secretformula secretformula - 3 months ago 17
Sass (Sass) Question

Calc Element in Sass CSS

I am working on a sass stylesheet in which I wish to use the

calc
element to dynamically size some content. As the
calc
element has not been standardized, I need to target
calc()
,
-moz-calc()
, and
-webkit-calc()
.

Is there a way for me to create a mixin or function that I can pass an expression to so that it will generate the required tags that can then be set as a
width
or
height
.

Answer

It would be a basic mixin with an argument, thankfully the expressions are not browser-specific within the supported scope:

@mixin calc($property, $expression) {
  #{$property}: -webkit-calc(#{$expression});
  #{$property}: calc(#{$expression});
}

.test {
  @include calc(width, "25% - 1em");
}

Will render as

.test {
  width: -webkit-calc(25% - 1em);
  width: calc(25% - 1em);
}

You may want to include a "default" value for when calc is not supported.

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