如何在select mui中显示从api获取的数据

Question

我正在尝试显示从选择菜单中的Api获取的数据。但似乎存在一个问题。我正在获取数据，但它没有显示在选择菜单中。它只是显示为空。但我可以在控制台中获取映射的数据。它只是没有显示在选择组件中。帮我弄清楚。提前感谢：(

这是我的代码

export function TransferRBTCard(props) {
const [TransferData, setTransferData] = useState([])
const [ContactValue, setContactValue] = useState('')
const handleChange = (event) => {
setContactValue(event.target.value);
};
const TokenData = () => {
axios.get('http://localhost:8006/api/v2/get/list').then(function (res) {
try {
var result = res.data.data;
console.log(result)
setTransferData(result)
}
catch (error) {
console.log(error)
}
})
}
useEffect(() => {
TokenData()
}, [])]
const handleSubmit = (evnt,) => {
evnt.preventDefault();
axios.post('http://localhost:8006/api/v2/add/transfer')
.then(response => {
if (response.data.success === true) {
alert(response.data.message)
}
})
.catch(error => {
console.log(error.message)
});
}
return (
<Card {...props}>
<CardContent>
<Stack direction="row" alignItems="center" gap={1}>
<ShareOutlinedIcon sx={{ color: "text.secondary" }} />
<Typography sx={{ fontSize: 16, fontWeight: 'bold' }} color="text.secondary" gutterBottom>
Transfer RBT
</Typography>
</Stack>
<Grid>
<FormControl size="small" fullWidth >
<Stack flexDirection='column' gap={1.5} mt={1}>
<InputLabel id="Contact Select" sx={{ mt: 1 }}>Select Contact</InputLabel>
<Select
labelId="Contact Select"
id="demo-simple-select"
value={ContactValue}
label='Select Contact'
onChange={handleChange}
>
{TransferData.map((data) => {
<MenuItem key={data.id} value={data.id}>{data.name}</MenuItem>
})}
</Select>
<TextField
id="filled-hidden-label-small"
label="Receiver" variant="outlined" size="small"
onChange={handleChange}
value={TransferData}
name="Receiver"
inputProps={
{ readOnly: true, }}
className="form-control"
/>
<TextField
id="filled-hidden-label-small" type='number'
label="Amount" variant="outlined" size="small"
onChange={handleChange}
name="Amount"
className="form-control"
/>
<TextField
id="filled-hidden-label-small"
label="Comments" variant="outlined"
multiline
rows={2}
onChange={handleChange}
name="Comments"
className="form-control"
/>
<Button
variant="contained"
type="submit"
onClick={handleSubmit}
sx={{ alignSelf: 'center', backgroundColor: '#000073' }} >Submit</Button>
</Stack>
</FormControl>
</Grid>
</CardContent>
</Card>
);
}

Answer 1

您没有从map函数返回(更正确地说，您通过不声明返回来返回undefined(。

更改此项：

{TransferData.map((data) => {
<MenuItem key={data.id} value={data.id}>{data.name}</MenuItem>
})}

到此：

{TransferData.map((data) => (
<MenuItem key={data.id} value={data.id}>{data.name}</MenuItem>
))}

注意，它与写入相同：

{TransferData.map((data) => {
return <MenuItem key={data.id} value={data.id}>{data.name}</MenuItem>
})}