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Basic Svelte
Introduction
Reactivity
Props
Logic
Events
Bindings
Classes and styles
Actions
Transitions
Advanced Svelte
Advanced reactivity
Reusing content
Motion
Advanced bindings
Advanced transitions
Context API
Special elements
<script module>
Next steps
Basic SvelteKit
Introduction
Routing
Loading data
Headers and cookies
Shared modules
Forms
API routes
$app/state
Errors and redirects
Advanced SvelteKit
Hooks
Page options
Link options
Advanced routing
Advanced loading
Environment variables
Conclusion

Just as you can add event listeners to any DOM element, you can add event listeners to the window object with <svelte:window>.

We’ve already got an onkeydown function declared — now all we need to do is wire it up:

App
<svelte:window {onkeydown} />

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<script>
	let key = $state();
	let keyCode = $state();
 
	function onkeydown(event) {
		key = event.key;
		keyCode = event.keyCode;
	}
</script>
 
<svelte:window />
 
<div style="text-align: center">
	{#if key}
		<kbd>{key === ' ' ? 'Space' : key}</kbd>
		<p>{keyCode}</p>
	{:else}
		<p>Focus this window and press any key</p>
	{/if}
</div>
 
<style>
	div {
		display: flex;
		height: 100%;
		align-items: center;
		justify-content: center;
		flex-direction: column;
	}
 
	kbd {
		border-radius: 4px;
		font-size: 6em;
		padding: 0.2em 0.5em;
		background-color: #eeeeee;
		border-top: 5px solid #f9f9f9;
		border-left: 5px solid #f9f9f9;
		border-right: 5px solid #aaaaaa;
		border-bottom: 5px solid #aaaaaa;
		color: #555;
	}
</style>