[英]Prop not being passed to Child
真奇怪 我的console.log产生了一家公司:
但出于某种原因,当我尝试从道具中拉出它时,它为空
CompanyDetailContainer
class CompanyDetailContainer extends Component {
async componentDidMount() {
const { fetchCompany } = this.props,
{ companyId } = this.props.match.params;
await fetchCompany(companyId);
}
render(){
const { company } = this.props;
console.log(company) // this outputs a company
return (
<CompanyDetail className="ft-company-detail" company={company} />
);
}
}
const mapStateToProps = state => ({
company: state.company.company
});
const mapDispatchToProps = {
fetchCompany: fetchCompany
};
export default connect(mapStateToProps, mapDispatchToProps)(CompanyDetailContainer);
公司详情
export default class CompanyDetail extends Component {
render(){
const callToAction = 'test';
const { company } = this.props;
console.log(company) // this is null! why??? I've never had this problem before
const title = `${company.name} Details`;
return (
<Main>
<MainLayout title={title}>
<div>
<div id='ft-company-detail'>
<div className="panel vertical-space">
<CompanyHeader className="ft-company-header" company={company} />
<div className="ft-call-to-action-interview">{callToAction}</div>
<CompanyProfile className="ft-company-profile" company={company} />
<RelatedLinks className="ft-company-resources" company={company} />
</div>
</div>
</div>
</MainLayout>
</Main>
);
}
}
/////更新////
这工作:
return (
company && <CompanyDetail className="ft-company-detail" company={company} />
);
但是,为什么这个组合可以正常工作呢? 它的设置几乎相同。 这是我应用上的第一个路线点击,呈现了以下容器:
主页容器
class HomePageContainer extends Component {
async componentDidMount() {
await this.props.fetchFeaturedCompanies();
await this.props.fetchCompanies();
await this.props.fetchCountries();
}
render(){
return (<HomePage
className='ft-homepage'
companies={this.props.companies}
countries={this.props.countries}
featuredCompanies={this.props.featuredCompanies}
/>);
}
}
const mapStateToProps = state => ({
countries: state.country.countries,
companies: state.company.companies,
featuredCompanies: state.company.featuredCompanies
});
const mapDispatchToProps = {
fetchCountries: fetchCountries,
fetchCompanies: fetchCompanies,
fetchFeaturedCompanies: fetchFeaturedCompanies
};
export default connect(mapStateToProps, mapDispatchToProps)(HomePageContainer);
主页
export default class HomePage extends Component {
render(){
return (
<Main>
<MainLayout title='Test'>
<div className="homepage panel vertical-space margin-bottom-300">
<FeaturedCompanies companies={this.props.featuredCompanies} />
<div>
<div className="column-group">
<div className="all-100 width-100 align-center fw-300 extralarge">
test
</div>
</div>
</div>
<CompanyList className="ft-company-list" companies={this.props.companies} countries={this.props.countries} />
</div>
</MainLayout>
</Main>
);
}
}
对于对我的主题发表评论的家伙,上面的第一张图片来自Chrome工具深色主题。 这是我在WebStorm中的实际主题,我认为它更好一些:P:
componentDidMount
在render
之后被调用,并且您的async call
在componentDidMount
,因此对于第一个渲染,父对象和子对象都将为null
,并且由于您在child中使用company.name
而不进行条件检查,因此会出错。 在孩子中提供条件检查,它将正常工作
const { company } = this.props;
console.log(company)
const title = company ? `${company.name} Details`: null;
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