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Accepted
Николай
Asked:2022-06-13 18:02:46 +0000 UTC2022-06-13 18:02:46 +0000 UTC

反应本机 - JSON。如何通过 API 获取价值而不是列表？

  • 772

React Native (17.0.2) clean, no axiosetc.，试图用fetch.

JSON 示例本身

{
  "response":"success",
  "value":{
    "name":"test",
    "text":"test"
  },
  "list": [
    { "id": "1", "title": "test", "releaseYear": "1977" },
    { "id": "2", "title": "test", "releaseYear": "1977" }
  ]
}

反应原生

import React, { useEffect, useState } from 'react';
import { ActivityIndicator, FlatList, Text, View } from 'react-native';

export default App = () => {
  const [isLoading, setLoading] = useState(true);
  const [data, setData] = useState([]);

  const getMovies = async () => {
     try {
      const response = await fetch('https://you_site.com/test.json');
      const json = await response.json();
      setData(json.movies);
    } catch (error) {
      console.error(error);
    } finally {
      setLoading(false);
    }
  }

  useEffect(() => {
    getMovies();
  }, []);

  return (
    <View style={{ flex: 1, padding: 24 }}>

    {/* Тут нужно отобразить value->name */}

      {isLoading ? <ActivityIndicator/> : (
        <FlatList
          data={data}
          keyExtractor={({ id }, index) => id}
          renderItem={({ item }) => (
            <Text>{item.title}, {item.releaseYear}</Text>
          )}
        />
      )}
    </View>
  );
};

仅显示数组中的列表list，一切正常。

但是我如何在整个列表（即 display ）之前name从对象value的键中推断和显示值？<View style={{ flex: 1, padding: 24 }}>test

json

1 个回答

  1. Best Answer

    决定了！这段代码并不完美——但它解决了问题。

    import React, { useEffect, useState } from 'react';
import { ActivityIndicator, FlatList, Text, View } from 'react-native';

export default App = () => {
  const [isLoading, setLoading] = useState(true);
  const [test, setTest ] = useState([]);

  const getMovies = async () => {
     try {
      const response = await fetch('https://itstav.ru/1.json');
      const json = await response.json();
      setTest (json.value);
    } catch (error) {
      console.error(error);
    } finally {
      setLoading(false);
    }
  }

  useEffect(() => {
    getMovies();
  }, []);

  return (
    <View style={{ flex: 1, padding: 24 }}>
      <Text>{test.name}</Text>
    </View>
  );
};
    • 1

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