Target specific class using Styled Components React.js

Question

I am trying to add a theme to a navbar component. This component has a function for a sticky navbar to appear when scrolling down. I'm really stuck on targeting the 'sticky' class once the window is scrolled down. This worked with normal css but once I added it to the styled-component and removed it from the css its not working.

Maybe I'm not targeting the className 'sticky' correctly?

Any suggestions?? Thank you!

    export function Nav() {
      const [theme, setTheme] = useState("light");
      const [theTheme, setTheTheme] = useGlobal("onTheme");

      useEffect(() => {
        if (theTheme == false) setTheme("dark");
        else setTheme("light");

   
        window.addEventListener("scroll", function () {
        var header = document.querySelector("header");
        header.classList.toggle("sticky", window.scrollY > 0);
    });
  });

  return (
    <ThemeProvider theme={getTheme(theme)}>
      <Head>
        <Navbar>
          <NavLink></NavLink>
          <NavItem icon={<CaretIcon />}>
            <DropdownMenu />
          </NavItem>
        </Navbar>
      </Head>
    </ThemeProvider>
  );
}

I can target the 'sticky' class using normal CSS.

    header.sticky {
      background-color: rgb(31, 31, 37);
    }

I am trying to target 'sticky' using Styled Components.

    export const Head = styled.header`
      position: fixed;
      width: 100%;
      background-color: transparent;
      top: 0rem;
      transition: 0.6s;
      z-index: 100000;
      text-decoration: none;
      & .sticky {
        background-color: ${(props) => props.theme.hoverColor};
       } 
     `;

tmhao2005 · Accepted Answer · 2020-08-04 09:43:37Z

3

Looks like one unnecessary space between & .sticky ends up with applying for children instead of the header itself. The correct one is supposed to be:

export const Head = styled.header`
  position: fixed;
  width: 100%;
  background-color: transparent;
  top: 0rem;
  transition: 0.6s;
  z-index: 100000;
  text-decoration: none;

  &.sticky {
     background-color: ${(props) => props.theme.hoverColor};
  } 
`;

answered Aug 4, 2020 at 9:43

tmhao2005

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1 Comment

leapingllama Over a year ago

WOW I feel so dumb! Thank you so much it now works perfectly.

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