Redirect from actions in Svelte - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of redirecting from actions in Svelte?

Redirecting from actions in Svelte is used to send the user to a different page after an action completes, like form submission, to improve user experience and avoid resubmission.

beginner

How do you perform a redirect from an action in SvelteKit?

You return a redirect response using the `redirect` helper from `@sveltejs/kit` inside the action function, specifying the status code (usually 303) and the target URL.

beginner

What HTTP status code is commonly used for redirecting after a POST action in SvelteKit?

The HTTP status code 303 (See Other) is commonly used to redirect after a POST action to tell the browser to fetch the new page with a GET request.

intermediate

Why should you avoid returning HTML directly after a form submission in SvelteKit actions?

Returning HTML directly can cause the browser to resubmit the form if the user refreshes. Redirecting avoids this by loading a new page, preventing duplicate submissions.

beginner

Show a simple example of redirecting from an action in SvelteKit.

import { redirect } from '@sveltejs/kit';

export const actions = {
  default: async ({ request }) => {
    // process form data here
    throw redirect(303, '/success');
  }
};

Which function do you use to redirect from an action in SvelteKit?

A navigate from 'svelte/navigation'

B fetch from 'svelte/http'

C goto from 'svelte/router'

D redirect from '@sveltejs/kit'

The `redirect` function from '@sveltejs/kit' is used to perform server-side redirects in actions.

What status code should you use for redirecting after a POST action?

A 303

B 404

C 200

D 500

Status code 303 tells the browser to perform a GET request to the new URL after a POST.

What happens if you don't redirect after a form POST in SvelteKit?

A The browser may resubmit the form on refresh

B The form data is lost

C The page automatically reloads without issues

D The server crashes

Without redirect, refreshing the page can cause the browser to resubmit the form, leading to duplicate submissions.

Where do you place the redirect call in SvelteKit actions?

A Inside the load function

B In the component's onMount hook

C Inside the action function after processing

D In the client-side script only

Redirects happen inside the action function after processing the form or action data.

Which of these is a benefit of redirecting after an action?

A Improves SEO by hiding the form

B Prevents duplicate form submissions on refresh

C Makes the page load faster

D Disables browser back button

Redirecting prevents duplicate form submissions by loading a new page after the action.

Explain how to implement a redirect from an action in SvelteKit and why it is important.

Think about what happens after a form is submitted and how redirect helps.

Describe the difference between returning HTML directly from an action and redirecting after an action in SvelteKit.

Consider what the browser does on page refresh in each case.