We Keep Coding

Getting Error an error message for Collapse component on Material UI

I am trying to build a hamburger menu using Material UI List on Next.js similar to Nested List example on Material UI docs. However, I am keep getting error if I use "collapse" on my code. If I remove collapse then the other parts of the code works fine.
Can anyone tell me what am I doing wrong?
screenshot of an error message
I am trying to build similar to this
import * as React from "react";
import { useState } from "react";
import IconButton from "#mui/material/IconButton";
import ListSubheader from "#mui/material/ListSubheader";
import { Drawer } from "#mui/material";
import List from "#mui/material/List";
import ListItem from "#mui/material/ListItem";
import ListItemButton from "#mui/material/ListItemButton";
import ListItemIcon from "#mui/material/ListItemIcon";
import ListItemText from "#mui/material/ListItemText";
import MenuIcon from "#mui/icons-material/Menu";
import { ExpandLess, ExpandMore } from "#mui/icons-material";
import Collapse from "#mui/material";
const myMenu = [
{
title: "about",
},
{
title: "services",
submenu: [{ title: "Digital Marketing" }, { title: "Promotion" }],
},
{
title: "blog",
},
{
title: "contact",
},
];
const ResponsiveAppBar = () => {
const [openDrawer, setOpenDrawer] = useState(false);
const [open, setOpen] = React.useState(false);
const handleClick = () => {
setOpen(!open);
};
return (
<React.Fragment>
<Drawer
anchor="right"
open={openDrawer}
onClose={() => setOpenDrawer(false)}
>
<List
sx={{ width: "100%", maxWidth: 360, bgcolor: "background.paper" }}
component="nav"
aria-labelledby="nested-list-subheader"
subheader={
<ListSubheader component="div" id="nested-list-subheader">
Navigation
</ListSubheader>
}
>
{myMenu.map((page, index) =>
page.submenu ? (
<div>
<ListItemButton key={index} onClick={handleClick}>
<ListItemText>{page.title}</ListItemText>
{open ? <ExpandLess /> : <ExpandMore />}
</ListItemButton>
<Collapse in={open} timeout="auto" unmountOnExit>
<List component="div" disablePadding>
{page.submenu.map((sub, index) => {
return (
<ListItemButton key={index}>
<ListItem key={index}>
<ListItemText>{sub.title}</ListItemText>
</ListItem>
</ListItemButton>
);
})}
</List>
</Collapse>
</div>
) : (
<ListItemButton key={index}>
<ListItemIcon>
<ListItemText>{page.title}</ListItemText>
</ListItemIcon>
</ListItemButton>
)
)}
</List>
</Drawer>
<IconButton
sx={{ color: "black", marginLeft: "auto" }}
onClick={() => setOpenDrawer(!openDrawer)}
>
<MenuIcon color="white" />
</IconButton>
</React.Fragment>
);
};
export default ResponsiveAppBar;

The culprit is an incorrect import of Collapse:
import Collapse from "#mui/material";
Since Collapse is a named import, you must import it in one of these two ways:
import { Collapse } from "#mui/material";
// Alternatively
import Collapse from "#mui/material/Collapse";

How do I get the className of a event.target in React?

I am trying to get the user.id of the user that I clicked on, so that I can use it as a query parameter in a fetch(). However, what setClickedUserId is passing/assigning to my clickedUserId state is the following: MuiButtonBase-root%20MuiListItem-root%201%20MuiListItem-gutters%20MuiListItem-button
----My code:
import React from 'react';
import {makeStyles} from '#material-ui/core/styles';
import List from '#material-ui/core/List';
import ListItem from '#material-ui/core/ListItem';
import ListItemIcon from '#material-ui/core/ListItemIcon';
import ListItemText from '#material-ui/core/ListItemText';
import Collapse from '#material-ui/core/Collapse';
import ExpandLess from '#material-ui/icons/ExpandLess';
import ExpandMore from '#material-ui/icons/ExpandMore';
import PersonIcon from '#material-ui/icons/Person';
import AddBoxOutlinedIcon from '#material-ui/icons/AddBoxOutlined';
// Global context
import globalContext from './globalContext';
const useStyles = makeStyles((theme) => ({
root: {
marginTop: theme.spacing(-2.0),
width: '100%',
maxWidth: 360,
backgroundColor: '#3F0E40',
color: 'white',
},
nested: {
marginLeft: theme.spacing(-3.5),
},
nestedAdd: {
marginLeft: theme.spacing(3.5),
},
nestedAddText: {
marginLeft: theme.spacing(0.5),
},
}));
/**
*#return{any} nestedList
*/
export default function DmsList() {
const classes = useStyles();
const [open, setOpen] = React.useState(true);
console.log('I am inside DmsList!!');
// Global Context
const {setMobileOpen} = React.useContext(globalContext);
const {currentDmdWith} = React.useContext(globalContext);
const {setChannel} = React.useContext(globalContext);
const {clickedDms, setClickedDms} = React.useContext(globalContext);
const {setClickedUserId} = React.useContext(globalContext);
const handleClickUser = (event) => {
setMobileOpen(false);
setClickedDms('true');
setChannel(event.target.innerText);
setClickedUserId(event.target.className);
console.log(clickedDms);
};
const handleClickAdd = () => {
setMobileOpen(false);
};
const handleClick = () => {
setOpen(!open);
};
return (
<List
component="nav"
aria-labelledby="nested-list-subheader"
className={classes.root}
>
<ListItem button
onClick={handleClick}>
{open ? <ExpandLess /> : <ExpandMore />}
<ListItemText primary="Direct Messages" />
</ListItem>
<Collapse in={open} timeout="auto" unmountOnExit>
<List component="div" disablePadding className={classes.nested}>
{currentDmdWith.map((user) => (
<ListItem button className={user.id} onClick={handleClickUser}>
<ListItemIcon className={user.id}>
</ListItemIcon>
<PersonIcon className={user.id} color='white'/>
<ListItemText className={user.id} primary={user.name} />
</ListItem>
))}
<ListItem button
onClick={handleClickAdd}
className={classes.nested}>
<ListItemIcon>
</ListItemIcon>
<AddBoxOutlinedIcon className={classes.nestedAdd}/>
<ListItemText
className={classes.nestedAddText} primary="Add Teammate" />
</ListItem>
</List>
</Collapse>
</List>
);
}
I would use event.target.id, because it actually gets the div's id and not a bunch of mumbo jumbo, but when I do put id = {user.id} in a ListItem I have to click on a very specific spot, the leftmost side, because if I click on an a person icon or the area with text, event.target.id is a assigned a blank and makes my fetch() return a 404 error.

Instead of trying to read the information out of the Event object, pass the info that you need in the handleClickUser function through the onClick prop.
<ListItem
button
className={user.id}
onClick={() => handleClickUser(user.id)}
>
const handleClickUser = (userId) => {
setClickedUserId(userId);
};

How can i create a multiple nested list

so i am trying to create a list, whereby a list is displaying many items, and two of the items are expandable, and expanding them shows more items(subitems). I have managed to display the list, and the sub-lists, however, clicking either one of the expandable items, expands both items and not just the single one i clicked.
So firstly, i have seperated the listItems as a data structure where i can retrieve them. This is the list Items:
// Skills list in the About Page
export const listItems = [
{
listText: 'Html',
listIcon: <SendIcon/>
},
{
listText: 'CSS',
listIcon: <DraftsIcon />
},
{
listText: 'JavaScript',
listIcon: <InboxIcon />
},
{
listText: 'React',
listIcon: <SendIcon/>,
expan: true,
// SubItems
firstText:'React-Router',
secondText:'React-Navigation',
thirdText:'React-Native',
},
{
listText: 'Database',
listIcon: <DraftsIcon />,
expan: true,
// SubItems
firstText:'FireBase',
secondText:'SQL',
},
{
listText: 'ReactJs',
listIcon: <DraftsIcon />
},
{
listText: 'ReactJs',
listIcon: <DraftsIcon />
}]
This is the code where i am trying to implement the list:
import React, { Fragment } from 'react'
import Styles from './Styles'
// ListItems
import List from '#material-ui/core/List';
import ListItem from '#material-ui/core/ListItem';
import ListItemIcon from '#material-ui/core/ListItemIcon';
import ListItemText from '#material-ui/core/ListItemText';
import ExpandLess from '#material-ui/icons/ExpandLess';
import ExpandMore from '#material-ui/icons/ExpandMore';
import StarBorder from '#material-ui/icons/StarBorder';
import Collapse from '#material-ui/core/Collapse';
import {listItems} from './ListItems'
const AboutSkills = () => {
const classes = Styles()
const [open, setOpen] = React.useState(false);
const handleClick = () => {
setOpen(!open);
};
const outputList = () => (
<>
<List
style={{color:'white'}}
component="nav"
className={classes.root}
>
{ //Map through the ListItems and...
listItems.map((item, index) => {
// if expandable items exist, expand them
if(item.expan)
{
{/* Use fragment instad of <></> because key attribute is required */}
return <Fragment key={index}>
<ListItem button onClick={handleClick} className={classes.aboutList}>
<ListItemIcon className={classes.aboutIcon}>
{item.listIcon}
</ListItemIcon>
<ListItemText primary={item.listText} />
{open ? <ExpandLess /> : <ExpandMore />}
</ListItem>
<Collapse in={open} timeout="auto" unmountOnExit>
<List component="div" disablePadding>
<ListItem button className={classes.nested}>
<ListItemIcon>
<StarBorder />
</ListItemIcon>
<ListItemText classes={{primary:classes.expanText}}
primary={item.firstText} />
</ListItem>
{/* {console.log(item.secondText)} */}
{ item.secondText //if seconditem exists...
? <ListItem button className={classes.nested}>
<ListItemIcon>
<StarBorder />
</ListItemIcon>
<ListItemText classes=
{{primary:classes.expanText}} primary={item.secondText} />
</ListItem>
: console.log('No Third Item')}
{ item.thirdText //if seconditem exists...
? <ListItem button className={classes.nested}>
<ListItemIcon>
<StarBorder />
</ListItemIcon>
<ListItemText classes=
{{primary:classes.expanText}} primary={item.thirdText} />
</ListItem>
: console.log('No Third Item')}
</List>
</Collapse>
</Fragment>
} else {
return <ListItem button className={classes.aboutList} key={index}>
<ListItemIcon className={classes.aboutIcon}>
{item.listIcon}
</ListItemIcon>
<ListItemText classes={{primary:classes.unExpanText}} primary=
{item.listText} />
</ListItem>
}
})}
</List>
</>
)
return (
outputList()
)
}
export default AboutSkills

My answer in this thread is pretty much what you are searching for.
Just adapt the code according to your situation.

'Objects are not valid as a React child'

I don't understand why the following error appears.
I'm trying to render {links}, {collapse} in a return function, but it doesn't work.
links and collapse is about opening sub menus.
Thank you for your help.
The error message:
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;

in collapse, you have two map functions. you should return the second map function.
something like this:
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>
);

I solved my question as followed:
I guess I returned the wrong object...
<List
{...rest}
className={clsx(classes.root, className)}
>
{pages.map(page => (
<React.Fragment key={page.title}>
<ListItem
className={classes.item}
disableGutters
key={page.title}
onClick={page.submenu.length > 0 ? handleClick : null}
open={page.submenu.length > 0 ? open : null}
>
<Button
activeClassName={classes.active}
className={classes.button}
component={CustomRouterLink}
to={page.href}
>
<div className={classes.icon}>{page.icon}</div>
{page.title}
{page.submenu.length > 0 ? (
open ? (
<ExpandLess />
) : (
<ExpandMore />
)
) : null}
</Button>
</ListItem>
<Collapse in={open} timeout={100} unmountOnExit>
<List component="div" disablePadding>
{page.submenu.map((sub, index) => {
return (
<React.Fragment key={sub.title}>
<ListItem
className={classes.nested}
disableGutters
key={sub.title}
>
<Button
activeClassName={classes.active}
className={classes.button}
component={CustomRouterLink}
to={sub.href}
>
<div className={classes.icon}>{sub.icon}</div>
{sub.title}
</Button>
</ListItem>
</React.Fragment>
);
})}
</List>
</Collapse>
</React.Fragment>
))}
</List>

React: Material-UI - how to style the two item list so items will be next to each other?

I've got a list that consists of two items: 'label' and 'value', this is how it currently looks like:
How I can move items that are on the right side to the left, so they would stay next to the label?
This is my code sample:
<List>
{details.map((item, index) =>
<ListItem key={index} divider alignItems="flex-start">
<ListItemIcon>
<i className={item.icon}/>
</ListItemIcon>
<ListItemText className="br-break" primary={item.label} />
<ListItemSecondaryAction>
<ListItemText className="br-break" primary={item.data}/>
</ListItemSecondaryAction>
</ListItem>
)}
</List>
I've tried to remove <ListItemSecondaryAction> tag - didn't work.

One option is to use material-ui styling to override ListItemText flex value:
import React from 'react';
import { makeStyles } from '#material-ui/core/styles';
import List from '#material-ui/core/List';
import ListItem from '#material-ui/core/ListItem';
import ListItemIcon from '#material-ui/core/ListItemIcon';
import ListItemText from '#material-ui/core/ListItemText';
const useStyles = makeStyles(theme => ({
root: {
flex: '0.2',
minWidth: '100px'
},
}));
export default function ListDemo() {
const classes = useStyles();
const details = [
{
label: 'Issue Number',
data: 'CCM-1007'
},
{
label: 'Environment',
data: 'TST'
},
{
label: 'Country',
data: 'SE'
},
]
return (
<List>
{details.map((item, index) =>
<ListItem key={index} divider alignItems="flex-start">
<ListItemIcon>
<i className={item.icon} />
</ListItemIcon>
<ListItemText className={classes.root} primary={item.label} />
<ListItemText className={classes.root} primary={item.data} />
</ListItem>
)}
</List>
);
}

Another solution without makeStyles.
import React from "react";
import List from "#material-ui/core/List";
import ListItem from "#material-ui/core/ListItem";
import ListItemIcon from "#material-ui/core/ListItemIcon";
import ListItemText from "#material-ui/core/ListItemText";
export default function ListDemo() {
const details = [
{
label: "Issue Number",
data: "CCM-1007"
},
{
label: "Environment",
data: "TST"
},
{
label: "Country",
data: "SE"
}
];
return (
<List>
{details.map((item, index) => (
<ListItem key={index} divider alignItems="flex-start">
<ListItemIcon>
<i className={item.icon} />
</ListItemIcon>
<ListItemText
primary={item.label}
primaryTypographyProps={{
display: "inline"
}}
secondary={item.data}
secondaryTypographyProps={{
display: "inline"
}}
/>
</ListItem>
))}
</List>
);
}