John Fabiani wrote:
> On Monday, August 16, 2010 11:12:46 am Jim Byrnes wrote:
>> John Fabiani wrote:
>>> On Monday, August 16, 2010 09:58:34 am Jim Byrnes wrote:
>>>> John Fabiani wrote:
>>>>> On Monday, August 16, 2010 08:44:59 am Jim Byrnes wrote:
>>>>>> I am starting my first Dabo app. I am putting some info from a Sqlite
>>>>>> database in a dDropdownList. Then I need to populate some other
>>>>>> controls based on the item selected in the dDropdownList.
>>>>>>
>>>>>> Before I proceeded I wanted to make sure I knew how to get the value
>>>>>> from the dDropdownList so wrote a little test:
>>>>>>
>>>>>> ## *!* ## Dabo Code ID: dDropdownList-dPanel
>>>>>>
>>>>>> def onHit(self, evt):
>>>>>> item = self.Form.PwordsCategories.Value
>>>>>> print item
>>>>>>
>>>>>> When I run it I get this:
>>>>>>
>>>>>> Dabo Error Log: Mon Aug 16 10:25:40 2010: Could not bind to
>>>>>> 'categories.Catgegory'
>>>>>> Reason: 'NoneType' object has no attribute 'Catgegory'
>>>>>> WebSites
>>>>>>
>>>>>> OK, WebSites is what I was expecting but what did I do wrong to
>>>>>> generate the Dabo error?
>>>>>>
>>>>>> dDropdownList RegID = PwordsCategories
>>>>>> DataField = Category
>>>>>> DataSource = categories
>>>>>>
>>>>>> Here is the afterInitAll if that's helpful:
>>>>>>
>>>>>> def afterInitAll(self):
>>>>>> pwordsBiz = self.getBizobj('pwds')
>>>>>> categories = pwordsBiz.getCategories()
>>>>>> self.PwordsCategories.Choices = categories
>>>>>> self.PwordsCategories.ValueMode = 'string'
>>>>>>
>>>>>> self.requery()
>>>>>>
>>>>>> Thanks, Jim
>>>>>
>>>>> Maybe a mis-spellling:-)
>>>>>
>>>>> 'Catgegory'<> 'Category'
>>>>>
>>>>> Johnf
>>>>
>>>> Thanks for catching that. Getting old I guess, but after I correct that
>>>> and save/run it I get the same results, but Category in the error
>>>> message is spelled correctly now.
>>>>
>>>> Thanks, Jim
>>>
>>> Maybe you are also setting up the values in the wrong method? I think it
>>> should be afterInit(). I should have noticed that earlier. Also you may
>>> have to account for the 'None' value in the list if the requery does not
>>> return anything.
>>>
>>>
>>>
>>> Johnf
>>
>> I commented out the afterInitAll method and put the code:
>>
>> pwordsBiz = self.getBizobj('pwds')
>> categories = pwordsBiz.getCategories()
>> self.PwordsCategories.Choices = categories
>> self.PwordsCategories.ValueMode = 'string'
>>
>> self.requery()
>>
>> in the afterInit method but that seemed to make it worse. Nothing from
>> the dDropdownList was printed and I got a long traceback ending with:
>>
>> File "/tmp/tmpBai5Sx.py", line 260, in afterInit
>> self.PwordsCategories.Choices = categories
>> AttributeError: 'dForm_62236' object has no attribute 'PwordsCategories'
You were correct, it should be the afterInit. Another mistake on my
part. I had the code in the afterInit in the dForm section of the code
not the dDropdownList section. Once I fixed that it ran and produced
the correct output but the error message was the same.
>> What is this line from the original error message (after correcting the
>> spelling of Category) telling me:
>>
>> Reason: 'NoneType' object has no attribute 'Category'
>>
>> I've Goolged that before but never really found a explanation I could
>> understand.
>>
>>
>> I'm not sure what you mean about accounting for the 'None' value.
>> However, a value is always returned when I select an item from the
>> dDropdownList.
>>
>> Thanks, Jim
>
> OK Jim,
> Let's start over!
>
> You need to have a control somewhere on the form. Something like this will
> work.
>
> #/usr/bin/env python
> import wx
> import dabo
> dabo.settings.dateFormat ="%m/%d/%Y"
>
> import dabo.dEvents as dEvents
> import dabo.dException as dException
>
>
>
> dabo.ui.loadUI('wx')
> from dabo.ui import dKeys as dKeys
>
> class MainForm(dabo.ui.dForm):
>
>
> def afterInit(self):
> """Normally the programmer would add code to display the controls
> here. The programmer could add panels that contain other controls etc. """
> self.Caption = "Replace with a Window Title"
> self.Sizer = vs = dabo.ui.dSizer('v')
>
> choices = self.getPwordsChoices()
>
> vs.append(dabo.ui.dDropdownList(self, RegID= 'PwordsCategories',
> Choices = choices))
>
>
> def getPwordsChoices(self):
> mylist_of_values = ['<None>',]
> for val in ['website', 'desktop', 'iphone']:
> mylist_of_values.append(val)
>
> return mylist_of_values
>
>
> if __name__ == "__main__":
> app = dabo.dApp()
> app.MainFormClass = MainForm
> app.start()
As I expected yours runs without error. Looking at your code I see it
is self contained, ie all in one file. I'm using the ClassDesigner so I
have multiple files in Dabo's standard structure. This must be where I
am doing something wrong to produce that <NoneType> error.
>
> In this case I have hard coded the value of the dropdown but you of course
> would use the values in your table. I have also added the '<None>' value to
> the list of available values. This because if you have not selected a record
> at the time you open the form it will error out on the '<None>' value not
> being in the list.
>
Thanks for the explanation and I have added that to mine.
> Most of the time the "NoneType" is saying the the object does not exist. I
> think it applies to your error message.
OK, is there anyway to determine what object it is looking for?
> If you are using the ClassDesigner I would do the following to play and learn
> a little more.
>
> I would add the dropdown to the form. Fillin the choices properties. Run the
> form. Use the dShell (control-d to open) and try accessing the value. by
> typing the following (the same is true with my form:
>
> self.RegID.Value #change the RegID to match what you used in RegID
>
If I do this from dShell Value is correct and no error message is
displayed. If I run my program Value is correct but the error message
appears.
The maddening thing about this is I based my code on the Pycon tutorial
I completed and which runs fine. I have opened the corresponding files
side by side in my editor and still can't see where I went wrong.
Thanks for your efforts, Jim
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