I am working on a React project, and I am utilizing the react-select library. However, I am unable to use it as it crashes my app. This is probably a very simple mistake, but I can't seem to figure it out. Any help is greatly appreciated!
Here is the error message:
Uncaught Error: Invalid hook call. Hooks can only be called inside of the body of a function component. This could happen for one of the following reasons:
You might have mismatching versions of React and the renderer (such as React DOM)
You might be breaking the Rules of Hooks
You might have more than one copy of React in the same app
Here is the relevant code:
import React, { useState, useEffect, Component} from 'react';
import Select from 'react-select'
export default function Card(props) {
return (
<Card>
<Select />
</Card>
);
}
Related
Developing teams application using react - I am trying to use Ag grid react to design sample table. I have added code and while running it it throws errors as follows.
Error: Invalid hook call. Hooks can only be called inside of the body of a function component. This could happen for one of the following reasons: 1. You might have mismatching versions of React and the renderer (such as React DOM) 2. You might be breaking the Rules of Hooks 3. You might have more than one copy of React in the same app See https://reactjs.org/link/invalid-hook-call for tips about how to debug and fix this problem.
Below the code snippet
import React from 'react';
import {AgGridReact} from 'ag-grid-react';
import 'ag-grid-community/dist/styles/ag-grid.css';
import 'ag-grid-community/dist/styles/ag-theme-alpine.css';
export default function Project() {
return (
<div className="ag-theme-alpine" style={{height: 400, width: 600}}>
<AgGridReact>
</AgGridReact>
</div>
)
};
Error is due to the duplicate version of react in the application folder - deleting the node_module folder and ran npm install solved my issue.
getting in valid hook error in a re write of a clients app... (upgrading code)
mobx 6.3.8 mobx react 7.2.1 and mobx-state-tree 5.0.5
React 17.0.1 RN 0.64.3
i feel like the error is here. i googled the code line for use stores and it led me to the deprecated site... i dont know where to find new handling in the https://mobx.js.org/react-integration.html site... what would this be called?
import { createContext, useContext } from "react"
import { RootStore } from "./root-store"
const RootStoreContext = createContext<RootStore>({} as RootStore)
const RootStoreProvider = RootStoreContext.Provider
// hook error here? // export const useStores = () => useContext(RootStoreContext);
error:
Error: Invalid hook call. Hooks can only be called inside of the body of a function component. This could happen for one of the following reasons:
You might have mismatching versions of React and the renderer (such as React DOM)
You might be breaking the Rules of Hooks
You might have more than one copy of React in the same app
See https://reactjs.org/link/invalid-hook-call for tips about how to debug and fix this problem.
adding more context... rootstore file
import { Instance, SnapshotOut, types } from "mobx-state-tree"
import { creatMediaPlayerModel } from "../../models/media-player"
import { createUserModel } from "../../models/user"
import { createContentModel } from "../../models/content"
export const RootStoreModel = types.model("RootStore", {
mediaPlayerStore: creatMediaPlayerModel(),
userStore: createUserModel(),
contentStore: createContentModel(),
})
export type RootStore = Instance<typeof RootStoreModel>
export type RootStoreSnapshot = SnapshotOut<typeof RootStoreModel>
From that error message:
Hooks can only be called inside of the body of a function component.
You are not calling a hook from inside the body of a function component. So you are breaking the rules of hooks.
According the rules of hooks you can only call a hook from the top level of a react function component. If you are not inside a functional component, then you cannot use a react hook*.
From the docs:
Don’t call Hooks inside loops, conditions, or nested functions. Instead, always use Hooks at the top level of your React function, before any early returns. By following this rule, you ensure that Hooks are called in the same order each time a component renders. That’s what allows React to correctly preserve the state of Hooks between multiple useState and useEffect calls.
That means you need to call useStores from within a functional component.
Something like:
function MyComponent() {
const myStores = useStores()
// render component with data from stores here
return <>{myStore.myData}</>
}
* The exception, sort of, is a custom hook which can call other hooks. Your useStores here is a custom hook. So it's fine to call useContext from that custom hook.
But that custom hook must obey the same usage rules as the built in hooks, so all hooks are called from the body of a function component, there is just function in between.
I am new to React, and I am trying to integrate React hooks in some of the projects that the React course I follow uses. This example is supposed to add an input field which sets the background color of a page. When I load the page, after 1 second, I get the following error
src\App.js
Line 16:43: React Hook "useBackgroundColor" cannot be called inside a callback. React Hooks must be called in a React function component or a custom React Hook function react-hooks/rules-of-hooks
Search for the keywords to learn more about each error.
What might be the issue here? I haven't managed to figure it out.
Thank you!
import logo from "./logo.svg";
import "./App.css";
import UserItem from "./UserItem";
import React, { useState } from "react";
function App() {
const [backgroundColor, useBackgroundColor] = useState("purple");
return (
<div className="App" style={{ background: backgroundColor }}>
<h1>Lista utilziatori:</h1>
<input type="color" onChange={event => useBackgroundColor(event.target.value)} />
</div>
);
}
export default App;
Functions prefixed with use are interpreted by React to be hooks. But here, your useBackgroundColor isn't actually a hook, it's just a state setter function. Rename it to something more appropriate - the usual convention is to prefix the state variable with set. Change
const [backgroundColor, useBackgroundColor] = useState("purple");
to
const [backgroundColor, setBackgroundColor] = useState("purple");
and then reference setBackgroundColor in your code.
I am using NextJS for server side rendering & I am trying to use useState hook inside a component which is throwing :
Error:
Error: Invalid hook call. Hooks can only be called inside of the body of a function component. This could happen for one of the following reasons:
1. You might have mismatching versions of React and the renderer (such as React DOM)
2. You might be breaking the Rules of Hooks
3. You might have more than one copy of React in the same app
My code:
import { useState } from 'react';
const Banner = ({ movies }) => {
const [movie, setMovie] = useState(movies);
return (
<header>
<h1> Banner </h1>
</header>
)
}
export default Banner;
Directory Tree
/components/Banner.js
/pages
Getting same error when i use useEffect() like :
import React, {useEffect} from 'react'
I have a React app in Typescript where I'm trying to use the useState hook in one section and running into trouble. I've reduced the code to the following minimal example:
projects-loader.tsx:
import React from "react";
import { render } from "react-dom";
import MoreProjectsTable from "./components/MoreProjectsTable";
export const projects = (): void => {
const moreProjectsRootEl = document.getElementById(
"react-more-projects-table-root"
);
render(<MoreProjectsTable/>, moreProjectsRootEl);
};
export default projects;
MoreProjectsTable.tsx:
import React, { ReactElement, useState } from "react";
import MoreProjectsRow from "./MoreProjectsRow";
const MoreProjectsTable = (): ReactElement<HTMLElement> => {
useState();
return (<div/>);
};
export default MoreProjectsTable;
But when I call projects() it fails with the error "Hooks can only be called inside the body of a function component."
I understand from research that there are three common reasons for this error:
Violating the Rules Of Hooks
Mismatching versions of React and React-DOM
Multiple copies of React in the same app
Regarding #1, I don't see where I'm violating the Rules Of Hooks--it looks to me like I'm calling useState from the top-level of a function component, all right.
Regarding #2, I verified that React and React-DOM are both v16.8.1.
Regarding #3, I verified via the method described on this page that that is not the case.
Can anyone suggest anything else I might try? I'm very new to React so no suggestion is too obvious.
About one minute after I posted this question, a co-worker figured it out. This app is running on a Web page and, without noticing it, I was loading the top-level script itself from two different places. A variation on scenario #3 then, apparently.