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JSON object not parsing in firefox

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saril.ks@gmail.com - 27 Sep 2007 18:57 GMT
Hi
The JSON object I am using is as below . this object is returned after
an AJAX call

{"application" :[
{optionValue:"101", optionDisplay: "estmt"},
{optionValue:"11", optionDisplay: "Arif"},
{optionValue:"12", optionDisplay: "JC"}
]}

In the JS i am using the below code

data = ajaxRequest.responseText ;
var jsonOBJ = eval('(' + data + ')');
len  = jsonOBJ.application.length ;
key =  jsonOBJ.application[i].optionValue ;
value =  jsonOBJ.application[i].optionDisplay ;

Internet Explorer is able to process the above code , but while trying
from Firefox , I am getting the below error message

jsonOBJ has no properties
[Break on this error] len = jsonOBJ.application.length ;

Please help

Thanks
S
Reply to this Message
David Mark - 27 Sep 2007 19:11 GMT
On Sep 27, 1:57 pm, saril...@gmail.com wrote:
> Hi
> The JSON object I am using is as below . this object is returned after
[quoted text clipped - 24 lines]
> Thanks
> S

I couldn't break Firefox with this:

var data = '{"application" :[\n\r{optionValue:"101", optionDisplay:
"estmt"},\n\r {optionValue:"11", optionDisplay: "Arif"},\n\r
{optionValue:"12", optionDisplay: "JC"}\n\r ]}';
var jsonOBJ = eval('(' + data + ')');
len  = jsonOBJ.application.length;
alert(len);

Are you sure about the responseText value?
Reply to this Message
saril.ks@gmail.com - 27 Sep 2007 19:31 GMT
> On Sep 27, 1:57 pm, saril...@gmail.com wrote:
>
[quoted text clipped - 39 lines]
>
> - Show quoted text -

Hi
Thanks for the reply . I am geting the responseText value as below

{"application" :[ {optionValue:"101", optionDisplay: "estmt"},
{optionValue:"11", optionDisplay: "Arif"
},{optionValue:"12", optionDisplay: "JC"}]}

jsonOBJ has no properties
[Break on this error] len = jsonOBJ.application.length ;

appreciate your help
Reply to this Message
David Mark - 27 Sep 2007 19:36 GMT
On Sep 27, 2:31 pm, saril...@gmail.com wrote:

> > On Sep 27, 1:57 pm, saril...@gmail.com wrote:
>
[quoted text clipped - 52 lines]
>
> appreciate your help

So try what I did.  Does it work for you?
Reply to this Message
Thomas 'PointedEars' Lahn - 27 Sep 2007 20:13 GMT
>> I couldn't break Firefox with this:
>>
[quoted text clipped - 15 lines]
> {optionValue:"11", optionDisplay: "Arif"
> },{optionValue:"12", optionDisplay: "JC"}]}

Evaluating that results in a compile error:

| Error: invalid label

Tested in Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.7)
Gecko/20070914 Firefox/2.0.0.7 (with Firebug 1.05).

In contrast,

[ {optionValue:"101", optionDisplay: "estmt"}, {optionValue:"11",
optionDisplay: "Arif"},{optionValue:"12", optionDisplay: "JC"}]

evaluates fine.

> jsonOBJ has no properties
> [Break on this error] len = jsonOBJ.application.length ;

Because jsonOBJ would have the value `undefined' if the evaluation failed,
if that.

PointedEars
Signature

Anyone who slaps a 'this page is best viewed with Browser X' label on
a Web page appears to be yearning for the bad old days, before the Web,
when you had very little chance of reading a document written on another
computer, another word processor, or another network. -- Tim Berners-Lee

Reply to this Message
Thomas 'PointedEars' Lahn - 27 Sep 2007 20:17 GMT
>> [...] I am geting the responseText value as below
>>
[quoted text clipped - 15 lines]
>
> evaluates fine.

{application: [ {optionValue:"102", optionDisplay: "estmt"},
{optionValue:"11", optionDisplay: "Arif"},{optionValue:"12", optionDisplay:
"JC"}]}

is OK, too.

PointedEars
Signature

Anyone who slaps a 'this page is best viewed with Browser X' label on
a Web page appears to be yearning for the bad old days, before the Web,
when you had very little chance of reading a document written on another
computer, another word processor, or another network. -- Tim Berners-Lee

Reply to this Message
Thomas 'PointedEars' Lahn - 27 Sep 2007 20:26 GMT
>>> [...] I am geting the responseText value as below
>>>
[quoted text clipped - 20 lines]
>
> is OK, too.

I presume the reason why it breaks with `"application":' is that the outer
`{...}' is regarded as delimiters of a block statement by eval(), and not as
delimiters of the Object literal notation.  Hence eval()uating the variant
with `application:' yields only the Array object, which has no `application'
property.  Both `"application":' and `application:' are merely regarded as
labels in a block statement there, with the former being invalid.

PointedEars
Signature

var bugRiddenCrashPronePieceOfJunk = (
   navigator.userAgent.indexOf('MSIE 5') != -1
   && navigator.userAgent.indexOf('Mac') != -1
)  // Plone, register_function.js:16

Reply to this Message
saril.ks@gmail.com - 27 Sep 2007 22:21 GMT
On Sep 27, 12:26 pm, Thomas 'PointedEars' Lahn <PointedE...@web.de>
wrote:
> >> saril...@gmail.com wrote:
> >>> [...] I am geting the responseText value as below
[quoted text clipped - 37 lines]
>
> - Show quoted text -

Hi
I got the solution .  tried without quotes and it worked fine . Thanks
to all for the help

S
Reply to this Message
Thomas 'PointedEars' Lahn - 27 Sep 2007 22:45 GMT
>> I presume the reason why it breaks with `"application":' is that the outer
>> `{...}' is regarded as delimiters of a block statement by eval(), and not as
[quoted text clipped - 3 lines]
>> labels in a block statement there, with the former being invalid.
>> [...]

Please trim your quotes.  http://jibbering.com/faq/

> Hi
> I got the solution .  tried without quotes and it worked fine . Thanks
> to all for the help

I don't think you have relized yet that you are shooting yourself in the
foot.  As I have pointed out, because of the block statement - object
literal and property name - label ambiguities, `jsonOBJ.application.length'
may or may not work with unquoted `application', depending on the script
engine that compiles this.  You should use JSON.parse() instead.

PointedEars
Signature

var bugRiddenCrashPronePieceOfJunk = (
   navigator.userAgent.indexOf('MSIE 5') != -1
   && navigator.userAgent.indexOf('Mac') != -1
)  // Plone, register_function.js:16

Reply to this Message
saril.ks@gmail.com - 27 Sep 2007 22:53 GMT
On Sep 27, 2:45 pm, Thomas 'PointedEars' Lahn <PointedE...@web.de>
wrote:
> saril...@gmail.com wrote:
> >> I presume the reason why it breaks with `"application":' is that the outer
[quoted text clipped - 23 lines]
>     && navigator.userAgent.indexOf('Mac') != -1
> )  // Plone, register_function.js:16

I did not use JSON.parse()  as it was throwing exceptions in firefox .
But when i unquoted the 'application' , i am able to parse the
jsonOBJ .  Do you have any snippets to handle JSON.parse()
exception ?

Thanks
S
Reply to this Message
Thomas 'PointedEars' Lahn - 29 Sep 2007 14:16 GMT
> I did not use JSON.parse()  as it was throwing exceptions in firefox .
> But when i unquoted the 'application' , i am able to parse the
> jsonOBJ .  Do you have any snippets to handle JSON.parse()
> exception ?

try
{
 ajaxRequest.responseText.parseJSON()
}
catch (e)
{
 // ...
}

PointedEars
Signature

   realism:    HTML 4.01 Strict
   evangelism: XHTML 1.0 Strict
   madness:    XHTML 1.1 as application/xhtml+xml
                                                   -- Bjoern Hoehrmann

Reply to this Message
Randy Webb - 29 Sep 2007 21:09 GMT
Thomas 'PointedEars' Lahn said the following on 9/29/2007 9:16 AM:
>> I did not use JSON.parse()  as it was throwing exceptions in firefox .
>> But when i unquoted the 'application' , i am able to parse the
>> jsonOBJ .  Do you have any snippets to handle JSON.parse()
>> exception ?
>
> try

Error prone on the web.

Signature

Randy
Chance Favors The Prepared Mind
comp.lang.javascript FAQ - http://jibbering.com/faq/index.html
Javascript Best Practices - http://www.JavascriptToolbox.com/bestpractices/

Reply to this Message
Thomas 'PointedEars' Lahn - 30 Sep 2007 10:02 GMT
> Thomas 'PointedEars' Lahn said the following on 9/29/2007 9:16 AM:
>>> I did not use JSON.parse()  as it was throwing exceptions in firefox .
                                         ^^^^^^^^^^^^^^^^^^^
>>> But when i unquoted the 'application' , i am able to parse the
>>> jsonOBJ .  Do you have any snippets to handle JSON.parse()
>>> exception ?
>> try
>
> Error prone on the web.

Because of NN/IE 4.x?

It adds no more error-proneness here because -- surprise, surprise! -- the
current JSON parser implementation in J(ava)Script already uses `throw' to
throw the aforementioned exception:

http://www.json.org/js.html

The incompatibility with try...catch in ECMAScript < 3 implementations can
be worked around proprietarily with window.onerror and eval(), though.

PointedEars
Signature

var bugRiddenCrashPronePieceOfJunk = (
   navigator.userAgent.indexOf('MSIE 5') != -1
   && navigator.userAgent.indexOf('Mac') != -1
)  // Plone, register_function.js:16

Reply to this Message
Randy Webb - 30 Sep 2007 11:21 GMT
Thomas 'PointedEars' Lahn said the following on 9/30/2007 5:02 AM:
>> Thomas 'PointedEars' Lahn said the following on 9/29/2007 9:16 AM:
>>>> I did not use JSON.parse()  as it was throwing exceptions in firefox .
[quoted text clipped - 6 lines]
>
> Because of NN/IE 4.x?

Are you saying that you believe that NN4.x and IE4.x are the only
browsers potentially being used that don't support try/catch? try/catch
is error prone on the web.

> It adds no more error-proneness here because -- surprise, surprise! -- the
> current JSON parser implementation in J(ava)Script already uses `throw' to
> throw the aforementioned exception:

That doesn't make try/catch/throw any less error prone.

Signature

Randy
Chance Favors The Prepared Mind
comp.lang.javascript FAQ - http://jibbering.com/faq/index.html
Javascript Best Practices - http://www.JavascriptToolbox.com/bestpractices/

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