`useSearchParams` suggestion

It would be very needed that setSearchParams from solid-start works like setting state, meaning it holds previous value and overwrites existing state when omitting prev. That way, it both works when you want to overwrite existing or append.

setSearchParams({ hello: "world" }) //overwrites existing
setSearchParams(prev => ({...prev, hello: "world" })) //appends

[mtt-artis]

Undefined for delete ?

setSearchParams(prev => ({...prev, hello: undefined })) // delete

If searchParams returned an Object instead of a Proxy, one could do:

setSearchParams(prev => {
  delete prev["hello"]
  return prev
})

It should return an object imo:

export function useSearchParams() {
  let initial = new URLSearchParams(isServer ? {} : window.location.search);

  const params = () => {
    const obj = {};
    for (const v of initial.keys()) obj[v] = initial.get(v);
    return obj;
  };

  const add = obj => {
    for (const key in obj) initial.append(key, obj[key]);
    const search = initial.length ? `?${initial.toString()}` : "";
    window.history.replaceState(null, "", window.location.pathname + search);
  };

  const setParams = arg => {
    if (typeof arg === "object") {
      initial = new URLSearchParams(); //reset
      add(arg);
    } else if (arg instanceof Function) {
      const old = params();
      initial = new URLSearchParams(); //reset
      add(arg(old));
    }
  };

  return [params, setParams];
}

[mtt-artis]

i think proxy is needed for reactivity
the current useSearchParams function could be updated
didn t try tbh

https://github.com/solidjs/solid-router/blob/HEAD/src/routing.ts#L100-L115

export const useSearchParams = <T extends Params>(): [
  T,
  (newParams: SetParams | ((current: Readonly<T>) => SetParams), options?: Partial<NavigateOptions>) => void
] => {
  const location = useLocation();
  const navigate = useNavigate();
  const setSearchParams = (params: SetParams | ((params: Readonly<T>) => SetParams), options?: Partial<NavigateOptions>) => {
    const searchString = typeof params === "function"
      ? untrack(() => mergeSearchString("", params(location.query as T)))
      : untrack(() => mergeSearchString(location.search, params));
    navigate(location.pathname + searchString + location.hash, {
      scroll: false,
      resolve: false,
      ...options
    });
  };
  return [location.query as T, setSearchParams];
};

But since it is a proxy, how would you deal this situation ?

setSearchParams(prev => {
  delete prev["something"];
  console.log(prev)
  return prev
});

Also on this line it should be:

: untrack(() => mergeSearchString("", params));

to make overwrite work

[mtt-artis]

you might be able to use produce https://www.solidjs.com/docs/latest/api#produce
again, i didn t try

---

: untrack(() => mergeSearchString("", params));

would be a breaking change

You think it's ok to design it like that ? The user should be able to delete key in this way imo:

setSearchParams(prev => {
  delete prev["something"];
  console.log(prev)
  return prev
});

[mtt-artis]

I don't really like the delete keyword in general so this doesn't bother me but that's a personal preference and I'm not a core member ;)

I think Ryan spoke about this pattern for store in one of his streams. I'll add the link if I find it.

Thank you for your contribution @mtt-artis.
I believe you didn't include this feature that could be a breaking change.

: untrack(() => mergeSearchString("", params));

would be a breaking change

setSearchParams should behave like state, where a plain object would overwrite existing params.

setSearchParams({ lonelykey: "i-overwrite" });

Imo if we don't want to change this there is no point to add callback

[mtt-artis]

Hey @rattleSSnake
I share the logic here but I don't think the breaking change is a good idea.
Noneless I'd be happy to make the change and refactor mergeSearchString if the reviewer asks me to do so.

With the update, can we somehow reset search params (by deleting every previous key I guess) ?

What happens if I do this: setSearchParams(prev => ({ omitprev: "what" }));

[mtt-artis]

This will reset search params

setSearchParams(prev => ({ }));