I'm trying out some state management in React using the Context API; what I want to achieve is that when I reach a specific route I load data from the server, store it in the context, and display it in the page itself. This is causing an infinite loop where the request to the server is done over and over (and never stops).
I'm trying to use higher order components for the provider and consumer logic:
import React, { Component, createContext } from 'react';
import RequestStatus from '../RequestStatus';
import { getData } from '../Api';
const dataCtx = createContext({
data: [],
getData: () => {},
requestStatus: RequestStatus.INACTIVE,
});
export default dataCtx;
export function dataContextProvider(WrappedComponent) {
return class extends Component {
constructor(props) {
super(props);
this.state = {
data: [],
getData: this.getData.bind(this),
requestStatus: RequestStatus.INACTIVE,
};
}
async getData() {
this.setState({ requestStatus: RequestStatus.RUNNING });
try {
const data = await getData();
this.setState({ data, requestStatus: RequestStatus.INACTIVE });
} catch (error) {
this.setState({ requestStatus: RequestStatus.FAILED });
}
}
render() {
return (
<dataCtx.Provider value={this.state}>
<WrappedComponent {...this.props} />
</dataCtx.Provider>
);
}
};
}
export function dataContextConsumer(WrappedComponent) {
return function component(props) {
return (
<dataCtx.Consumer>
{dataContext => <WrappedComponent dataCtx={dataContext} {...props} />}
</dataCtx.Consumer>
);
};
}
the provider is the App component itself:
import React, { Fragment } from 'react';
import { dataContextProvider } from './contexts/DataContext';
import { userContextProvider } from './contexts/UserContext';
import AppRoutes from './AppRoutes';
function App() {
return (
<Fragment>
<main>
<AppRoutes />
</main>
</Fragment>
);
}
export default userContextProvider(dataContextProvider(App));
and here's the consumer that causes the loop:
import React, { Component } from 'react';
import RequestStatus from './RequestStatus';
import { dataContextConsumer } from './contexts/DataContext';
class DataList extends Component {
async componentDidMount() {
const { dataCtx: { getData } } = this.props;
await getData();
}
render() {
const { dataCtx: { data, requestStatus } } = this.props;
return (
{/* display the data here */}
);
}
}
export default dataContextConsumer(DataList);
I've tried switching away from the HOC for the consumer, but it didn't help:
import React, { Component } from 'react';
import RequestStatus from './RequestStatus';
import dataCtx from './contexts/DataContext';
class DataList extends Component {
async componentDidMount() {
const { getData } = this.context;
await getData();
}
render() {
const { data, requestStatus } = this.context;
return (
{/* display the data here */}
);
}
}
DataList.contextType = dataCtx;
export default DataList;
The DataList is only one of the pages from where I'd like to trigger a context update.
I'm guessing that the Provider is causing a re-render of the whole App, but why? Where am I going wrong, and how can I fix this?