我们可以通过多少种方式将道具传递给反应中的所有子组件
In how many ways we can pass props to all child components in react
我有一个应用代码
import React from "react";
import { Route, Switch } from "react-router-dom";
import Minidrawer from './components/Drawer/Minidrawer'
import { makeStyles } from '@mui/styles';
import Box from '@mui/material/Box';
import Main from "./components/Main/Main";
import {useSelector} from 'react-redux'
const useStyles = makeStyles({
container: {
display: "flex"
}
});
export default function App() {
const classes = useStyles();
const user = useSelector((state) => state.auth);
return (
<Box sx={{ display: 'flex' }}>
<Minidrawer currUser={user}/>
<Switch>
<Route exact from="/" render={props => <Main childText="home" currUser={user} {...props} />} />
<Route exact path="/auth" render={props => <Main childText="auth" currUser={user} {...props} />} />
<Route exact path="/register-client" render={props => <Main childText="registerClient" currUser={user} {...props} />} />
</Switch>
</Box>
);
}
我必须将 currUser 传递给 App 中导入的所有子组件,但我不想重复代码,有哪些不同的方法可以实现这一点,以便所有组件可以访问 currUser?
您可以使用 redux 或上下文 API。
如果我明白你想做什么,你想将 props 传递给一个组件的所有子组件,如果组件是简单的组件你可以这样做:
import React from "react";
import Main from "./Main";
import PassPropsToNormalComponents from "./PassPropsToNormalComponents";
export default function App() {
const user = {
username: "lakhdar"
};
return (
<div style={{ display: "flex" }}>
<PassPropsToNormalComponents currUser={user}>
<Main childText="home" />
<Main childText="auth" />
<Main childText="registerClient" />
</PassPropsToNormalComponents>
</div>
);
这是 PassPropsToNormalComponents 文件
import React from "react";
export default function PassPropsToNormalComponents({ children, ...props }) {
const childrenWithProps = React.Children.map(children, (child) => {
if (React.isValidElement(child)) {
return React.cloneElement(child, { ...child.props, ...props });
}
return child;
});
return <>{childrenWithProps}</>;
}
但在您的情况下,将 props 传递给路由不会让路由将 props 传递给它们的渲染组件,因此我们需要一个额外的步骤:
首先是我们向父级提供道具的文件:
import React from "react";
import { Route, Switch } from "react-router-dom";
import Main from "./Main";
import PassPropsToRouteComponents from "./PassPropsToRouteComponents";
export default function App() {
const user = {
username: "lakhdar"
};
return (
<div style={{ display: "flex" }}>
<Switch>
<PassPropsToRouteComponents currUser={user}>
<Route
exact
from="/"
render={(props) => {
return <Main childText="home" {...props} />;
}}
/>
<Route
exact
path="/auth"
render={(props) => <Main childText="auth" {...props} />}
/>
<Route
exact
path="/register-client"
render={(props) => <Main childText="registerClient" {...props} />}
/>
</PassPropsToRouteComponents>
</Switch>
</div>
);
}
最后,额外的步骤是获取渲染的元素并将其自己的 props + 来自父级的 props 传递给它,文件如下所示:
import React from "react";
export default function PassPropsToRouteComponents({ children, ...props }) {
const childrenWithProps = React.Children.map(children, (child) => {
if (React.isValidElement(child)) {
const routerChild = child.props.render();
return React.cloneElement(child, {
...child.props,
render: () => {
return React.cloneElement(routerChild, {
...routerChild.props,
...props
});
}
});
}
return child;
});
return <>{childrenWithProps}</>;
}
link 到工作代码和框:https://codesandbox.io/s/gracious-meadow-dj53s
希望这就是您一直在寻找的。
我有一个应用代码
import React from "react";
import { Route, Switch } from "react-router-dom";
import Minidrawer from './components/Drawer/Minidrawer'
import { makeStyles } from '@mui/styles';
import Box from '@mui/material/Box';
import Main from "./components/Main/Main";
import {useSelector} from 'react-redux'
const useStyles = makeStyles({
container: {
display: "flex"
}
});
export default function App() {
const classes = useStyles();
const user = useSelector((state) => state.auth);
return (
<Box sx={{ display: 'flex' }}>
<Minidrawer currUser={user}/>
<Switch>
<Route exact from="/" render={props => <Main childText="home" currUser={user} {...props} />} />
<Route exact path="/auth" render={props => <Main childText="auth" currUser={user} {...props} />} />
<Route exact path="/register-client" render={props => <Main childText="registerClient" currUser={user} {...props} />} />
</Switch>
</Box>
);
}
我必须将 currUser 传递给 App 中导入的所有子组件,但我不想重复代码,有哪些不同的方法可以实现这一点,以便所有组件可以访问 currUser?
您可以使用 redux 或上下文 API。
如果我明白你想做什么,你想将 props 传递给一个组件的所有子组件,如果组件是简单的组件你可以这样做:
import React from "react";
import Main from "./Main";
import PassPropsToNormalComponents from "./PassPropsToNormalComponents";
export default function App() {
const user = {
username: "lakhdar"
};
return (
<div style={{ display: "flex" }}>
<PassPropsToNormalComponents currUser={user}>
<Main childText="home" />
<Main childText="auth" />
<Main childText="registerClient" />
</PassPropsToNormalComponents>
</div>
);
这是 PassPropsToNormalComponents 文件
import React from "react";
export default function PassPropsToNormalComponents({ children, ...props }) {
const childrenWithProps = React.Children.map(children, (child) => {
if (React.isValidElement(child)) {
return React.cloneElement(child, { ...child.props, ...props });
}
return child;
});
return <>{childrenWithProps}</>;
}
但在您的情况下,将 props 传递给路由不会让路由将 props 传递给它们的渲染组件,因此我们需要一个额外的步骤:
首先是我们向父级提供道具的文件:
import React from "react";
import { Route, Switch } from "react-router-dom";
import Main from "./Main";
import PassPropsToRouteComponents from "./PassPropsToRouteComponents";
export default function App() {
const user = {
username: "lakhdar"
};
return (
<div style={{ display: "flex" }}>
<Switch>
<PassPropsToRouteComponents currUser={user}>
<Route
exact
from="/"
render={(props) => {
return <Main childText="home" {...props} />;
}}
/>
<Route
exact
path="/auth"
render={(props) => <Main childText="auth" {...props} />}
/>
<Route
exact
path="/register-client"
render={(props) => <Main childText="registerClient" {...props} />}
/>
</PassPropsToRouteComponents>
</Switch>
</div>
);
}
最后,额外的步骤是获取渲染的元素并将其自己的 props + 来自父级的 props 传递给它,文件如下所示:
import React from "react";
export default function PassPropsToRouteComponents({ children, ...props }) {
const childrenWithProps = React.Children.map(children, (child) => {
if (React.isValidElement(child)) {
const routerChild = child.props.render();
return React.cloneElement(child, {
...child.props,
render: () => {
return React.cloneElement(routerChild, {
...routerChild.props,
...props
});
}
});
}
return child;
});
return <>{childrenWithProps}</>;
}
link 到工作代码和框:https://codesandbox.io/s/gracious-meadow-dj53s
希望这就是您一直在寻找的。