[英]How to get value of a component to another component
我正在創建一個項目,我需要在其中獲取組件 state 值的值到另一個組件。
我怎樣才能得到價值?
react dropdown
中設置的。這是一個按鈕。Link or Route
to A
下拉列表,這就是為什么我無法使用useParams()
獲取它B
組件中設置值,它將使用傳遞的語言獲取數據。language
的值 state 發送到B
const A = () => {
const [language, setLanguage] = useState('en');
return (
<Navbar expand="xl" bg='light' expand={false}>
<Container>
<DropdownButton id="dropdown-basic-button" title={<MdOutlineLanguage />}>
<Dropdown.Item as="button" onClick={() => setLanguage('en')}>English</Dropdown.Item>
<Dropdown.Item as="button" onClick={() => setLanguage('ar')}>العربية</Dropdown.Item>
<Dropdown.Item as="button" onClick={() => setLanguage('bn')}>বাংলা</Dropdown.Item>
</DropdownButton>
</Container>
</Navbar>
)
};
export default A
A
state 值並將其設置為B
state。然后傳遞給useGetDataQuery
並獲取數據。const B = () => {
let [language, setLanguage] = useState('en')
const { data } = useGetDataQuery({language })
return (
<>
</>
)
}
export default B
我正在使用readux & @reduxjs/toolkit
來存儲獲取數據。 我可以將我的language
數據存儲到這里嗎? 比起如何從我的組件的任何地方到達。
react-rotuer-dom
v6export default configureStore({
reducer: {
[dataOne.reducerPath]: dataOne.reducer,
[data2.reducerPath]: dataTwo.reducer,
},
middleware: (getDefaultMiddleware) =>
getDefaultMiddleware({
serializableCheck: false
}).concat([dataOne.middleware, dataTwo.middleware]),
})
也許不使用useState
,您可以通過使用useContext 使用全局 state因為我認為您的language
將在多個地方用作請求正文,當然要編輯 state 值,您可以將它與useReducer結合使用。
// UPDATE
MyContext
import { useReducer, useContext, createContext } from "react";
const initialValue = {
language: "id"
// other: "value",
};
const AppContext = createContext(initialValue);
const AppReducer = (state, action) => {
switch (action.type) {
case "CHANGE_LANGUAGE":
return {
...state,
...action.payload
};
default:
return state;
}
};
const MyContext = ({ children }) => {
const [state, dispatch] = useReducer(AppReducer, initialValue);
return (
<AppContext.Provider value={[state, dispatch]}>
{children}
</AppContext.Provider>
);
};
export const useAppContext = () => useContext(AppContext);
export default MyContext;
這是稍后在App.js
中使用的context
和reducer
組件
App.js
import A from "./A";
import B from "./B";
import MyContext from "./MyContext";
import "./styles.css";
export default function App() {
return (
<MyContext>
<div className="App">
<A />
<B />
</div>
</MyContext>
);
}
A.js
import { useAppContext } from "./MyContext";
const A = () => {
const [globalState, dispatch] = useAppContext();
const onChange = (e) => {
dispatch({
type: "CHANGE_LANGUAGE",
payload: {
[e.target.name]: e.target.value
}
});
};
return (
<>
<p>Start Of Component A </p>
<input value={globalState.language} name="language" onChange={onChange} />
<p>End Of Component A </p>
</>
);
};
export default A;
B.js
import { useAppContext } from "./MyContext";
const B = () => {
const [globalState, dispatch] = useAppContext();
return (
<>
<p>Start Of Component B </p>
<h2>Language Val : {globalState.language}</h2>
<p>End Of Component B </p>
</>
);
};
export default B;
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