[jQuery] Re: Callback-return into global variable

[J Moore]

Couple of thoughts:

1) $.each() is not for moving through an array. (is for doing
something to each matched DOM element) try: for(item in _json)
{ alert('item:'+item);}

2) try defining your global as an object. e.g. var _json = {};

-jason

On Jan 16, 2:17 am, Niels [EMAIL PROTECTED] wrote:
 Is there any way to put a return from within a callback into a global
 variable? I'm trying to retrieve JSON-values in one statement, and
 output them in another statement; and code looks like this:

 var _json;

 function load_comments(id, params) {
 if (typeof id != 'number'  typeof id == 'object'  params == null)
 {
 // Only the params were specified.
 _params = process_params(id);

 $.getJSON(paths.get_comment, _params, function(data) { _json 
 = data;
 return _json; });
 console.info('1 : $.getJSON(' + paths.get_comment + ', ' + 
 _params +
 ')');
 }

 }

 function display_comments() {
 load_comments();
 $.each(_json.comments, function(comment) {
 $(#recent-comments-list).append(li + comment.content + 
 /
 li);
 });

 }

 Unfortunately, _json seems to remain undefined... What am I doing
 wrong? Or is there really no way to accomplish this?

 Thanks a lot!
 Niels

[jQuery] Re: Callback-return into global variable

[Danny]

$.getJSON and all the AJAX functions are asynchronous; the function
returns before it gets any result. That's why there's a callback
function: it gets called when the data are available. So when you
write
 load_comments();
 $.each(_json.comments, function(comment) {
load_comments() just sets up the AJAX call and returns, so the each
starts with _json not yet initialized. You can get around it by using
asynch: false in a $.ajax call (see the documentation), but that's not
the ideal solution. Better to put your $.each into the callback
function:
$.getJSON(paths.get_comment, _params, function(data)
{
   $.each (data.comments, function (comment){...})
 });

Danny


On Jan 16, 1:17 am, Niels [EMAIL PROTECTED] wrote:
 Is there any way to put a return from within a callback into a global
 variable? I'm trying to retrieve JSON-values in one statement, and
 output them in another statement; and code looks like this:

 var _json;

 function load_comments(id, params) {
 if (typeof id != 'number'  typeof id == 'object'  params == null)
 {
 // Only the params were specified.
 _params = process_params(id);

 $.getJSON(paths.get_comment, _params, function(data) { _json 
 = data;
 return _json; });
 console.info('1 : $.getJSON(' + paths.get_comment + ', ' + 
 _params +
 ')');
 }

 }

 function display_comments() {
 load_comments();
 $.each(_json.comments, function(comment) {
 $(#recent-comments-list).append(li + comment.content + 
 /
 li);
 });

 }

 Unfortunately, _json seems to remain undefined... What am I doing
 wrong? Or is there really no way to accomplish this?

 Thanks a lot!
 Niels