我在一个组件中有这个道具,我想将其传递给另一个组件,并在那里用作变量:
const VerContinentToolbar = (props) => {
return (
<Menu className="nav-icon">
<CountryList displayFields={["countryName"]} />
</Menu>
);
};
如果我使用console.log(props.props),则会得到以下信息:https://imgur.com/a/HnRHDcH这是我想传递给useCountries的值。接收组件如下所示:
const useCountries = (props) => {
const [countries, setCountries] = useState([])
useEffect(() => {
firebase
.firestore()
.collection("Africa")
.onSnapshot((snapshot) => {
const newCountries = snapshot.docs.map((doc) => ({
id: doc.id,
...doc.data()
}))
setCountries(newCountries)
})
}, [])
return countries
}
const CountryList = ({ displayFields = [] }) => {
const countries = useCountries();
console.log(countries)
return (
<div className="countries">
{countries.map(country => (
<div key={country.id}>
<div className="entry">
{displayFields.includes("continent") && (
<div>Name of continent: {country.continent}</div>
)}
{displayFields.includes("revName") && (
<div>{country.revName}</div>
)}
{displayFields.includes("countryName") && (
<div><Link to={"./Jumbotron"}>{country.countryName}</Link></div>
)}
{displayFields.includes("dest1") && (
<div>Destination 1: {country.dest1}</div>
)}
{displayFields.includes("dest2") && (
<div>Destination 2: {country.dest2}</div>
)}
{displayFields.includes("dest3") && (
<div>Destination 3: {country.dest3}</div>
)}
{displayFields.includes("beerPrice") && (
<div>Beer price: {country.beerPrice}</div>
)}
{displayFields.includes("foodPrice") && (
<div>Food price: {country.foodPrice}</div>
)}
{displayFields.includes("hostelPrice") && (
<div>Hostel price: {country.hostelPrice}</div>
)}
{displayFields.includes("review") && <div>Review: {country.review}</div>}
{displayFields.includes("imgUrl") && <img src={country.url} alt="no-img" />}
</div>
</div>
))}
</div>
);
};
我已经尝试并试图理解上下文,但是我无法真正地围绕它。我想将props的值放入“ .collection(“ Africa”)“中,但是我不知道该怎么做。我已经阅读了文档,但是我实在太笨了,无法理解如何正确地进行工作。
[如果还有其他解决方案,我会全力以赴。
我想传递的道具是:我为每个大陆创建了一个组件。在每个组件中,我调用VerContinentToolbar,传递大陆的prop /名称,如下所示:
const Africa = ({}) => {
return (
<div>
<VerContinentToolbar props={["Africa"]} />
This means, that
const VerContinentToolbar = (props) => {
return (
<Menu className="nav-icon">
<CountryList displayFields={["countryName"]} />
</Menu>
);
};
带有单词“非洲”。
我想将“非洲”传递给我的组件,该组件可以获取非洲大陆的集合(在本例中为非洲)。
我想将道具持有的信息传递给此:
const useCountries = (props) => {
const [countries, setCountries] = useState([])
useEffect(() => {
firebase
.firestore()
.collection("Africa") <---- I WANT PROP FROM VERCONT HERE
.onSnapshot((snapshot) => {
const newCountries = snapshot.docs.map((doc) => ({
id: doc.id,
...doc.data()
}))
setCountries(newCountries)
})
}, [])
return countries
}
为了更清楚地说明这一点,我附上了两张图片。亚洲:在这里,我要渲染“亚洲”收藏集,以显示属于亚洲大陆内某个国家的每条评论。
到目前为止,我已经创建了“ Imagination land”,并将其附加到Firebase中的“ Africa”。我只想在非洲部分展示这一点。显然,我想在亚洲部分中显示所有带有亚洲标签的国家。
谢谢
据我所知,您想在CountryList
中调用useCountries
钩子以指定所需的集合。