Less.js Misc default() Function
Less.js is a simple CSS pre-processor that facilitates the creation of manageable, customizable, and reusable style sheets for websites. Since CSS is a dynamic style sheet language, it is preferred. LESS is adaptable, so it works with a wide range of browsers. Only CSS that has been created and processed using the CSS pre-processor, a computer language, can be used by web browsers. In addition to providing capabilities like variables, functions, mixins, and operations to help create dynamic CSS while maintaining backward compatibility, it is a CSS language extension.
In this article, we are going to discuss the Misc default() function, which can be used only inside guard conditions. It returns a “true” value if no other mixin matched the conditions and “false” if any other matches. By default, it has a “true” value and it is used to give a true valued condition as an alternative. When the default function is used outside of the mixin guard condition, it is treated as standard CSS.
Syntax:
default()
Please refer to the Compile LESS code into CSS code. article for a detailed description of an installation procedure.
Example 1: The code below demonstrates the usage and implementation of the Misc default() function and parametric mixin.
HTML
<!DOCTYPE html> < html > < head > < link rel = "stylesheet" type = "text/css" href = "style.css" /> </ head > < body > < h1 style = "color:green" >w3wiki</ h1 > < h3 >Less.js Misc default() Function</ h3 > < div class = "c1" > < p > < strong > .mixin(@p, @color) when (default()) < br >.mixin(@param, @light); </ strong > </ p > </ div > </ body > </ html > |
style.less:
CSS
@body-bg- color : #eeeeee ; @dark: hsl( 25 , 71% , 8% ); @light: rgb ( 253 , 255 , 146 ); @param: italic ; .mixin(@p, @color) when ( default ()) { font-style : @p; color : @color; } body { background-color : @body-bg-color; } .c 1 { width : 400px ; height : 200px ; margin : 1 rem; background-color : @dark; } p { padding : 60px 0px 0px 80px ; .mixin(@param, @light); } |
Now, to compile the above LESS code to CSS code, run the following command:
lessc style.less style.css
style.css: The compiled CSS file comes to be:
CSS
body { background-color : #eeeeee ; } .c 1 { width : 400px ; height : 200px ; margin : 1 rem; background-color : hsl( 25 , 71% , 8% ); } p { padding : 60px 0px 0px 80px ; font-style : italic ; color : #fdff92 ; } |
Output:
Example 2: The code below demonstrates the usage and implementation of the Misc default() function and usage of the multiple default() stage.
HTML
<!DOCTYPE html> < html > < head > < link rel = "stylesheet" type = "text/css" href = "style.css" /> </ head > < body > < h1 style = "color:green" >w3wiki</ h1 > < h3 >Less.js Misc default() Function</ h3 > < div class = "box" > < div class = "c1" > < p class = "p1" > < strong > .mixin(@color) when (iscolor(@color)) < br > and (default()) </ strong > </ p > </ div > < div class = "c2" > < p class = "p2" > < strong > .mixin(@pix) when (ispixel(@pix)) < br >and (default()) </ strong > </ p > </ div > </ div > </ body > </ html > |
style.less:
CSS
@body-bg- color : #eeeeee ; @dark: hsl( 25 , 71% , 8% ); @light: rgb ( 253 , 255 , 146 ); @w: 300px ; .mixin(@color) when (iscolor(@color)) and ( default ()) { color : @dark; } .mixin(@pix) when (ispixel(@pix)) and ( default ()) { color : @light; } body { background-color : @body-bg-color; } .box { display : flex; } .c 1 { width : @w; height : 200px ; margin : 1 rem; background-color : @light; } .c 2 { width : @w; height : 200px ; margin : 1 rem; background-color : @dark; } .p 1 { padding : 60px 0px 0px 80px ; .mixin(@light); } .p 2 { padding : 60px 0px 0px 80px ; .mixin(@w); } |
Now, to compile the above LESS code to CSS code, run the following command:
lessc style.less style.css
style.css: The compiled CSS file comes to be:
CSS
body { background-color : #eeeeee ; } .box { display : flex; } .c 1 { width : 300px ; height : 200px ; margin : 1 rem; background-color : #fdff92 ; } .c 2 { width : 300px ; height : 200px ; margin : 1 rem; background-color : hsl( 25 , 71% , 8% ); } .p 1 { padding : 60px 0px 0px 80px ; color : hsl( 25 , 71% , 8% ); } .p 2 { padding : 60px 0px 0px 80px ; color : #fdff92 ; } |
Output:
Reference: https://lesscss.org/functions/#misc-functions-default