Javascript equivalent to php's urldecode()
You could use the decodeURIComponent function to convert the %xx into characters. However, to convert + into spaces you need to replace them in an extra step.
function urldecode(url) { return decodeURIComponent(url.replace(/\+/g, ' '));}
Check out this one
function urldecode (str) { return decodeURIComponent((str + '').replace(/\+/g, '%20'));}