Help understanding createResource

I have a setup like this (LIVE: https://playground.solidjs.com/anonymous/125ef44e-bee8-4049-b17c-166f6042f962)

import { render } from "solid-js/web";
import {
  createSignal,
  createResource,
  onMount,
  Switch,
  Match,
  Suspense,
  For,
  Show,
} from "solid-js";

async function fun(idb: boolean): Promise<string[]> {
  return new Promise((resolve, reject) => {
    if (!idb) return resolve([]);

    setTimeout(() => resolve(["a", "b", "c"]), 500);
  });
}

async function get_idb(): Promise<boolean> {
  return new Promise((resolve) => setTimeout(() => resolve(true), 500));
}

function App() {
  const [idb, setIdb] = createSignal<boolean | null>(null);
  const [res, { refetch }] = createResource(idb, fun);

  onMount(async () => {
    const idb = await get_idb();

    setIdb(idb);
  });

  return (
    <div>
      <h1>Hi</h1>
      <Show when={idb()} fallback={<p>loading idb...</p>}>
        <Suspense fallback={<p>loading things...</p>}>
          <Switch>
            <Match when={res()}>
              <p>things:</p>
              <For each={res()}>{(r) => <p>{r}</p>}</For>
            </Match>
            <Match when={res.error}>
              <p>something went wrong...</p>
              <button onClick={refetch}>try again</button>
            </Match>
          </Switch>
        </Suspense>
      </Show>
    </div>
  );
}

render(() => <App />, document.getElementById("app")!);

import { render } from "solid-js/web";
import {
  createSignal,
  createResource,
  onMount,
  Switch,
  Match,
  Suspense,
  For,
  Show,
} from "solid-js";

async function fun(idb: boolean): Promise<string[]> {
  return new Promise((resolve, reject) => {
    if (!idb) return resolve([]);

    setTimeout(() => resolve(["a", "b", "c"]), 500);
  });
}

async function get_idb(): Promise<boolean> {
  return new Promise((resolve) => setTimeout(() => resolve(true), 500));
}

function App() {
  const [idb, setIdb] = createSignal<boolean | null>(null);
  const [res, { refetch }] = createResource(idb, fun);

  onMount(async () => {
    const idb = await get_idb();

    setIdb(idb);
  });

  return (
    <div>
      <h1>Hi</h1>
      <Show when={idb()} fallback={<p>loading idb...</p>}>
        <Suspense fallback={<p>loading things...</p>}>
          <Switch>
            <Match when={res()}>
              <p>things:</p>
              <For each={res()}>{(r) => <p>{r}</p>}</For>
            </Match>
            <Match when={res.error}>
              <p>something went wrong...</p>
              <button onClick={refetch}>try again</button>
            </Match>
          </Switch>
        </Suspense>
      </Show>
    </div>
  );
}

render(() => <App />, document.getElementById("app")!);

I wanted to test out error handling, so I hardcoded a throw in the first request https://playground.solidjs.com/anonymous/121dd55e-bd06-44e9-b36e-ee56585d8ad3 But it doesn't work, and it renders the loading message after it errors out. I tried wrapping it in an error boundary like this, but it still doesn't work, it renders the fallback message, but nothing happens when you click the refetch button https://playground.solidjs.com/anonymous/a29f38e1-9724-43bb-928e-0e7f30ee9f30

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3 Replies

foolswisdom•3mo ago

When using suspense, you need to use the error boundary component, not use the error property of the resource

microsoftOP•3mo ago

is what I'm doing in the third example, and it displays the error part correctly, but when the try again button is pressed nothing happens

Madaxen86•3mo ago

Once the app is in an error state you need to use the reset callback provided by the errorboundary:

<ErrorBoundary
  fallback={(err, reset) => <div onClick={reset}>Error: {err.toString()}</div>}
>
…
</ErrorBoundary>

<ErrorBoundary
  fallback={(err, reset) => <div onClick={reset}>Error: {err.toString()}</div>}
>
…
</ErrorBoundary>

https://docs.solidjs.com/reference/components/error-boundary#lesserrorboundarygreater

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Help understanding createResource