escape string (% character) in encodeURI in JavaScript

Question

I have a problem where I need to preserve %2F in a URI string. However, encodeURI encodes % as %25 (as normal), so the whole string ends up being %252F instead of %2F. How can I escape this so the % doesn't get encoded. This is happening deep within a framework, so JS manipulation is not an option, it needs to be done via string escaping. I've tried using \ in a number of ways, none of it is working.

Answer 1

If you have control during the decode process, an unescape() before decodeURI would help. This way, every double encoding is consistently handled.

For example:

decodeURIComponent(unescape("http%253A%252F%252Fabcd.com"));

will return

'http://abcd.com'