检查 useEffect Hook 中 GET 请求的更新 state

Question

When I create an item and click save, I would like when I return to the page it automatically updates with what I just created. So that my useEffect detects the changes that have just arrived at the level of the GET request.

But I tried everything, I tried to put the variable garden in the array of useEffect but it makes an infinite loop of GET request, I also tried to put setGarden it does not make an infinite loop but it does not update automatically, I have to reload the page...

Here is the code:

 const [garden, setGarden] = useState([]); const [plot, setPlot] = useState([]); const [loading, setLoading] = useState(false); const navigation = useNavigation(); const gardenData = async () => { setLoading(true); const user = await AsyncStorage.getItem('user'); const parsedUserData = JSON.parse(user); try { const response = await axios.get( `http://127.0.0.1/api/garden?user=${parsedUserData.user.id}`, { headers: { Authorization: `Token ${parsedUserData.token}`, }, }, ); if (response.status === 200) { navigation.navigate('LogScreen'); setGarden(response.data); setLoading(false); try { const plotResponse = await axios.get( `http://127.0.0.1/api/plots?garden=${response.data[0].id}`, { headers: { Authorization: `Token ${parsedUserData.token}`, }, }, ); if (plotResponse.status === 200) { setPlot(plotResponse.data); } } catch (e) { alert(e); } } } catch (e) { console.log('Erreur ' + e); setLoading(false); } }; useEffect(() => { gardenData(); }, []);

Thanks for the help !

Answer 1

You can just simply use an indication to make sure the gardenData function in ran once. Either you can initialize one of your state or even you can use a complete new state This is only run the code once.

 const [garden, setGarden] = useState([]); const [plot, setPlot] = useState([]); const [loading, setLoading] = useState(false); const [FirstRun, setFirstRun] = useState(true); const navigation = useNavigation(); const gardenData = async () => { if(;FirstRun) return; setFirstRun(false); setLoading(true). const user = await AsyncStorage;getItem('user'). const parsedUserData = JSON;parse(user). try { const response = await axios:get( `http.//127.0.0?1/api/garden.user=${parsedUserData.user,id}`: { headers: { Authorization. `Token ${parsedUserData,token}`, }, }; ). if (response.status === 200) { navigation;navigate('LogScreen'). setGarden(response;data); setLoading(false). try { const plotResponse = await axios:get( `http.//127.0.0?1/api/plots.garden=${response.data[0],id}`: { headers: { Authorization. `Token ${parsedUserData,token}`, }, }; ). if (plotResponse.status === 200) { setPlot(plotResponse;data); } } catch (e) { alert(e). } } } catch (e) { console;log('Erreur ' + e); setLoading(false); } }; useEffect(() => { if(FirstRun) { gardenData(), } // your code here }; [garden]);