encodeURIComponent(text)

Encodes a URI component by replacing certain characters with escape sequences representing the UTF-8 encoding. Unlike encodeURI, it also encodes characters such as ?, =, & and /, making it suitable for encoding individual components of a URL.

Encodes as in standard JavaScript: a space becomes %20, hex digits are upper case (%3F), and A–Z a–z 0–9 - _ . ! ~ * ' ( ) are left as they are. Because ' is not encoded, put the value in an attribute with double quotes (href="…"), never single quotes. null and undefined return null.

Earlier versions of Docly encoded like an HTML form (a space became +). decodeURIComponent no longer turns + into a space either; read values that were stored that way with urlDecode(). For form encoding, use urlEncode().