Variable visibility in callbacks functions - dojo

Question

I did this function for get results of a query directly in an useful datastructure. The problem is the follow: in the first console.log() call , inside the callback function, the stored_data var contains the exact results, in the second console.log() call the stored_data variable looks like not initialized. Suggestions??
Below the code:
function dojo_query_mysql(query_string) {
//The parameters to pass to xhrPost, the message, and the url to send it to
//Also, how to handle the return and callbacks.
var stored_data;
var raw_data = new Object;
var xhrArgs = {
url: "query.php",
postData: query_string,
handleAs: "text",
load: function(data) {
raw_data = dojo.fromJson(data);
stored_data = new dojo.data.ItemFileReadStore({data: raw_data});
console.log(stored_data);
},
error: function(error) {
//We'll 404 in the demo, but that's okay. We don't have a 'postIt' service on the
//docs server.
//stored_data = error;
}
}
//Call the asynchronous xhrPost
var deferred = dojo.xhrPost(xhrArgs);
console.log(stored_data);
return stored_data;
}

Answer 1

I have just remembered that the function doesn't wait the end of the callback execution, for wait the callback end just do a little change to the code:
var xhrArgs = {
url: "query.php",
sync: true, // THIS IS FORCE THE SYNCRONIZATION BETWEEN THE CALLBACK AND THE CODE
postData: query_string,
handleAs: "text",
load: function(data) {
raw_data = dojo.fromJson(data);
stored_data = new dojo.data.ItemFileReadStore({data: raw_data});
console.log(stored_data);
},
error: function(error) {
//We'll 404 in the demo, but that's okay. We don't have a 'postIt' service on the
//docs server.
//stored_data = error;
}
}