Using session storage for storing user-specific calendar events and reminders in JavaScript

21 Sep 2023

With the increasing need for dynamic web applications, the ability to store user-specific data becomes crucial. In this blog post, we will explore how we can use session storage to store calendar events and reminders for individual users using JavaScript.

What is Session Storage?

Session Storage is a web storage API that allows us to store key-value pairs in a user’s browser session. Unlike local storage, session storage data is cleared when the user closes their browser or tabs. This makes it ideal for storing temporary data that only needs to persist within the same session.

Storing Calendar Events and Reminders

To store user-specific calendar events and reminders using session storage, we can follow these steps:

Step 1: Creating the Data Structure

// Check if session storage is supported by the browser
if (typeof sessionStorage !== 'undefined') {
  // Check if the user's events already exist in session storage
  let existingEvents = sessionStorage.getItem('userEvents');

  if (existingEvents) {
    // If events exist, parse the JSON and store it in a variable
    let userEvents = JSON.parse(existingEvents);

    // Add new event to the existing events array
    userEvents.push(newEvent);

    // Save the updated array back to session storage
    sessionStorage.setItem('userEvents', JSON.stringify(userEvents));
  } else {
    // If no events exist, create a new array with the event and store it in session storage
    let userEvents = [newEvent];
    sessionStorage.setItem('userEvents', JSON.stringify(userEvents));
  }
}

Step 2: Retrieving the Stored Events

// Retrieve the user's events from session storage
if (typeof sessionStorage !== 'undefined') {
  let storedEvents = sessionStorage.getItem('userEvents');

  if (storedEvents) {
    // Parse the JSON and store it in a variable
    let userEvents = JSON.parse(storedEvents);

    // Use the events for further processing or display
    console.log(userEvents);
  }
}

Step 3: Removing Events

// Remove an event from the user's events
if (typeof sessionStorage !== 'undefined') {
  let storedEvents = sessionStorage.getItem('userEvents');

  if (storedEvents) {
    // Parse the JSON and store it in a variable
    let userEvents = JSON.parse(storedEvents);

    // Find and remove the desired event from the array
    let eventIdToRemove = 123;
    userEvents = userEvents.filter(event => event.id !== eventIdToRemove);

    // Save the updated array back to session storage
    sessionStorage.setItem('userEvents', JSON.stringify(userEvents));
  }
}

Conclusion

Using session storage in JavaScript provides a convenient way to store user-specific calendar events and reminders within a single session. This approach allows users to interact with the application dynamically without the need for server-side storage. Remember to consider browser compatibility when implementing session storage, as some older browsers may have limited or no support for this feature.

#hashtags: #JavaScript #SessionStorage