You can also declare event handlers inline:
App.svelte
<script>
let m = { x: 0, y: 0 };
function handleMove(event) {
m.x = event.clientX;
m.y = event.clientY;
}
</script>
<div
on:pointermove={(e) => {
m = { x: e.clientX, y: e.clientY };
}}
>
The pointer is at {m.x} x {m.y}
</div>In some frameworks you may see recommendations to avoid inline event handlers for performance reasons, particularly inside loops. That advice doesn't apply to Svelte — the compiler will always do the right thing, whichever form you choose.
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<script>
let m = { x: 0, y: 0 }; function handleMove(event) {m.x = event.clientX;
m.y = event.clientY;
}
</script>
<div on:pointermove={handleMove}> The pointer is at {m.x} x {m.y}</div>
<style>
div {position: fixed;
left: 0;
top: 0;
width: 100%;
height: 100%;
padding: 1rem;
}
</style>