SolidJS•15mo ago

Adding components that use context to the DOM after mount

I have a component (ShelfScene) that returns a mapped list of items (Shelf). The ShelfScene component appends a few Shelf components onMount and those render and use context fine with no issues. However when I try to append a new Shelf component after mount the new component is not able to read the context. Any Ideas?

10 Replies

thetarnav•15mo ago

Could you share some code? is hard to guess rn

TheOinkinatorOP•15mo ago

You got it here is the component that wraps context:

import { StackDraggingProvider } from "../../../context/StackDraggingContext";
import { SelectedBinderProvider } from "../../../context/SelectedBinderContext";
import { ActiveStackProvider } from "../../../context/ActiveStackContext";
import ShelfScene from "../shelfScene/ShelfScene";

export default function ShelfContextWrap() {
  return (
    <StackDraggingProvider dragState={"still"}>
      <SelectedBinderProvider selectedBinderState={0}>
        <ActiveStackProvider activeStackState={null}>
          <ShelfScene />
        </ActiveStackProvider>
      </SelectedBinderProvider>
    </StackDraggingProvider>
  );
}

import { StackDraggingProvider } from "../../../context/StackDraggingContext";
import { SelectedBinderProvider } from "../../../context/SelectedBinderContext";
import { ActiveStackProvider } from "../../../context/ActiveStackContext";
import ShelfScene from "../shelfScene/ShelfScene";

export default function ShelfContextWrap() {
  return (
    <StackDraggingProvider dragState={"still"}>
      <SelectedBinderProvider selectedBinderState={0}>
        <ActiveStackProvider activeStackState={null}>
          <ShelfScene />
        </ActiveStackProvider>
      </SelectedBinderProvider>
    </StackDraggingProvider>
  );
}

Here is ShelfScene:

import './shelfSceneStyles.css';
import Shelf from '../shelf/Shelf';
import TestComponent from '../../testComponent/TestComponent';
import { createSignal, onMount, For } from 'solid-js';

export default function ShelfScene() {
  const [shelfList, setShelfList] = createSignal<any[]>([]);

  onMount(() => {
    setShelfList((prevList) => [
      ...prevList,
      <TestComponent />,
      <Shelf shelfRef="1" />,
      <Shelf shelfRef="2" />,
    ]);
  });

  function newShelf() {
    setShelfList((prevList) => [...prevList, <TestComponent />]);
  }

  return (
    <div
      style={{ 'background-color': 'red' }}
      onclick={() => {
        newShelf();
      }}
    >
      {shelfList().map((component) => {
        return component;
      })}
    </div>
  );
}

import './shelfSceneStyles.css';
import Shelf from '../shelf/Shelf';
import TestComponent from '../../testComponent/TestComponent';
import { createSignal, onMount, For } from 'solid-js';

export default function ShelfScene() {
  const [shelfList, setShelfList] = createSignal<any[]>([]);

  onMount(() => {
    setShelfList((prevList) => [
      ...prevList,
      <TestComponent />,
      <Shelf shelfRef="1" />,
      <Shelf shelfRef="2" />,
    ]);
  });

  function newShelf() {
    setShelfList((prevList) => [...prevList, <TestComponent />]);
  }

  return (
    <div
      style={{ 'background-color': 'red' }}
      onclick={() => {
        newShelf();
      }}
    >
      {shelfList().map((component) => {
        return component;
      })}
    </div>
  );
}

TheOinkinatorOP•15mo ago

<TestComponent /> and <Shelf /> are components that use context passed in the context wrap component. When I run newShelf() onclick with a generic div it mounts just fine but when I try to add one of the context using components. (shown above ) they do not mount and I get these errors:

TheOinkinatorOP•15mo ago

If its relevanant this is a multi page application and the I am using astro to handle the routing

thetarnav•15mo ago

newShelf fm gets called in an event listener cb which, where context is not available if you wrap component calls with a thunk, so it gets called lazily in jsx it should work

TheOinkinatorOP•15mo ago

could you enlighten me on what a thunk is? sorry, relatively new to programming in general and solid. thanks!

thetarnav•15mo ago

() =>

TheOinkinatorOP•15mo ago

so:

function newShelf() {
    setShelfList((prevList) => [...prevList, () => {<TestComponent />}]);
  }

onclick={() => {
        newShelf();
      }}

function newShelf() {
    setShelfList((prevList) => [...prevList, () => {<TestComponent />}]);
  }

onclick={() => {
        newShelf();
      }}

OK adding a return to the thunk does the trick:

function newShelf() {
    setShelfList((prevList) => [...prevList, () => { return <TestComponent />}]);
  }

onclick={() => {
        newShelf();
      }}

function newShelf() {
    setShelfList((prevList) => [...prevList, () => { return <TestComponent />}]);
  }

onclick={() => {
        newShelf();
      }}

Thank you much!

thetarnav•15mo ago

you should probably look into rendering them with For instead though you’re at risk of rerendering components a lot of you just map over an array and render that

TheOinkinatorOP•15mo ago

yes I was using for initially I switched to the map during the debugging process. Thanks for the advice!

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Adding components that use context to the DOM after mount