Mystery of the Misbehaving form

casibbald

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Dec 30, 2009, 4:56:45 PM12/30/09

to TurboGears

Hi All,

I have something strange going on with my forms, they seem to
misbehave and i don't know if its my code, or something with forms.

The strange thing is, if i get Turbogears to reload anything by adding
a comment to a file, i can visit the page and the form works again.
but the forms vanish again.

The following is a form rendered correctly:
http://prontoapps.com/images/formItemShowing.png

The following is the form if the page is refreshed, or visited from
another browser tab/machine:
http://prontoapps.com/images/formItemsVanish.png

The application does not have a DB, and is designed to manipulate
files on the filesystem.

Looking forward to someone shedding light on this.

Regards

Charles

======

The following is the root controller:
=================
# -*- coding: utf-8 -*-
"""Main Controller"""

from tg import expose, flash, require, url, request, redirect
from pylons.i18n import ugettext as _, lazy_ugettext as l_
from tg import tmpl_context, redirect, validate

from webdeploy.lib.base import BaseController
from webdeploy.model import DBSession, metadata
from webdeploy.controllers.error import ErrorController
from webdeploy.lib.mylibs import getMywebInstalledVersions as
getVersions
from webdeploy.lib.mylibs import checkIfRunning as checkIfRunning

from webdeploy.lib.applicationControlForm import
create_applicationControlForm

import os

__all__ = ['RootController']

class RootController(BaseController):
"""
The root controller for the webdeploy application.

All the other controllers and WSGI applications should be mounted
on this
controller. For example::

panel = ControlPanelController()
another_app = AnotherWSGIApplication()

Keep in mind that WSGI applications shouldn't be mounted directly:
They
must be wrapped around
with :class:`tg.controllers.WSGIAppController`.

"""

error = ErrorController()

@expose('webdeploy.templates.index')
def index(self):
"""Handle the front-page."""
myweb_home = os.getenv("MYWEB_HOME")
return dict(page='index', versions=getVersions(myweb_home),
appStatus=checkIfRunning())

@expose('webdeploy.templates.applicationControl')
def applicationControl(self, **kw):
"""Handle the 'applicationControl' page."""
tmpl_context.form = create_applicationControlForm
return dict(page='applicationControl',
control_options='controlApplicationOptions',
control_actions='controlAction')

@validate(create_applicationControlForm)
@expose()
def executeForm(self, **kw):
"""Handle the 'applicationControl' page."""
tmpl_context.form = create_applicationControlForm
redirect("index")

The following is my form code:
============
# -*- coding: utf-8 -*-

from tw.api import WidgetsList
from tw.forms import TableForm, SingleSelectField, TextField,
TextArea, Spacer, Label
from tw.forms.validators import Int, NotEmpty, DateConverter
from webdeploy.lib.mylibs import getExecutables as getExecutables

class applicationControlForm(TableForm):

class fields(WidgetsList):
installDict = getExecutables()
applicationList = []
hover_help = True
for each in installDict:
if each == "DMT" :
pass
else :
applicationList.append(each)
controlApplicationOptions = enumerate((applicationList))
controlApplication = SingleSelectField('Application',
options=controlApplicationOptions, help_text = 'Please select the
Application to control.')

controlActionOptions = enumerate(('start', 'stop'))
controlAction = SingleSelectField
(options=controlActionOptions)

create_applicationControlForm = applicationControlForm
("create_applicationControlForm", action='executeForm')

================
Environment info:
# paster --versionPasteScript 1.7.3 from /home/nowplus/apps/mywebapp/
lib/python2.6/site-packages/PasteScript-1.7.3-py2.6.egg (python 2.6.2
(r262:71600, Aug 11 2009, 07:00:48))

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========================================

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Diez B. Roggisch

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Dec 31, 2009, 1:13:18 PM12/31/09

to turbo...@googlegroups.com

casibbald schrieb:

> Hi All,
>
> I have something strange going on with my forms, they seem to
> misbehave and i don't know if its my code, or something with forms.
>
> The strange thing is, if i get Turbogears to reload anything by adding
> a comment to a file, i can visit the page and the form works again.
> but the forms vanish again.
>
> The following is a form rendered correctly:
> http://prontoapps.com/images/formItemShowing.png
>
> The following is the form if the page is refreshed, or visited from
> another browser tab/machine:
> http://prontoapps.com/images/formItemsVanish.png
>
> The application does not have a DB, and is designed to manipulate
> files on the filesystem.
>
> Looking forward to someone shedding light on this.

You want your @validate-decorator have the applicationControl-action as
error_handler.

Diez

casibbald

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Jan 1, 2010, 7:26:13 AM1/1/10

to TurboGears

Hi Diez,

Thanks for your response.

I have updated as below, but still have the same problem. Could there
be another parameter missing?

@expose('webdeploy.templates.applicationControl')
def applicationControl(self, **kw):
"""Handle the 'applicationControl' page."""
tmpl_context.form = create_applicationControlForm
return dict(page='applicationControl',
control_options='controlApplicationOptions',
control_actions='controlAction')

@validate(create_applicationControlForm,
error_handler=applicationControl)

@expose()
def executeForm(self, **kw):
"""Handle the 'applicationControl' page."""
tmpl_context.form = create_applicationControlForm
redirect("index")

Regards

Charles

Diez B. Roggisch

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Jan 1, 2010, 8:10:10 AM1/1/10

to turbo...@googlegroups.com

casibbald schrieb:

This looks fishy. Why do you pass strings as control_options and
control_actions? And how do you invoke the form in the template, so far
I've not seen that.

Diez

casibbald

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Jan 2, 2010, 7:16:59 AM1/2/10

to TurboGears

Hi Diez,

This is the applicationControl.html template.

============
<body>

<div id="getting_started">
<h2>The following allows you to start and stop Component
Applications</h2>

<div py:replace="tmpl_context.form()">Input Form</div>

</div>

==============

control_options = is the start and stop select field.

control_applications = is the list of applications.

I am happy to share the whole lot of code with you, if you don't mind.

casibbald

unread,

Jan 2, 2010, 1:21:23 PM1/2/10

to TurboGears

Updated as follows, based on Diez's instructions.

===============

Quote: Diez

"the problem is your usage of enumerate as option-list constructor.
This is a *generator* object. Thus after the initial display of the
form, it's exhausted.

I didn't notice that before, even though your shown code-samples in
the ML had that error. I guess that's because your code is pretty
convoluted - mixing form-declaration & creation of these lists into
the class-scope is a bit on the wierd side IMHO.

All you need to do is to wrap the generator into a list:"

===============

class applicationControlForm(TableForm):

class fields(WidgetsList):
installDict = getExecutables()
applicationList = []
hover_help = True
for each in installDict:
if each == "DMT" :
pass
else :
applicationList.append(each)

controlApplicationOptions = list(enumerate((applicationList)))

controlApplication = SingleSelectField('Application',
options=controlApplicationOptions, \
help_text = 'Please
select the Application to control.')

controlActionOptions = list(enumerate(('start', 'stop')))
controlAction = SingleSelectField
(options=controlActionOptions)
submit_text = 'Save Movie'

create_applicationControlForm = applicationControlForm
("create_applicationControlForm", action='executeForm')