SASS 和数据属性选择和嵌套 [英] SASS and Data Attribute Selecting and Nesting

问题描述

我想对具有数据属性 product 的元素以及特定产品应用一些样式.

I would like to apply some style to elements with the data attribute product but also to specific products.

有没有办法做这样的事情?

// SASS
[data-product] {
  color: #000;
  &[="red"] {   // <- this line
    color: #f00;
  }
}

推荐答案

在 Sass 3.4 之前，这是根本不可能的.这里的突破性功能是能够将当前选择器存储到一个变量中以及拆分字符串的能力(尽管后者可以通过 SassScript 函数创建).

Prior to Sass 3.4, this is just not possible at all. The deal-breaking features here are the ability to store the current selector into a variable and the ability to split a string (though the later could be created via SassScript functions).

@mixin append-attr($x) {
    $sel: &;
    $collector: ();

    @for $i from 1 through length($sel) {
        $s: nth($sel, $i);
        $last: nth($s, -1);
        @if str-slice($last, -1) == "]" {
            // if is just the bare attribute with no value, $offset will be -1, otherwise it will be -2
            $offset: -1;
            $current-x: $x;

            @if str-slice($last, -2) == '"]' {
                // this attribute already has a value, so we need to adjust the offset
                $offset: -2;
            } @else {
                // no attribute value, so add the equals and quotes
                $current-x: '="' + $x + '"';
            }
            $last: str-slice($last, 1, $offset - 1) + $current-x + str-slice($last, $offset);
            $collector: append($collector, set-nth($s, -1, $last), comma);
        } @else {
            // following line will append $x to your non-attribute selector
            $collector: append($collector, selector-append($s, $x), comma);
            // the following line will not change your non-attribute selector at all
            //$collector: append($collector, $s, comma);
        }
    }

    @at-root #{$collector} {
        @content;
    }
}

用法:

[data-product] {
    color: white;

    @include append-attr("red") {
        color: red;

        @include append-attr('-green') {
            color: green;
        }
    }
}

[one], [two] {
    color: orange;

    @include append-attr('alpha') {
        color: yellow;
    }
}

[test], .test {
    @include append-attr('-one') {
        color: red;
    }
}

.bar input[min] {
    @include append-attr('5') {
        background: yellow;
    }
}

输出:

[data-product] {
  color: white;
}
[data-product="red"] {
  color: red;
}
[data-product="red-green"] {
  color: green;
}

[one], [two] {
  color: orange;
}
[one="alpha"], [two="alpha"] {
  color: yellow;
}

[test="-one"], .test-one {
  color: red;
}

.bar input[min="5"] {
  background: yellow;
}

相关:修改中间Sass 中的选择器(添加/删除类等)

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