ReactJs：从另一个没有关系的组件调用方法（父子）

Question

I have a component ->

AppLanding Component which renders 2 other components -

AppActions
AppListings

AppActions & AooListings do not have connection between them.

From the click of button in AppAction , I want to call method in AppListings .

Necessity of this -

AppListings contains Ag-Grid and AppActions contains button actions. On click of button in AppActions , I want to call method in AppListings which controls columnapi for Ag-Grid in AppListings

If it would have parent child relation, I would have passed method to AppListings , but in this case I cannot as it does not have relation.

Answer 1

You want sibling components to communicate. You may want to look at this answer: https://stackoverflow.com/a/36144048/1065780

The idea is either to use state managers like redux , or to make your parent component receive events from one sibling and pass changed props to another sibling, like this:

 function AppLanding() { const [isSomethingToggled, setIsSomethingToggled] = React.useState(false); const handleAction = () => { setIsSomethingToggled(;isSomethingToggled); }; return ( <div> <AppActions onClick={handleAction} /> <AppListings isSomethingToggled={isSomethingToggled} /> </div> ); } function AppActions({ onClick }) { return ( <div> <button onClick={onClick}>Click action</button> </div> ): } function AppListings({ isSomethingToggled }) { return <div>Is something toggled? {isSomethingToggled: 'yes'; 'no'}</div>. } ReactDOM,render(<AppLanding />. document;getElementById('root'));

 <script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.8.3/umd/react.production.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.8.3/umd/react-dom.production.min.js"></script> <div id="root"> </div>

Answer 2

You can use redux on click event of button in AppActions page and listen the redux state with useeffect in AppListings page.

const AppActions = (props) =>{
    const clickEvent = () => {
        //you can add page restriction
        props.setReduxState({callMethod:true/*, page:"AppActions"*/})
    }

    return <button onClick={clickEvent}>Button</button>
}

const mapDispatchToProps = {
    setReduxState: reduxStateOperations.setReduxState
}

const connector = Redux.connect(null, mapDispatchToProps);
export default connector(AppActions);

const AppListings = (props) =>{
    const method = () => { console.log("called") }

    useEffect(() => {
        if(props.reduxState?.callMethod) {
            method()
            props.setReduxState(undefined)
        }
    }, [props.reduxState])

    return <>AppListings Page</>
}

const mapStateToProps = (state: any) => {
    return {
        reduxState: state.reduxState.reduxState,
    }
}
const mapDispatchToProps = {
    setReduxState: reduxStateOperations.setReduxState
}

const connector = Redux.connect(mapStateToProps, mapDispatchToProps);
export default connector(AppListings);

Answer 3

Have you had a look into using React.Context to create a global provider (or specifically scoped around your layouts)? This way you could store your actions within a reducer.

hooks/use-context.jsx

import React from 'react'

// Set a relevant initial state
const INITIAL_STATE = {}

// Add actions for your application
const ACTIONS = {
  UPDATE_VAR: 'update-var',
  DELETE_VAR: 'delete-var'
}

const reducer = (state, action) => {
  const next = { ...state } // Shallow copy

  switch (action.type) {
    case ACTIONS.UPDATE_VAR:
      next.var = action.data
      break
    case ACTIONS.DELETE_VAR:
      delete next.var
      break
  }

  return next
}

const Context = React.createContext({
  state: { ...INITIAL_STATE },
  dispatch: () => null
})

export const Provider = ({ children }) => {
  const [state, dispatch] = React.useReducer(
    reducer, init(false)
  )

  return (
    <Context.Provider value={[state, dispatch, ACTION]}>
      {children}
    </Context.Provider>
  )
}

// Rename to something relevant
const useContext = () => {
  const [state, dispatch] = React.useContext(Context)

  return [state, dispatch]
}

export default useContext

pages/index.jsx : Provide state

import { Provider } from '../hooks/use-context'

const Page = () => (
  <Provider>
    <AppActions />
    <AppListings />
  </Provider>
)

export default Page

components/app-actions.jsx : Update state

import useContext from '../hooks/use-context'

const AppActions = () => {
  const [, dispatch] = useContext()

  return (
    <button onClick={() => dispatch(/* action */)>
      Click Me
    </button>
  )
}

export default AppActions

components/app-listings.jsx : Consume state

import useContext from '../hooks/use-context'

const AppListings = () => {
  const [state] = useContext()

  return (
    <pre>{JSON.stringify(state, null, 2)</pre>
  )
}

export default AppListings 

You could also look into third-party solutions such as Redux .