如何动态调用mixin?
用例可能是生成样式指南:
// The mixin which should be called
.typography-xs(){
font-family: Arial;
font-size: 16px;
line-height: 22px;
}
// The mixin which tries to call typography-xs
.typography-demo(@typographyName, @mixinName) {
@{typographyName} {
&:before{content: '@{typographyName}';}
// Calling the mixin dynamically
@mixinName();
}
}
// Example call of .typograhpy-demo
.typography-demo(xs, typography-xs);
这样的动态调用是否可以用更少的CSS进行?
答案 0 :(得分:7)
您目前无法根据需要动态调用。但是,您可以使用pattern matching稍微不同地设置它,如下所示:
// The mixin which should be called
.typography(xs){
font-family: Arial;
font-size: 16px;
line-height: 22px;
}
// The mixin which tries to call typography-xs
.typography-demo(@typographyName) {
@{typographyName} {
&:before{content: '@{typographyName}';}
// Calling the mixin dynamically
.typography(@typographyName);
}
}
// Example call of .typograhpy-demo
.typography-demo(xs);
使用模式匹配,您可以创建其他模式,例如:
.typography(xl){
font-family: Arial;
font-size: 32px;
line-height: 44px;
}
.typography(times){
font-family: 'Times New Roman';
font-size: 16px;
line-height: 22px;
}
现在,您可以调用模式xl
或times
并让它生成代码。从本质上讲,取连字符后的所有内容(如-xs
)来区分各种排版组,并删除连字符并使用该名称作为模式以匹配mixin。
此外,我还会添加一种方法,将选择器放在@{typographyName}
之前,如下所示:
.typography-demo(@typographyName, @selector: ~".") {
@{selector}@{typographyName} {
&:before{content: '@{typographyName}';}
// Calling the mixin dynamically
.typography(@typographyName);
}
}
这种方式默认情况下会生成一个类,但可以创建一个id或任何选择器字符串,直到@{typographyName}
。