我有两个组件:
订单 - 获取一些数据并显示它。
ErrorHandler - 如果服务器发生错误,模式将显示并显示一条消息。
ErrorHandler 组件正在扭曲订单组件
我使用 axios 包加载订单组件中的数据,我使用 axios 拦截器来设置有关错误的状态,并在组件卸载后弹出。
当我来回导航到订单组件时,我有时会在控制台中收到错误消息:
Warning: Can't call setState (or forceUpdate) on an unmounted component. This is a no-op, but it indicates a memory leak in your application. To fix, cancel all subscriptions and asynchronous tasks in the componentWillUnmount method.
in Orders (at ErrorHandler.jsx:40)
in Auxiliary (at ErrorHandler.jsx:34)
in _class2 (created by Route)
我试图通过我以前的案例解决它React Warning: Can only update a mounted or mounting component但在这里我不能让检查员制作 axios token 。以前有人解决过这个问题吗?
这是我的组件:
订单:
import React, { Component } from 'react';
import api from '../../api/api';
import Order from '../../components/Order/Order/Order';
import ErrorHandler from '../../hoc/ErrorHandler/ErrorHandler';
class Orders extends Component {
state = {
orders: [],
loading: true
}
componentDidMount() {
api.get('/orders.json')
.then(response => {
const fetchedOrders = [];
if (response && response.data) {
for (let key in response.data) {
fetchedOrders.push({
id: key,
...response.data[key]
});
}
}
this.setState({ loading: false, orders: fetchedOrders });
})
.catch(error => {
this.setState({ loading: false });
});
}
render() {
return (
<div>
{this.state.orders.map(order => {
return (<Order
key={order.id}
ingrediencies={order.ingrediencies}
price={order.price} />);
})}
</div>
);
}
}
export default ErrorHandler(Orders, api);
错误处理程序:
import React, { Component } from 'react';
import Auxiliary from '../Auxiliary/Auxiliary';
import Modal from '../../components/UI/Modal/Modal';
const ErrorHandler = (WrappedComponent, api) => {
return class extends Component {
requestInterceptors = null;
responseInterceptors = null;
state = {
error: null
};
componentWillMount() {
this.requestInterceptors = api.interceptors.request.use(request => {
this.setState({ error: null });
return request;
});
this.responseInterceptors = api.interceptors.response.use(response => response, error => {
this.setState({ error: error });
});
}
componentWillUnmount() {
api.interceptors.request.eject(this.requestInterceptors);
api.interceptors.response.eject(this.responseInterceptors);
}
errorConfirmedHandler = () => {
this.setState({ error: null });
}
render() {
return (
<Auxiliary>
<Modal
show={this.state.error}
modalClosed={this.errorConfirmedHandler}>
{this.state.error ? this.state.error.message : null}
</Modal>
<WrappedComponent {...this.props} />
</Auxiliary>
);
}
};
};
export default ErrorHandler;
最佳答案
我认为这是由于触发 setState 的异步调用所致,即使组件未安装也可能发生。为防止这种情况发生,您可以使用某种标志:
state = {
isMounted: false
}
componentDidMount() {
this.setState({isMounted: true})
}
componentWillUnmount(){
this.state.isMounted = false
}
然后用 if 包装你的 setState 调用:
if (this.state.isMounted) {
this.setState({ loading: false, orders: fetchedOrders });
}
编辑 - 添加功能组件示例:
function Component() {
const [isMounted, setIsMounted] = React.useState(false);
useEffect(() => {
setIsMounted(true);
return () => {
setIsMounted(false);
}
}, []);
return <div></div>;
}
export default Component;
关于javascript - react 警告 : Can't call setState (or forceUpdate) on an unmounted component,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/51609276/