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How to Achieve Property Name Interpolation in LESS?

Mary-Kate Olsen
Release: 2024-11-08 13:08:02
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How to Achieve Property Name Interpolation in LESS?

How can we replicate this behavior in LESS with the unique capabilities like e() and @{ }?

Using Variables in Property Names in LESS

In LESS, property name interpolation is not directly supported. However, there are workarounds using parametric mixins and pattern matching:

Workaround 1: Injecting Properties into a Value

.vendors(@property, @value, @pre: ect) {
    -inj:~"@{pre}; -webkit-@{property}: @{value}; -moz-@{property}: @{value}; -ms-@{property}: @{value}; -o-@{property}: @{value}; @{property}: @{value}";
}
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Usage:

.test-class{
    .vendors(transform, matrix(1,0,0,1,20,20));
    .vendors(transform-origin,"10px 10px");
}
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Workaround 2: Injecting Properties into the Class Name

As of v1.3.3

.vendors(@property, @value, @rest:"") {
    @inject:~"@{rest} -webkit-@{property}: @{value}; -moz-@{property}: @{value}; -ms-@{property}: @{value}; -o-@{property}: @{value}; @{property}: @{value};";
}
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.test(@nextclass){
    .vendors(transform, "matrix(2,0,0,2,20,20)");
    .vendors(transform-origin,"10px 10px", @inject);
    (~"{@{inject}} .@{nextclass}"){/*next class properties*/};
}
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Wrap it in a class:

.this-class{
    .test(next-class);
}
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Workaround 3: Recursive Injection (v1.4.0)

@nl: `"\n\t"`; 

.multi(@props,@vals,1,@inj) {
    @property: extract(@props, 1);
    @value: extract(@vals, 1);
    @inject:~"@{inj}@{nl}-webkit-@{property}: @{value};@{nl}-moz-@{property}: @{value};@{nl}-ms-@{property}: @{value};@{nl}-o-@{property}: @{value};@{nl}@{property}: @{value};";
}

.multi(@props,@vals,@i,@inj:"") when (@i > 0) {
    @property: extract(@props, @i);
    @value: extract(@vals, @i);
    @injnext:~"@{inj}@{nl}-webkit-@{property}: @{value};@{nl}-moz-@{property}: @{value};@{nl}-ms-@{property}: @{value};@{nl}-o-@{property}: @{value};@{nl}@{property}: @{value};";
    .multi(@props,@vals,(@i - 1),@injnext);
}
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Usage:

// properties and values for vendors
@properties: "transform-origin" "transform";
@values: "10px 10px" "matrix(2,0,0,2,20,20)";

.this-class {
    .multi(@properties,@values,2,@p);
    @inj: ~"{@{inject}`'\n'`} `'\n'`.next-class ";
    @{inj} {/**/}
}
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