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Chapter 4 - Cookies & Browser Data
For MSBTE Diploma CO / IT / AIML Branch
Define Cookies -:
In JavaScript, cookies are used to store small pieces of data, such as user preferences, session information, or tracking data. These cookies are stored as key-value pairs in the browser and are sent back to the server on each request.
Types of Cookies -:
In JavaScript, cookies can be classified into different types based on their lifespan, security, and scope. Here’s a breakdown of the types of cookies:
1. Session Cookies
- Description: These cookies are stored in memory and last only for the duration of the user’s browsing session. They are deleted once the user closes the browser.
- Use Case: Commonly used for temporary data, such as keeping a user logged in while navigating a website.
- Example: Shopping cart data that is cleared after the user leaves the site.
2. Persistent Cookies
- Description: These cookies have an expiration date or a maximum age set. They are stored on the user’s device until they expire or are manually deleted by the user or application.
- Use Case: Useful for remembering login credentials, user preferences, or tracking user behavior over a long period.
- Example: Storing a user’s preferred language for future visits.
Creating Cookie -:
To create a cookie, you can assign a string to document.cookie. The string must include a name-value pair, and you can optionally add other attributes like expires, path, etc.
Reading Cookie -:
To read a cookie, you can use the document.cookie property. This returns all cookies in a single string. You may need to parse it to get a specific cookie.
Deleting Cookie -:
To delete a cookie, set its expires attribute to a past date.
Cookie Complete Example -:
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