Receive axios responses in the exact order as the requests for efficient search functionality

Question

Receive axios responses in the exact order as the requests for efficient search functionality

Currently, I am working on integrating a search feature in React Native using axios.

For the search functionality, I am incorporating debounce from lodash to control the number of requests being sent.

However, there is a concern about receiving responses out of order and potentially displaying incorrect search results.

For instance, if a user enters 'Home deco' in the search input field, two requests will be generated - one for 'Home' and the next for 'Home deco' as the search query text.

If the request for 'Home' takes longer to return than the request for 'Home deco', the results displayed would be for 'Home' instead of 'Home deco'.

The ideal scenario would be to display both sets of results sequentially, but if 'Home' response comes after 'Home deco' response, it should be ignored.

Below is an example snippet of code:

function Search (){
    const [results, setResults] = useState([]);
    const [searchText, setSearchText] = useState('');

    useEffect(() => {
            getSearchResultsDebounce(searchText);
    }, [searchText]);

    const getSearchResultsDebounce = useCallback(
        _.debounce(searchText => {
            getSearchResults(searchText)
        }, 1000),
        []
    );

    function getSearchResults(searchText) {

        const urlWithParams = getUrlWithParams(url, searchText);
        axios.get(urlWithParams, { headers: config.headers })
             .then(response => {
              if (response.status === 200 && response.data) 
              {
                setResults(response.data);

              } else{
                  //Handle error
              }
            })
            .catch(error => {
                //Handle error
            });
    }

    return (
     <View>
        <SearchComponent onTextChange={setSearchText}/>
        <SearchResults results={results}/>
     </View>
    )

}

What could be the most effective way to address the aforementioned issue?

javascript ajax react-native axios

Answer 1

Answer №1

~~If you're aiming to steer clear of external libraries in order to minimize package size, such as axios-hooks, utilizing the CancelToken feature within axios would be your best bet.~~

Implementing the CancelToken feature correctly will not only prevent any warnings from react regarding failing to cancel asynchronous tasks but also provides a useful tool for managing requests effectively.

A detailed explanation of how to implement and utilize the CancelToken feature can be found on Axios's documentation page here. I recommend giving it a read to grasp its functionality and benefits better.

~~This is how you could integrate the CancelToken feature into the example scenario provided:~~

The poster clarified in subsequent responses that they do not intend to incorporate a cancellation feature. In this case, employing a timestamp system might be more appropriate, as illustrated below:

function Search () {
    // Modify results to include two properties: timeStamp and value, with timeStamp representing request issuance time and value storing the latest results
    const [results, setResults] = useState({
        timeStamp: 0,
        value: [],
    });
    const [searchText, setSearchText] = useState('');

    // Create a reference to store the cancel token
    const cancelToken = useRef();
   
    // Implement a debounced search query setter function
    const setSearchTextDebounced = useCallback(
        _.debounce((text) => {
            setSearchText(text)
        ), [setSearchText]
    );
   
    // Wrap the request within a useEffect hook with searchText as a dependency
    useEffect(() => {
        // Generate a timestamp when the request is made
        const requestTimeStamp = new Date().valueOf();

        // Create a new cancel token for the request and store it in the cancelToken ref
        cancelToken.current = CancelToken.source();            
        
        // Send the request
        const urlWithParams = getUrlWithParams(url, searchText);
        axios.get(urlWithParams, { 
            headers: config.headers,

            // Include the cancel token in the axios request configuration
            cancelToken: source.token 
        }).then(response => {
            if (response.status === 200 && response.data) {
                // When updating the results, compare timestamps to determine data relevance
                setResults(currentState => {
                    // Check if the currentState's timeStamp is newer; if so, do not update the state
                    if (currentState.timeStamp > requestTimeStamp) return currentState;
                  
                    // If older, update the state with the new data
                    return {
                        timeStamp: requestTimeStamp,
                        value: request.data,
                    };
                });
            } else{
               // Handle error cases
            }
        }).catch(error => {
            // Handle errors here
        });
        
        // Add a cleanup function to cancel requests upon component unmount
        return () => { 
            if (cancelToken.current) cancelToken.current.cancel("Component Unmounted!"); 
        };
    }, [searchText]);

    return (
        <View>
            {/* Utilize the setSearchTextDebounced function instead of setSearchText. */}
            <SearchComponent onTextChange={setSearchTextDebounced}/>
            <SearchResults results={results.value}/>
        </View>
    );
}

I've revised my approach to hopefully align with what the original poster desired while ensuring proper request cancellation upon component unmount.

Answer 2

~~If you're aiming to steer clear of external libraries in order to minimize package size, such as axios-hooks, utilizing the CancelToken feature within axios would be your best bet.~~

Implementing the CancelToken feature correctly will not only prevent any warnings from react regarding failing to cancel asynchronous tasks but also provides a useful tool for managing requests effectively.

A detailed explanation of how to implement and utilize the CancelToken feature can be found on Axios's documentation page here. I recommend giving it a read to grasp its functionality and benefits better.

~~This is how you could integrate the CancelToken feature into the example scenario provided:~~

The poster clarified in subsequent responses that they do not intend to incorporate a cancellation feature. In this case, employing a timestamp system might be more appropriate, as illustrated below:

function Search () {
    // Modify results to include two properties: timeStamp and value, with timeStamp representing request issuance time and value storing the latest results
    const [results, setResults] = useState({
        timeStamp: 0,
        value: [],
    });
    const [searchText, setSearchText] = useState('');

    // Create a reference to store the cancel token
    const cancelToken = useRef();
   
    // Implement a debounced search query setter function
    const setSearchTextDebounced = useCallback(
        _.debounce((text) => {
            setSearchText(text)
        ), [setSearchText]
    );
   
    // Wrap the request within a useEffect hook with searchText as a dependency
    useEffect(() => {
        // Generate a timestamp when the request is made
        const requestTimeStamp = new Date().valueOf();

        // Create a new cancel token for the request and store it in the cancelToken ref
        cancelToken.current = CancelToken.source();            
        
        // Send the request
        const urlWithParams = getUrlWithParams(url, searchText);
        axios.get(urlWithParams, { 
            headers: config.headers,

            // Include the cancel token in the axios request configuration
            cancelToken: source.token 
        }).then(response => {
            if (response.status === 200 && response.data) {
                // When updating the results, compare timestamps to determine data relevance
                setResults(currentState => {
                    // Check if the currentState's timeStamp is newer; if so, do not update the state
                    if (currentState.timeStamp > requestTimeStamp) return currentState;
                  
                    // If older, update the state with the new data
                    return {
                        timeStamp: requestTimeStamp,
                        value: request.data,
                    };
                });
            } else{
               // Handle error cases
            }
        }).catch(error => {
            // Handle errors here
        });
        
        // Add a cleanup function to cancel requests upon component unmount
        return () => { 
            if (cancelToken.current) cancelToken.current.cancel("Component Unmounted!"); 
        };
    }, [searchText]);

    return (
        <View>
            {/* Utilize the setSearchTextDebounced function instead of setSearchText. */}
            <SearchComponent onTextChange={setSearchTextDebounced}/>
            <SearchResults results={results.value}/>
        </View>
    );
}

I've revised my approach to hopefully align with what the original poster desired while ensuring proper request cancellation upon component unmount.

Answer 3

Answer №2

In my opinion, a clever solution to this issue involves using the request's original order as a reference point and assigning each request its own order based on the initial sequence. Here is an outline in pseudocode:

// ...
const [itemList, setItemList] = useState([])
const [searchOrder, setSearchOrder] = useState(0)

function getSearchResults(query) { // triggered by input with debounce
  // increase component-level order
  setSearchOrder(searchOrder + 1)

  // assign local order within this scope corresponding to component order
  const localOrder = searchOrder

  myAxios.get('/search?query=' + query)
    .then(function (response) {
      // update the list if the assigned order matches the component-level order
      if (localOrder === searchOrder) {
        setItemList(response)
      }
      // otherwise, do nothing with the outdated response if orders are not equal, indicating a later call received its response sooner
    })
    // .catch(...)
}
// ...

Answer 4

In my opinion, a clever solution to this issue involves using the request's original order as a reference point and assigning each request its own order based on the initial sequence. Here is an outline in pseudocode:

// ...
const [itemList, setItemList] = useState([])
const [searchOrder, setSearchOrder] = useState(0)

function getSearchResults(query) { // triggered by input with debounce
  // increase component-level order
  setSearchOrder(searchOrder + 1)

  // assign local order within this scope corresponding to component order
  const localOrder = searchOrder

  myAxios.get('/search?query=' + query)
    .then(function (response) {
      // update the list if the assigned order matches the component-level order
      if (localOrder === searchOrder) {
        setItemList(response)
      }
      // otherwise, do nothing with the outdated response if orders are not equal, indicating a later call received its response sooner
    })
    // .catch(...)
}
// ...

Answer 5

Answer №3

To ensure we receive the most recent API response, we can implement a solution like the following:

function search() {
    ...
    const [timeStamp, setTimeStamp] = "";
    ...


    function getSearchResults(searchText) {

        // A local variable that stores the timestamp of when it was called
    const reqTimeStamp = new Date().getTime();

        // The timestamp will always be updated each time a new function call is made for searching, ensuring we have the latest timestamp of the last API call
    setTimeStamp(reqTimeStamp)

    axios.get(...)
        .then(response => {

            // We compare reqTimeStamp with timeStamp (which holds the timestamp of the latest API call) - if they match, we have received the latest API response 
            if(reqTimeStamp === timeStamp) {
                return result; // or process the data as needed
            } else {

            // Timestamps do not match
            return ;
            }

        })
        
     }

}

Answer 6

To ensure we receive the most recent API response, we can implement a solution like the following:

function search() {
    ...
    const [timeStamp, setTimeStamp] = "";
    ...


    function getSearchResults(searchText) {

        // A local variable that stores the timestamp of when it was called
    const reqTimeStamp = new Date().getTime();

        // The timestamp will always be updated each time a new function call is made for searching, ensuring we have the latest timestamp of the last API call
    setTimeStamp(reqTimeStamp)

    axios.get(...)
        .then(response => {

            // We compare reqTimeStamp with timeStamp (which holds the timestamp of the latest API call) - if they match, we have received the latest API response 
            if(reqTimeStamp === timeStamp) {
                return result; // or process the data as needed
            } else {

            // Timestamps do not match
            return ;
            }

        })
        
     }

}

Receive axios responses in the exact order as the requests for efficient search functionality

Answer №1

Answer №2

Answer №3

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