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How can I pass a server component/action to a client component?

Answered
Exotic Shorthair posted this in #help-forum
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Exotic ShorthairOP
So I've been working off of this nextjs example in github that uses Supabase (https://github.com/vercel/next.js/tree/f6c4c2768bae701df144705510949d97f11109a9/examples/with-supabase) and I'm stuck on one part when trying to expand upon the example. I essentially want to have my topnav to worth with useState, and I put the AuthButton in the topnav as well. So now I get an error saying that You're importing a component that needs next/headers. That only works in a Server Component but one of its parents is marked with "use client", so it's a Client Component.

Here is a sample of my code and it seems to break on the line where I have {isSupabaseConnected && <AuthButton />}
... TopNav {
  const cookieStore = cookies();

  const canInitSupabaseClient = () => {
    try {
      createClient(cookieStore);
      return true;
    } catch (e) {
      return false;
    }
  };

  const isSupabaseConnected = canInitSupabaseClient();

  return (
      <div> ...
          {isSupabaseConnected && <AuthButton />}
        </div>
      </div>
      <MobileMenu isSupabaseConnected={isSupabaseConnected} />
    </div>
  );
};

"use client";
type MobileMenuProps = {
  isSupabaseConnected: boolean;
};

const MobileMenu = ({ isSupabaseConnected }: MobileMenuProps) => {
  const [isOpen, setIsOpen] = useState(false);

  console.log(isSupabaseConnected);

  const toggleMenu = () => {
    setIsOpen(!isOpen);
  };

  return (
    <div className="mobile-topnav">
      <div className="mobile-topnav-items">
        <div className="mobile-topnav-left">
          <Link href="/">
            <CollectionCoffeeLogo className="mobile-topnav-logo" />
          </Link>
        </div>
        <div className="mobile-topnav-right">
          <button onClick={toggleMenu}>
            {isOpen ? <ExitIcon /> : <MenuIcon />}
          </button>
        </div>
      </div>
      {isOpen ? <div>{isSupabaseConnected && <AuthButton />}</div> : null}
    </div>
  );
};

export default MobileMenu;
Answered by Ray
Hi, when a component is imported into a client component, it will become a client component also. The reason why you get the error is you are trying to use headers() in a client component.

you could try to pass the <AuthButton /> as a children of <MobileMenu /> like this
<MobileMenu>
{isSupabaseConnected && <AuthButton />}
</MobileMenu>

Then in the <MobileMenu />, render it by the children props
{children}


learn more in here
https://nextjs.org/docs/app/building-your-application/rendering/composition-patterns#supported-pattern-passing-server-components-to-client-components-as-props
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9 Replies

@Exotic Shorthair So I've been working off of this nextjs example in github that uses Supabase (https://github.com/vercel/next.js/tree/f6c4c2768bae701df144705510949d97f11109a9/examples/with-supabase) and I'm stuck on one part when trying to expand upon the example. I essentially want to have my topnav to worth with `useState`, and I put the `AuthButton` in the topnav as well. So now I get an error saying that `You're importing a component that needs next/headers. That only works in a Server Component but one of its parents is marked with "use client", so it's a Client Component.` Here is a sample of my code and it seems to break on the line where I have `{isSupabaseConnected && <AuthButton />}` ... TopNav { const cookieStore = cookies(); const canInitSupabaseClient = () => { try { createClient(cookieStore); return true; } catch (e) { return false; } }; const isSupabaseConnected = canInitSupabaseClient(); return ( <div> ... {isSupabaseConnected && <AuthButton />} </div> </div> <MobileMenu isSupabaseConnected={isSupabaseConnected} /> </div> ); }; "use client"; type MobileMenuProps = { isSupabaseConnected: boolean; }; const MobileMenu = ({ isSupabaseConnected }: MobileMenuProps) => { const [isOpen, setIsOpen] = useState(false); console.log(isSupabaseConnected); const toggleMenu = () => { setIsOpen(!isOpen); }; return ( <div className="mobile-topnav"> <div className="mobile-topnav-items"> <div className="mobile-topnav-left"> <Link href="/"> <CollectionCoffeeLogo className="mobile-topnav-logo" /> </Link> </div> <div className="mobile-topnav-right"> <button onClick={toggleMenu}> {isOpen ? <ExitIcon /> : <MenuIcon />} </button> </div> </div> {isOpen ? <div>{isSupabaseConnected && <AuthButton />}</div> : null} </div> ); }; export default MobileMenu;
That just means the parent of that component is use client. you'll have to make it use server.
You can use client in client component
@Exotic Shorthair So I've been working off of this nextjs example in github that uses Supabase (https://github.com/vercel/next.js/tree/f6c4c2768bae701df144705510949d97f11109a9/examples/with-supabase) and I'm stuck on one part when trying to expand upon the example. I essentially want to have my topnav to worth with `useState`, and I put the `AuthButton` in the topnav as well. So now I get an error saying that `You're importing a component that needs next/headers. That only works in a Server Component but one of its parents is marked with "use client", so it's a Client Component.` Here is a sample of my code and it seems to break on the line where I have `{isSupabaseConnected && <AuthButton />}` ... TopNav { const cookieStore = cookies(); const canInitSupabaseClient = () => { try { createClient(cookieStore); return true; } catch (e) { return false; } }; const isSupabaseConnected = canInitSupabaseClient(); return ( <div> ... {isSupabaseConnected && <AuthButton />} </div> </div> <MobileMenu isSupabaseConnected={isSupabaseConnected} /> </div> ); }; "use client"; type MobileMenuProps = { isSupabaseConnected: boolean; }; const MobileMenu = ({ isSupabaseConnected }: MobileMenuProps) => { const [isOpen, setIsOpen] = useState(false); console.log(isSupabaseConnected); const toggleMenu = () => { setIsOpen(!isOpen); }; return ( <div className="mobile-topnav"> <div className="mobile-topnav-items"> <div className="mobile-topnav-left"> <Link href="/"> <CollectionCoffeeLogo className="mobile-topnav-logo" /> </Link> </div> <div className="mobile-topnav-right"> <button onClick={toggleMenu}> {isOpen ? <ExitIcon /> : <MenuIcon />} </button> </div> </div> {isOpen ? <div>{isSupabaseConnected && <AuthButton />}</div> : null} </div> ); }; export default MobileMenu;
Hi, when a component is imported into a client component, it will become a client component also. The reason why you get the error is you are trying to use headers() in a client component.

you could try to pass the <AuthButton /> as a children of <MobileMenu /> like this
<MobileMenu>
{isSupabaseConnected && <AuthButton />}
</MobileMenu>

Then in the <MobileMenu />, render it by the children props
{children}


learn more in here
https://nextjs.org/docs/app/building-your-application/rendering/composition-patterns#supported-pattern-passing-server-components-to-client-components-as-props
Answer
@Exotic Shorthair so what would my MobileMenu look like if i wanted to render the AuthButton? `children.AuthButton`?
"use client";
type MobileMenuProps = {
  children: ReactNode;
};

const MobileMenu = ({ children }: MobileMenuProps) => {
  const [isOpen, setIsOpen] = useState(false);

  console.log(isSupabaseConnected);

  const toggleMenu = () => {
    setIsOpen(!isOpen);
  };

  return (
    <div className="mobile-topnav">
      <div className="mobile-topnav-items">
        <div className="mobile-topnav-left">
          <Link href="/">
            <CollectionCoffeeLogo className="mobile-topnav-logo" />
          </Link>
        </div>
        <div className="mobile-topnav-right">
          <button onClick={toggleMenu}>
            {isOpen ? <ExitIcon /> : <MenuIcon />}
          </button>
        </div>
      </div>
      {children}
    </div>
  );
};

export default MobileMenu;
Exotic ShorthairOP
thanks for typing out that example! it seems to work as in it doesn't throw me any errors anymore, now i just dont see the AuthButton component when I try to open the mobile menu. However, that may be due to a CSS issue of mine but thanks for showing me how to pass down the server components to client components, that helps a lot 🙂
Exotic ShorthairOP
yes it was a CSS issue with why it wasn't showing up 😄 i got it working now!