[jQuery] Jquery Ajax dropping special characters

[damitha]

I am trying to send an mysql query to the server from a client
programme by
using the jquery  $.ajax({}) function. The query string comprises of +
sign
which is used to assign student grades (such as C+). The server side
programming is in php. However I have realized at the time of sending
the Ajax
request jquery drops + signs from the query string.  Is there any way
to stop
dropping of + character from the query string.