我正在一点一点地将AngularJS应用迁移到React,并且我想拥有一个自定义的RouterLink
React组件,该组件检查react-router
是否在上下文中,以便可以使用{{1} },如果不是,则退回使用旧的history
。但是在window.location
的文档中,我看不到任何检查方法。
我尝试使用react-router
,但是当不在上下文中时会抛出该错误,并且withRouter
似乎无法捕获错误。
有人知道我该怎么做吗?
答案 0 :(得分:1)
react-router
程序包(即__RouterContext
)中公开了路由器上下文,您可以使用该上下文检查路由器是否可用:
import React, { useContext } from 'react';
import { __RouterContext } from 'react-router';
const MyComponent = (props) => {
const router = useContext(__RouterContext);
if (router) {
// Router context is avaible
} else {
// Use window.location as router context is not availble in this component
}
return <SomeOtherComponent />
}
答案 1 :(得分:1)
只需将钩子包裹在try/catch
中即可:
const {useState, useEffect, Fragment} = React;
const {useLocation, MemoryRouter} = ReactRouter;
const Cmp = () => {
let loc;
try {
loc = useLocation();
} catch (err) {
return (
<div>No Router Available</div>
);
}
return (
<div>Hello I can see {loc.pathname}</div>
);
};
const App1 = () => {
return (
<Cmp/>
);
};
const App2 = () => {
return (
<MemoryRouter>
<Cmp/>
</MemoryRouter>
);
};
ReactDOM.render(<App1 />, document.getElementById("app1"));
ReactDOM.render(<App2 />, document.getElementById("app2"));
<script crossorigin src="https://unpkg.com/react@16/umd/react.production.min.js"></script>
<script crossorigin src="https://unpkg.com/react-dom@16/umd/react-dom.production.min.js"></script>
<script src="https://unpkg.com/react-router@5.1.2/umd/react-router.js"></script>
<div id="app1"></div>
<div id="app2"></div>