Hi,
as you already noticed widgets are rendered in a different context from the
page templates, widgets templates are usually not meant for doing much
computation. You should prepare everything you need inside the template
inside the "prepare" method of the widget.
In your case you HomeBarMenu would be something like:
*class HomeMenuBar (JBar):*
* template = ' ... '*
*
*
* def prepare(self):*
* super(**HomeMenuBar, self).prepare()*
* self.user_logged = tg.request.identity is not None*
* self.urls = {'about': tg.url('/about'),
'logout':tg.url('/logout_handler')}*
*
*
*and so on... Then it will be possible to access the variables inside the
template as w.user_logged and w.urls*
On Fri, May 3, 2013 at 9:27 PM, Shane <[email protected]> wrote:
> Moritz,
>
> Didn't know about the lurl(), but I don't think that is the root of the
> problem. I don't have access to any of the tg namespace. The problem
> seems to be in widget.display(). I can pull up a shell, make a
> *jbar=HomeMenuBar('home_dom_id'))
> *object but calling jbar.display() (or jbar.render()) throws the same
> "request" or "tg" not defined error.
>
> It seems like the template code for widgets is being evaluated separately
> from that of the master.html template (which makes sense), I just don't
> know how to import tg or request (or other TG modules) into a widget's
> namespace.
>
> Looking through the various widget templates, I haven't seen examples of
> tg or other namespaces being used. Perhaps I am going about this the wrong
> way?
>
> - Shane
>
> On Friday, May 3, 2013 1:46:45 AM UTC-5, Moritz Schlarb wrote:
>>
>> Use the lazy variant that gets evaluated as late as possible:
>> tg.lurl()
>>
>> Am Freitag, 3. Mai 2013 07:16:55 UTC+2 schrieb Shane:
>>>
>>> Hello,
>>>
>>> I am building a JBar menubar widget for a TG application. I was
>>> planning to build different menubars by subclassing a base JBar(Widget)
>>> class and modifying the template. The problem is that I need to use tg.url
>>> and request objects to modify the menu from the controller. When I call
>>> the display() method on my *HomeMenuBar*, I get:
>>>
>>> *UndefinedError: "request" not defined*
>>>
>>> So, I'm not getting access to request (or tg.url) in the environment of
>>> my widget template. How do I do this?
>>>
>>> To summarize what is happening (ToscaWidgets 0.9.12, TurboGears2 2.2.0):
>>>
>>> *class HomeMenuBar (JBar):*
>>> * template=('''*
>>> * <html xmlns="http://www.w3.org/1999/xhtml"*
>>> * xmlns:py="http://genshi.edgewall.org/"*
>>> * xmlns:xi="http://www.w3.org/2001/XInclude"*
>>> * py:attrs="attrs" *
>>> * py:strip="">*
>>> * *
>>> * <ul class="${menu_css}">*
>>> * <li><a py:if="request.identity"
>>> href="${tg.url('/about')}">About</a></li>
>>> *
>>> * <li><a py:if="request.identity" href='/pdf/User
>>> Manual.pdf'>Help</a></li>*
>>> * <li><a py:if="request.identity" id="login"
>>> class="loginlogout" href="${tg.url('/logout_handler')}">Logout</a></li>*
>>> * </ul>*
>>> * *
>>> * </html>*
>>> * ''')*
>>> *home_menu_bar=HomeMenuBar('home_menu')*
>>>
>>> I create the object once in my widgets.MenuBar.py and pass from the
>>> controller to another template in the tmpl_context:
>>>
>>> *@expose('MyApp.templates.TableView')*
>>> *@expose('json')*
>>> *def home (self, *args, **kw):*
>>> * ...*
>>> * tmpl_context.menu_bar=MenuBars.home_menu_bar*
>>> * return {}*
>>>
>>> In my *TableView.html *template, I include:
>>>
>>> *<xi:include href="master.html" />*
>>>
>>> which finally brings in the menu bar across the top of each page:
>>> ....
>>> *<div py:if="hasattr(tmpl_context, 'menu_bar')" id="menu_bar_container">
>>> *
>>> * ${tmpl_context.menu_bar.display()}*
>>> *</div>*
>>> ....
>>>
>>> I had previously passed a genshi method name from controller to template
>>> in order to accomplish the same task, but I wanted to put the menubar into
>>> a widget, as this allows more flexibility to modify the menu in the
>>> controller.
>>>
>>> Thank you,
>>>
>>> Shane
>>>
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