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SASS | @if and @else

  • Last Updated : 11 Oct, 2019

@if, @else, @else-if allows us to control flow in SASS file compilation like JavaScript.

  1. @if: @if block will be compiled if the value of the conditional expression is true.

    Syntax:

    @if <conditional_expression> { ... }

    Example 1: SASS file

    @mixin button-format( $round-button, $size ) {
        color: white;
        background-color: blue;
        width: $size;
    
        @if $round-button {
            height: $size;
            border-radius: $size / 2; 
        }
    }
    
    .mybutton{
        @include button-format(false, 100px);
    }
    

    Example 1: Compiled CSS file



    .mybutton {
      color: white;
      background-color: blue;
      width: 100px;
    }
    

    Example 2: SASS file

    @mixin button-format( $round-button, $size ) {
        color: white;
        background-color: blue;
        width: $size;
    
        @if $round-button {
            height: $size;
            border-radius: $size / 2; 
        }
    }
    
    
    .mybutton{
        @include button-format(true, 100px);
    }
    

    Example 2: Compiled CSS file

    .mybutton {
        color: white;
        background-color: blue;
        width: 100px;
        height: 100px;
        border-radius: 50px;
    }
    
  2. @else: If the values of conditional expressions of all the above @if or @else-if blocks are false, then this block will be compiled.

    Syntax:

    @else { ... }

    SASS file:

    @mixin theme ($theme-decide, $r, $g, $b) {
        // light background
        @if $theme-decide {
            background-color: rgba($r, $g, $b, 0.5);
        }
        // dark background
        @else {
            background-color: rgba($r, $g, $b, 1); // red color
        }
    
    }
    
    .myblock {
        @include theme(false, 255, 0, 0);
    }
    

    Compiled CSS file:

    .myblock {
        background-color: red;
        // if true value is passed then rgba(255, 0, 0, 0.5);
    }
    
  3. @else if: The first @else-if block with conditional expression value true will be compiled. If no @else-if block expression evaluates to true then @else block will be compiled.

    Syntax:

    @else if <conditional_expression> { ... }

    SASS file:

    @mixin theme ($theme-decide, $r, $g, $b) {
        // light background
        @if $theme-decide == 1 {
            background-color: rgba($r, $g, $b, 0.5);
        }
        // medium-dark background
        @else if $theme-decide == 2 {
            background-color: rgba($r, $g, $b, 0.7);
        }
        // dark background
        @else {
            background-color: rgba($r, $g, $b, 1);
        }
    
    }
    
    .myblock {
        @include theme(2, 0, 255, 0);
    }
    

    Compiled CSS file:

    .myblock {
      background-color: rgba(0, 255, 0, 0.7);
    }
    
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