Formsnap

Installation

npm i formsnap sveltekit-superforms <your-schema-library>

Usage

1. Define a Zod schema

// schemas.ts
import { z } from "zod";
export const settingsFormSchema = z.object({
	email: z.string().email(),
	bio: z.string().max(250).optional(),
	marketingEmails: z.boolean().default(true),
	language: z.enum(["en", "es", "fr"]).default("en"),
	theme: z.enum(["light", "dark"]).default("light"),
});

2. Return the form from your load function

// +page.server.ts
import { superValidate } from "sveltekit-superforms";
import { zod } from "sveltekit-superforms/adapters";
import type { PageServerLoad } from "./$types";
import { settingsFormSchema } from "./schemas";
export const load: PageServerLoad = async () => {
	return {
		form: await superValidate(zod(settingsFormSchema)),
	};
};

3. Construct the form in your page

<script lang="ts">
	import { Field, Label, FieldErrors, Control, Description, Fieldset, Legend } from "formsnap";
	import { settingsFormSchema } from "./schemas";
	import { superForm } from "sveltekit-superforms";
	import { zodClient } from "sveltekit-superforms/adapters";

	let { data } = $props();

	const form = superForm(data.form, {
		validators: zodClient(settingsFormSchema),
	});

	const { form: formData, enhance } = form;
</script>
<form method="POST" use:enhance>
	<Field {form} name="email">
		<Control>
			{#snippet children({ props })}
				<Label>Email</Label>
				<input type="email" {...props} bind:value={$formData.email} />
			{/snippet}
		</Control>
		<Description>We'll provide critical updates about your account via email.</Description>
		<FieldErrors />
	</Field>
	<Field {form} name="bio">
		<Control>
			{#snippet children({ props })}
				<Label>Bio</Label>
				<textarea bind:value={$formData.bio} {...props} />
			{/snippet}
		</Control>
		<FieldErrors />
	</Field>
	<Field {form} name="language">
		<Control>
			{#snippet children({ props })}
				<Label>Language</Label>
				<select {...props} bind:value={$formData.language}>
					<option value="en">English</option>
					<option value="es">Spanish</option>
					<option value="fr">French</option>
				</select>
			{/snippet}
		</Control>
		<FieldErrors />
	</Field>
	<Field {form} name="marketingEmails">
		<Control>
			{#snippet children({ props })}
				<Label>Receive marketing emails from us</Label>
				<input type="checkbox" {...props} bind:checked={$formData.marketingEmails} />
			{/snippet}
		</Control>
		<FieldErrors />
	</Field>
	<Fieldset {form} name="theme">
		<Legend>Select your theme</Legend>
		{#each ["light", "dark"] as theme}
			<Control>
				{#snippet children({ props })}
					<input {...props} type="radio" bind:group={$formData.theme} value={theme} />
					<Label>{theme}</Label>
				{/snippet}
			</Control>
		{/each}
		<FieldErrors />
	</Fieldset>
	<button type="submit">Submit</button>
</form>

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