SolidJS•14mo ago

How to array.filter Signal with array and pass down as Signal

I have a component:

export function ComboBox({
  options,
  selected,
  setSelected,
}

// with 
  createEffect(() =>
    setFilteredOptions(
      options.filter((option) =>
        option.label.toLowerCase().includes(searchTerm().toLowerCase())
      )
    )
  );

// returns combox with div, ul, li...

export function ComboBox({
  options,
  selected,
  setSelected,
}

// with 
  createEffect(() =>
    setFilteredOptions(
      options.filter((option) =>
        option.label.toLowerCase().includes(searchTerm().toLowerCase())
      )
    )
  );

// returns combox with div, ul, li...

That's how I call it

  onMount(async () => {
    const [categories, levels] = await Promise.all([
      getCategories(locale) as Promise<Category[]>,
      getLevels(locale) as Promise<Level[]>,
    ]);

    setData({
      categories,
      levels,
    });
  });

return...
          <ComboBox
              options={categories().filter((c) => !c.parent) || []}
            selected={selectedCategory}
            setSelected={setSelectedCategory}
            placeholder="Select a category"
          />

  onMount(async () => {
    const [categories, levels] = await Promise.all([
      getCategories(locale) as Promise<Category[]>,
      getLevels(locale) as Promise<Level[]>,
    ]);

    setData({
      categories,
      levels,
    });
  });

return...
          <ComboBox
              options={categories().filter((c) => !c.parent) || []}
            selected={selectedCategory}
            setSelected={setSelectedCategory}
            placeholder="Select a category"
          />

This was working with solidstart and routedata/createServerDta$, but now I have to use solidjs. I think it was working, because of ssr I think my Combox createEffect is never been called because options that I hand over is not a Signal anymore. So what would be an optimal strategy?

10 Replies

thetarnav•14mo ago

use createMemo for the filtered array

vikOP•14mo ago

Sure! Is that the most elegant way?

thetarnav•14mo ago

probably tbh I'm still trying to understand whats the issue effects definitely won't be called on the server because they are not meant to be used for state syncing

vikOP•14mo ago

I know, but then I never really checked if the effect was working and it was probably not crucial for current state of progress. So CombBox is a component, I would like to use it for different option[] kinds. I am not so sure about React anymore, I think would just rerender that complete ComboBox, on filter, so that might have worked in react?! But again I am not sure. Finding my way back to think reactive, think solidjs.

thetarnav•14mo ago

idiomatic solid might be very similar to idiomatic react but in react "just calling setState" will also kinda work, when here you always have to think about how to express the state with signals and memos Is replacing effect with a memo solving the problem? or is there something more?

vikOP•14mo ago

It works! thanks. Too easy 🙂

  const categoryOptions = createMemo(() =>
    data().categories.filter((c) => !c.parent)
  );
          <ComboBox
            options={categoryOptions}
            selected={selectedCategory}
            setSelected={setSelectedCategory}
            placeholder="Select a category"
          />

  const categoryOptions = createMemo(() =>
    data().categories.filter((c) => !c.parent)
  );
          <ComboBox
            options={categoryOptions}
            selected={selectedCategory}
            setSelected={setSelectedCategory}
            placeholder="Select a category"
          />

thetarnav•14mo ago

ah ok I was taking about the other effect here you could just add () => before the prevoius expression and it would also work if you destructure props then you have to pass them as functions for lazy access

vikOP•14mo ago

I understand. Haven't thought about createMemo inside Combobox. Sure, it would create the reactivity from the options by explicitly observing it. Actually

function ComboBox({
  options,
  selected,
  setSelected,
} 

const optionsMemo = createMemo(() => options);

// consume optionsMemo()
// not working

function ComboBox({
  options,
  selected,
  setSelected,
} 

const optionsMemo = createMemo(() => options);

// consume optionsMemo()
// not working

But <ComBoxy options={()=>categories.filter()}> works. (obviously i have to adjust ComboBox and usage of options)

M7•14mo ago

cos "options" is a getter? i.e you should call it like const optionsMemo = createMemo(() => options()); i guess..

vikOP•14mo ago

I solved this for now and understood a bit better reactivity of solidjs with help of thetarnav. Last comment showed what would not work, when option is an array, but not a function or Accessor. This thread shows shows a few approaches I have tried out. Finally I am choosing comobobox prop option to be a function. If I just pass down an array it won't work, because of lazy load feature of solidjs.

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How to array.filter Signal with array and pass down as Signal