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HomeWeb Front-endCSS TutorialHow to Use CSS Properties as SASS Mixin Values: A Guide to String Interpolation

How to Use CSS Properties as SASS Mixin Values: A Guide to String Interpolation

Using CSS Properties as SASS Mixin Values

In an attempt to create a versatile margin/padding mixin, you've encountered a snag in SASS. Let's delve into the problem you described and find a solution together.

Setting CSS Properties in Mixins

Your code attempts to set CSS properties (margin and padding) within SASS mixin values. However, there's a key issue: CSS properties cannot be used as mixin values directly. Instead, you need to employ a technique called "string interpolation" to include variables as property names.

Using String Interpolation

String interpolation allows you to insert variable values into strings using the #{$variable} syntax. This helps you set CSS properties dynamically based on variables within mixins.

Here's how you can modify your code to utilize string interpolation:

<code class="sass">[class*="shift"] {
  $sft-o: 10px;

  @mixin shift_stp($val) {
    &[class*="_sml"]{ #{$val}: $sft-o; }
    &[class*="_mid"]{ #{$val}: $sft-o * 2; }
    &[class*="_big"]{ #{$val}: $sft-o * 3; }
  }

  &[class*="_m"]{
    @include shift_stp(margin);
  }

  &[class*="_p"]{
    @include shift_stp(padding);
  }
}</code>

Note on Attribute Selectors

It's important to note that the attribute selector you're using (*="_m") will also match elements with "_mid" in their class names. This might not be the behavior you intended, so consider revising your attribute selector accordingly.

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