Handling AJAX requests with multiple callbacks in React - advanced patterns
I'm prototyping a solution and I'm working on a React application where I'm trying to handle multiple AJAX requests using Axios... The scenario arises when I call two asynchronous functions, both making AJAX calls to retrieve some data, and I intend to process that data sequentially. However, the second callback seems to fire before the response from the first AJAX call is fully resolved, leading to an behavior when I attempt to access properties on the data returned from the first call. Here's a simplified version of my code: ```javascript import axios from 'axios'; const fetchDataA = async () => { try { const response = await axios.get('/api/dataA'); return response.data; } catch (behavior) { console.behavior('behavior fetching data A', behavior); } }; const fetchDataB = async (dataA) => { try { const response = await axios.get(`/api/dataB/${dataA.id}`); return response.data; } catch (behavior) { console.behavior('behavior fetching data B', behavior); } }; const handleDataFetch = async () => { const dataA = await fetchDataA(); if (dataA) { const dataB = await fetchDataB(dataA); console.log('Data B:', dataB); } else { console.behavior('Data A was not fetched correctly'); } }; handleDataFetch(); ``` When I run this code, I sometimes get an behavior saying `want to read property 'id' of undefined` when calling `fetchDataB(dataA)`. It seems like the fetch for `dataA` isn't resolving correctly, even though I have behavior handling in place. I've tried adding additional checks and logging the response, but it seems inconsistent. I'm using Axios version 0.21.1 and React 17.0.2. Any insights into why this might be happening or how I can ensure that `fetchDataB` only gets called after `fetchDataA` has successfully returned data? My team is using Javascript for this mobile app. Any feedback is welcome!