所以我在我的 Gatsby 应用程序(基本上是用 React 编写的)中使用 React 的上下文 API 来处理用户身份验证。我有两个使用该上下文的组件:dashboard和navBar。当我尝试登录和注销时,我的navBar行为会根据我的不同而有所不同userContext,但我dashboard不会回应。它是否与结构有关,例如navBar直接“子级”到layout,但dashboard不是?我假设不是,毕竟,这就是为什么我使用contextAPIthen just pass 一个普通的道具。
以下是代码:
//layout.js
import React, { useContext, useState, createContext } from "react"
import Navbar from "../components/navBar"
import {monitorAuth} from "../firebase/firebaseService"
export const UserStateContext = createContext(null)
export const SetUserContext = createContext()
const Layout = ({ children }) => {
const [user, setUser] = useState()
console.log(user)
monitorAuth(setUser)// everytime a layout component renders, it will grab a user if it is logged inthen setUser, then I will use it in the context
return (
<>
<UserStateContext.Provider value={user}>
<SetUserContext.Provider value={setUser}>
<div>
<SEO />
<Navbar />
<main>{children}</main>
</div>
</SetUserContext.Provider >
</UserStateContext.Provider>
</>
)
}
export default Layout
import React, { useState, useContext } from "react"
import AppBar from "@material-ui/core/AppBar"
import { signOut } from "../firebase/firebaseService"
import {UserStateContext} from "./layout"
export default function NavBar() {
const user = useContext(UserStateContext)
console.log(user) // when I log in/ log out, it will console.log the right user status, user/null
const renderMenu = () => {
return (
<>
{user? (
<>
<Button onClick={signOut}>Sign Out</Button>
<Button>My profile</Button>
</>)
:<Button>Sign In</Button> }
</>
)
}
return (
<AppBar position="static" className={classes.root}>
...
{renderMenu()}
...
</AppBar>
)
}
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