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<a href="index.html" >Susy</a> »
<strong>Grid Functions</strong>
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<div data-page="api">
<section class="item" >
<div data-item-section="prose" class="text-block">
<h1 id="susy3-api-functions">Susy3 API Functions</h1>
<p>These three functions form the core of Susy’s
layout-building grid<span class="widont"> </span>API.</p>
<ul>
<li>Use <code>span()</code> and <code>gutter()</code> to return any grid-width,
and apply the results wherever you need them:
CSS <code>width</code>, <code>margin</code>, <code>padding</code>, <code>flex-basis</code>, <code>transform</code>, etc.</li>
<li>For asymmetrical-fluid grids,
<code>slice()</code> can help manage your nesting<span class="widont"> </span>context.</li>
</ul>
<p>All three functions come with an unprefixed alias by default,
using the <code>susy</code> import.
Import the <code>susy-prefix</code> partial instead,
if you only only want prefixed versions of the<span class="widont"> </span>API.</p>
<p>This is a thin syntax-sugar shell around
the “Su” core-math functions: <code>su-span</code>, <code>su-gutter</code>, and <code>su-slice</code>.
If you prefer the more constrained syntax of the math engine,
you are welcome to use those functions<span class="widont"> </span>instead.</p>
</div>
<div data-item-section="related">
<h3 class="item-subtitle">
<span class="item-subtitle-main">Related</span>
</h3>
<div class="param-list">
<h4 class="param-title">
<span class="item-type">@function</span>
<a href="
api.html#function--susy-span" class="item-name">susy-span()</a>
</h4>
</div>
<div class="param-list">
<h4 class="param-title">
<span class="item-type">@function</span>
<a href="
api.html#function--susy-gutter" class="item-name">susy-gutter()</a>
</h4>
</div>
<div class="param-list">
<h4 class="param-title">
<span class="item-type">@function</span>
<a href="
api.html#function--susy-slice" class="item-name">susy-slice()</a>
</h4>
</div>
<div class="param-list">
<h4 class="param-title">
<span class="item-type">@function</span>
<a href="
su-math.html#function--su-span" class="item-name">su-span()</a>
</h4>
</div>
<div class="param-list">
<h4 class="param-title">
<span class="item-type">@function</span>
<a href="
su-math.html#function--su-gutter" class="item-name">su-gutter()</a>
</h4>
</div>
<div class="param-list">
<h4 class="param-title">
<span class="item-type">@function</span>
<a href="
su-math.html#function--su-slice" class="item-name">su-slice()</a>
</h4>
</div>
</div>
</section>
<section class="item" >
<div data-item-section="prose" class="text-block">
<h2 id="shorthand">Shorthand</h2>
<p>All functions draw on the same shorthand syntax in two parts,
seperated by the word <code>of</code>.</p>
<h3 id="span-syntax-width-location-spread-">Span Syntax: <code><width></code> [<code><location></code> <code><spread></code>]</h3>
<p>The first part describes the
<strong>span</strong> width, location, and spread in any order.
Only the width is<span class="widont"> </span>required:</p>
<ul>
<li><code>span(2)</code> will return the width of 2<span class="widont"> </span>columns.</li>
<li><code>span(3 wide)</code> will return 3-columns, with an additional<span class="widont"> </span>gutter.</li>
<li>location is only needed with asymmetrical grids,
where <code>span(3 at 2)</code> will return the width of
specific columns on the grid.
Since these are functions, they will not handle placement for<span class="widont"> </span>you.</li>
</ul>
<h3 id="context-syntax-of-columns-container-spread-gutters-">Context Syntax: <code>[of <columns> <container-spread> <gutters>]</code></h3>
<p>The second half of Susy’s shorthand
describes the grid-<strong>context</strong> –
available columns, container-spread, and optional gutter override –
in any order.
All of these settings have globally-defined<span class="widont"> </span>defaults:</p>
<ul>
<li><code>span(2 of 6)</code> will set the context to
a slice of 6 columns from the global grid.
More details<span class="widont"> </span>below.</li>
<li><code>span(2 of 12 wide)</code> changes the container-spread
as well as the<span class="widont"> </span>column-context.</li>
<li><code>span(2 of 12 set-gutters 0.5em)</code>
will override the global gutters setting
for this one<span class="widont"> </span>calculation.</li>
</ul>
<p>A single unitless number for <code>columns</code>
will be treated as a slice of the parent grid.
On a grid with <code>columns: susy-repeat(12, 120px)</code>,
the shorthand <code>of 4</code> will use the parent <code>120px</code> column-width.
You can also be more explicit,
and say <code>of susy-repeat(4, 100px)</code>.
If you are using asymmetrical grids,
like <code>columns: (1 1 2 3 5 8)</code>,
Susy can’t slice it for you without knowing which columns you want.
The <code>slice</code> function accepts exactly the same syntax as <code>span</code>,
but returns a list of columns rather than a width.
Use it in your context like <code>of slice(first 3)</code>.</p>
</div>
</section>
<section class="item" id="function--susy-span">
<div data-item-section="header">
<h2 class="item-title">
<span class="item-type">@function</span>
<a href="#function--susy-span" class="item-name">susy-span()</a>
</h2>
<p class="alias">
aliased as
<span class="alias-title">span()</span>
</p>
<div class="text-block">
<p>This is the primary function in Susy —
used to return the width of a span across one or more columns,
and any relevant gutters along the way.
With the default settings,
<code>span(3)</code> will return the width of 3 columns,
and the 2 intermediate gutters.
This can be used to set the <code>width</code> property of grid elements,
or <code>margin</code> and <code>padding</code>
to push, pull, and pad your<span class="widont"> </span>elements.</p>
<ul>
<li>This is a thin syntax-sugar shell around
the core-math <code>su-span()</code> function.</li>
<li>The un-prefixed alias <code>span()</code> is available by<span class="widont"> </span>default.</li>
</ul>
</div>
</div>
<div data-item-section="parameter">
<h3 class="item-subtitle">
<span class="item-subtitle-main">Parameters &<span class="widont"> </span>Return</span>
</h3>
<div class="param-list">
<h4 class="param-title">
<span class="item-name">$span:</span>
<span class="value-type">(list)</span>
</h4>
<div class="param-details text-block">
<p>Shorthand expression to define the width of the span,
optionally<span class="widont"> </span>containing:</p>
<ul>
<li>a count, length, or column-list<span class="widont"> </span>span.</li>
<li><code>at $n</code>, <code>first</code>, or <code>last</code> location on asymmetrical grids,
where <code>at 1 == first</code>,
and <code>last</code> will calculate the proper location
based on columns and<span class="widont"> </span>span.</li>
<li><code>narrow</code>, <code>wide</code>, or <code>wider</code> for optionally spreading
across adjacent<span class="widont"> </span>gutters.</li>
<li><code>of $n <spread></code> for available grid columns
and spread of the container.
Span counts like <code>of 6</code> are valid
in the context of symmetrical grids,
where Susy can safely infer a slice of the parent<span class="widont"> </span>columns.</li>
<li>and <code>set-gutters $n</code> to override global gutter<span class="widont"> </span>settings.</li>
</ul>
</div>
</div>
<div class="param-list">
<h4 class="param-title">
<span class="item-name">$config:</span>
<span class="item-value">()</span>
<span class="value-type">(map)</span>
</h4>
<div class="param-details text-block">
<p>Optional map of Susy grid configuration settings.
See <code>$susy</code> documentation for<span class="widont"> </span>details.</p>
</div>
</div>
<div class="param-list">
<h4 class="param-title">
<span class="item-name">@return</span>
<span class="value-type">(length)</span>
</h4>
<div class="param-details text-block">
<p>Calculated length value, using the units given,
or converting to <code>%</code> for fraction-based grids,
or a full <code>calc</code> function when units/fractions
are not comparable outside the<span class="widont"> </span>browser.</p>
</div>
</div>
</div>
<div data-item-section="examples">
<h3 class="item-subtitle">
<span class="item-subtitle-main">Examples</span>
</h3>
<div class="example">
<div class="example-code">
<div class="code-block">
<div class="code-header">
<span class="code-language">
scss
</span>
<span class='code-description'>
span half the grid
</span>
</div>
<pre class="hljs-pre"><code class="lang-scss">.foo {
// the result is a bit under 50% to account for gutters
width: susy-span(6 of 12);
}</code></pre>
</div>
<div class="code-block">
<div class="code-header">
<span class="code-language">
css
</span>
<span class='code-description'>
compiled
</span>
</div>
<pre class="hljs-pre"><code class="lang-css">.foo {
width: 49.15254%;
}
</code></pre>
</div>
</div>
</div>
<div class="example">
<div class="example-code">
<div class="code-block">
<div class="code-header">
<span class="code-language">
scss
</span>
<span class='code-description'>
span a specific segment of asymmetrical grid
</span>
</div>
<pre class="hljs-pre"><code class="lang-scss">.foo {
width: susy-span(3 at 3 of (1 2 3 5 8));
}</code></pre>
</div>
<div class="code-block">
<div class="code-header">
<span class="code-language">
css
</span>
<span class='code-description'>
compiled
</span>
</div>
<pre class="hljs-pre"><code class="lang-css">.foo {
width: 82.5%;
}
</code></pre>
</div>
</div>
</div>
</div>
<div data-item-section="related">
<h3 class="item-subtitle">
<span class="item-subtitle-main">Related</span>
</h3>