Which web2py version? I believe this was fixed in 2.2 or 2.3.
Massimo
On Thursday, 13 December 2012 11:55:34 UTC-6, Andy Salnikov wrote:
>
> Hi,
>
> I have an issue with the upload form and postbacks. In my application I
> need to validate file contents before accepting it from user upload form,
> so naturally I try to use "onvalidation" method to it. The table used in
> the forma is defined like this:
>
> db.define_table('input_data',
> Field('input_file', 'upload', autodelete=True,
> requires=IS_NOT_EMPTY(), label=T('Input file')),
> Field('output_type', default="xxx",
> requires=IS_IN_SET(['xxx', 'yyy']), label=T('Output format')),
> Field('original_name', writable=False, readable=False),
> Field('created', 'datetime', writable=False,
> readable=False),
> )
>
> My simplified action looks like this:
>
> def _validateFileForm(form):
> try:
> validator.validate(form.vars.input_file.file)
> # on success set hidden fields
> form.vars.original_name = request.vars.input_file.filename
> form.vars.created = datetime.datetime.now()
> except Exception, ex:
> # if validation fails then display an error
> form.errors.input_file = T('file_validation_failed') + ': ' +
> str(ex)
>
> def index():
>
> form = SQLFORM(db.input_data, submit_button=T("Upload"))
> if form.process(onvalidation=_validateFileForm).accepted:
> # save file id in a session and go to options page
> session.input_data_id = form.vars.id
> redirect(URL(options_odt))
>
> return dict(form=form)
>
> Validation seems to work OK, if file is OK then everything is redirected
> to next page, if file is bad then message is displayed in red under file
> upload field.
>
> What is interesting about it is that when validation fails and form is
> re-displayed it also looks like that the whole file contents is send back
> to the client together with the form. For large uploaded file this could be
> a lot of data. I see long delays and when I check the HTTP response headers
> I see many-megabytes number there. Is there a way to avoid sending the file
> contents back with the form during a postback?
>
> Thanks,
> Andy
>
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