'React Context is not working as expected: Unable to change the value of shared variable
I made a context to share the value of the variable "clicked" throughout my nextjs pages, it seems to give no errors but as you can see the variable's value remains FALSE even after the click event. It does not change to TRUE. This is my first time working with context, what am I doing wrong? I'm using typescript PS: After the onClick event the log's number shoots up by 3 or 4, is it being executed more than once, but how?
controlsContext.tsx
import { createContext, FC, useState } from "react";
export interface MyContext {
clicked: boolean;
changeClicked?: () => void;
}
const defaultState = {
clicked: false,
}
const ControlContext = createContext<MyContext>(defaultState);
export const ControlProvider: FC = ({ children }) => {
const [clicked, setClicked] = useState(defaultState.clicked);
const changeClicked = () => setClicked(!clicked);
return (
<ControlContext.Provider
value={{
clicked,
changeClicked,
}}
>
{children}
</ControlContext.Provider>
);
};
export default ControlContext;
Model.tsx
import ControlContext from "../contexts/controlsContext";
export default function Model (props:any) {
const group = useRef<THREE.Mesh>(null!)
const {clicked, changeClicked } = useContext(ControlContext);
const handleClick = (e: MouseEvent) => {
//e.preventDefault();
changeClicked();
console.log(clicked);
}
useEffect(() => {
console.log(clicked);
}, [clicked]);
useFrame((state, delta) => (group.current.rotation.y += 0.01));
const model = useGLTF("/scene.gltf ");
return (
<>
<TransformControls enabled={clicked}>
<mesh
ref={group}
{...props}
scale={clicked ? 0.5 : 0.2}
onClick={handleClick}
>
<primitive object={model.scene}/>
</mesh>
</TransformControls>
</>
)
}
_app.tsx
import {ControlProvider} from '../contexts/controlsContext';
function MyApp({ Component, pageProps }: AppProps) {
return (
<ControlProvider>
<Component {...pageProps}
/>
</ControlProvider>
)
}
export default MyApp
Solution 1:[1]
A few things -
setClicked((prev) => !prev);
instead of
setClicked(!clicked);
As it ensures it's not using stale state. Then you are also doing -
changeClicked
But it should be -
changeClicked();
Lastly, you cannot console.log(clicked) straight after calling the set state function, it will be updated in the next render
Sources
This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.
Source: Stack Overflow
| Solution | Source |
|---|---|
| Solution 1 | andy mccullough |

