问题
I've built a ReactJS component library that I use for multiple projects installed via an NPM package using a sim link. I want to use the context API to pass data from a parent component served from the component library to my base project to be consumed by multiple consumer components also served from the component library. When I try the context is always undefined in my child components.
If I place my consumer component in my provider component within my library it works like a champ but this defeats what I'm trying to achieve. If I export both the provider and the consumer to my base project the consumer doesn't see the provider.
This is from my base project
import { Screen, COD, GenericSocketServer } from 'component-library'
export default class View extends React.PureComponent {
render() {
return (
<Screen className="screen odmb1">
<GenericSocketServer>
<COD />
</GenericSocketServer>
</Screen>
)
}
}
This is my provider code exported from my 'component-library'
import React from 'react';
import MyContext from "./context";
import COD from './../cod';
export default class GenericSocketServer extends React.Component {
render() {
return (
<MyContext.Provider value={{ foo: 'bar' }}>
<COD />
{this.props.children}
</MyContext.Provider>
);
}
}
This is my content code used in 'component-library'
import React from 'react'
const MyContext = React.createContext()
export default MyContext
This is my consumer component exported from 'component-library'
import MyContext from "../GenericSocketServer/context"
class COD extends React.Component {
render() {
return (
<React.Fragment>
<MyContext.Consumer>
{(context) => {
/*
context comes back undefined
I expect { foo: 'bar' }
*/
console.log('context :', context)
return (
<p>This should work</p>
)}}
</MyContext.Consumer>
</React.Fragment>
)
}
}
Context always comes back undefined as if it doesn't see the parent provider. I think I'm ether doing something wrong initializing the context myself or for some reason the two components I'm importing just don't share the same context. Please help!! Not sure if I should give up on this and just use redux.
来源:https://stackoverflow.com/questions/57976672/react-context-api-not-working-from-custom-npm-component-library