Thanks Michael for your reply.
What I need is to present money values to end users online. If the
values are less than zero, then I need to put "-$" before them.
Otherwise I just put "$" there.
I will read your link and write a filter to do this.
Thanks again.
On Oct 16, 4:53 pm, "Michael P. Jung" <mpj...@terreon.de> wrote:
> > I would like to use if clause to check if a number is nagative or not
> > with template in my html file. I read related part in Django template
> > online document however I did not find what I need.
>
> > Is it possilbe to do this with built-in Django filter functions? Or do
> > I have to install a third-party template library?
>
> You could either use the 'smarter {% if %} tag', which might be added to
> Django 1.2 according to the "Features under consideration" list in the
> Wiki. Grab it fromhttp://www.djangosnippets.org/snippets/1350/
>
> Or write a custom template filter. Since writing filters is so straight
> forward and simple I recommend you to look into the
> docs:http://docs.djangoproject.com/en/dev/howto/custom-template-tags/#writ...
>
> There is no built-in filter for this in Django as it's a vital sign that
> you're mixing template logic with view logic. I recommend you to ask
> yourself the following question: "Does my template really have to figure
> out x < y itself or shouldn't it just get this information from the view?".
>
> If it's a common thing you might be better of writing a filter or
> template tag specific to your use case.
>
> I know it's hard to resist the urge "but I just want...". I can tell
> from experience that investing that extra bit of time to do things the
> right way pays off in the long run. Especially as you can later reuse
> the code more easily.
>
> Sometimes even simple stuff like {% ifequals foo 0 %} would fit better
> into a custom filter. Just think of floating point values that are
> almost zero. It's {% if foo|abs < 0.001 %} vs {% if foo|is_near_zero %}.
> The latter provides you with the possibility to configure the threshold
> in the config file while the former has the logic hardcoded in the template.
>
> --mp
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