Can I use JavaScript to automatically refresh Session Storage data before it expires

javascript
// Set the expiration time (in milliseconds)
const expirationTime = 30 * 60 * 1000; // 30 minutes

// Function to check and refresh session storage data
function checkAndRefreshSessionStorage() {
  const storageKey = 'your-session-storage-key';
  const now = new Date().getTime();
  const storedData = sessionStorage.getItem(storageKey);

  if (storedData) {
    const storedDataObject = JSON.parse(storedData);
    const expirationDate = new Date(storedDataObject.timestamp).getTime();

    if (now > expirationDate) {
      // Data has expired, fetch new data and update session storage
      fetchAndStoreNewData(storageKey);
    } else {
      // Data is still valid, return the stored data
      return storedDataObject.data;
    }
  } else {
    // No data in session storage, fetch new data and store it
    fetchAndStoreNewData(storageKey);
  }
}

// Function to fetch new data and store it in session storage
function fetchAndStoreNewData(key) {
  // Fetch new data from your API or other source
  const newData = fetchDataFromSource();

  // Store the new data in session storage with a timestamp
  const dataObject = {
    timestamp: new Date().getTime(),
    data: newData
  };
  sessionStorage.setItem(key, JSON.stringify(dataObject));

  return newData;
}

// Example usage
const data = checkAndRefreshSessionStorage();
if (data) {
  // Use the retrieved data
  console.log(data);
} else {
  // Data was refreshed, use the new data
  console.log(fetchAndStoreNewData('your-session-storage-key'));
}

Here's how the code works:

1. The `expirationTime` variable sets the expiration time for the session storage data (in this example, 30 minutes).
2. The `checkAndRefreshSessionStorage()` function checks if the data in session storage has expired. It retrieves the stored data, checks the timestamp, and compares it with the current time.
3. If the data has expired, the `fetchAndStoreNewData()` function is called to fetch new data and store it in session storage with a new timestamp.
4. If the data is still valid, the function returns the stored data.
5. The `fetchAndStoreNewData()` function is responsible for fetching new data (from an API or other source) and storing it in session storage with a timestamp.

You can call the `checkAndRefreshSessionStorage()` function periodically (e.g., using `setInterval()`) to ensure that the session storage data is always up-to-date and hasn't expired.

This approach allows you to automatically refresh the session storage data before it expires, ensuring that your application always has the latest data available without the need for manual refreshes or user interactions.