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

Posted on 2011-10-20
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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!
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Question by:Slim81
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Assisted Solution

by:haloexpertsexchange
haloexpertsexchange earned 2000 total points
ID: 37000746
msg should contain any output that came from the some.php page.
The output would be anything that you would echo out from the page. Basically anything that you would be sending to the browser for display.
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Author Comment

by:Slim81
ID: 37000817
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!
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LVL 13

Accepted Solution

by:
haloexpertsexchange earned 2000 total points
ID: 37000871
you do not need to reference or create msg on the php file.
So you what you will normally be getting back is html or possibly javascript output which you can then manipulate as you want.
I have used ajax calls to give me whole tables of html output and I have also used it to return to me a customized javascript function. Basically you can send back anything and don't need to reference any special variable on the server side.
But that also means don't echo anything out on that page except for what you want to be returned because you will get everything.
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LVL 4

Author Comment

by:Slim81
ID: 37000889
Brilliant.  JQuery has made ajax easy for me to understand.

ajax rocks.

Thanks for your help!
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