[SCSS] Write similar classes with the SCSS @for Control Directive
2024-09-29 21:23:22
Writing similar classes with minor variations, like utility classes, can be a pain to write and update. Sometimes just a single character is the only difference between classes and updating the defining parameter means we need to change it for every class name and value. We can write a class one time and the @for directive can write all the minor variations for us. If the similar classes need to be updated, with the help of the @for directive, they only need to be updated once. In this lesson we learn how to leverage the power of the SCSS @for control directive to relieve the pain.
Basic @for-to loop in SCSS:
// doesn't include 10
@for $i from 1 to 10 {
.order {
order: $i;
}
}
output:
.order {
order:; } .order {
order:; }
...
.order {
order:; }
@for-through:
// includes 5
@for $x from 1 through 5 {
.level {
z-index: $x;
}
}
output:
.level {
z-index:; } ... .level {
z-index:; }
@for with 'if' condition:
@for $i from 0 through 10 {
$value: .5 * $i;
$has-decimal: floor($value) != $value;
$class-name: if(
$has-decimal,
#{$value - 0.5}pt5, // if true
$value // if false
); .mt-#{$class-name} {
margin-top: #{$value}rem;
}
}
output:
.mt-0 {
margin-top: 0rem; } .mt-0pt5 {
margin-top: 0.5rem; } .mt-1 {
margin-top: 1rem; } .mt-1pt5 {
margin-top: 1.5rem; } .. .mt-5 {
margin-top: 5rem; }
Using attr selector:
@for $i from 0 through 10 {
$value: .5 * $i; [class~="mt-#{$value}"] {
margin-top: #{$value}rem;
}
}
output:
[class~="mt-0"] {
margin-top: 0rem; } [class~="mt-0.5"] {
margin-top: 0.5rem; } [class~="mt-1"] {
margin-top: 1rem; } .. [class~="mt-5"] {
margin-top: 5rem; }
@for with @mixin
@mixin light-color-class($color, $color-name,$i) {
$color-value: if($i == 0, $color, lighten($color, 5% * $i)); .#{$color-name}#{$i} {
color: $color-value;
}
} @for $i from 0 through 5 {
@include light-color-class(red, 'passion', $i);
@include light-color-class(green, 'natural', $i);
@include light-color-class(blue, 'cool', $i);
}
output:
.passion0 {
color: red; } .natural0 {
color: green; } .cool0 {
color: blue; } .passion1 {
color: #ff1a1a; } .natural1 {
color: #009a00; } .cool1 {
color: #1a1aff; } ...
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