Cancelling
Two cancellation paths: cancel() short-circuits before the fetch; controller.abort() stops an in-flight request. Both leave the form in a clean idle state.
The action sleeps 3 seconds to simulate a slow lookup. With {@attach enhance(...)}, submitting the same query twice calls cancel() — the fetch
never fires. The visible "Cancel" button calls controller.abort() to stop the in-flight request. Without enhancement, it is a plain POST that waits for the server.
With {@attach enhance(...)}
Search, then search the same query again (cancel) or click Cancel while searching (abort)
Plain HTML
Plain POST — waits the full 3 s, page re-renders with the result
<script lang="ts">
import LookupDemo from './LookupDemo.svelte';
</script>
<p>
The action sleeps 3 seconds to simulate a slow lookup. With <code>{'{@attach enhance(...)}'}</code>, submitting the same query twice calls <code>cancel()</code> — the fetch
never fires. The visible "Cancel" button calls <code>controller.abort()</code> to stop the in-flight request. Without enhancement, it is a plain POST that waits for the server.
</p>
<h3>With <code>{'{@attach enhance(...)}'}</code></h3>
<LookupDemo label="Search, then search the same query again (cancel) or click Cancel while searching (abort)" mochi:hydrate />
<h3>Plain HTML</h3>
<LookupDemo label="Plain POST — waits the full 3 s, page re-renders with the result" />
Styles
<style>
h3 {
margin: 1.5rem 0 0.25rem;
font-size: 0.95rem;
font-weight: 600;
color: var(--text-muted);
}
p {
margin: 0 0 0.5rem;
font-size: 0.9rem;
color: var(--text-muted);
}
code {
background: var(--code-bg);
color: var(--code-accent);
padding: 0.05rem 0.35rem;
border-radius: var(--radius-sm);
font-family: var(--font-mono);
font-size: 0.85rem;
}
</style>