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Re: [XHR2] Blobs, names and FormData

From: Charles Pritchard <chuck@jumis.com>
Date: Tue, 30 Aug 2011 17:59:11 -0700
Message-ID: <4E5D875F.2090500@jumis.com>
To: Jonas Sicking <jonas@sicking.cc>
CC: public-webapps@w3.org
On 8/30/11 5:52 PM, Jonas Sicking wrote:
> On Tue, Aug 30, 2011 at 3:26 PM, Charles Pritchard<chuck@jumis.com>  wrote:
>    
>> On 8/24/2011 11:56 PM, Charles Pritchard wrote:
>>      
>>> On 8/24/11 11:36 PM, Jonas Sicking wrote:
>>>        
>>>> On Wed, Aug 24, 2011 at 12:57 PM, Charles Pritchard<chuck@jumis.com>
>>>>   wrote:
>>>>          
>>>>>>> Prpoposed:
>>>>>>>
>>>>>>> FormData output with the x-www-form-urlencoded mime type:
>>>>>>> formData.toUrlEncodedBlob(xhr.send)
>>>>>>>
>>>>>>>                
>>>>> [Supplemental] FormData
>>>>> void toMultipartBlob(in callback)
>>>>> void toUrlEncodedBlob(in callback)
>>>>>            
>> ...
>>      
>>> xhr.send(formData) would be the same as:
>>> formData.toMultipartBlob(function(blob) { xhr.send(blob); });
>>>
>>>        
>> Google's Picasa, and various other web apis accept multipart/related input.
>> Given that we don't want a method for each output type supported, I think a
>> generic method would better serve authors.
>>
>> [Supplemental] FormData
>>   void toBlob(in FileCallback, in optional DOMString type, in any... args);
>>
>> The default type for FormData would be multipart/form-data.
>> Vendors would be encouraged to support these, in addition:
>> application/x-www-form-urlencoded
>> multipart/related
>>      
> What is multipart/related? Is that something supported by browsers? It
> doesn't appear supported by gecko, and it's certainly not supported
> for form submission in Gecko.
>
>    
No, it's not supported by browser forms.

I'm trying to extend the FormData object, because it's a handy object 
for building up POST types used with XHR.
Since FormData supports Blob append, it'd be nice to support the various 
services that use types other than multipart/form-data.

Currently, FormData is all or nothing... so when interfacing with 
various web services, I have to go back to re-creating the mime message 
from scratch. Not a big deal, but it's frustrating to recreate the 
FormData interface over-and over again.

This could be easy, with an extended FormData:
http://code.google.com/apis/picasaweb/docs/2.0/developers_guide_protocol.html#PostPhotos

var n = new FormData(); n.append(blob)...; n.toBlob(function(message) { 
xhr.send(message); });
Received on Wednesday, 31 August 2011 00:59:35 GMT

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