Re: [xwiki-users] Strange ajax + json issue - xwiki-users@xwiki.org

2 Mar 2010

Hello,
Can't it be a timing problem ? When using Firebug, the system has time to retrieve
result from the AJAX request but at execution time it has not ?
...
  -----Message d'origine-----
 De : users-bounces(a)xwiki.org [mailto:users-bounces@xwiki.org]
 De la part de Jeremie BOUSQUET
 Envoyé : mardi 2 mars 2010 08:30
 À : XWiki Users
 Objet : Re: [xwiki-users] Strange ajax + json issue
 Hello & thx Sergiu,
 I changed to json content-type, and responseJSON as you proposed.
 I checked that my GET request is 200 OK, and in the response
 the JSON tab in
 Firebug shows well formed JSON. But still my json variable is empty at
 execution time !
 By the way if I breakpoint on or before the Ajax.Request()
 and step over the
 code, the json variable gets properly initiated and executed.
 Where it's
 used afterwards, it's perfectly well formed.
 I also added url parameters as 'parameters' of Ajax.Request instead of
 directly in the url but no change.
 Could it be a problem in the way I pass my json variable ?
 Declared outside
 of Ajax.Request(...) ? It must be something really stupid but
 I just don't
 understand ...
 Jeremie
 2010/3/2 Sergiu Dumitriu &lt;sergiu(a)xwiki.com&gt;
  On 03/02/2010 01:15 AM, Jeremie BOUSQUET wrote:
 > Hello,
 >
 > This is for something I'm trying to develop ... And I'm   not sure it
has
  > something to do with XWiki, but who knows ?
 >
 > In a page I call a particular init() function like this :
 >
 > Event.observe(window, "load", init);
 >
 > This init() aims at loading some JSON data from another   page using Ajax.
  I
  was inspired by the livetable.js here :-)
 var json = ""
 var ajx=new Ajax.Request(  "
 
  
 http://localhost:8081/xwiki/bin/view/Dev/JSONProvider?xpage=pl
 ain&outputSyntax=plain
  ",
 You should use what Prototype already offers:
 - set the proper MIME type for the response from velocity, with
 $response.setContentType('application/json')
 - write well formed JSON (also include the ( and ) that you append
 before the eval in your current code
 - use transport.responseJSON to read the already parsed JSON data
 >     {method:"get",    onSuccess:function(transport)  {  json =
 > eval("("+transport.responseText+")");  }
 >     }
 > )
 >
 > This Javascript is in a .js file along with other   resources on the server
  > filesystem. It is loaded with
$xwiki.jsfx.use(...) .
 > When I debug step by step using Firebug, everything is   fine,
"json"
  variable
 > contains what I expect.
 > But when I'm not debugging and refresh the page, "json"  
variable is empty
  > ... (breakpointing AFTER ajax call shows
it). Though I   can see in Firebug
   that my
Ajax http request finished with a 200 OK code. 
 Can you also check the content of the response, to see if it's well
 formed JSON? If you also set the right MIME type, then   Firebug should
  provide a tab with the JSON data of the response
(depends   on the actual
  Firebug version).
 > Do you think it might be linked to the fact this method   is called on page
  > load ? I can't see how it's
different than other ajax   calls in xwiki ...

 --
 Sergiu Dumitriu
 http://purl.org/net/sergiu/
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