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import { invalidate } from '$app/navigation'
// this action (https://svelte.dev/tutorial/actions) allows us to
// progressively enhance a <form> that already works without JS
export function enhance(
form: HTMLFormElement,
{
pending,
error,
result
}: {
pending?: ({ data, form }: { data: FormData; form: HTMLFormElement }) => void;
error?: ({
data,
form,
response,
error
}: {
data: FormData;
form: HTMLFormElement;
response: Response | null;
error: Error | null;
}) => void;
result?: ({
data,
form,
response
}: {
data: FormData;
response: Response;
form: HTMLFormElement;
}) => void;
} = {}
): { destroy: () => void } {
let current_token: unknown
async function handle_submit(e: Event) {
const token = (current_token = {})
e.preventDefault()
const data = new FormData(form)
if (pending) pending({ data, form })
try {
const response = await fetch(form.action, {
method: form.method,
headers: {
accept: 'application/json'
},
body: data
});
if (token !== current_token) return
if (response.ok) {
if (result) result({ data, form, response })
const url = new URL(form.action)
url.search = url.hash = ''
invalidate(url.href)
} else if (error) {
error({ data, form, error: null, response })
} else {
console.error(await response.text())
}
} catch (e: any) {
if (error) {
error({ data, form, error: e, response: null })
} else {
throw e
}
}
}
form.addEventListener('submit', handle_submit)
return {
destroy() {
form.removeEventListener('submit', handle_submit)
}
}
}
|
