我有2个组成部分:
订单-获取一些数据并显示。
ErrorHandler-如果服务器上发生某些错误,则会显示一个模式并显示一条消息。
ErrorHandler组件正在扭曲订单组件
我正在使用axios包在Orders组件中加载数据,并且我使用axios拦截器来设置有关错误的状态,并在卸载组件后弹出。
当我前后导航到订单组件时,有时会在控制台中出现错误:
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React Warning: Can only update a mounted or mounting component解决此问题,但在这里,检查员无法制作axios令牌。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);
ErrorHandler:
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;
答案 0 :(得分:5)
我认为这是由于异步调用触发了setState,即使未安装组件也可能发生。为了防止这种情况的发生,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包裹您的setState调用:
if (this.state.isMounted) {
this.setState({ loading: false, orders: fetchedOrders });
}
答案 1 :(得分:2)
您不能在componentWillMount方法中设置状态。尝试重新考虑您的应用程序逻辑并将其移至另一个生命周期方法。
答案 2 :(得分:0)
我认为根本原因与我昨天回答的原因相同,您需要“取消” unmount
上的请求,我看不出您是否为{{ 1}}组件。
关于错误处理的注释,它看起来过于复杂,我绝对鼓励您查看React提供的ErrorBoundaries。您不需要具有api.get()
或更高阶的元素。
对于ErrorBoundaries,React引入了一种生命周期方法,称为:Orders
。
您可以使用它来将interceptors
代码简化为:
componentDidCatch
然后在您的ErrorHandler
组件中:
class ErrorHandler extends React.Component {
constructor(props) {
super(props);
this.state = { hasError: false };
}
componentDidCatch(error, info) {
this.setState({ hasError: true, errorMessage : error.message });
}
render() {
if (this.state.hasError) {
return <Modal
modalClosed={() => console.log('What do you want user to do? Retry or go back? Use appropriate method logic as per your need.')}>
{this.state.errorMessage ? this.state.errorMessage : null}
</Modal>
}
return this.props.children;
}
}
并在您的代码中将其用作:
Orders