I have two <p> and one <button> that extend a certain class named test. I want to know if it is possible to add certain style rules to .test and then specific rules for the element type?
I thought of something like this:
.test {
font-weight: bold;
color: blue;
&p {
font-size: 26px;
}
&button {
font-size: 20px;
}
}
I know it is impossible to write it like that. This example is only for a concept example.
I've read the documentation and alas i found nothing...
Any idea or is this just impossible to achieve?
If I understand correctly you should use :extend:
LESS:
.test {
font-weight: bold;
color: blue;
}
p:extend(.test) {
font-size: 26px;
}
button:extend(.test){
font-size: 20px;
}
Output:
.test, p, button {
font-weight: bold;
color: blue;
}
p {
font-size: 26px;
}
button {
font-size: 20px;
}
Related
How would you define a CSS style (e.g. font-size: 20px), and reuse it in multiple places with LESS?
According to the LESS docs, I can use variables for keys (e.g. font-size), identifiers (e.g. .myClass), and values (e.g. 20px). However, I'm not seeing an ability to do general rules like this.
Example in SCSS:
Define a mixin
#mixin large-text {
font-size: 20px;
}
Use it elsewhere
.MyAwesomeTitle {
color: red;
#include large-text;
}
Result:
.MyAwesomeTitle {
color: red;
font-size: 20px;
}
Define the mixin. While the leading . makes it look like a class selector, it's just how naming mixins works in LESS.
.large-text() {
font-size: 20px;
}
You include a mixin by just writing the name of the mixin. In this case it's .large-text.
.MyAwesomeTitle {
color: red;
.large-text
}
The docs give an example under "parametric mixins"
Input:
.wrap() {
text-wrap: wrap;
white-space: -moz-pre-wrap;
white-space: pre-wrap;
word-wrap: break-word;
}
pre { .wrap }
Output:
pre {
text-wrap: wrap;
white-space: -moz-pre-wrap;
white-space: pre-wrap;
word-wrap: break-word;
}
I am looking for an online tool, command line tool, or Windows application to convert flat selector rules to nested in a LESS file.
Before:
#header {
color: black;
}
#header .navigation {
font-size: 12px;
}
#header .logo {
width: 300px;
}
After:
#header {
color: black;
.navigation {
font-size: 12px;
}
.logo {
width: 300px;
}
}
You can use CSS 2 LESS:
Pasting your CSS code in left pane, you'll obtain the following LESS on the right one:
#header {
color: black;
.navigation {
font-size: 12px;
}
.logo {
width: 300px;
}
}
that is exactly what do you expect
I have the following definition:
.f-color {
.a {color: #000000;}
.b {color: #ffffff;}
}
.f-type {
._36 {
font-family: Arial;
font-size: 36px;
}
._24 {
font-family: Arial;
font-size: 24px;
}
}
I want to create mixin that will look like this:
.a_36 {
color: #000000;
font-family: #font-omnes-light;
font-size: 36px;
}
I tried the following function:
.buildForColor(a);
.buildForColor(b);
.buildForColor(#c){
.#{c}_36 {
.f-color > .#{c};
.f-type > ._36;
}
}
But I'm getting an error with the line: .f-color > .#{c};
How can I pass the letter "a" so it will look like: .f-color > .a;
Thanks in advance
I found other way to define it:
In variables.less I defined:
#main_color_a: #000000;
#main_color_b: #ffffff;
Then in the mixin.less I defined:
.f-type {
._36 {
font-family: Arial;
font-size: 36px;
}
._24 {
font-family: Arial;
font-size: 24px;
}
}
.buildForColor(a);
.buildForColor(b);
.buildForColor(#c){
.#{c}_36 {
color: ~"#{main_color_#{c}}";
.f-type > ._36;
}
}
The compiled css looks like this:
.a_36 {
color: #000000;
font-family: Arial;
font-size: 36px;
}
.b_36 {
color: #ffffff;
font-family: Arial;
font-size: 36px;
}
I have a LESS mixin. When I apply this to an element I want it be styled slightly differently if a body class is present.
This:
.mixin() {
font-weight: bold;
color: red;
}
.element {
.mixin()
}
Outputs to this:
.element {
font-weight: bold;
color: red;
}
But I also want this to be outputted:
.body-class .element {
color: blue;
}
You can define your mixin this way:
.mixin() {
font-weight: bold;
color: red;
.body-class & {
color: blue;
}
}
When using LESS, i found usefull to mix classes, in order to create a new class based on other class properties, but sometimes i need to override them.
like:
.btn {
border-radius: 10px;
background-color: blue;
font-size:10px;
}
.btn_warning {
.btn;
background-color: yellow;
font-size: 12px;
}
The output has duplicated properties:
.btn {
border-radius: 10px;
background-color: blue;
font-size:10px;
}
.btn_warning {
border-radius: 10px;
background-color: blue;
font-size:10px;
background-color: yellow;
font-size: 12px;
}
I know there are multiple aproaches for this, like multiple classes on dom, or even #extend to build multiple selectors, but navigator still overriding at runtime the properties.
Is there any reason to duplicate same properties when mixin? Seems a simple way for making "independent" groups of properties, but not nice if has duplicated values.
LESS does not account for removal of duplicate properties within a block, at least in part because of this reason stated here (quote slightly modified for grammar fix):
The trouble is that people frequently use multiple properties in order
to provide a fallback for older browsers. Removing the properties is
not something that it would be good to do generically.
It is left up to the programmer to not program it for duplication. You can set up a basic mixin like what Danny Kijkov noted in his answer, or...
Solution #1 (Complex, but Powerful to Fully Define)
You can get elaborate in building a master button maker mixin. Something like this:
LESS (Mixin)
.makeBtn(#ext: null; #rad: 10px; #color: blue; #size: 10px;) {
.set-extension() when (#ext = null) {
#class-extension: ~'';
}
.set-extension() when not (#ext = null) {
#class-extension: ~'_#{ext}';
}
.set-extension();
.btn#{class-extension} {
border-radius: #rad;
background-color: #color;
font-size: #size;
//define various addtions based on extensions here
.specialExtensionProps() when (#ext = danger) {
border: 3px solid red;
}
.specialExtensionProps() when (#ext = someExtName) {
my-special-prop: yep;
}
.specialExtensionProps();
}
}
LESS (Use the Mixin Various Ways)
.makeBtn(); //makes base button
.makeBtn(warning; #color: yellow; #size: 12px); //makes modified button
.makeBtn(danger; #color: red;); //makes modified button
.makeBtn(someExtName, 15px); //makes modified button
CSS Output
.btn {
border-radius: 10px;
background-color: #0000ff;
font-size: 10px;
}
.btn_warning {
border-radius: 10px;
background-color: #ffff00;
font-size: 12px;
}
.btn_danger {
border-radius: 10px;
background-color: #ff0000;
font-size: 10px;
border: 3px solid red;
}
.btn_someExtName {
border-radius: 15px;
background-color: #0000ff;
font-size: 10px;
my-special-prop: yep;
}
In case you did not know, note the above demonstrated LESS functionality of setting only some variables from the set of mixin variables. So for the first two specialized .makeBtn() calls, I only set a few variables, out of order from the mixin, by explicitly calling the variable name to set (e.g. #color: yellow). This allows me to "skip" over setting the #size. In the last example, I was only setting the first two values, so I did not need to put any variable names.
I don't know if the above helps you get what you want, but it does offer a different way of being able to reduce code size.
Solution #2
You mentioned :extend(), which could be well used here to avoid duplication:
LESS
.btn {
border-radius: 10px;
background-color: blue;
font-size:10px;
}
.btn_warning {
&:extend(.btn);
background-color: yellow;
font-size: 12px;
}
CSS Output
.btn,
.btn_warning {
border-radius: 10px;
background-color: blue;
font-size: 10px;
}
.btn_warning {
background-color: yellow;
font-size: 12px;
}
Solution #3
In your case, if all the buttons will be of either class .btn or a .btn_SOMETHING form, and you are not using .btn_ for anything else but buttons, then you might be able to just use the CSS cascade to apply styles and prevent duplication of CSS code like so (no special LESS required):
LESS and CSS Output
.btn, [class *= btn_] {
border-radius: 10px;
background-color: blue;
font-size:10px;
}
.btn_warning {
background-color: yellow;
font-size: 12px;
}
Any html with the class btn_warning will first get the base button styles from the attribute selector [class *= btn_] while the actual btn_warning class will override the things set to be overridden.
Solution #4
If you split the class names in the html (so class="btn warning" rather than class="btn_warning"), then this works to avoid duplication:
LESS and CSS Output
.btn {
border-radius: 10px;
background-color: blue;
font-size:10px;
}
.btn.warning {
background-color: yellow;
font-size: 12px;
}
What about this solution?
.btn(#size: 10px, #color:blue) {
border-radius: 10px;
background-color: #color;
font-size:#size;
}
.btn_warning {
.btn(12px, yellow);
}