.
let say your files and folder structures is as follows: src > my-styles-folder > var.scss
angular.json
"architect": {
"build": {
...
"options": {
"stylePreprocessorOptions": {
"includePaths": [
"src/my-styles-folder" // add path only, do not include file name
]
},
"styles": [
...
]
}
...
}
}
some-component.scss
#import "var"; // var.scss
mat-toolbar {
height: $toolbar-height;
}
In angular 8 work for me.
In your _variable.scss file you have to add:
:root{--my-var:#fabada}
After that go in your angular.json and add this in "styles":
{"input":"yourPath/_variables.scss"}

Prevent SCSS from compiling CSS variables - Angular-CLI

I am using Angular5 with sass v1.3.2.
I want to be able to change a color that is used extensively in the scss files of my single page app in runtime (not by compiling new files).
The color is defined globally in my _variables.css as:
$brand: #123123;
And for example used as:
h1 {
color: $brand;
}
I learned that I can modify the color if I am using CSS variables such as:
# CSS
:root {
--brand: #123123
}
#JS
document.documentElement.style.setProperty('--brand', '#456456');
# OR
document.querySelector(':root').style.setProperty('--brand', '#456456');
However to be able to do that using SCSS, I needed to use css-vars mixin as such:
$brand: #123123;
:root {
#include css-vars((
--brand: #{$brand},
));
}
And use it as:
h1 {
color: var(--brand);
}
Two problems:
Actually, still --brand is not showing at root.
Also, the CSS generated in <script type="text/css"> by angular-cli does not have --brand anywhere, it is actually compiling the CSS variable into #123123 so the output is:
h1 {
color: #123123;
}
Any ideas about how can I achieve changing a global color in runtime? Or how to get my CSS in :root and then how to get SASS to not compile it?
UPDATE
As #JonUleis has showed, there is no need for using css-var. Now the var --brand shows in the DOM at :root.
However, now color: var(--brand); line still does not show in the CSS, and h1 doesn't have a color style at all.
After updating node-sass to the latest 4.9.0 from 4.8.3, it worked great.
You're likely on an outdated version of node-sass that wasn't yet compatible with the syntax for CSS custom properties.
Here's your example code compiling successfully using Sassmeister without using the css-vars mixin:

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