我们如何在不删除状态字段的情况下进行更新?
async componentDidMount() {
let { get_financial_assessment } = await DAO.getFinancialAssessment()
if( get_financial_assessment ) {
this.setState(get_financial_assessment); <- something with prevState...
} else {
// To-Do: Show the error page.
console.log('You must login to see this page');
}
}
这是状态
state = {
income_source: '',
employment_status: '',
employment_industry: '',
occupation: '',
source_of_wealth: '',
education_level: '',
net_income: '',
estimated_worth: '',
account_turnover: '',
}
如果我们得到get_financial_assessment
as {}
,则状态当前更新为{}
。:(
我们怎样才能防止这种情况发生?
更新样本输入
{
account_turnover: "$25,000 - $50,000",
cfd_score: 0, <- see this is extra field and this is unintentionally added to our state.
education_level: "Secondary",
employment_industry: ...
...
}
After setState
,state
将保留我在中指定的相同字段state
并更新每个相应字段的值。
问题
state
。state
从问题可以有2种情况
1. 所有值为 '' 的对象
要检查所有键为 '' 的对象,您必须将代码更新为以下
if( get_financial_assessment && Object.values(get_financial_assessment).every(v => v !== '')) {
this.setState(get_financial_assessment);
} else {
// To-Do: Show the error page.
console.log('You must login to see this page');
}
2. 空对象(无键)
空对象{}
不会评估为假,因此您必须更新 if 语句以检查空对象,如下所示
if( get_financial_assessment && Object.keys(get_financial_assessment).length) {
this.setState(get_financial_assessment);
} else {
// To-Do: Show the error page.
console.log('You must login to see this page');
}
编辑
您可以事先准备好对象,然后使用setState
函数进行设置。
// original state
let state = {account_turnover: "$25,000 - $50,000",cfd_score: 0};
// Response with updated, missing and additional keys
let data = {cfd_score: 3,education_level: "Secondary",employment_industry: ""};
// Update the current state object and set using setState
Object.entries(state).forEach(([k,v]) => state[k] = data[k] ? data[k] : v);
console.log(state);
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我来说两句