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Jquery and $.ajax, how to retrieve data from POST...

Hey Guys and Gals,
I am finally stepping into the world of Ajax and I have a question.... How do I grab values that are returned from a script the javascript POSTed to?

This is what I am trying to do:

I have a 'Promo Code' field and want to check to see if the promo code is valid. The javascript (JQuery) will post to my script and then send some data back (example: the Promotion Name that is tied to the promo code).

Here is some generic code, check the commented code for my issues...

$.ajax({
  type: "POST",
  url: "some.php",
  data: "name=John&location=Boston",
}).done(function( msg ) { //---- It looks like 'msg' is the returned value from the some.php script.
  alert( "Data Saved: " + msg );

//How do I send 'msg' from the some.php file back to my requesting page?  Should 'msg' be a javascript variable in some.php?
});

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Thanks for the help!

SOLUTION

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Slim81

ASKER

haloexpertsexchange,
Thanks for the reply.

Anything that the browser would display?

In the example I provided (pulled from the JQuery website), they use the variable/parameter of 'msg' in the '.done' function. Do I have to reference or create 'msg' on the some.php file or am I free to name that variable/parameter whatever I want?

Thanks!

ASKER CERTIFIED SOLUTION