I did face this issue once. I think the issue is with upload.js in 
tapestry-upload.js

Tapestry.Initializer.injectedUpload = function(element)
{
    var form = $(element).form;

    form.enctype = "multipart/form-data";
    form.encoding = "multipart/form-data";
}

$(element).form returns null for partial updates. 

regards
Taha

On Apr 11, 2012, at 5:46 PM, François Facon wrote:

> Hi Boris,
> 
> AjaxUpload works fine with christian sample
> https://github.com/got5/tapestry5-jquery/blob/master/src/test/resources/org/got5/tapestry5/jquery/pages/AjaxUploadTest.tml
> on jetty
> 
> Could you give us more details regarding your dependencies
> - tapestry-upload,
> - commons-fileupload
> - tapestry-jquery
> are you using jetty?
> 
> also extract from your .tml and .java are welcome.
> 
> Regards
> 
> 
> 
> 2012/4/11 bhorvat <horvat.z.bo...@gmail.com>:
>> Hi all,
>> 
>> I have already wrote about a similar thing but did get any ideas how to
>> solve it then (and at the point it was a minor thing I had a bigger
>> problem).
>> 
>> I have a zone and inside I have a image upload, when the zone is refreshed
>> an image upload throws an exception
>> 
>> TypeError: Cannot set property 'enctype' of undefined
>> [http://localhost:8080/assets/0.55-SNAPSHOT/jquery/tapestry-jquery.js:904]
>> 
>> Anyone has any idea how to fix this or how to handle the exception since it
>> is preventing javascript from working? I dont know how to catch and handle
>> this exception, natrualy I would prefer to fix the problem in the first
>> place.
>> 
>> So did anyone came across this? Any ideas?
>> 
>> cheers and thanks all
>> 
>> --
>> View this message in context: 
>> http://tapestry.1045711.n5.nabble.com/Zone-refresh-image-uplaod-tp5631622p5631622.html
>> Sent from the Tapestry - User mailing list archive at Nabble.com.
>> 
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