Places (New) Autocomplete Svelte

A flexible, accessible, and secure Svelte component leveraging the Google Maps Places Autocomplete API (New).

The component handles API loading, session tokens, debounced fetching, and accessibility, allowing you to focus on building your application. It intelligently manages the Google Maps API loader, creating a shared instance that prevents conflicts with other map components on the same page.

Available: Standalone JavaScript Library

Need this functionality for a non-Svelte project? Check out our companion vanilla JavaScript library, places-autocomplete-js, which offers the same core Google Places (New) Autocomplete features. View places-autocomplete-js on GitHub

Features

• Integrates with the modern Google Maps Places Autocomplete API (New).
• Automatic Shared Loader: Intelligently creates a single Google Maps loader instance and shares it via Svelte's context.
• Highly Accessible: Follows WAI-ARIA patterns for comboboxes, with full keyboard navigation and screen reader support.
• Secure: Safely renders suggestions to protect against XSS attacks.
• Automatically handles session tokens for cost management.
• Debounced Input: Limits API calls while the user is typing (configurable).
• Suggestion Highlighting: Automatically highlights the portion of text matching the user's input.
• Imperative API: Exposes clear(), focus(), and getRequestParams() methods for direct control.
• Customisable Styling: Easily override default styles using the options.classes prop.
• TypeScript Support: Fully written in TypeScript with included type definitions.
• Event Handling: Provides onResponse and onError callbacks.

Demo

See a live demo of the component in action: Basic Example

Reactive parameters - change the search criteria based on user input, like filtering by country or change results language.

Customise request parameters - construct a requestParams object and control various aspects of the search, including language, region, and more.

Retain Input Value After Selection - This example demonstrates how to configure the component to keep the selected address visible in the input field after a suggestion is chosen.

Requirements

• Google Maps API Key with the "Places API" enabled. Refer to Use API Keys for detailed instructions.

Installation

npm install places-autocomplete-svelte
# or
yarn add places-autocomplete-svelte

Usage

Provide your Google Maps API key to the component. It will automatically handle loading the required places library.

<script lang="ts">
import { PlaceAutocomplete } from 'places-autocomplete-svelte';
import type { PlaceResult, ComponentOptions, RequestParams } from 'places-autocomplete-svelte/interfaces';

// Get API Key securely (e.g., from environment variables)
const PUBLIC_GOOGLE_MAPS_API_KEY = import.meta.env.VITE_PUBLIC_GOOGLE_MAPS_API_KEY;

// --- Event Handlers ---
let fullResponse: PlaceResult | null = $state(null);
let placesError = $state('');

const handleResponse = (response: PlaceResult) => {
	console.log('Place Selected:', response);
	fullResponse = response;
	placesError = ''; // Clear previous errors
};

const handleError = (error: string) => {
	console.error('Places Autocomplete Error:', error);
	placesError = error;
	fullResponse = null; // Clear previous results
};

// --- Configuration (Optional) ---
const requestParams: Partial<RequestParams> = $state({
	region: 'GB',
	language: 'en-GB',
});
const fetchFields: string[] = $state(['formattedAddress', 'addressComponents', 'displayName']);
const options: Partial<ComponentOptions> = $state({
	placeholder: 'Start typing your address...',
	debounce: 200,
	classes: {
		input: 'my-custom-input-class border-blue-500',
		highlight: 'bg-yellow-200 text-black',
	},
    clear_input: false,
});
</script>

{#if placesError}
    <div class="error-message" role="alert">
        Error: {placesError}
    </div>
{/if}

<PlaceAutocomplete
    {PUBLIC_GOOGLE_MAPS_API_KEY}
    {requestParams}
    {fetchFields}
    {options}
    onResponse={handleResponse}
    onError={handleError}
/>

{#if fullResponse}
    <h2>Selected Place Details:</h2>
    <pre>{JSON.stringify(fullResponse, null, 2)}</pre>
{/if}

<style>
    :global(.my-custom-input-class) {
        padding: 0.75rem;
        border-radius: 0.25rem;
        width: 100%;
    }
    .error-message {
        color: red;
        margin-bottom: 1rem;
    }
</style>

Advanced: Using with other Google Maps Libraries

You can reuse the shared Google Maps loader created by the PlaceAutocomplete component to load other libraries (like maps). Because the loader instance is shared, you can access it from any other component to load additional libraries without causing conflicts.

The PlaceAutocomplete component only loads the places library by default.

// In a parent component, e.g., src/routes/+page.svelte
<script lang="ts">
	import { onMount } from 'svelte';
	import { getGMapsLoader } from 'places-autocomplete-svelte/gmaps';
	import PlaceAutocomplete from '$lib/PlaceAutocomplete.svelte';

	const PUBLIC_GOOGLE_MAPS_API_KEY = import.meta.env.VITE_PUBLIC_GOOGLE_MAPS_API_KEY;

	// Pre-initialise the loader with all libraries needed for this page.
	onMount(async () => {
		const loader = getGMapsLoader(PUBLIC_GOOGLE_MAPS_API_KEY);
		const { Map } = await loader.importLibrary('maps');
        ...
	});
</script>

<!-- The component will now use the loader you created above -->
<PlaceAutocomplete
    {PUBLIC_GOOGLE_MAPS_API_KEY}
    onResponse={...}
    onError={...}
/>

<!-- You can now use other Google Maps services, e.g., a map -->
<div id="map"></div>

Security

API Key Security

Your Google Maps API Key is a sensitive credential. To prevent unauthorised use and unexpected charges, you must restrict it.

1. Go to the Google Cloud Console.
2. Select your API key.
3. Under Application restrictions, select HTTP referrers (web sites) and add your application's domain(s) (e.g., your-domain.com/*).
4. Under API restrictions, select Restrict key and choose the APIs you are using (e.g., Places API, Maps JavaScript API).

XSS Protection

This component is designed to be secure out-of-the-box. It safely renders user-input and API responses to prevent Cross-Site Scripting (XSS) vulnerabilities.

Accessibility

This component is built to be accessible and follows the WAI-ARIA Authoring Practices for a Combobox.

• Keyboard Navigation: Users can navigate suggestions using ArrowUp, ArrowDown, select with Enter, and close the list with Escape.
• Screen Reader Support: Uses role="combobox", aria-autocomplete, aria-expanded, and aria-activedescendant to provide a clear experience for screen reader users.
• Focus Management: Focus remains on the input field while navigating the suggestion list.

Props

Prop	Type	Required	Default	Description
PUBLIC_GOOGLE_MAPS_API_KEY	string	Yes	-	Your restricted Google Maps API Key.
fetchFields	string[]	No	['formattedAddress', 'addressComponents']	Place Data Fields to request. Affects API cost.
requestParams	Partial<RequestParams>	No	{ inputOffset: 3, ... }	Parameters for the Autocomplete API request.
options	Partial<ComponentOptions>	No	{ debounce: 100, ... }	Options to control component behavior and appearance.
onResponse	(response: PlaceResult) => void	Yes	-	Callback triggered with the selected place details.
onError	(error: string) => void	Yes	-	Callback triggered when an error occurs.

Component Methods (Imperative API)

Get a reference to the component instance using bind:this to call its methods directly.

Example:

<script lang="ts">
    import PlaceAutocomplete from 'places-autocomplete-svelte';
    let autocompleteComponent: PlaceAutocomplete | undefined = $state(undefined);
</script>

<PlaceAutocomplete bind:this={autocompleteComponent} ... />

<button onclick={() => autocompleteComponent?.clear()}>Clear</button>
<button onclick={() => autocompleteComponent?.focus()}>Focus</button>

Method	Signature	Description
clear()	() => void	Clears the input, removes suggestions, and resets the session token.
focus()	() => void	Sets focus on the text input field.
getRequestParams()	() => RequestParams	Returns the current internal requestParams object.

Options

Option	Type	Default	Description
placeholder	string	''	Placeholder text for the input field.
debounce	number	100	Delay in ms before firing API request. Set to 0 to disable.
distance	boolean	true	Show distance from requestParams.origin (if provided).
distance_units	'km' | 'miles'	'km'	Units for displaying distance.
label	string	''	Optional label text displayed above the input.
autofocus	boolean	false	Automatically focus the input on mount.
autocomplete	string	'off'	The autocomplete attribute for the input field.
classes	Partial<ComponentClasses>	{}	Object to override default CSS classes. See Styling section.
clear_input	boolean	true	If false, retains the formattedAddress in the input after selection.

Styling (options.classes)

Customise the component by providing your own CSS classes via options.classes.

Available Class Keys:

• section: The main container section.
• container: The div containing the input and suggestions list.
• label: The label element.
• input: The main text input element.
• icon_container: Container for the optional icon.
• icon: SVG string for the icon.
• ul: The <ul> element for the suggestions list.
• li: Each <li> suggestion item.
• li_current: Class added to the currently highlighted <li>.
• li_div_container: Container div within each list item.
• li_div_one: First inner div (contains the main text).
• li_div_one_p: The <p> tag containing the main suggestion text.
• li_div_two: Second inner div (contains the distance).
• li_div_two_p: The <p> tag containing the distance text.
• kbd_container: Container for the keyboard hint keys.
• kbd_escape: The <kbd> tag for the 'Esc' hint.
• kbd_up: The <kbd> tag for the 'Up Arrow' hint.
• kbd_down: The <kbd> tag for the 'Down Arrow' hint.
• highlight: The class applied to the <span> wrapping the matched text. Defaults to 'font-bold'.

Example:

const options = {
  classes: {
    input: 'form-input w-full rounded-md shadow-sm',
    ul: 'absolute bg-white shadow-lg rounded-md mt-1 w-full z-10',
    li_current: 'bg-blue-500 text-white',
    highlight: 'text-blue-700 font-semibold'
  }
};

Events

• onResponse: (response: PlaceResult) => void
  • Fired after a user selects a suggestion and fetchFields are retrieved.
• onError: (error: string) => void
  • Fired on any error (API loading, fetching suggestions, etc.).

TypeScript

This component is written in TypeScript. Import types from places-autocomplete-svelte/interfaces and helpers from places-autocomplete-svelte/gmaps.

Google Places API & Billing

• This component uses the Google Maps JavaScript API (Places library). Usage is subject to Google's terms and pricing.
• It uses Session Tokens automatically to group Autocomplete requests, which can reduce costs.
• Place Details requests (via fetchFields) are billed separately. Only request the fields you need to manage costs.

Contributing

Contributions are welcome! Please feel free to open an issue or submit a pull request.

License

MIT