LESS中的多个选择器

问题描述

我使用以下代码使用LESS CSS生成列布局：

I am using the following code to generate a column layout using LESS CSS:

.columnBuilder (@index) when (@index =< @columnCount) {

  .container_@{columnCount} .grid_@{index}  {
    width: unit(((@baseWidth / @columnCount) * @index)-10, px);
  }

  .columnBuilder(@index + 1);
}

这给了我一个输出：

.container_24 .grid_1 {
  width: 69px;
}
.container_24 .grid_2 {
  width: 148px;
}
.container_24 .grid_3 {
  width: 227px;
}

etc...

创建一个新的更少的函数，其将给出输出：

How would i now create a new less function that would give an output of:

.grid_1,
.grid_2,
....,
.grid_N {
  display: inline;
  float: left;
  margin-left: 5px;
  margin-right: 5px;
}

其中 N 定义为 @columnCount：24; ，尽管列计数未设置，它可以更改为任何数字。我知道我可以为每个 grid_X 创建一个主体，以避免它保持杂乱。

Where N is defined as @columnCount: 24;, though the column count is not set, it can be changed to any number. I am aware i could create a body for each grid_X would like to avoid it to keep clutter down.

推荐答案

在LESS 1.4中使用：extend（） +

它更优雅。你首先在硬编码的 .grid_1 类中定义要扩展的初始值（目前，LESS不会扩展动态生成的类），然后在你的循环扩展到该类。像这样：

Using :extend() in LESS 1.4+

This seems to accomplish it more elegantly. You first define the initial values you will want extended in a hard coded .grid_1 class (at present, LESS will not extend dynamically generated classes), then add an extender mixin in your loop to extend to that class. Like so:

.grid_1 { //this acts as the "launch point" for extending them all
    display: inline;
    float: left;
    margin-left: 5px;
    margin-right: 5px;
}

.columnBuilder (@index) when (@index =< @columnCount) {
  //we are going to use this class twice, so just calculate it once
  @gridClass: ~'.grid_@{index}';
  //this is your original code except the variable now used for the grid class
  .container_@{columnCount} @{gridClass} {
    width: unit(((@baseWidth / @columnCount) * @index)-10, px);
  }
  //this is your extender feature, which does not do so for the initial .grid_1
  //which was set above as our launch point.
  @{gridClass} {
    .extender() when (@index > 1) {
      &:extend(.grid_1 all);
    }
    .extender() when (@index = 1) {}
    .extender();
  }
  //iterate the loop just as you were doing
  .columnBuilder(@index + 1);
}
//call the loop starting at 1
.columnBuilder(1);

输出是您的预期：

.grid_1,
.grid_2,
....,
.grid_N {
  display: inline;
  float: left;
  margin-left: 5px;
  margin-right: 5px;
}

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