How Can You Preserve JavaScript Variables Across Multiple Web Pages?

Preserving JavaScript Variables Across Multiple Pages: A Comprehensive Explanation

It can be imperative to retain JavaScript variables across multiple web pages for various applications. Suppose you have a JavaScript variable 'someVar' set to 5 on Page A. As you navigate to Page B by clicking a hyperlink, how can you ensure 'someVar' retains its value of 5?

Solution: Leveraging JavaScript Session

JavaScript provides a mechanism called "JavaScript session" which allows you to store data persistently within a single window or tab. The 'window.name' property serves as a persistent storage space for data.

Implementation:

1. On Page A, set 'someVar' using 'window.someVar = 5;'.
2. As you transition to Page B, utilize 'window.name' to store 'someVar' as a JSON object:

window.name = JSON.stringify({ someVar: 5 });

3. On Page B, retrieve the stored value using:

const storedData = JSON.parse(window.name);
const someVar = storedData.someVar;

Limitations:

JavaScript session is confined to the same window/tab. Opening a new window or browsing session will reset 'someVar' to its default value.

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