82 lines
2.9 KiB
Markdown
82 lines
2.9 KiB
Markdown
---
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title: Options
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taxonomy:
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category: docs
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process:
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twig: true
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never_cache_twig: true
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---
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A traditional `<select>` box contains any number of `<option>` elements. Each of these is rendered as an option in the dropdown menu. Select2 preserves this behavior when initialized on a `<select>` element that contains `<option>` elements, converting them into its internal JSON representation:
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```
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{
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"id": "value attribute" || "option text",
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"text": "label attribute" || "option text",
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"element": HTMLOptionElement
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}
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```
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`<optgroup>` elements will be converted into data objects using the following rules:
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```
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{
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"text": "label attribute",
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"children": [ option data object, ... ],
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"element": HTMLOptGroupElement
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}
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```
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>>> Options sourced from [other data sources](/data-sources) must conform to this this same internal representation. See ["The Select2 data format"](/data-sources/formats) for details.
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## Dropdown option groups
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In HTML, `<option>` elements can be grouped by wrapping them with in an `<optgroup>` element:
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```
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<select>
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<optgroup label="Group Name">
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<option>Nested option</option>
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</optgroup>
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</select>
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```
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Select2 will automatically pick these up and render them appropriately in the dropdown.
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### Hierarchical options
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Only a single level of nesting is allowed per the HTML specification. If you nest an `<optgroup>` within another `<optgroup>`, Select2 will not be able to detect the extra level of nesting and errors may be triggered as a result.
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Furthermore, `<optgroup>` elements **cannot** be made selectable. This is a limitation of the HTML specification and is not a limitation that Select2 can overcome.
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If you wish to create a true hierarchy of selectable options, use an `<option>` instead of an `<optgroup>` and [change the style with CSS](http://stackoverflow.com/q/30820215/359284#30948247). Please note that this approach may be considered "less accessible" as it relies on CSS styling, rather than the semantic meaning of `<optgroup>`, to generate the effect.
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## Disabling options
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Select2 will correctly handle disabled options, both with data coming from a standard select (when the `disabled` attribute is set) and from remote sources, where the object has `disabled: true` set.
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<div class="s2-example">
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<select class="js-example-disabled-results form-control">
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<option value="one">First</option>
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<option value="two" disabled="disabled">Second (disabled)</option>
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<option value="three">Third</option>
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</select>
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</div>
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<pre data-fill-from=".js-code-disabled-option"></pre>
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```
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<select class="js-example-disabled-results">
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<option value="one">First</option>
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<option value="two" disabled="disabled">Second (disabled)</option>
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<option value="three">Third</option>
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</select>
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```
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<script type="text/javascript" class="js-code-disabled-option">
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var $disabledResults = $(".js-example-disabled-results");
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$disabledResults.select2();
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</script>
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