Hi!
I've been talking to Roger about a problem I was having with some
AJAX things to allow editing a complex form I'm creating for an
application.
The thing that was causing me more problems was filling fields that
depend on previous values to get their own values, a kind of cascade of
options. This happens when I'm editing existing records and I need to
display data to my users.
I tried to populate those with known values before displaying the form,
to avoid unneeded roundtrips from the client's machine to the server to
get values that I know that should be on the form.
What I did was:
================================================================================
In [1]: import model
In [2]: from clientes.controllers.contatos import Contatos
In [3]: from neobh.controllers.tecnico.formularios import
formulario_planilha_dados
In [4]: from clientes.controllers.formularios import clientes
In [5]: fpd =
formulario_planilha_dados(template="neobh.templates.planilha_dados_template")
In [6]: fpd.render()
Out[6]: '<div>\n <form method="post" name="planilhas_dados">\n <input
class="hiddenfield" type="hidden" id="id" name="id">\n <p>\n <label
class="fieldlabel" for="tipoServico">\n Tipo de Servi\xc3\xa7o\n
</label>\n <ul class="checkboxlist" id="tipoServico">\n <li>\n
<input type="checkbox" name="tipoServico" value="18"
id="tipoServico_18">\n <label for="tipoServico_18">Auditor (Follow
up) - GMB</label>\n </li><li>\n <input type="checkbox"
name="tipoServico" value="5" id="tipoServico_5">\n
(...)
In [7]: clientes()
Out[7]:
[[60, u'AAM'],
[88, u'Abc Group'],
[55, u'Alcoa Alum\xednios'],
[11, u'Alusur Fundi\xe7\xe3o'],
[134, u'A. Pedro Ind. Metal\xfargica '],
[84, u'Arniflex Artigos de Borracha'],
(...)
In [8]: Contatos.get_contatos(1)
Out[8]:
{'contatos': [(52, u'Ant\xf4nio Gimenes Jr.'),
(54, u'Rog\xe9rio Milleo Pitella'),
(59, u'Eduardo Sousa'),
(58, u'Sebasti\xe3o E.Martins B. Jr.'),
(128, u'Amauri')]}
================================================================================
But then, when I change one field's options the form stops rendering:
================================================================================
In [9]: fpd.get_field_by_name('contatoClienteBeneficiado')
Out[9]: SingleSelectFieldAddSubModal(name='contatoClienteBeneficiado',
convert=False, target=None, width=810,
text=<turbogears.i18n.tg_gettext.lazystring object at 0xa01616c>, height=510,
callback="function () {signal('planilhas_dados_clienteBeneficiado',
'onchange');}", link='/clientes/contatos/add/', attrs={}, css_classes=[],
field_class='singleselectfieldaddsubmodal', options=[])
================================================================================
What I needed here was some mean to replace the empty list of options
with a real list of options that is valid in this context.
I can replace the options using AJAX, but this would add the undesirable
roundtrip plus some other logic that I'd like to avoid if I can.
(Specially on setting the selected option...)
I've tried this:
================================================================================
In [10]: fpd.get_field_by_name('contatoClienteBeneficiado').options[:]=[]
In [11]:
fpd.get_field_by_name('contatoClienteBeneficiado').options.append(Contatos.get_contatos(1))
================================================================================
Rendering the form I get the following traceback:
================================================================================
File
'/home/godoy/empresa/clientes/bhquality/NeoBH/trunk/Neo-BH/neobh/templates/planilhas_dados.html',
line 25 in <Expression u"ET(formulario_planilha_dados(planilha_dados,
action="/tecnico/planilhas_dados/update/",
method="post"))">
<span py:replace="ET(formulario_planilha_dados(planilha_dados,
File
'/home/godoy/desenvolvimento/python/TurboGears/1.0/turbogears/widgets/base.py',
line 226 in __call__
return self.display(*args, **params)
File
'/home/godoy/desenvolvimento/python/TurboGears/1.0/turbogears/widgets/base.py',
line 352 in display
return super(CompoundWidget, self).display(value, **params)
File
'/home/godoy/desenvolvimento/python/TurboGears/1.0/turbogears/widgets/forms.py',
line 51 in _update_path
returnval = func(self, *args, **kw)
File
'/home/godoy/desenvolvimento/python/TurboGears/1.0/turbogears/widgets/forms.py',
line 236 in display
return super(InputWidget, self).display(value, **params)
File
'/home/godoy/desenvolvimento/python/TurboGears/1.0/turbogears/widgets/base.py',
line 264 in display
return view.engines.get('kid').transform(params, self.template_c)
File
'/usr/local/lib/python2.5/site-packages/TurboKid-0.9.9-py2.5.egg/turbokid/kidsupport.py',
line 191 in transform
return ElementStream(t.transform()).expand()
File
'/usr/local/lib/python2.5/site-packages/kid-0.9.5-py2.5.egg/kid/parser.py',
line 106 in expand
for ev, item in self._iter:
File
'/usr/local/lib/python2.5/site-packages/kid-0.9.5-py2.5.egg/kid/parser.py',
line 177 in _track
for p in stream:
File
'/usr/local/lib/python2.5/site-packages/kid-0.9.5-py2.5.egg/kid/parser.py',
line 177 in _track
for p in stream:
File
'/usr/local/lib/python2.5/site-packages/kid-0.9.5-py2.5.egg/kid/filter.py',
line 24 in apply_matches
for ev, item in stream:
File
'/usr/local/lib/python2.5/site-packages/kid-0.9.5-py2.5.egg/kid/parser.py',
line 177 in _track
for p in stream:
File
'/usr/local/lib/python2.5/site-packages/kid-0.9.5-py2.5.egg/kid/parser.py',
line 219 in _coalesce
for ev, item in stream:
File
'/home/godoy/empresa/clientes/bhquality/NeoBH/trunk/Neo-BH/neobh/templates/planilha_dados_template.py',
line 175 in _pull
File
'/home/godoy/desenvolvimento/python/TurboGears/1.0/turbogears/widgets/forms.py',
line 543 in <lambda>
**d["params_for"](f))
File
'/home/godoy/desenvolvimento/python/TurboGears/1.0/turbogears/widgets/forms.py',
line 51 in _update_path
returnval = func(self, *args, **kw)
File
'/home/godoy/desenvolvimento/python/TurboGears/1.0/turbogears/widgets/forms.py',
line 470 in _retrieve_field_for
returnval = func(self, field, *args, **kw)
File
'/home/godoy/desenvolvimento/python/TurboGears/1.0/turbogears/widgets/forms.py',
line 523 in display_field_for
return item.display(value, **params)
File
'/home/godoy/desenvolvimento/python/TurboGears/1.0/turbogears/widgets/forms.py',
line 51 in _update_path
returnval = func(self, *args, **kw)
File
'/home/godoy/desenvolvimento/python/TurboGears/1.0/turbogears/widgets/forms.py',
line 236 in display
return super(InputWidget, self).display(value, **params)
File
'/home/godoy/desenvolvimento/python/TurboGears/1.0/turbogears/widgets/base.py',
line 261 in display
self.update_params(params)
File
'/home/godoy/desenvolvimento/python/TurboGears/1.0/turbogears/widgets/forms.py',
line 908 in update_params
optlist[i] = (option[0], option[1], option_attrs)
UnboundLocalError: ("local variable 'option_attrs' referenced before
assignment", <bound method PlanilhasDados.edit of
<neobh.controllers.tecnico.planilhas_dados.PlanilhasDados object at 0x9f3a96c>>)
================================================================================
With the WSGI inspector I can see the following at the traceback point:
================================================================================
d {'attrs': {}, 'callback': "function ()
{signal('planilhas_dados_clienteBeneficiado', 'onchange...');}", 'convert':
False, 'css_classes': [], 'error': None, 'field_class':
'singleselectfieldaddsubmodal requiredfield', 'field_id':
'planilhas_dados_contatoClienteBeneficiado', 'height': 510, 'help_text': None,
'label': <turbogears.i18n.tg_gettext.lazystring object at 0x9ea074c>, 'link':
'/clientes/contatos/add/', 'name': 'contatoClienteBeneficiado', 'options':
[[(52, u'Ant\xf4nio Gimenes Jr.'), (54, u'Rog\xe9rio Milleo Pitella'), (59,
u'Eduardo Sousa'), (58, u'Sebasti\xe3o E.Martins B. Jr.'), (128, u'Amauri')]],
'target': None, 'text': <turbogears.i18n.tg_gettext.lazystring object at
0x9ea068c>, 'value': 54, 'width': 810}
group False
grouped_options []
i 0
optgroup [(52, u'Ant\xf4nio Gimenes Jr.'), (54, u'Rog\xe9rio Milleo
Pitella'), (59, u'Eduardo Sousa'), (58..., u'Sebasti\xe3o E.Martins B. Jr.'),
(128, u'Amauri')]
option [(52, u'Ant\xf4nio Gimenes Jr.'), (54, u'Rog\xe9rio Milleo Pitella'),
(59, u'Eduardo Sousa'), (58..., u'Sebasti\xe3o E.Martins B. Jr.'), (128,
u'Amauri')]
options []
optlist [[(52, u'Ant\xf4nio Gimenes Jr.'), (54, u'Rog\xe9rio Milleo Pitella'),
(59, u'Eduardo Sousa'), ... (58, u'Sebasti\xe3o E.Martins B. Jr.'), (128,
u'Amauri')]]
self SingleSelectFieldAddSubModal(name='contatoClienteBeneficiado',
convert=False, target=None, width=810...,
text=<turbogears.i18n.tg_gettext.lazystring object at 0x9ea068c>, height=510,
callback="function () {signal('planilhas_dados_clienteBeneficiado',
'onchange');}", link='/clientes/contatos/add/', attrs={}, css_classes=[],
field_class='singleselectfieldaddsubmodal', options=[[(52, u'Ant\xf4nio Gimenes
Jr.'), (54, u'Rog\xe9rio Milleo Pitella'), (59, u'Eduardo Sousa'), (58,
u'Sebasti\xe3o E.Martins B. Jr.'), (128, u'Amauri')]])
self SingleSelectFieldAddSubModal(name='contatoClienteBeneficiado',
convert=False, target=None, width=810...,
text=<turbogears.i18n.tg_gettext.lazystring object at 0x9ea068c>, height=510,
callback="function () {signal('planilhas_dados_clienteBeneficiado',
'onchange');}", link='/clientes/contatos/add/', attrs={}, css_classes=[],
field_class='singleselectfieldaddsubmodal', options=[[(52, u'Ant\xf4nio Gimenes
Jr.'), (54, u'Rog\xe9rio Milleo Pitella'), (59, u'Eduardo Sousa'), (58,
u'Sebasti\xe3o E.Martins B. Jr.'), (128, u'Amauri')]])
>> optlist[i] = (option[0], option[1], option_attrs)
UnboundLocalError: ("local variable 'option_attrs' referenced before
assignment", <bound method PlanilhasDados.edit of
<neobh.controllers.tecnico.planilhas_dados.PlanilhasDados object at 0x9f3a96c>>)
================================================================================
This works on IPython and fails on my browser... If I stop changing
options like this then the form renders perfectly.
Is it really not allowed? Is it possible to do what I want? If so, any
hints on how could I achieve that?
--
Jorge Godoy <[EMAIL PROTECTED]>
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