[英]React 17.0.1 map is undefined
您好我正在嘗試從 json 數據創建一個動態表,該數據來自 Axios 獲取請求。
const [projectData, setprojectData] = useState({});
const [schedule, setSchedule] = useState({});
useEffect(() => {
Axios.get(`/fetch-project-details/${id}`, {}).then((response) => {
setprojectData(result[0]);
setSchedule(JSON.parse(result[0].p_schedule));
});
return (
<div>
schedule.map((value) => { // How to return the key value pairs as a table format
return (
<tr>{value.id}</tr>
<th>{value.keys}</th>
)
})
)
這是我在計划中得到的 state
[
{
"Sno": "1",
"First Name": "name",
"Last Name": "las2t name",
"Email": "test@gmail.com",
"Amount": "2000"
},
{
"Sno": "1",
"First Name": "first name",
"Last Name": "last name",
"Email": "test2@gmail.com",
"Amount": "2000"
}
]
如何將密鑰作為 thead 和對作為 tbody 返回?
// const [schedule, setSchedule] = useState({});
const [schedule, setSchedule] = useState([]);
return (
<div>
{
schedule.map((value) => {
return (
<tr>{value.id}</tr>
<th>{value.keys}</th>
)
})
}
</div>
)
return is executed before the schedule is set by setSchedule. so you can add a null check in return.
<div>
{schedule && ( schedule.map((value) => {
return (
<tr>{value.id}</tr>
<th>{value.keys}</th>
)
}) )}
or use ? operator like schedule?.map((value)
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