I am using [email protected] and [email protected] that should support react Context
and trying to run a simple example same as the react-context:
app.js
import React, { Component } from 'react';
import AppManger from './components/AppManger';
import './App.css';
export const ThemeContext = React.createContext({a1:'a1'});
class App extends Component {
render() {
return (
<div className="App">
<h1>Manage Storefront Services Products</h1>
<ThemeContext.Provider value="dark">
<AppManger />
</ThemeContext.Provider>
</div>
);
}
}
export default App;
AppManger.js(has no context reference)
import React, { Component } from 'react'
import SearchBar from './SearchBar';
export default class AppManger extends Component {
constructor(props) {
super(props);
this.onSearchBarChange = this.onSearchBarChange.bind(this);
this.state = {
searchValue: '',
errorLoading: false,
errorObj: null,
}
}
onSearchBarChange(e) {
e.persist();
this.setState({ searchValue: e.target.value });
}
render() {
return (
<div>
<a href="/subsadmin/saml/logout">Log out</a>
<SearchBar onSearchBarChange={this.onSearchBarChange} inAttrView={this.state.onAttrPage} />
</div>
)
}
}
And the SearchBar.js where I want to use Context:
import React, { Component } from 'react';
import ThemeContext from '../App';
export default class SearchBar extends Component {
constructor(props) {
super(props);
this.state = {
showModal: false,
showAttrModal: false
};
};
componentDidMount(){
console.log(this.context); //{}
}
render() {
const contextType = ThemeContext;
console.log(contextType); //{}
return (
<div>
{contextType} /*'contextType' is not defined no-undef */
<input type="text" style={searchBoxStyle} className="form-control" onChange={this.props.onSearchBarChange} placeholder="Search for..." id="sku" name="sku" />
</div>
)
}
}
If I run the app I get Line 44: 'contextType' is not defined no-undef
in SearchBar.js if I remove this line I get {}
when I logging the this.context
.
You aren't correctly using context, as you need to define it as a static property of the class and import it as a named import since you have exported it as a named import
import { ThemeContext } from '../App';
export default class SearchBar extends Component {
constructor(props) {
super(props);
this.state = {
showModal: false,
showAttrModal: false
};
};
static contextType = ThemeContext;
componentDidMount(){
console.log(this.context); //{}
}
render() {
console.log(this.contextType); //{}
return (
<div>
{contextType} /*'contextType' is not defined no-undef */
<input type="text" style={searchBoxStyle} className="form-control" onChange={this.props.onSearchBarChange} placeholder="Search for..." id="sku" name="sku" />
</div>
)
}
}
You imported App
instead of ThemeContext
.
use import { ThemeContext } from '../App.js
;
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