Assessing the value of a variable or expression embedded within a string in Sass

Creating a mixin to set a div to transparent requires special attention to evaluate a variable in a string. The -ms-filter line must be quoted and should include the result of a calculation ($amount * 100). How can I successfully incorporate this into my mixin?

@mixin transparent( $amount: .7, $color: black ) {
    background: $color;
    -ms-filter: progid:"DXImageTransform.Microsoft.Alpha(Opacity=$amount * 100)";
    filter: alpha(opacity= $amount * 100);
    opacity: $amount;
}

Answer №1

To make sure the variable or expression is evaluated, you must use interpolation in Sass. Otherwise, Sass will treat it as regular string content:

@mixin makeTransparent( $amount: .7, $color: black ) {
    background: $color;
    -ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=#{$amount * 100})";
    filter: alpha(opacity= $amount * 100);
    opacity: $amount;
}

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