1. Summary
I have list of selectors, to which properties should always apply.
For some selectors must be additionally added another properties.
I can't find, how I can do it without duplicates.
2. MCVE
2.1. Expected CSS
.KiraFirst,
.KiraSecond,
.KiraThird {
color: red;
}
.KiraSecond {
background-color: yellow;
}
In example, I use class .KiraSecond 2 times. Can I get expected behavior without this duplicate?
2.2. Stylus
Live demo on stylus-lang.com
.KiraFirst
.KiraSecond
.KiraThird
color red
.KiraSecond
background-color yellow
This is compiled to expected CSS, but I still use .KiraSecond 2 times.
I don't understand, how I can not use duplicate. For example, syntax as this not compile to expected CSS:
.KiraFirst
.KiraSecond
background-color yellow
.KiraThird
color red
Result:
.KiraFirst,
.KiraSecond {
background-color: #ff0;
}
.KiraThird {
color: #f00;
}
3. Not helped
Stylus official documentation include Selectors section
Stack Overflow Stylus questions
Stylus GitHub issues
Maybe you can use basic class for all elements? For example - .Kira and if you need to specify something for other elements you can add extra class .KiraSecond or use .Kira:nth-child(2)
in your example it can be something like this
.Kira {
color: red;
}
.KiraSecond {
background-color: yellow;
}
or
.Kira {
color: red;
}
.Kira:nth-child(2) {
background-color: yellow;
}
You (can't)? and you shouldn't.
Duplicating that selector in that case is not a bad practice.
you are not duplicating the same property/value for many classes
you can clearly override specific property
you can clearly modify/change behaviour for specific class
e.g:
.class1, .class2, .class3 {
color: red;
background: yellow;
border: 1px solid;
}
.class1:hover {
color: blue;
}
.class2 {
border: 2px dotted;
}
.class3 {
color: pink;
}
What would be a bad practice in that case (with no selector duplication)
.class1 {
color: blue;
background: yellow;
border: 1px solid;
}
.class2 {
color: red;
background: yellow;
border: 2px dotted;
}
.class3 {
color: pink;
background: yellow;
border: 1px solid;
}
Related
This question already has answers here:
Sass Nesting for :hover does not work [duplicate]
(2 answers)
Closed 3 years ago.
I have *.scss file in an Angular 7 project.
After compiling it, the compiler adds unwanted whitespace to the css, which leads to wrong results in the UI.
To reproduce the error go to...
https://www.sassmeister.com/
...copy and paste the following code.
$color-background-default: white;
$color-foreground-default: black;
$color-background-disabled: #d3d3d3;
$color-foreground-disabled: #808080;
$color-background-mouseover: #00a7dc;
$color-foreground-mouseover: white;
$color-background-mousedown: #00467F;
$color-foreground-mousedown: white;
.Tab
{
background-color: $color-background-default;
color: $color-foreground-default;
:hover
{
background-color: $color-background-mouseover;
color: $color-foreground-mouseover;
}
:active
{
background-color: $color-background-mousedown;
color: $color-foreground-mousedown;
border-color: $color-background-mousedown;
}
}
In the CSS box of Sassmeister you should see, that there are whitespaces between ".Tab" and "hover" and "active" that look like this:
.Tab {
background-color: white;
color: black;
}
//WHITESPACE AFTER Tab
.Tab :hover {
background-color: #00a7dc;
color: white;
}
//WHITESPACE AFTER Tab
.Tab :active {
background-color: #00467F;
color: white;
border-color: #00467F;
}
Now when I remove the whitespaces between Tab and hover and active it looks like this:
.Tab {
background-color: white;
color: black;
}
//NO WHITESPACE AFTER Tab!
.Tab:hover {
background-color: #00a7dc;
color: white;
}
// NO WHITESPACE AFTER Tab!
.Tab:active {
background-color: #00467F;
color: white;
border-color: #00467F;
}
The second option without whitespaces gives me the correct UI result.
My question: How can I avoid these whitespaces in Angular 7?
The parent selector, &, is a special selector invented by Sass that’s
used in nested selectors to refer to the outer selector. It makes it
possible to re-use the outer selector in more complex ways, like
adding a pseudo-class or adding a selector before the parent.
(from SASS official documentation)
So when you write rules for pseudo-class (before, after, hover, active etc.), to refer to the outer selector (only one level higher), put the ampersand like this:
.link {
color: blue;
&:hover {
color: green;
}
}
So, your SCSS code can be rewritten as:
$color-background-default: white;
$color-foreground-default: black;
$color-background-disabled: #d3d3d3;
$color-foreground-disabled: #808080;
$color-background-mouseover: #00a7dc;
$color-foreground-mouseover: white;
$color-background-mousedown: #00467F;
$color-foreground-mousedown: white;
.Tab
{
background-color: $color-background-default;
color: $color-foreground-default;
&:hover
{
background-color: $color-background-mouseover;
color: $color-foreground-mouseover;
}
&:active
{
background-color: $color-background-mousedown;
color: $color-foreground-mousedown;
border-color: $color-background-mousedown;
}
}
You're looking for the sass ampersand.
.Tab {
:hover {
...
}
}
...should be:
.Tab {
&:hover {
...
}
}
& means: "current selector". You use &:hover to specify
#{currentSelector}:hover.
Without the ampersand, it results into #{currentSelector} :hover and that's the way you want it to work for constructs like
.a {
.b {
...
}
}
... which parses as .a .b {...}.
A more ample explanation here.
Note: the ampersand also allows specifying a prefix to current selector. For example:
.a {
.b {
prop: value;
.c & {
prop: otherValue;
}
}
}
will parse into:
.a .b { prop: value; }
.c .a .b { prop: otherValue; }
I have variables in my css but it isn't recognized.I have tried setting variable like the code below but when I run it in chrome it doesn't work.
li {
border: 2px solid red;
}
:special {
background: yellow;
--col: blue;
}
.completed {
text-decoration: line-through lime;
color: var(--col);
}
but when I set to blue directly it works like that
li {
border: 2px solid red;
}
:special {
background: yellow;
--col: blue;
}
.completed {
text-decoration: line-through lime;
color: blue;
}
I don't understand what is the problem.
:special isn't a recognised selector which is most likely causing your problem here. People tend to add global custom CSS property declarations to the :root {} selector. Or simply scope them to the parent selector that you're using.
:root {
--col: blue;
}
.class-name {
color: var(--col);
}
:special is an invalid selector. Rules in invalid selectors are ignored as per the specification, so your variable is never defined.
I have a link which should display white for 'regular' and hover, and light blue for active.
But it shows purple for 'regular'. Why?
.button {
text-decoration:none;
color: red;
background: purple;
}
.button:hover {
color: white;
background: purple;
}
.button:active {
color: red;
background: purple;
}
.button:visited {
color: purple;
background: purple;
}
text
HTML:
text
CSS:
<style>
.button {
text-decoration:none;
color: red;
background: purple;
}
.button:hover {
color: white;
background: purple;
}
.button:active {
color: red;
background: purple;
}
.button:visited {
color: purple;
background: purple;
}
</style>
If .button is an <A> tag as your CSS suggests you might want to provide styling for the "visited" pseudo class.
See: http://www.w3.org/wiki/CSS/Selectors/pseudo-classes/:visited
Additional Information
The cascading nature of CSS means that the style's order does matter.
Once a URL has been visited, the ":visited" styles will apply.
When you hover over the link, those styles will apply as well.
The priority in which they apply will depend on the order they are in your style sheet.
Note: If you want ":hover" to be dominant (even after visited happens, it should be defined below :visited.
I'm new to LESS and I'm just experimenting with it, using version 1.5. I discovered the useful extend command, but I was wondering if that could be applied to parametric mixins as well as static ones. Apparently, this doesn't seem possible, based on my experiments:
This works
.some-mixin {
}
.child {
&:extend(.some-mixin);
}
This doesn't work and throws an "unexpected token" error:
.some-mixin(#color, #bgcolor) {
color: #color;
background-color: #bgcolor;
}
.child1 {
&:extend(.some-mixin(red, blue));
border: 1px solid blue;
}
.child2 {
&:extend(.some-mixin(red, blue));
border: 1px solid green;
}
.child3 {
&:extend(.some-mixin(red, blue));
border: 1px solid red;
}
Is this a current limitation of LESS, or am I using it incorrectly? Thanks in advance for the answers.
Edit - Added expected output, as per request
What I would expect makes more sense when there are more children extending the parametric mixin:
.child1,
.child2,
.child3 {
color: red;
background-color: blue;
}
.child1 {
border: 1px solid blue;
}
.child2 {
border: 1px solid green;
}
.child3 {
border: 1px solid red;
}
I'm not sure what you are trying to achieve (that is, I am not sure what you expect the :extend() code to actually do if it were extending the parameteric mixin). If your desire is to define the colors of .child, then using it as a straight mixin works:
LESS
.some-mixin(#color, #bgcolor) {
color: #color;
background-color: #bgcolor;
}
.child {
.some-mixin(red, blue);
}
CSS Output
.child {
color: #ff0000;
background-color: #0000ff;
}
This also makes .child itself a mixin for the red and blue color combination, which I think would have been a net result of the extension working if it had worked. That is, I would expect your second set of code to have produced something like this (theoretically; this does not actually work nor is it actually produced in LESS):
.some-mixin(#color, #bgcolor),
.child(#color: red, #bgcolor: blue) {
color: #color;
background-color: #bgcolor;
}
But these two are nearly equivalent as mixins (one has the added parameters):
/* theoretical mixin if extension worked */
.child(#color: red, #bgcolor: blue) {
color: #color;
background-color: #bgcolor;
}
/* code from straight use of .some-mixin in .child */
.child {
color: #ff0000;
background-color: #0000ff;
}
So that either of the above used like so will get the result of mixing in the child values to the new selector:
LESS
.test {
.child; /* or using .child(); */
}
CSS Output
.test {
color: #ff0000;
background-color: #0000ff;
}
No, currently this is not supported. But it's planned to be implemented in future versions.
Hello I am wondering is it possible to do something like this in less. I have this css:
.parent{display: block; color: red; border: yellow 1px solid;}
.parent a, .parent a.special-link{color: blue; border-color: green;}
I would write it in less like this:
.parent{
display: block;
color: red;
border: yellow 1px solid;
a, a.special-link{
color: blue; border-color: green;
}
}
And rules are ok but what if in further developing I have to add something to :hover but only for it eg. padding: 20px; What is the best way to do this? My first thought is that if there is some kind of workaround/hack/selector that allows to inherit all properties of parent.
I doubt I clearly understand your exact needs (":hover" of what? "only" for what "it"?)
But in general it usually goes like this:
.parent {
display: block;
color: red;
border: yellow 1px solid;
a {
// <a> properties:
// ...
&, &.special-link {
// <a> and <a.special-link> properties:
// ...
color: blue;
border-color: green;
}
&.special-link {
// <a.special-link> properties:
// ...
}
&:hover {
// <a:hover> properties:
// ...
}
/// etc. etc. etc.
}
}