kangax wrote:
> On Feb 24, 8:43 am, Richard Quadling <[email protected]> wrote:
>> Hi.
>>
>> I'm using JSONP to pass data from the server to the client.
>>
>> Normally the call is like ...
>>
>> tabRA_UpdateReportIDs({"13":"Richard Quadling's demo report (Richard's
>> complicated report)"});
>>
>> A hash.
>>
>> In some instances, there is no data and the call looks like this ...
>>
>> tabRA_UpdateReportIDs([]);
>>
>> An array.
>>
>> As I understand things, this is not incorrect. I'm using PHP and I've
>> placed a request to allow for an option to force empty arrays to be an
>> empty hash for the json_encode() function. On the json_decode()
>> function, there is an option allowing the user to decide between an
>> object or an associative array (object or hash), so having a similar
>> option on the json_encode() side would, on the surface, seem useful.
>> (http://bugs.php.net/bug.php?id=47493)
>>
>> My point in contacting this group is to see if ...
>>
>> $H([])
>>
>> should work like ...
>>
>> $H({})
>>
>> If you run these commands in console you get quite different output ...
>>
>> $H({}).each(function(h){console.debug(h);});
>>
>> vs ..
>>
>> $H([]).each(function(h){console.debug(h);});
>
> `$H([])` produces something that it was never intended to produce - an
> object extended with Array.prototype.* methods. You probably don't
> ever want to use it.
>
It's not that Richard does want to use it. It's that the PHP
json_encode() function produces inconsistent output for empty arrays.
If you do
json_encode(array('key' => 'value');
you will get:
{ key: value };
but
json_encode(array());
returns:
[];
So it is possible, that the PHP backend returns unexpectedly empty
array instead of object. The problem clearly is on the PHP side, and
Richard propsed a patch for this issue.
Anyway, until this is fixed, and until PHP is updated on the servers
used by prototype users, a workaround is *needed*.
I think we should propose a pattern which would be used to avoid this
behaviour.
Do you have an idea how to reliably avoid that?
I think in most cases:
var _a=[];
_a = (Object.isArray(_a) && !_a.length) ? {} : _a;
var hash = $H(_a);
...would be sufficient, as not empty arrays should not be passed to
$H(). What do you think?
--
Regards,
SWilk
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