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<section>
<h2 id="data-adapters-select-tag">
Can Select2 be used with a <code>&lt;select&gt;</code> tag?
</h2>
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<p>
Select2 was designed to be a replacement for the standard <code>&lt;select&gt;</code> boxes that are displayed by the browser, so by default it supports all options and operations that are available in a standard select box, but with added flexibility. There is no special configuration required to make Select2 work with a <code>&lt;select&gt;</code> tag.
</p>
<h3>
Does Select2 support nesting options?
</h3>
<p>
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A standard <code>&lt;select&gt;</code> box can display nested options by wrapping them with in an <code>&lt;optgroup&gt;</code> tag.
</p>
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<pre class="prettyprint">
&lt;select&gt;
&lt;optgroup label="Group Name"&gt;
&lt;option&gt;Nested option&lt;/option&gt;
&lt;/optgroup&gt;
&lt;/select&gt;
</pre>
<h3>
How many levels of nesting can there be?
</h3>
<p>
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Only a single level of nesting is allowed per the HTML specification. If you nest an <code>&lt;optgroup&gt;</code> within another <code>&lt;optgroup&gt;</code>, Select2 will not be able to detect the extra level of nesting and errors may be triggered as a result.
</p>
<h3>
Can <code>&lt;optgroup&gt;</code> tags be made selectable?
</h3>
<p>
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No. This is a limitation of the HTML specification and is not a limitation that Select2 can overcome. You can emulate grouping by using an <code>&lt;option&gt;</code> instead of an <code>&lt;optgroup&gt;</code> and <a href="http://stackoverflow.com/q/30820215/359284#30948247">changing the style by using CSS</a>, but this is not recommended as it is not fully accessible.
</p>
<h3>
How are <code>&lt;option&gt;</code> and <code>&lt;optgroup&gt;</code> tags serialized into data objects?
</h3>
<p>
Select2 will convert the <code>&lt;option&gt;</code> tag into a data object based on the following rules.
</p>
<pre class="prettyprint linenums">
{
"id": "value attribute" || "option text",
"text": "label attribute" || "option text",
"element": HTMLOptionElement
}
</pre>
<p>
And <code>&lt;optgroup&gt;</code> tags will be converted into data objects using the following rules
</p>
<pre class="prettyprint linenums">
{
"text": "label attribute",
"children": [ option data object, ... ],
"elment": HTMLOptGroupElement
}
</pre>
</section>