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<h1>
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<section class="normal markdown-section">
<h1 id="options">Options</h1>
<h2 id="scriptable-options">Scriptable Options</h2>
<p>Scriptable options also accept a function which is called for each data and that takes the unique argument <code>context</code> representing contextual information (see <a href="options.html#option-context">option context</a>).</p>
<p>Example:</p>
<pre><code class="lang-javascript">color: <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">context</span>) </span>{
<span class="hljs-keyword">var</span> index = context.dataIndex;
<span class="hljs-keyword">var</span> value = context.dataset.data[index];
<span class="hljs-keyword">return</span> value < <span class="hljs-number">0</span> ? <span class="hljs-string">'red'</span> : <span class="hljs-comment">// draw negative values in red</span>
index % <span class="hljs-number">2</span> ? <span class="hljs-string">'blue'</span> : <span class="hljs-comment">// else, alternate values in blue and green</span>
<span class="hljs-string">'green'</span>;
}
</code></pre>
<blockquote>
<p><strong>Note:</strong> scriptable options are only supported by a few bubble chart options.</p>
</blockquote>
<h2 id="indexable-options">Indexable Options</h2>
<p>Indexable options also accept an array in which each item corresponds to the element at the same index. Note that this method requires to provide as many items as data, so, in most cases, using a <a href="#scriptable-options">function</a> is more appropriated if supported.</p>
<p>Example:</p>
<pre><code class="lang-javascript">color: [
<span class="hljs-string">'red'</span>, <span class="hljs-comment">// color for data at index 0</span>
<span class="hljs-string">'blue'</span>, <span class="hljs-comment">// color for data at index 1</span>
<span class="hljs-string">'green'</span>, <span class="hljs-comment">// color for data at index 2</span>
<span class="hljs-string">'black'</span>, <span class="hljs-comment">// color for data at index 3</span>
<span class="hljs-comment">//...</span>
]
</code></pre>
<h2 id="option-context">Option Context</h2>
<p>The option context is used to give contextual information when resolving options and currently only applies to <a href="#scriptable-options">scriptable options</a>.</p>
<p>The context object contains the following properties:</p>
<ul>
<li><code>chart</code>: the associated chart</li>
<li><code>dataIndex</code>: index of the current data</li>
<li><code>dataset</code>: dataset at index <code>datasetIndex</code></li>
<li><code>datasetIndex</code>: index of the current dataset</li>
</ul>
<p><strong>Important</strong>: since the context can represent different types of entities (dataset, data, etc.), some properties may be <code>undefined</code> so be sure to test any context property before using it.</p>
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