SolidJS•14mo ago

Dynamic Component is not working

Hi, I try to use Dynamic component without success. I have try to replicate the issue in playground and the bug is still present : Playground : https://playground.solidjs.com/anonymous/83f1450a-6060-4ae1-8361-b6436402949b

import { Dynamic, render } from "solid-js/web";
import {  createEffect, createSignal } from "solid-js";

export const StepperLayout = (props) => {
  console.log('QWEQWEQWEQE');

  return <>STEP LAYOUT {props?.children}</>;
};

export const AppLayout = (props) => {
  return <>APP LAYOUT {props?.children}</>;
};


const LayoutHome = (props: { children; currentStep?: string }) => {
  const [layout, setLayout] = createSignal(AppLayout);

  createEffect(() => {
    if (props.currentStep?.startsWith('STEP')) {
      setLayout(StepperLayout);
    }
  });

  createEffect(() => {
    console.log(layout(), AppLayout);
  });

  return <Dynamic component={layout()}>{props.children}</Dynamic>;
};

function Counter() {
  const [count, setCount] = createSignal(1);
  const increment = () => setCount(count() + 1);

  return (
    <button type="button" onClick={increment}>
      {count()}
    </button>
  );
}

render(() => <><LayoutHome currentStep="STEP">toto</LayoutHome></>, document.getElementById("app")!);

import { Dynamic, render } from "solid-js/web";
import {  createEffect, createSignal } from "solid-js";

export const StepperLayout = (props) => {
  console.log('QWEQWEQWEQE');

  return <>STEP LAYOUT {props?.children}</>;
};

export const AppLayout = (props) => {
  return <>APP LAYOUT {props?.children}</>;
};


const LayoutHome = (props: { children; currentStep?: string }) => {
  const [layout, setLayout] = createSignal(AppLayout);

  createEffect(() => {
    if (props.currentStep?.startsWith('STEP')) {
      setLayout(StepperLayout);
    }
  });

  createEffect(() => {
    console.log(layout(), AppLayout);
  });

  return <Dynamic component={layout()}>{props.children}</Dynamic>;
};

function Counter() {
  const [count, setCount] = createSignal(1);
  const increment = () => setCount(count() + 1);

  return (
    <button type="button" onClick={increment}>
      {count()}
    </button>
  );
}

render(() => <><LayoutHome currentStep="STEP">toto</LayoutHome></>, document.getElementById("app")!);

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19 Replies

Jasmin•14mo ago

Interesting, if you pass the accessor without calling it, it works but typescript throws an error. <Dynamic component={layout}> Could be a mistake in the type definitions of the Dynamic component ah no this isn't the correct way. I checked the code of <Dynamic> at I'm not sure why this doesn't work thinkies

MirardesOP•14mo ago

Yes me too .... Since 25 minutes i'm struggling to understand maybe ping core team ?

Jasmin•14mo ago

Okay you have to wrap the layout components in a function when using them in the signal. This works: https://playground.solidjs.com/anonymous/b5543d36-5b89-4da9-a1c5-5fe368f88333

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Jasmin•14mo ago

can't explain why tho 🙈

MirardesOP•14mo ago

WTF doesn't make sense Dynamic don't support Accessible *Accessor so it should not work

Jasmin•14mo ago

it supports getters :)

MirardesOP•14mo ago

yes but why with a function return it works and with a value not due to solid-proxy ?

Jasmin•14mo ago

I'm not sure, but would be interested in the explanation @fabiospampinato surely knows whats happening here stare

you're probably right. it looks like accessing the signal returns the rendered component

fabiospampinato•14mo ago

yeah, if you uncomment the setLayout call both work, though I'm not sure if the one with the signal that returns () => AppLayout actually works

Jasmin•14mo ago

tricky situation you're right, it doesn't work. The initial value has to be createSignal(AppLayout) and you only have to wrap it in a function if you're changing the signal with the setter function https://playground.solidjs.com/anonymous/fc71a309-5ce4-4c2c-9ab5-37a23c8041cf this is the correct solution

MirardesOP•14mo ago

Sorry to be stupid but why in these condition it work only with () => ?

Jasmin•14mo ago

because if you're passing a function to the setter, solid thinks you want to do this:

const newCount = setCount((prev) => prev + 1);

const newCount = setCount((prev) => prev + 1);

and runs this function and uses its return value as the new value for the signal and in your case, the return value is the return value of your layout so we have to wrap it in another function

MirardesOP•14mo ago

so the issue come from how solid identify Functional Component

lxsmnsyc•14mo ago

no. The issue here is that signal setters can either accept the value or the action. action is a function if you pass a function to the setter, the setter thinks you are passing an "action" so it tries to resolve it.

Jasmin•14mo ago

https://github.com/solidjs/solid/blob/main/packages/solid/src/reactive/signal.ts#L237

MirardesOP•14mo ago

Okay seems logic

lxsmnsyc•14mo ago

or to simplify

function setSignal(newValue) {
  if (typeof newValue === 'function') {
    newValue = newValue(currentValue);
  }
  return updateState(newValue);
}

function setSignal(newValue) {
  if (typeof newValue === 'function') {
    newValue = newValue(currentValue);
  }
  return updateState(newValue);
}

MirardesOP•14mo ago

I can close the issue thanks !

Jasmin•14mo ago

yes

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