Sass/SCSS Mixin for Clearfix-最佳方法? [英] Sass / SCSS Mixin for Clearfix - best approach?

问题描述

我想从我的HTML中删除clearfix类，并在我的SCSS(Rails 3.1应用程序)中包括一个clearfix mixin.最好的方法是什么?

I want to remove the clearfix class from my HTML and include a clearfix mixin in my SCSS (Rails 3.1 application). What is the best approach to this?

我正在考虑仅将HTML 5 Boilerplate clearfix转换为mixin，然后将其@CSS包含在CSS中，以用于需要clearfixing的元素.

I am thinking of just taking the HTML 5 Boilerplate clearfix and turning it into a mixin, then @including it within the CSS for elements that need clearfixing.

从HTML5样板复制:

Copied from HTML5 Boilerplate:

/* The Magnificent Clearfix: Updated to prevent margin-collapsing on child elements. http://j.mp/bestclearfix */
.clearfix:before, .clearfix:after { content: "\0020"; display: block; height: 0; overflow: hidden; }
.clearfix:after { clear: both; }

/* Fix clearfix: blueprintcss.lighthouseapp.com/projects/15318/tickets/5-extra-margin padding-bottom-of-page */
.clearfix { zoom: 1; }

这有缺点吗?有没有更好的办法?我可以这样安全地从HTML标记中删除clearfix吗?

Is there a drawback to this? Is there a better way? Can I safely remove clearfix from my HTML markup this way?

推荐答案

我应该添加-这是我想出的解决方案.我对这一切仍然很陌生，所以我不知道这是否真的会与将元素的类设置为clearfix并使用上面的HTML5样板代码来完成相同的工作.

I should probably have added - this is the solution I came up with. I am still pretty new to all this so I don't know if this will actually do the same job as setting an element's class to clearfix and using the HTML5 boilerplate code above.

@mixin clearfix {
    zoom:1;
    &:before, &:after {
        content: "\0020"; 
        display: block; 
        height: 0; 
        overflow: hidden; 
    }
    &:after {
        clear: both;
    }
}

修改: 最好使用@extend而不是mixin，因为它会产生少得多的CSS代码. 同样，在使用@extend时使用静默类(用%表示)也很有用.这样可以防止意外的CSS规则，并消除了您所使用的规则直接不使用扩展.

It's best to use @extend instead of a mixin as it will produce much less CSS code. Also, it's useful to use a silent class (denoted by %) when using @extend. This prevents unexpected CSS rules and eliminates the rule you're extending if it's not being used directly.

%clearfix {
    zoom:1;
    &:before, &:after {
        content: "\0020";
        display: block;
        height: 0;
        overflow: hidden;
    }
    &:after {
        clear: both;
    }
}

#head {
    @extend %clearfix;
    padding: 45px 0 14px; margin: 0 35px 0;
    border-bottom: 1px solid $border;
}

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