Javascript variable scope

try

success: function(msg)
                   {
                       widget_id = msg; alert(widget_id);
                   }

what does it show?

it cannot come from success handler, since success handler is a call back handler which is called asynchronously.

what you need to do is, that the method which needs the widget id needs to get called from the success handler.

I guess you should use async=false

async: false

$.ajax({
         //ajaxsetup ftw
          async: false,
          data: {
              'action': 'add_element',
              'page_id': '106034386126175',
              'element_id' : alias
          },
          success: function(msg)
                   {
                       widget_id = msg;
                   }
        });

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@HainKurt:

Works fine, widget_id alerts the correct value.

I guess you should change your logic a bit :) if you do not want to use async
when it succeded, call another function to do the remaining jobs (if any)

success: function(msg)
                   {
                       widget_id = msg; fnDataSaved(msg);
                   }

but did you try async? it may be what you want...

oups I forget to add the data line 5 :

return $.ajax({ url: "some.php", data:d, async: false }).responseText;

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Cool, that's what I wanted :)