Re: [Zope] Pass objects from template to template via HTML forms.
[ Negroup - wrote:] 2005/7/5, Konstantin E. Steuck [EMAIL PROTECTED]: Negroup - wrote: [cut] Try looking into copy/cut/paste machinery, it seems to be what you're looking for This is a thing I absolutely want to avoid. I simply need to pass an object directly from one template to another, without intermediate steps (like, copying or creating the object with some manage_*method from a template, read the created object from the other template and then remove the object itself because unuseful..). In python it is so immediate: I pass objects between functions via parameters; in zope the most natural way to simulate parameters passing from one zpt and another is storing them inside the request object, and thus, using html forms. But for some reasons that I'm missing, it doesn't work! passing objects from one template to another via the REQUEST variable only works while you're in ONE request. otherwise you'll get a string representation as you mentioned. try using the session mechanism instead: http://www.plope.com/Books/2_7Edition/Sessions.stx regards, juergen herrmann ___ XLhost.de - eXperts in Linux hosting Juergen Herrmann Weiherweg 10, 93051 Regensburg, Germany Fon: +49 (0)700 XLHOSTDE [0700 95467833] Fax: +49 (0)721 151 463027 ICQ: 27139974 - IRC: [EMAIL PROTECTED] WEB: http://www.XLhost.de ___ XLhost.de - eXperts in Linux hosting Juergen Herrmann Weiherweg 10, 93051 Regensburg, Germany Fon: +49 (0)700 XLHOSTDE [0700 95467833] Fax: +49 (0)721 151 463027 ICQ: 27139974 - IRC: [EMAIL PROTECTED] WEB: http://www.XLhost.de ___ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev )
Re: [Zope] Pass objects from template to template via HTML forms.
Am Montag, den 04.07.2005, 22:53 +0200 schrieb Negroup -:
Is there some way to pass an object from template A to template B via
HTML forms?
A
form name=a action=b method=post
input type=hidden name=obj tal:attributes=value here /
input type=submit value=Press /
/form
B
b tal:content=structure here/REQUEST/b
Template B prints:
form
obj 'OrderedFolder instance at 42d9aec0'
I need the object itself, not the string representing the object!
You cannot simply pass a ZOPE object in a form like that.
You can handle fairly complex structures (lists and dictionaries
with int, float, string in them) but whole objects would
need to be pickled and then open a huge security hole
(Whatever is in the client can and will be faked)
So best option I see is to not pass the object but rather
pass the reference to the object. You can resolve
it via restrictedTraverse('/path/from/form')
Btw. avoid much code in the Template. Its a maintenance
headache. You can do it esily in a python script and
call this from template.
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Re: [Zope] Pass objects from template to template via HTML forms.
+---[ Negroup - ]--
| 2005/7/5, Tino Wildenhain [EMAIL PROTECTED]:
| [cut]
|
| So best option I see is to not pass the object but rather
| pass the reference to the object. You can resolve
| it via restrictedTraverse('/path/from/form')
|
| I think I can't apply your solution. restrictedTraverse asks for a
| path, and then it supposes that the object is stored inside ZODB. This
| is not my case. Let me provide a minimanl explaination about how my
| application is structured.
|
| 1. A user can uploads a zipped file via HTML form in upload_zip ZPT.
| The action of the form points to check_zip, an External Method that
| checks for validity of each file inside the archive.
|
| 2. check_zip returns to upload_zip a tuple containing two elements:
| True or False (based on the correctness of archive) and the object
| itself, via self parameter.
|
| 3. after the external method has been called, upload_zip shows other 2
| forms that the user will use to abort operation or to continue the
| process. The form to continue will pass the object to another external
| method in order to compute the result. This is the step where I
| encounter the problem, I can't pass object.
|
| This should explain why I haven't the object stored inside ZODB.
|
| Probably the solution would be to store the uploaded object inside a
| temporary area of ZODB and then I'll be able to do all the tasks I
| need.
|
| Any further consideration/hints?
You would be better off storing the file on the filesystem, and pass the
filename around. You'd have to do some sanity checking on the filename before
any manipulation obviously.
--
Andrew Milton
[EMAIL PROTECTED]
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Re: [Zope] Pass objects from template to template via HTML forms.
Am Dienstag, den 05.07.2005, 11:05 +0200 schrieb Negroup -:
2005/7/5, Tino Wildenhain [EMAIL PROTECTED]:
[cut]
So best option I see is to not pass the object but rather
pass the reference to the object. You can resolve
it via restrictedTraverse('/path/from/form')
I think I can't apply your solution. restrictedTraverse asks for a
path, and then it supposes that the object is stored inside ZODB. This
is not my case. Let me provide a minimanl explaination about how my
application is structured.
1. A user can uploads a zipped file via HTML form in upload_zip ZPT.
The action of the form points to check_zip, an External Method that
checks for validity of each file inside the archive.
2. check_zip returns to upload_zip a tuple containing two elements:
True or False (based on the correctness of archive) and the object
itself, via self parameter.
3. after the external method has been called, upload_zip shows other 2
forms that the user will use to abort operation or to continue the
process. The form to continue will pass the object to another external
method in order to compute the result. This is the step where I
encounter the problem, I can't pass object.
This should explain why I haven't the object stored inside ZODB.
Probably the solution would be to store the uploaded object inside a
temporary area of ZODB and then I'll be able to do all the tasks I
need.
Any further consideration/hints?
Well yes, thats very easy. Just store your (compressed or not)
HTML data (since its a string after all and not such a complex
object) in a hidden form field (base64 encoded for example) -
filedata=htmldata.encode(base64)
and the other parts of your form as you wish. Maybe you prepare
the data in a script and call the ZPT from it:
return context.yourZPT(filedata=filedata,somestatus=whatever)
and use: input type=hidden tal:attributes=value options/filedata
type=text / in your ZPT.
When the request returns, use: htmldata=filedata.decode(base64)
alternatively you can just store the data in REQUEST.SESSION
to keep it on server (but watch the memory usage)
--
Tino Wildenhain [EMAIL PROTECTED]
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Re: [Zope] Pass objects from template to template via HTML forms.
Negroup - wrote: This is a thing I absolutely want to avoid. I simply need to pass an object directly from one template to another, without intermediate steps (like, copying or creating the object with some manage_*method from a template, read the created object from the other template and then remove the object itself because unuseful..). Sure, you don't need to use copy/paste mechanism, just look on the implementation. AFAIR it just pickles list of absolute_url()'s and stores base64-encoded result into cookies. ___ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev )
Re: [Zope] Pass objects from template to template via HTML forms.
On 04.Jul 2005 - 22:53:58, Negroup - wrote: Is there some way to pass an object from template A to template B via HTML forms? A form name=a action=b method=post input type=hidden name=obj tal:attributes=value here / input type=submit value=Press / /form B b tal:content=structure here/REQUEST/b Template B prints: form obj 'OrderedFolder instance at 42d9aec0' I need the object itself, not the string representing the object! You do get the object itself when you access REQEUST['obj'], only in HTML you get something like the above, as that's what the string represenation of obj is. Andreas -- Try to relax and enjoy the crisis. -- Ashleigh Brilliant ___ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev )
Re: [Zope] Pass objects from template to template via HTML forms.
2005/7/4, Andreas Pakulat [EMAIL PROTECTED]: On 04.Jul 2005 - 22:53:58, Negroup - wrote: [cut] b tal:content=structure here/REQUEST/b [cut] You do get the object itself when you access REQEUST['obj'], only in HTML you get something like the above, as that's what the string represenation of obj is. Why then, if template b is: b tal:define=obj python:here.REQUEST['obj'].getId()/b (or b tal:define=obj python:here.REQUEST.form['obj'].getId()/b) zope gives this error? Error Type: AttributeError Error Value: 'str' object has no attribute 'getId' ___ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev )
Re: [Zope] Pass objects from template to template via HTML forms.
Negroup - wrote: Why then, if template b is: b tal:define=obj python:here.REQUEST['obj'].getId()/b (or b tal:define=obj python:here.REQUEST.form['obj'].getId()/b) zope gives this error? Because REQUEST.form['obj'] is already a string representation of then object, not object itself, hence it has not method getId() Try looking into copy/cut/paste machinery, it seems to be what you're looking for ___ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev )
