我不明白为什么会出现以下错误。 我试图在返回函数中渲染 {links}、{collapse},但它不起作用。 链接和折叠是关于打开子菜单。 感谢您的帮助。
错误消息:
Objects are not valid as a React child (found: object with keys {$$typeof, type, compare, displayName, muiName}). If you meant to render a collection of children, use an array instead.
-- Sidebar.js
/*eslint-disable*/
import React from "react";
import classNames from "classnames";
import PropTypes from "prop-types";
import { NavLink } from "react-router-dom";
// @material-ui/core components
import { makeStyles } from "@material-ui/core/styles";
import {
Drawer,
Hidden,
List,
ListItem,
ListItemText,
Icon,
Collapse
} from "@material-ui/core";
import ExpandLess from "@material-ui/icons/ExpandLess";
import ExpandMore from "@material-ui/icons/ExpandMore";
import ListItemLink from "./ListItemLink";
// core components
import AdminNavbarLinks from "components/Navbars/AdminNavbarLinks.js";
import RTLNavbarLinks from "components/Navbars/RTLNavbarLinks.js";
import styles from "assets/jss/material-dashboard-react/components/sidebarStyle.js";
const useStyles = makeStyles(styles);
export default function Sidebar(props) {
const classes = useStyles();
// verifies if routeName is the one active (in browser input)
function activeRoute(routeName) {
return window.location.href.indexOf(routeName) > -1 ? true : false;
}
const { color, logo, image, logoText, routes } = props;
const [open, setOpen] = React.useState(true);
const handleClick = () => {
setOpen(!open);
};
var links = (
<div>
{routes.map((prop, key) => {
return (
<div>
{prop.submenu.length > 0 ? (
<ListItemLink
to={prop.layout + prop.path}
key={prop.id}
menuText={prop.name}
onClick={handleClick}
subOpen={open}
icon={prop.icon}
/>
) : (
<ListItemLink
to={prop.layout + prop.path}
key={prop.id}
menuText={prop.name}
icon={prop.icon}
/>
)}
</div>
);
})}
</div>
);
var collapse = (
<Collapse in={open} timeout="auto" unmountOnExit>
<List component="div" disablePadding>
{routes.map((prop, key) => {
{
prop.submenu.map((sub, index) => {
return (
<ListItemLink
key={sub.id}
to={sub.path}
menuText={sub.name}
icon={sub.icon}
className={classes.nested}
/>
);
});
}
})}
</List>
</Collapse>
);
var brand = (
<div className={classes.logo}>
<a
className={classNames(classes.logoLink, {
[classes.logoLinkRTL]: props.rtlActive
})}
target="_blank"
>
<div className={classes.logoImage}>
<img src={logo} alt="logo" className={classes.img} />
</div>
{logoText}
</a>
</div>
);
return (
<div>
<Hidden mdUp implementation="css">
<Drawer
variant="temporary"
anchor={props.rtlActive ? "left" : "right"}
open={props.open}
classes={{
paper: classNames(classes.drawerPaper, {
[classes.drawerPaperRTL]: props.rtlActive
})
}}
onClose={props.handleDrawerToggle}
ModalProps={{
keepMounted: true // Better open performance on mobile.
}}
>
{brand}
<div className={classes.sidebarWrapper}>
{props.rtlActive ? <RTLNavbarLinks /> : <AdminNavbarLinks />}
<List component="nav" className={classes.list}>
{links}
{collapse}
</List>
</div>
{image !== undefined ? (
<div
className={classes.background}
style={{ backgroundImage: "url(" + image + ")" }}
/>
) : null}
</Drawer>
</Hidden>
<Hidden smDown implementation="css">
<Drawer
anchor={props.rtlActive ? "right" : "left"}
variant="permanent"
open
classes={{
paper: classNames(classes.drawerPaper, {
[classes.drawerPaperRTL]: props.rtlActive
})
}}
>
{brand}
<div className={classes.sidebarWrapper}>
<List component="nav" className={classes.list}>
{links}
{collapse}
</List>
</div>
{image !== undefined ? (
<div
className={classes.background}
style={{ backgroundImage: "url(" + image + ")" }}
/>
) : null}
</Drawer>
</Hidden>
</div>
);
}
Sidebar.propTypes = {
rtlActive: PropTypes.bool,
handleDrawerToggle: PropTypes.func,
bgColor: PropTypes.oneOf(["purple", "blue", "green", "orange", "red"]),
logo: PropTypes.string,
image: PropTypes.string,
logoText: PropTypes.string,
routes: PropTypes.arrayOf(PropTypes.object),
open: PropTypes.bool
};
-- ListItemLink.js
import React from "react";
import { ListItem, ListItemText, ListItemIcon } from "@material-ui/core";
import ExpandLess from "@material-ui/icons/ExpandLess";
import ExpandMore from "@material-ui/icons/ExpandMore";
import { PropTypes } from "prop-types";
import { Link as RouterLink } from "react-router-dom";
function ListItemLink(props) {
const { to, menuText, icon, subOpen, ...other } = props;
return (
<ListItem button component={RouterLink} to={to} {...other}>
<ListItemIcon>{icon}</ListItemIcon>
<ListItemText primary={menuText} />
{subOpen != null ? subOpen ? <ExpandLess /> : <ExpandMore /> : null}
</ListItem>
);
}
ListItemLink.propTypes = {
subOpen: PropTypes.bool,
to: PropTypes.string.isRequired
};
export default ListItemLink;
最佳答案
在collapse
中,您有两个map
函数。您应该返回第二个 map
函数。
像这样:
const collapse = (
<Collapse in={open} timeout="auto" unmountOnExit>
<List component="div" disablePadding>
{routes.map((prop, key) => {
return prop.submenu.map((sub, index) => {
return (
<ListItemLink
key={sub.id}
to={sub.path}
menuText={sub.name}
icon={sub.icon}
className={classes.nested}
/>
);
});
})}
</List>
</Collapse>
);
关于javascript - “对象作为 React 子对象无效”,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/59817384/