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

[Jeremie BOUSQUET]

Great thank you, you were right - executing everything in onSuccess() solved
my issue ! :)

I'm working on integrating JavaScript InfoVis Toolkit
with XWiki - at least some graphs. So now I can
successfully display an
hyperbolic tree in a wiki page with json data provided from another page :)
My primary intent was to display parent-child relation-ships using a
SpaceTree, a bit like the MindMap snippet.

Thanks again for your help Sergiu,
Jeremie

2010/3/2 Jeremie BOUSQUET 

> Yes, the purpose was to use json var after the Ajax.Request() block ...
> Understood, I will make a function of the rest of the code and pass in the
> onSuccess, thanks.
>
> I tried the asynchronous:false with no different result, but I would have
> to test again to be sure.
>
> Thx,
> Jeremie
>
> 2010/3/2 Sergiu Dumitriu 
>
>> 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=plain&outputSyntax=plain
>> ",
>> >
>> > {method:"get",onSuccess:function(transport)  {  json =
>> > eval("("+transport.responseText+")");  }
>> > }
>> > )
>>
>> Wait, do you use json here, after the new Ajax.Request? You can't do
>> that. You should put the code using json inside the onSuccess handler.
>>
>> Alternatively, you can add
>> asynchronous: false,
>> to the list of parameters to make the call synchronous, which means that
>> the new Ajax.Request line will block until the response arrives. But
>> this is bad for several reasons: in most of the current browsers it
>> blocks the entire browser until the response arrives, so if the server
>> is slow to respond, you'll lock the user outside the browser; the method
>> might fail, so onSuccess will not be called, and json will still have
>> the wrong value.
>>
>> > 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.
>> >
>> > 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/
>> ___
>> users mailing list
>> users@xwiki.org
>> http://lists.xwiki.org/mailman/listinfo/users
>>
>
>
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Re: [xwiki-users] Strange ajax + json issue

[Jeremie BOUSQUET]

Yes, the purpose was to use json var after the Ajax.Request() block ...
Understood, I will make a function of the rest of the code and pass in the
onSuccess, thanks.

I tried the asynchronous:false with no different result, but I would have to
test again to be sure.

Thx,
Jeremie

2010/3/2 Sergiu Dumitriu 

> 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=plain&outputSyntax=plain
> ",
> >
> > {method:"get",onSuccess:function(transport)  {  json =
> > eval("("+transport.responseText+")");  }
> > }
> > )
>
> Wait, do you use json here, after the new Ajax.Request? You can't do
> that. You should put the code using json inside the onSuccess handler.
>
> Alternatively, you can add
> asynchronous: false,
> to the list of parameters to make the call synchronous, which means that
> the new Ajax.Request line will block until the response arrives. But
> this is bad for several reasons: in most of the current browsers it
> blocks the entire browser until the response arrives, so if the server
> is slow to respond, you'll lock the user outside the browser; the method
> might fail, so onSuccess will not be called, and json will still have
> the wrong value.
>
> > 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.
> >
> > 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/
> ___
> users mailing list
> users@xwiki.org
> http://lists.xwiki.org/mailman/listinfo/users
>
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Re: [xwiki-users] Strange ajax + json issue

[Sergiu Dumitriu]

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=plain&outputSyntax=plain";,
>
> {method:"get",onSuccess:function(transport)  {  json =
> eval("("+transport.responseText+")");  }
> }
> )

Wait, do you use json here, after the new Ajax.Request? You can't do 
that. You should put the code using json inside the onSuccess handler.

Alternatively, you can add
asynchronous: false,
to the list of parameters to make the call synchronous, which means that 
the new Ajax.Request line will block until the response arrives. But 
this is bad for several reasons: in most of the current browsers it 
blocks the entire browser until the response arrives, so if the server 
is slow to respond, you'll lock the user outside the browser; the method 
might fail, so onSuccess will not be called, and json will still have 
the wrong value.

> 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.
>
> 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 ...
>


-- 
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http://purl.org/net/sergiu/
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Re: [xwiki-users] Strange ajax + json issue

[Marius Dumitru Florea]

Marius Dumitru Florea wrote:
> Hi Jeremie,
> 
> Jeremie BOUSQUET wrote:
>> 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 ...
> 
> Assign a default value to your json variable before making the request 
> then invoke the Firebug debugger in your onSuccess handler by simply 
> writing:
> 
> debugger;
> 
> before the response assignation. Refresh the page and check if your json 
> variable has the default value before being assigned with the JSON 
> response and if the response if evaluated correctly. If all this is fine 
> then maybe your json variable is affected elsewhere.

As you know, A in AJAX comes from Asynchronous so don't use your json 
variable before the response is received, i.e. before the onSuccess 
handler is called.

> 
> Hope this helps,
> Marius
> 
>> Jeremie
>>
>> 2010/3/2 Sergiu Dumitriu 
>>
>>> 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=plain&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/
>>> ___
>>> users mailing list
>>> users@xwiki.org
>>> http://lists.xwiki.org/mailman/listinfo/users
>>>
>> ___
>> users mailing list
>> users@xwiki.org
>> http://lists.xwiki.org/mailman/listinfo/users
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Re: [xwiki-users] Strange ajax + json issue

[Marius Dumitru Florea]

Hi Jeremie,

Jeremie BOUSQUET wrote:
> 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 ...

Assign a default value to your json variable before making the request 
then invoke the Firebug debugger in your onSuccess handler by simply 
writing:

debugger;

before the response assignation. Refresh the page and check if your json 
variable has the default value before being assigned with the JSON 
response and if the response if evaluated correctly. If all this is fine 
then maybe your json variable is affected elsewhere.

Hope this helps,
Marius

> 
> Jeremie
> 
> 2010/3/2 Sergiu Dumitriu 
> 
>> 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=plain&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/
>> ___
>> users mailing list
>> users@xwiki.org
>> http://lists.xwiki.org/mailman/listinfo/users
>>
> ___
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> users@xwiki.org
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Re: [xwiki-users] Strange ajax + json issue

[PERINAUD Christophe]

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-boun...@xwiki.org [mailto:users-boun...@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 
> 
> > 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/
> > ___
> > users mailing list
> > users@xwiki.org
> > http://lists.xwiki.org/mailman/listinfo/users
> >
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Re: [xwiki-users] Strange ajax + json issue

[Jeremie BOUSQUET]

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 

> 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=plain&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/
> ___
> users mailing list
> users@xwiki.org
> http://lists.xwiki.org/mailman/listinfo/users
>
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Re: [xwiki-users] Strange ajax + json issue

[Sergiu Dumitriu]

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=plain&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 ...

-- 
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http://purl.org/net/sergiu/
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[xwiki-users] Strange ajax + json issue

[Jeremie BOUSQUET]

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=plain&outputSyntax=plain";,

   {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.

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 ...


Thanks for any help,
Jeremie
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