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# Dropdown

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The `auro-dropdown` component is a trigger and dropdown element combination intended to be used with dropdown content that is interactive. `auro-dropdown` is content agnostic and any valid HTML can be placed in either the trigger or the dropdown.

_Note: if the dropdown content in your implementation is not interactive (e.g. a tooltip) [auro-popover](http://auro.alaskaair.com/components/auro/popover) may better serve your needs._
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## Dropdown Use Cases

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The `auro-dropdown` element should be used in situations where users may:

* interact with an element to get clarification on content offering
* provide definition to iconic imagery
* when interactive help is required
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## Getting Started

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#### NPM Installation

```shell
$ npm i @aurodesignsystem/auro-formkit
```
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### TypeScript Module Resolution

When using TypeScript set `moduleResolution` to `bundler`, add the following to your `tsconfig.json`:

```json
{
    "compilerOptions": {
        "moduleResolution": "bundler"
    }
}
```

This configuration enables proper module resolution for the component's TypeScript files.
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## Install from CDN

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In cases where the project is not able to process JS assets, there are pre-processed assets available for use. Legacy browsers such as IE11 are no longer supported.

```html
<script type="module" src="https://cdn.jsdelivr.net/npm/@aurodesignsystem/auro-formkit@latest/auro-dropdown/+esm"></script>
```
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## Formkit Development

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### Filtering

Running the `dev` command will open a `localhost` development server for all components in the monorepo at once.

To only develop a single component, use the `--filter` flag:

```shell
npx turbo dev --filter=@aurodesignsystem/auro-input
```
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## Custom Component Registration for Version Management

There are two key parts to every Auro component: the <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Classes">class</a> and the custom element definition. The class defines the component’s behavior, while the custom element registers it under a specific name so it can be used in HTML.

When you install the component as described on the `Install` page, the class is imported automatically, and the component is registered globally for you.

However, if you need to load multiple versions of the same component on a single page (for example, when two projects depend on different versions), you can manually register the class under a custom element name to avoid conflicts.

You can do this by importing only the component class and using the `register(name)` method with a unique name:

```js
// Import the class only
import { AuroDropdown } from '@aurodesignsystem/auro-formkit/auro-dropdown/class';

// Register with a custom name if desired
AuroDropdown.register('custom-dropdown');
```

This will create a new custom element `<custom-dropdown>` that behaves exactly like `<auro-dropdown>`, allowing both to coexist on the same page without interfering with each other.

<div class="exampleWrapper exampleWrapper--flex">
  <custom-dropdown id="customCommon" layout="classic" shape="classic" size="lg" aria-label="Label content for screen reader">
    <div style="padding: var(--ds-size-150);">
      Lorem ipsum solar
      <br />
      <auro-button id="customCommonButton">
        Dismiss Dropdown
      </auro-button>
    </div>
    <span slot="helpText">
      Help text
    </span>
    <div slot="trigger">
      Trigger
    </div>
  </custom-dropdown>
</div>
<auro-accordion alignRight>
  <span slot="trigger">See code</span>

```html
  <custom-dropdown id="customCommon" layout="classic" shape="classic" size="lg" aria-label="Label content for screen reader">
    <div style="padding: var(--ds-size-150);">
      Lorem ipsum solar
      <br />
      <auro-button id="customCommonButton">
        Dismiss Dropdown
      </auro-button>
    </div>
    <span slot="helpText">
      Help text
    </span>
    <div slot="trigger">
      Trigger
    </div>
  </custom-dropdown>
```
</auro-accordion>
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