eck-autocomplete

Autocomplete web component. Suggests options for an input.

        

Get started

Install

CDN

<script type="module" src="https://unpkg.com/[email protected]/min/eck-autocomplete.js"></script>

Package and import

npm i --save-exact eck-autocomplete

Importing the entry point will automatically register the custom elements.

import 'eck-autocomplete';

Recommended global CSS

The styles of a custom element can only take effect after the JavaScript has been parsed. This leads to initially unstyled components. This is especially bad in a case like this autocomplete where the content is hidden by default. To prevent this so called FOUC (Flash of unstyled content) you can predefine the default styling globally like this:

/**
  * Global FOUC (Flash of unstyled content) fix specific for autocomplete
  */
eck-autocomplete:not(:defined) {
  display: none;
}

Example HTML

<input id="input1" type="text" />
<eck-autocomplete connected-to-id="input1">
  <eck-autocomplete-option>One</eck-autocomplete-option>
  <eck-autocomplete-option>Two</eck-autocomplete-option>
  <eck-autocomplete-option>Three</eck-autocomplete-option>
</eck-autocomplete>

API

eck-autocomplete

Attributes

Name	Type (coerced)	Description	Default
connected-to-id	string	ID of the HTML input that the autocomplete panel should be connected to. In case you can't provide an ID you can use the method setInputRef documented in the methods section of these docs.
anchored-to-id	string	Optional ID of the HTML element that the autocomplete panel should be attached to. In case you can't provide an ID you can use the method setInputRef documented in the methods section of these docs.	If this attribute is not specified the panel will be attached to the connected input.
highlight-first-option	boolean	Whether the first option in the panel should be highlighted when it is opened.	false
select-highlighted-option	boolean	Whether an options value should be transfered to the input when highlighted. When pressing ESC the value won't be saved and the input resets to the original value.	true

Methods

Signature	Description
setInputRef(inputElement: HTMLInputElement, anchorElement?: HTMLElement): void	Can be used to programmatically set the reference to an HTML input element to which the autocomplete panel will connect to. You can also optionally provide an element to which the panel should be attached to.
injectCSS(css: string): void	The component is encapsulated in a Shadow DOM. To style it you should use the provided custom properties. In case you absolutely have to override some CSS that can't be reached from the outside you can inject it with this method.

Custom Properties

Name	Description	Default
--eck-ac-max-height	max-height of the overlay panel.	256px
--eck-ac-background-color	background-color of the overlay panel.	#fff
--eck-ac-border-size	size of the border around the overlay panel.	1px
--eck-ac-border-color	color of the border around the overlay panel.	black
--eck-ac-border-radius	radius of the border around the overlay panel.	0

eck-autocomplete-option

Attributes

Name	Type (coerced)	Description	Default
label	string	Optional string that is used to display the option in contexts that only allow strings (e.g. inputs). If not provided the innerHtml is used.	undefined

Properties

Name	Type (coerced)	Description	Default
value	unknown	Optional data that is attached to an option.

Methods

Signature	Description
injectCSS(css: string): void	The component is encapsulated in a Shadow DOM. To style it you should use the provided custom properties. In case you absolutely have to override some CSS that can't be reached from the outside you can inject it with this method.

Custom Properties

Name	Description	Default
--eck-aco-padding	padding of the option element.	5px
--eck-aco-color	color of the option element.	black
--eck-aco-background-color	background-color of a highlighted option element.	#b3e5fc

Events

Type	Bubbles	Interface for detail value
eck-autocomplete-option-selected	true	EckAutocompleteOptionSelectEvent

Interfaces

EckAutocompleteOptionSelectEvent

export interface EckAutocompleteOptionSelectEvent<T = unknown> {
  /**
   * Optionally provided by the user via the `value` property.
   */
  value: T;
  /**
   * Either the label that the user optionally provided via the `label` attribute
   * or otherwise the `innerHTML` of this option.
   */
  label: string;
}