[Qgis-user] QGIS - value relation widget

[Luca Lanteri]

Great Matthias,

I remove all global variables and now it work fine !

It remain just one problem, I add some code [0] connected with a button to
insert a filename in a field.
If use the button from single form all works fine but when I use it in from
the parent-child form the code start  lot of times (it seems one time for
every record in the table).

[0]
def apriFile(QLine):
    fileName=QLine.text()
    try:
        if os.path.isfile(fileName):

                os.startfile(fileName)
        else:
                msgBox = QMessageBox()
                msgBox.setText("Il file non esiste.")
                msgBox.exec_()
    except:
        msgBox = QMessageBox()
        msgBox.setText("Non riesco ad aprire il file.")
        msgBox.exec_()

Thanks a lot and let me know how to send your beer.
;-)


2015-10-02 9:24 GMT+02:00 Matthias Kuhn <matthias at opengis.ch>:

> Hi Luca
>
> Would this core functionality of QGIS be an option for you?
>
>
> https://www.qgis.org/en/site/forusers/visualchangelog210/index.html#feature-filter-chaining-for-relation-reference-widget
>
> If you are still required to use python in your forms: are you using
> global variables? They can be an issue for embedded forms.
>
> Cheers,
> Matthias
>
>
> On 10/02/2015 09:09 AM, Luca Lanteri wrote:
>
> Sadly, after further test I discover that the crashes remain, so I think
> it is a qgis bug and not a problem in my code.
> The problem happens when I put my custom form into a subform widget
> (QgsRelationEditorWidget). If I add a new record in the subform and I move
> to another record using the left column QGIS crashes. It seems to be a more
> general problem because the crash appears also when I add some simple
> control that modify the object in the form.
>
> I can open a ticket and add some test data.
> If it is a minor bug and it could be resolved easily I really offer a
> pizza and a beer to resolve it.
>
> All the best
> Luca
>
>
> 2015-10-01 23:53 GMT+02:00 Luca Lanteri <mescal72 at gmail.com>:
>
>> Hi,
>>
>> now I'm already using the python logic but my code is terrible and I have
>> a lot of crash problem.
>> Now that I using your example all is easier and seem to worsk fine.
>>
>> I owe you one beer.
>> Many many tanks !
>>
>> Luca
>>
>>
>> 2015-10-01 22:23 GMT+02:00 Blumentrath, Stefan <
>> <Stefan.Blumentrath at nina.no>Stefan.Blumentrath at nina.no>:
>>
>>> Hi Luca,
>>>
>>>
>>>
>>> Sounds like a case for Python logic!
>>>
>>> General principles are explained here:
>>>
>>>
>>> http://nathanw.net/2011/09/05/qgis-tips-custom-feature-forms-with-python-logic/
>>>
>>>
>>>
>>> Also nice, and probably exactly what you are looking for:
>>>
>>> http://medspx.fr/blog/Qgis/cascade_forms/
>>>
>>>
>>>
>>> Cheers
>>>
>>> Stefan
>>>
>>>
>>>
>>> *From:* qgis-user-bounces at lists.osgeo.org [mailto:
>>> qgis-user-bounces at lists.osgeo.org] *On Behalf Of *Luca Lanteri
>>> *Sent:* 1. oktober 2015 22:07
>>> *To:* qgis-user < <Qgis-user at lists.osgeo.org>Qgis-user at lists.osgeo.org>
>>> *Subject:* [Qgis-user] QGIS - value relation widget
>>>
>>>
>>>
>>> Hi to all,
>>>
>>> I need to build a form when the value of a combo are filtered basing on
>>> the value of anoter combobox.
>>> I have a first combo where I choose the region and a second with the
>>> municipalities.
>>> I need that the second combo shows only the municipalities of the
>>> choosed region.
>>> I tried to use use the widget "relationship value" with the a filter
>>> like classe_munic = attribute($currentfeature, 'classe_munic') without any
>>> success.
>>>
>>> Has anyone ever done something similar?
>>> Thank in advance
>>>
>>>
>>> Luca
>>>
>>
>>
>
>
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