Is it possible somehow to use form-acitons and prerender?

[alexbjorlig]

We are trying to build our login page with the new form actions.

It works like a charm - but it fails when we try to prerender the app.

Will this never work - do we have to stop using form-actions if we want to prerender?

[teemingc]

It will never work. You will have to either disable prerendering for the page or remove the form actions.

[ngalaiko]

do you know what is the limitation exactly? because actions work fine without javascript on the client side, so prerendering the html should be possible?

[teemingc]

My understanding is that prerendering computes the page contents at build time. However, form actions occur at runtime and use search parameters e.g., <form action="todo?/add"> which the docs mention are forbidden.

Accessing url.searchParams during prerendering is forbidden.

https://kit.svelte.dev/docs/page-options#prerender-when-not-to-prerender

Note that I'm just guessing here, and don't know the actual reason.

[geoffrich]

More discussion in #7586

the tl;dr is that you can't POST data to a static file. Most webservers will respond to requests for /YOUR_ROUTE with the static file before even letting SvelteKit see the request, which means you need a server to handle that route.

[alexbjorlig]

It makes sense that you can't POST data to a static file, but could the form actions not just live on another route?