[英]Can't set state in react
所以,我只是想在我的反应应用程序中设置状态。 只需从 Axios 获取数据,然后设置状态。 但是无论我做什么,状态都不会设置。 我试过把它放在一个回调中,因为它是异步的,把它放在我的组件上,组件没有更新,唉。 任何指针?
class App extends Component {
componentDidUpdate() {}
constructor(props) {
super(props);
this.state = {
Catogories: [
"Business",
"Entertainment",
"General",
"Health",
"Science",
"Sports",
"Technology"
],
CatPics: [],
TopStories: [],
Selection: [],
Sources: [],
selected: false
};
}
GeneratePic = () => {
this.state.Catogories.forEach(Catogory => {
axios
.get(
"https://api.pexels.com/v1/search?query=" +
Catogory +
"&per_page=15&page=1",
{
Authorization:
"563492ad6f91700001000001d33b5d31a9a145b78ee67e35c8e6c321"
}
)
.then(res => {
var object = { Catogory: res.photos[0].src.large2x };
this.state.CatPics.push(object);
});
});
};
dump = x => {
this.setState({ TopStories: x }, console.log(this.state.TopStories));
};
TopStories = () => {
console.log("working");
axios
.get(
"https://newsapi.org/v2/top-headlines?country=us&apiKey=91bec895cf8d45eaa46124fb19f6ad81"
)
.then(res => {
console.log(res);
const data = res.data.articles;
console.log(data);
this.dump(data);
});
};
你做错了两件事。
GeneratePic = async () => {
const promises = this.state.Catogories.map(Catogory => {
return axios
.get(
"https://api.pexels.com/v1/search?query=" +
Catogory +
"&per_page=15&page=1",
{
Authorization:
"563492ad6f91700001000001d33b5d31a9a145b78ee67e35c8e6c321"
}
)
.then(res => {
return res.photos[0].src.large2x;
});
});
let photos = await Promise.all(promises);
photos = this.state.Catogories.map((cat, index) => ({ [cat]: photos[index] }));
this.setState({ CatPics: photos });
};
getPics = cat => { return axios .get( "https://api.pexels.com/v1/search?query=" + cat + "&per_page=15&page=1", { Authorization: "563492ad6f91700001000001d33b5d31a9a145b78ee67e35c8e6c321" } ) .then(res => { return { [cat]: res.photos[0].src.large2x }; }); } GeneratePic = async () => { const promises = this.state.Catogories.map(Catogory => { this.getPics(Catogory); }); let photos = await Promise.all(promises); this.setState({ CatPics: photos }); };
这应该有效。
不要改变状态。
GeneratePic = () => {
this.state.Catogories.forEach(async Catogory => {
await axios
.get(
"https://api.pexels.com/v1/search?query=" +
Catogory +
"&per_page=15&page=1", {
Authorization: "563492ad6f91700001000001d33b5d31a9a145b78ee67e35c8e6c321"
}
)
.then(res => {
var object = { Catogory: res.data.photos[0].src.large2x };
const cPics = [...this.state.CatPics];
cPics.push(object);
this.setState({
CatPics: cPics
})
});
});
};
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