Hi Carl and Gregor,
On 2 апр, 01:17, Carl Meyer <c...@oddbird.net> wrote:
>
> > 3. The designers I worked with are often interested on adding custom css
> > class
> > or an attribute to a form field. Most of the time this is really a pain
> > to
> > do if you don't have control over the python form code. Imagine a
> > reusable
> > app that ships with urls, views, forms. To add a single class you would
> > need to: (a) overwrite the predefined url because you want (b) to specify
> > an additional parameter for the view which is (c) your custom subclass of
> > the thirdparty form::
>
> > class ChangedAttributeForm(ThirdPartyForm):
> > field = forms.CharField(max_length=50,
> > widget=TextInput(attrs={'class': 'fancy-text-input'}))
>
> > btw: This also violates the DRY principle since you have to redefine the
> > used field type, it's attributes (like ``max_length=50``) and the widget.
>
> > I want to tell the designer how he can do this without my help in the
> > template.
>
> I agree with your Motivations section - in particular this final line,
> which sums up the core motivation as I see it.
>
This goal can be achieved without changing django, see
https://bitbucket.org/kmike/django-widget-tweaks
Each widget is instantiated by field in 'as_widget' method now, and
the field passes 'attrs' argument to widget with extra attributes.
The idea behind django-widget-tweaks is simple: it provides template
filters that take field instance and wrap its 'as_widget' bound method
so it receives extra attributes (and pass these extra attributes to
widget). This way widget attributes (including input types and css
classes) can be altered in templates without touching python, e.g.:
{{ myform.field|add_class:"fancy-text-input" }}
{{ search_form.query|attr:"type:search" }}
Implementation:
https://bitbucket.org/kmike/django-widget-tweaks/src/0e9bac3c71bd/widget_tweaks/templatetags/widget_tweaks.py
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