so i'm creating my first fullstack website and once a user signs in it gets stored in the localStorage and i want to display the name of the user in my header once he is logged in but my header is not re rendering so nothing happens : this is the header before logging in header
and this is how i want it to Be after signing in : header after logging in this is my Layout code:
import "../assets/sass/categoriesbar.scss";
import Header from "./Header/Header";
const Layout = (props) => {
return (
<>
<Header/>
<main>
{ props.children}
</main>
</>
);
}
export default Layout;
and this is the toolBar in my Header :
const ToolBar = () => {
const history = useHistory();
let currentUser= JSON.parse(localStorage.getItem("user-info"));
const logoutHandler = () => {
localStorage.clear("user-info");
history.push("/login");
};
return (
<>
<div className={classes.NavigationBar}>
<h1>
<Link to="/">Pharmashop</Link>
</h1>
<NavLinks logout={logoutHandler}/>
{localStorage.getItem("user-info")?
<h5>Welcome {currentUser.name} !</h5>
:
<RegisterButton />
}
</div>
</>
);
};
export default ToolBar;
please help me it's frustrating
PS: this is my first stackoverflow question sorry if it's unorganized and unclear and sorry for my bad english.
Hazem, welcome to Stack Overflow.
In react, if you want the component to re-render when some data changes, that info must be in the component state. In your code the current user is a const, not bind to the component's state. This is how it could auto re-render when the user logs in:
const ToolBar = () => {
const [currentUser, setCurrentUser] = useState(JSON.parse(localStorage.getItem("user-info")));
const logoutHandler = () => {
localStorage.clear("user-info");
history.push("/login");
};
return (
<>
<div className={classes.NavigationBar}>
<h1>
<Link to="/">Pharmashop</Link>
</h1>
<NavLinks logout={logoutHandler}/>
{currentUser?
<h5>Welcome {currentUser.name} !</h5>
:
<RegisterButton />
}
</div>
</>
);
};
export default ToolBar;
See more about state in the official documentation.