我有一个像这样的API的json
"data": {
"total_question": 2,
"correct_answer": "1/2",
"correct_percentage": 50,
"details": [
{
"question_id": 1,
"question": "test questioner 1",
"choice": "choice 1.1",
"result": "correct",
"percentage_choice": 100
},
{
"question_id": 2,
"question": "test questioner 2",
"choice": "choise 2.3",
"result": "incorrect",
"percentage_choice": 100
}
]
}
然后我将输入API的响应状态
const [data, setData] = useState({})
这是对数据的获取
const fetchResult = () => {
api.get(`api/questionnaire/getResult?voteId=${id}`)
.then(res => {
const { data: listResult } = res.data
setLoading(false)
setData(listResult)
})
.catch(err => console.log('error'))
}
useEffect(() => {
fetchResult()
}, [])
这是显示响应API的结果
<Card>
<Card.Body>
{Object.keys(data.details).map(item => {
return (
<Col key={item.question_id} xs={12} className='mb-3'>
<h5>{item.question}</h5>
<ProgressBar
variant='danger'
now={item.percentage_choice}
label={`${item.percentage_choice}%`}
/>
</Col>
)
})}
<Col xs={12}>
<h5>Total question: {data.total_question}</h5>
</Col>
</Card.Body>
</Card>
如何获取详细信息并绘制地图?我总是收到以下消息:TypeError:无法将未定义或null转换为对象
您需要先检查要访问的对象/数组是否有效,然后才可以直接map
在数组上进行操作(data.details)...如下所示:
{data.details && data.details.map(item => {
return (
<Col key={item.question_id} xs={12} className='mb-3'>
<h5>{item.question}</h5>
<ProgressBar
variant='danger'
now={item.percentage_choice}
label={`${item.percentage_choice}%`}
/>
</Col>
)
})}
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我来说两句