巢狀元件(Nested components)

<div class='article-link'>
  <div class='vote-box'>
    ...
  </div>
  <h3 class='title'>...</h3>
  <p class='meta'>...</p>
</div>

Sometimes it's necessary to nest components. Here are some guidelines for doing that.

Variants

A component may need to appear a certain way when nested in another component. Avoid modifying the nested component by reaching into it from the containing component.

.article-header {
  > .vote-box > .up { /* ✗ avoid this */ }
}

Instead, prefer to add a variant to the nested component and apply it from the containing component.

<div class='article-header'>
  <div class='vote-box -highlight'>
    ...
  </div>
  ...
</div>

.vote-box {
  &.-highlight > .up { /* ... */ }
}

Simplifying nested components

Sometimes, when nesting components, your markup can get dirty:

<div class='search-form'>
  <input class='input' type='text'>
  <button class='search-button -red -large'></button>
</div>

You can simplify this by using your CSS preprocessor's @extend mechanism:

<div class='search-form'>
  <input class='input' type='text'>
  <button class='submit'></button>
</div>

.search-form {
  > .submit {
    @extend .search-button;
    @extend .search-button.-red;
    @extend .search-button.-large;
  }
}

What about repeating elements like lists? Learn about Layouts. Continue →