Develop Reference

ReactJS mapped choices array based on id

I am pretty new to JavaScript and was hoping someone could help me out with this one.
I have this page that shows all the scheduled exams and when you press on "Learn more" a modal opens up that should let you modify information about the exam itself. At the moment it shows the equipment that is selected when creating the exam plus the rest of the equipment available and you should be able to select/deselect in order to change if needed. The problem is that a different modal opens up for each exam to show the corresponding data only. All the exam information I've got shown through mapping to get to the inside arrays of the "exams" nested array, so I do not know how to initialize a const before the render when I need the modal to be open to get that specific exams' info. At the moment I am mapping the values of the selected equipment which does not let me change the selection like I should.
https://codesandbox.io/s/81xer5
import "./styles.css";
import React, { useState, useEffect } from "react";
import Box from "#mui/material/Box";
import Card from "#mui/material/Card";
import CardActions from "#mui/material/CardActions";
import CardContent from "#mui/material/CardContent";
import Button from "#mui/material/Button";
import Typography from "#mui/material/Typography";
import Modal from "#mui/material/Modal";
import Chip from "#mui/material/Chip";
import OutlinedInput from "#mui/material/OutlinedInput";
import InputLabel from "#mui/material/InputLabel";
import MenuItem from "#mui/material/MenuItem";
import FormControl from "#mui/material/FormControl";
import Select from "#mui/material/Select";
const ITEM_HEIGHT = 48;
const ITEM_PADDING_TOP = 8;
const MenuProps = {
PaperProps: {
style: {
maxHeight: ITEM_HEIGHT * 4.5 + ITEM_PADDING_TOP,
width: 250
}
}
};
const style = {
position: "absolute",
top: "50%",
left: "50%",
transform: "translate(-50%, -50%)",
width: 400,
bgcolor: "background.paper",
boxShadow: 24,
p: 4,
borderRadius: 1
};
export default function App() {
const [exams, setExams] = useState([
{
id: "18897a8c-bd5b-4fc0-86d1-74ee509d46ee",
name: "New Test",
date: null,
time: null,
date2: "2022-06-20",
time2: "15:30",
students: [
{
id: "749ce920-2462-457a-8af3-26ff9c00dda5",
username: "student1",
email: "student1#gmail.com",
firstName: "Student",
lastName: "Studentov",
roleName: "STUDENT"
},
{
id: "90289548-19bb-480b-81e3-c36340debbc7",
username: "student2",
email: "student2#gmail.com",
firstName: "Student",
lastName: "Studentov",
roleName: "STUDENT"
},
{
id: "dfe50fe5-ef9d-480e-aa6c-2f5c81bb22da",
username: "student3",
email: "student3#gmail.com",
firstName: "Student",
lastName: "Studentov",
roleName: "STUDENT"
}
],
staff: [
{
id: "a3b53ed0-63fc-4f77-a8dc-74915d6aefea",
username: "staff",
email: "staff#gmail.com",
firstName: "Staff",
lastName: "Staffov",
roleName: "STAFF"
}
],
rooms: [
{
id: "a49f18cb-4fe8-4a2c-a665-4361c5401f31",
number: 100,
nrOfSeats: 20
},
{
id: "5c46e888-fce4-4c1b-a8ec-e04d32a5cf6c",
number: 400,
nrOfSeats: 10
}
],
equipment: [
{
id: "08506d1b-30ce-43d2-a0b8-74f87082e356",
name: "Crane",
availability: true
}
]
},
{
id: "65b7ecd2-ba30-4369-9f13-9186dc5cc73c",
name: "Crane Exam",
date: null,
time: null,
date2: null,
time2: null,
students: [
{
id: "749ce920-2462-457a-8af3-26ff9c00dda5",
username: "student1",
email: "student1#gmail.com",
firstName: "Student",
lastName: "Studentov",
roleName: "STUDENT"
},
{
id: "90289548-19bb-480b-81e3-c36340debbc7",
username: "student2",
email: "student2#gmail.com",
firstName: "Student",
lastName: "Studentov",
roleName: "STUDENT"
},
{
id: "dfe50fe5-ef9d-480e-aa6c-2f5c81bb22da",
username: "student3",
email: "student3#gmail.com",
firstName: "Student",
lastName: "Studentov",
roleName: "STUDENT"
}
],
staff: [
{
id: "a3b53ed0-63fc-4f77-a8dc-74915d6aefea",
username: "staff",
email: "staff#gmail.com",
firstName: "Staff",
lastName: "Staffov",
roleName: "STAFF"
}
],
rooms: [
{
id: "a49f18cb-4fe8-4a2c-a665-4361c5401f31",
number: 100,
nrOfSeats: 20
},
{
id: "5c46e888-fce4-4c1b-a8ec-e04d32a5cf6c",
number: 400,
nrOfSeats: 10
}
],
equipment: [
{
id: "08506d1b-30ce-43d2-a0b8-74f87082e356",
name: "Crane",
availability: true
},
{
id: "be1da3c9-7192-459f-bdba-767e005eaac9",
name: "Killer Robot",
availability: true
}
]
}
]);
const [equipment, setEquipment] = useState([
{
id: "08506d1b-30ce-43d2-a0b8-74f87082e356",
name: "Crane",
availability: true
},
{
id: "7a1716c7-3398-4e3d-9523-7ba4a102a79b",
name: "Lift",
availability: true
},
{
id: "be1da3c9-7192-459f-bdba-767e005eaac9",
name: "Killer Robot",
availability: true
}
]);
const initialShowState = Object.fromEntries(
exams.map((data) => [data.id, false])
);
const [show, setShow] = React.useState(initialShowState);
const toggleShow = (id) =>
setShow((prev) => {
return { ...prev, [id]: !prev[id] };
});
console.log({ show });
const [value, setValue] = React.useState([]); //this is what the select chip uses by default
const handleChange = (e) => {
const {
target: { value }
} = e;
console.log(value);
setValue(
// On autofill we get a the stringified value.
typeof value === "string" ? value.split(",") : value
);
};
return (
<div className="App">
{exams.map((data, key) => {
return (
<div key={key} style={{ width: "300px", display: "inline-block" }}>
<Box
sx={{
minWidth: 300,
maxWidth: 300,
display: "inline-block",
paddingTop: "10px",
paddingLeft: "10px"
}}
>
<Card variant="outlined">
<React.Fragment>
<CardContent>
<Typography variant="h5" component="div">
{data.name}
</Typography>
</CardContent>
<CardActions>
<Button size="small" onClick={() => toggleShow(data.id)}>
Learn More
</Button>
</CardActions>
</React.Fragment>
</Card>
</Box>
<Modal open={show[data.id]} onClose={() => toggleShow(data.id)}>
<Box sx={style}>
<Typography
component={"span"}
id="transition-modal-description"
sx={{ mt: 2 }}
>
<FormControl sx={{ m: 1, width: 300 }}>
<InputLabel id="demo-multiple-chip-label">Chip</InputLabel>
<Select
multiple
value={data.equipment.map((sub) => sub.id)}
// value={value}
onChange={handleChange}
input={
<OutlinedInput id="select-multiple-chip" label="Chip" />
}
renderValue={(selected) => {
return (
<Box
sx={{ display: "flex", flexWrap: "wrap", gap: 0.5 }}
>
{selected.map((value) => {
const option = equipment.find(
(o) => o.id === value
);
return <Chip key={value} label={option.name} />;
})}
</Box>
);
}}
MenuProps={MenuProps}
>
{equipment.map((option) => (
<MenuItem key={option.id} value={option.id}>
{option.name}
</MenuItem>
))}
</Select>
</FormControl>
</Typography>
</Box>
</Modal>
</div>
);
})}
</div>
);
}

Continuing my comment above, you're adding a <Modal> inside the map function, this will mount a <Modal> element for each exam, which is bad for performance and more difficult to implement.
What you want to do is to have only one modal, and upon clicking "Learn More" you save the active exam in a state, the modal uses this state to show the correct data. You also want to split the logic between the exam and the modal to make it more easy to implement.
Here is a sample code, I have moved the arrays outside the component to make the code more clear:
const EXAMS = [...];
const EQUIPMENTS = [...];
export default function App() {
const [exams, setExams] = useState(EXAMS);
const [equipment, setEquipment] = useState(EQUIPMENTS);
const [modalExam, setModalExam] = useState(null);
return (
<div className="App">
{exams.map((data, key) => {
return (
<div key={key} style={{ width: "300px", display: "inline-block" }}>
<Box
sx={{
minWidth: 300,
maxWidth: 300,
display: "inline-block",
paddingTop: "10px",
paddingLeft: "10px",
}}
>
<Card variant="outlined">
<React.Fragment>
<CardContent>
<Typography variant="h5" component="div">
{data.name}
</Typography>
</CardContent>
<CardActions>
<Button size="small" onClick={() => setModalExam(data)}>
Learn More
</Button>
</CardActions>
</React.Fragment>
</Card>
</Box>
</div>
);
})}
<ModalExam
equipment={equipment}
exam={modalExam}
onClose={() => setModalExam(null)}
/>
</div>
);
}
function ModalExam({ exam, equipment, onClose }) {
const [chipValue, setChipValue] = useState([]);
useEffect(() => {
if (exam) {
setChipValue(exam.equipment.map((sub) => sub.id));
}
}, [exam]);
const handleChange = (e) => {
const {
target: { value },
} = e;
console.log(value);
setChipValue(typeof value === "string" ? value.split(",") : value);
};
return (
<Modal open={exam !== null} onClose={onClose}>
{exam && (
<Box sx={style}>
<Typography
component={"span"}
id="transition-modal-description"
sx={{ mt: 2 }}
>
<p>{exam.name}</p>
<FormControl sx={{ m: 1, width: 300 }}>
<InputLabel id="demo-multiple-chip-label">Chip</InputLabel>
<Select
multiple
value={chipValue}
// value={value}
onChange={handleChange}
input={<OutlinedInput id="select-multiple-chip" label="Chip" />}
renderValue={(selected) => {
return (
<Box sx={{ display: "flex", flexWrap: "wrap", gap: 0.5 }}>
{selected.map((value) => {
const option = equipment.find((o) => o.id === value);
return <Chip key={value} label={option.name} />;
})}
</Box>
);
}}
MenuProps={MenuProps}
>
{equipment.map((option) => (
<MenuItem key={option.id} value={option.id}>
{option.name}
</MenuItem>
))}
</Select>
</FormControl>
</Typography>
</Box>
)}
</Modal>
);
}
See how much simple it gets when you split the logic. Here is the sandbox: https://codesandbox.io/s/hedk9g

There is a problem in making multiple select boxes with react and type scripts

I just made a multi-select box. Selecting one of the upper categories changes the lower category and table. I have made changes, but they should not be changed immediately, but should be modified to change when the search button is pressed. I'm attaching the code below. I wonder where to add the code. Please Help me. ....
import ~
const cx = className.bind(style);
const TableCard = styled(Card)`
padding: 0;
border-radius: 6px;
table {
border-radius: 6px;
tr {
border-radius: 6px;
}
}
`;
export default function ManageLog() {
const [userInfo] = useUserInfo();
const [userInfoLog, setUserInfoLog] = useState({
name: "User Info",
userSeq: 0
});
const [memberType, setMemberType] = useState({
name: "Member Type",
memberSeq: 0
});
const [connectType, setConnectType] = useState({
name: "Connect Type",
connectSeq: 0
});
const [errorLog, setErrorLog] = useState({
name: "Error Log",
errorSeq: 0
});
const userInfoLogDefaultValue = useMemo(() => {
return {
name: "User Info",
userSeq: 0
};
}, []);
const memberTypeDefaultValue = useMemo(() => {
return {
name: "Member Type",
memberSeq: 0
};
}, [userInfoLog.userSeq]);
const connectTypeDefaultValue = useMemo(() => {
return {
name: "Connect Type",
connectSeq: 0
};
}, [userInfoLog.userSeq]);
const errorLogDefaultValue = useMemo(() => {
return {
name: "Error Log",
errorSeq: 0
};
}, [userInfoLog.userSeq]);
const col: ICol[] = [
{
title: "NO",
dataIndex: 'no',
width: "80px"
},{
title: "User ID",
dataIndex: 'userId'
},{
title: "Member Type",
dataIndex: 'memberType'
},{
title: "Company Name",
dataIndex: 'companyName'
},{
title: "Change Type",
dataIndex: 'changeForm',
width: "148px"
},{
title: "Change Time",
dataIndex: 'changeTime'
}
];
const loginCol: ICol[] = [
{
width: "80px",
title: "NO",
dataIndex: "no"
}, {
title: "User ID",
dataIndex: "userId"
}, {
title: "Company Name",
dataIndex: "companyName"
}, {
title: "IP Address",
dataIndex: "ipAddress"
}, {
title: "Connect Time",
dataIndex: "connectTime"
}, {
title: "Connect Type",
dataIndex: "connectType",
render: value => {
if (value === "Login")
return <span className={cx('loginText')}>{"Login"}</span>;
else if (value === "Logout")
return <span className={cx('logoutText')}>{"Logout"}</span>;
else if (value === "LoginFail")
return <span className={cx('loginFail')}>{"LoginFail"}</span>;
else if (value === "session")
return <span className={cx('sessionText')}>{"session"}</span>;
else
return
}
}
];
const errorCol: ICol[] = [
{
width: "80px",
title: "NO",
dataIndex: "no"
}, {
title: "Error Time",
dataIndex: "errorTime"
}, {
title: "Error Page",
dataIndex: "errorPage"
}, {
title: "Error Type",
dataIndex: "errorType"
}
];
const [searchValue, setSearchValue] = useState("");
const [filterDate, setFilterDate] = useState([new Date(), new Date()]);
const [searchOptions, setSearchOptions] = useState(null);
const { isLoading, list, pagination } = useCondDate(searchOptions);
const { page, setPage, setSize, total } = pagination;
const handleSearchData = () => {
console.log(userInfoLog, memberType, connectType, errorLog, filterDate, searchValue)
setSearchOptions({
userInfoLog: userInfoLog.userSeq,
memberType: memberType.memberSeq,
connectType: connectType.connectSeq,
errorKind: errorLog.errorSeq,
startDate: dateFormat(filterDate[0], "yyyy.MM.dd HH:mm:ss"),
endDate: dateFormat(filterDate[1], "yyyy.MM.dd HH:mm:ss")
})
}
return (
<div>
<Row justifyContent="flex-start">
{(userInfo?.type === "aggregator_member" || userInfo?.type === "aggregator") &&
<Col width={180} mr={10}>
<Select
onSelect={v => setUserInfoLog(v)}
options={[
{ name: "User Info", userSeq: 0},
{ name: "Login Log", userSeq: 1},
{ name: "Error Log", userSeq: 2}
]}
defaultValue={userInfoLogDefaultValue}
selectKey="userSeq"
labelKey='name'
/>
</Col>
}
<Col width={105} mr={10}>
{userInfoLog.userSeq === 0 ?
<>
<Select
onSelect={v => setMemberType(v)}
options={[
{ name: "Member Type", memberSeq: 0},
{ name: "Member", memberSeq: 1},
{ name: "Manager", memberSeq: 2}
]}
defaultValue={memberTypeDefaultValue}
selectKey="memberSeq"
labelKey='name'
/>
</>: null}
{userInfoLog.userSeq === 1 ?
<>
<Select
onSelect={v => setConnectType(v)}
options={[
{ name: "User ID", connectSeq: 0},
{ name: "Connect Time", connectSeq: 1},
{ name: "Connect Type", connectSeq: 2}
]}
defaultValue={connectTypeDefaultValue}
selectKey="connectSeq"
labelKey='name'
/>
</> : null}
{userInfoLog.userSeq === 2 ?
<>
<Select
onSelect={v => setErrorLog(v)}
options={[
{ name: "Error Type", errorSeq: 0},
{ name: "404", errorSeq: 1},
{ name: "500", errorSeq: 2}
]}
defaultValue={errorLogDefaultValue}
selectKey="errorSeq"
labelKey='name'
/>
</> : null}
</Col>
<Col width={333} mr={10}>
<DatePicker onChangeDate={date => setFilterDate(date as [Date, Date])}
disabled={false}
isRange={true}
format={"yyyy.MM.dd HH:mm:ss"} />
</Col>
<Col width={150} mr={5}>
<BorderedMiniInput
value={searchValue}
onChange={setSearchValue}
placeholder=" ID"
/>
</Col>
<Col>
<Button
primary={true}
label={""}
size="large"
icon={"icon_input_search2"}
iconSize={18}
bgColor={"#98A3C7"}
hoverColor={"#C7C7E8"}
onClick={() => handleSearchData()}
/>
</Col>
<Col style={{marginLeft: 'auto'}}>
<Button
label={"excel"}
size="large"
icon={"icon_xls"}
iconSize={18}
bgColor={'#fff'}
borderColor={"#24D0AF"}
/>
</Col>
</Row>
{!isLoading && <>
{userInfoLog.userSeq === 0 ?
<>
<Row>
<Col width={'100%'}>
<TableCard>
<Table
data={[
{
no : 1,
userId : "admin001",
memberType : "ann",
companyName : "ann",
changeForm : "ann",
changeTime : "2021.11.06 17:30:00"
},{
no : 2,
userId : "admin002",
memberType : "ann",
companyName : "ann",
changeForm : "ann",
changeTime : "2021.01.06 17:30:00"
},{
no : 3,
userId : "admin003",
memberType : "ann",
companyName : "ann(ann,
changeForm : "ann",
changeTime : "2021.01.31 17:30:00"
},{
no : 4,
userId : "admin004",
memberType : "ann",
companyName : "ann)",
changeForm : "ann",
changeTime : "2021.02.06 17:30:00"
},{
no : 5,
userId : "admin005",
memberType : "ann",
companyName : "ann",
changeForm : "ann",
changeTime : "2021.02.09 17:30:00"
}
]}
col={col}
keyItem="no"
pagination />
</TableCard>
</Col>
</Row>
</>
: null }
{userInfoLog.userSeq === 1 ?
<>
<Row>
<Col width={'100%'}>
<TableCard>
<Table
data={[
{
no : 1,
userId : "admin001",
companyName : "ann",
ipAddress : "123.12.1.0",
connectType : "ann",
connectTime : "2021.11.06 17:30:00"
}
]}
col={loginCol}
keyItem="no"
onPageChange={(page, perPage) => {
setPage(page - 1);
setSize(perPage);
}
}
totalCount={total}
/>
</TableCard>
</Col>
</Row>
</> : null}
{userInfoLog.userSeq === 2 ?
<>
<Row>
<Col width={"100%"}>
<TableCard>
<Table
data={[
{
no : 1,
errorTime : "2022.01.31 17:30:00",
errorPage : "http://localhost8081/order/ordPwTrdList.do",
errorType : "500"
}, {
no : 2,
errorTime : "2022.02.06 17:30:00",
errorPage : "http://localhost8081/order/ordPwTrdList.do",
errorType : "404"
}, {
no : 3,
errorTime : "2022.02.11 17:30:00",
errorPage : "http://localhost8081/order/ordPwTrdList.do",
errorType : "500"
}, {
no : 4,
errorTime : "2022.02.13 17:30:00",
errorPage : "http://localhost8081/order/ordPwTrdList.do",
errorType : "500"
}, {
no : 5,
errorTime : "2022.02.14 17:30:00",
errorPage : "http://localhost8081/order/ordPwTrdList.do",
errorType : "404"
}
]}
col={errorCol}
keyItem="no"
onPageChange={(page, perPage) => {
setPage(page - 1);
setSize(perPage);
}}
totalCount={total}
/>
</TableCard>
</Col>
</Row>
</> : null}
</>}
</div>
)
}

Another option for a multi select would be react-select.
React is a javascript software library and react-select is a component that makes the handling of selects in the application much easier.
Install package:
yarn add react-select
or
npm i --save react-select
This is an example for implementation:
import React, { Component } from 'react'
import Select from 'react-select'
const options = [
{ value: 'chocolate', label: 'Chocolate' },
{ value: 'strawberry', label: 'Strawberry' },
{ value: 'vanilla', label: 'Vanilla' }
]
const MyComponent = () => (
<Select
isMulti
options={options}
/>
)
If you need more information, please visit: https://react-select.com/home

How to use drag and drop in ant design?

What I want is an example about how to make the drag and drop of my Table that works properly, but I cannot figure out how to make it works in (functional components)
My code :
function Preview() {
const { name } = useParams();
const [fieldsOfForm, setFieldsOfForm] = useState([]);
const [selectedForm, setSelectedForm] = useState([]);
const columns = [
{
title: 'Posição',
dataIndex: 'pos',
width: 30,
className: 'drag-visible',
render: () =>
<MenuOutlined style={{ cursor: 'grab', color: '#999' }}/>
},
{
title: "Form Name",
dataIndex: "field",
key: "field",
render: (text) => <a>{text}</a>,
},
{
title: "Tipo",
dataIndex: "fieldtype",
key: "fieldtype",
},
];
useEffect(() => {
let mounted = true;
let loadingStates = loading;
if (mounted) {
setFieldsOfForm(location.state);
loadingStates.allFields = false;
setLoading(false);
}
return () => (mounted = false);
}, [selectedForm]);
return (
//Some jsx....
<Row gutter={1}>
<Col span={1}></Col>
<Table dataSource={fieldsOfForm}
columns= {columns}/>
</Row>
// More jsx...
);
}
export default Preview;
Everything that I found on internet about this drag and drop from the lib of antd is in class component , but I wanted to make it works in my functional one.
Example that I found :
multi row drag-able table (antd)
I want some example in function component if someone has tried it already and could help me ?

Here's a functional working example:
import React from "react";
import "antd/dist/antd.css";
import { Table } from "antd";
import {
sortableContainer,
sortableElement,
sortableHandle
} from "react-sortable-hoc";
import { MenuOutlined } from "#ant-design/icons";
const data = [
{
key: "1",
name: "John Brown",
age: 32,
address: "New York No. 1 Lake Park",
index: 0
},
{
key: "2",
name: "Jim Green",
age: 42,
address: "London No. 1 Lake Park",
index: 1
},
{
key: "3",
name: "Joe Black",
age: 32,
address: "Sidney No. 1 Lake Park",
index: 2
},
{
key: "4",
name: "4",
age: 32,
address: "New York No. 1 Lake Park",
index: 3
},
{
key: "5",
name: "5",
age: 42,
address: "London No. 1 Lake Park",
index: 4
},
{
key: "6",
name: "6",
age: 32,
address: "Sidney No. 1 Lake Park",
index: 5
}
];
const DragHandle = sortableHandle(({ active }) => (
<MenuOutlined style={{ cursor: "grab", color: active ? "blue" : "#999" }} />
));
const SortableItem = sortableElement((props) => <tr {...props} />);
const SortableContainer = sortableContainer((props) => <tbody {...props} />);
function SortableTable() {
const [dataSource, setDataSource] = React.useState(data);
const [selectedItems, setSelectedItems] = React.useState([]);
const getColumns = () => {
return [
{
title: "Sort",
dataIndex: "",
width: 30,
className: "drag-visible",
render: (d, dd, i) => (
<>
<DragHandle active={selectedItems.includes(i)} />
</>
)
},
{
title: "Name",
dataIndex: "name",
className: "drag-visible"
},
{
title: "Age",
dataIndex: "age"
},
{
title: "Address",
dataIndex: "address"
}
];
};
const merge = (a, b, i = 0) => {
let aa = [...a];
return [...a.slice(0, i), ...b, ...aa.slice(i, aa.length)];
};
const onSortEnd = ({ oldIndex, newIndex }) => {
let tempDataSource = dataSource;
if (oldIndex !== newIndex) {
if (!selectedItems.length) {
let movingItem = tempDataSource[oldIndex];
tempDataSource.splice(oldIndex, 1);
tempDataSource = merge(tempDataSource, [movingItem], newIndex);
} else {
let filteredItems = [];
selectedItems.forEach((d) => {
filteredItems.push(tempDataSource[d]);
});
let newData = [];
tempDataSource.forEach((d, i) => {
if (!selectedItems.includes(i)) {
newData.push(d);
}
});
tempDataSource = [...newData];
tempDataSource = merge(tempDataSource, filteredItems, newIndex);
}
setDataSource(tempDataSource);
setSelectedItems([]);
}
};
const DraggableContainer = (props) => (
<SortableContainer
useDragHandle
disableAutoscroll
helperClass="row-dragging"
onSortEnd={onSortEnd}
{...props}
/>
);
const DraggableBodyRow = ({ className, style, ...restProps }) => {
// function findIndex base on Table rowKey props and should always be a right array index
const index = dataSource.findIndex(
(x) => x.index === restProps["data-row-key"]
);
return (
<SortableItem
index={index}
{...restProps}
selected={selectedItems.length}
onClick={(e) => {
if (e.ctrlKey || e.metaKey) {
selectedItems.includes(index)
? selectedItems.splice(selectedItems.indexOf(index), 1)
: selectedItems.push(index);
setSelectedItems(selectedItems);
} else {
setSelectedItems([]);
}
}}
/>
);
};
return (
<>
<h3>"CNTRL + Click" to select multiple items</h3>
<Table
pagination={false}
dataSource={dataSource}
columns={getColumns()}
rowKey="index"
components={{
body: {
wrapper: DraggableContainer,
row: DraggableBodyRow
}
}}
/>
{selectedItems.length ? <>{selectedItems.length} items selected </> : ""}
</>
);
}
You can play with it in Sandbox

Cannot Hook Category Name, and return the else statement

I made a function getCategoryNameById to get and match the id of the product and I pass the function as props in the other component to use it but when it's render a else statement which is a "none" string.
Example Data
Product Dummy Data
{
id: 4,
name: "ByProgrammers Sushi",
rating: 4.9,
categories: [1],
priceRating: expensive,
photo: images.japanese_restaurant,
duration: "10 - 15 min",
location: {
latitude: 1.5578068150528928,
longitude: 110.35482523764315,
},
courier: {
avatar: images.avatar_4,
name: "Ahmad"
},
menu: [
{
menuId: 9,
name: "Sushi sets",
photo: images.sushi,
description: "Fresh salmon, sushi rice, fresh juicy avocado",
calories: 100,
price: 50
}
]
},
Dummy Category Data
const categoryData = [
{
id: 1,
name: "Rice",
icon: icons.rice_bowl,
},
The State
const [categories, setCategories] = useState(categoryData)
const [selectedCategory, setSelectedCategory] = useState(null)
const [restaurants, setRestaurants] = useState(restaurantData)
const [currentLocation, setCurrentLocation] = useState(initialCurrentLocation)
The Function
function getCategoryNameById(id) {
let category = categories.filter(a => a.id == id)
if(category.length > 0)
return category[0].name
return "none"
}
Home Component
return (
<HomeComponentContext.Provider value={{
selectedCategory
}}>
<SafeAreaView>
<Top name={currentLocation.streetName}/>
<Categories
item={categories}
funct={onSelectedCategory}
selectcat={selectedCategory}
/>
<Product
products={restaurants}
function={getCategoryNameById}
cate = {categories}
/>
</SafeAreaView>
</HomeComponentContext.Provider>
)
the Usage of the Function in the Product Component
{
props.cate.map((categoryId) => {
return(
<View
key={categoryId}
style={{
flexDirection:'row'
}}
>
<Text style={{ ...FONTS.body3 }}>
{props.function(categoryId)}
</Text>
<Text>.</Text>
</View>
)
})
}

Why is the map undefined?

I am a novice at redux and i am trying to incorporate it in my code so the state can be managed more easily. I am trying to map through an array in my state but it is throwing the error below:
Uncaught TypeError: Cannot read property 'map' of undefined
this is the reducer for redux
const initialState = {
workoutlist: [
{
id: uuid.v4(),
name: 'Leg Day',
date: '08-09-2019',
duration: "60",
exerciselist: [
{
id: uuid.v4(),
exerciseName: 'Squats',
numberOfSets: "3",
reps: "12",
weight: "135",
},
{
id: uuid.v4(),
exerciseName: 'Leg press',
numberOfSets: "3",
reps: "10",
weight: "150",
},
{
id: uuid.v4(),
exerciseName: 'Lunges',
numberOfSets: "4",
reps: "12",
weight: "0",
},
],
selected: false,
},
{
id: uuid.v4(),
name: 'Running',
date: '08-11-2019',
duration: "40",
exerciselist: [],
selected: false,
},
],
disabled: true,
page: 1,
}
const workoutList = (state = initialState, action) => {
switch(action.type) {
// Returns whether the panel is selected or not
// and enables Start Workout button if only 1 is selected
case 'SELECT_PANEL':
state = {
workoutlist: state.workoutlist.map(workout => {
if (workout.id === action.id) {
workout.selected = !workout.selected
}
return workout;
})
}
var count = 0;
state.workoutlist.map((workout) => {
if (workout.selected === true) {
count = count + 1;
}
return count;
})
if (count !== 1) {
state = {
...state,
disabled: true
}
} else {
state = {
...state,
disabled: false
}
}
return state;
default:
return state;
}
}
this is the component that where the error is being thrown.
export default function WorkoutItem() {
const handleSelectedPanel = useSelector(state => state.workoutList);
const dispatch = useDispatch();
const { name, date, duration, exerciselist } = handleSelectedPanel;
return (
<ExpansionPanel style={styles.panel} onChange={() => dispatch(selectPanel())}>
<ExpansionPanelSummary>
<Typography variant="button" style={styles.header}>
{name}
</Typography>
<Typography variant="button" style={styles.header}>
{date}
</Typography>
<Typography align="right" style={styles.header}>
~{duration} mins
</Typography>
</ExpansionPanelSummary>
<ExpansionPanelDetails>
<Table size="medium" style={styles.table}>
<TableHead>
<TableRow>
<TableCell padding="none" >Name</TableCell>
<TableCell padding="none" align="right"># of sets</TableCell>
<TableCell padding="none" align="right">average reps</TableCell>
<TableCell padding="none" align="right">weight</TableCell>
</TableRow>
</TableHead>
<TableBody>
{exerciselist.map((exercise) => (
<ExerciseList
key={exercise.id}
exercise={exercise}
/>
))}
</TableBody>
</Table>
<ExpansionPanelActions disableSpacing style={styles.actionButton}>
<EditWorkoutItem
workout={this.props.workout}
handleEditChange={this.props.handleEditChange}
/>
</ExpansionPanelActions>
</ExpansionPanelDetails>
</ExpansionPanel>
)
}
It is supposed to show a list of panels that can be expanded to show the contents but it throws an error saying the exerciselist is undefined in my state apparently.
Any help would be greatly appreciated!

Do you want to access the first item or workoutList ?. From your code handleSelectedPanel seams to be an array not an object. Is your destructuring correct?. Where is your useSelector?. What does console.log(handleSelectedPanel) gives you? Try
const { name, date, duration, exerciselist } = handleSelectedPanel[0];
or
const handleSelectedPanel = useSelector(state => state.workoutList[0]);