On Mon, 12 Feb 2007 15:32:07 +1100, Malcolm Tredinnick wrote:
> On Mon, 2007-02-12 at 03:49 +0000, Patrick J. Anderson wrote:
>> I think I might be missing something, but I have a problem with
>> date filter. Why doesn't this template code work?
>>
>> {% ifequal d|date:"l" "Sunday" %}
>> <td class="sunday">
>> {% else %}
>> <td>
>> {% endifequal %}
>>
>> <ul><li>{{ d|date:"l" }}</li></ul>
>>
>> But inside the HTML list item {{ d|date:"l" }} produces full weekday
>> names.
>
> The Django resolver for template tags is a bit simple-minded about what
> you can pass as arguments: basically either string literals or
> references to variables in the template's context are permitted. What it
> cannot do is taken something that is a context variable modified by a
> filter and work out that value. So Django is failing quietly on the
> first argument there and effectively comparing the empty string to the
> string "Sunday", I suspect.
>
>> Can and should this evaluation be done in such a way, or perhaps
>> there's a better way or no way this can be done using Django templates?
>
> Assuming this is related to your post from a few hours ago about
> determining if it is the first day of the week, I cannot really think of
> any way to do it with the default filters and template tags. A couple of
> possibilities that spring to mind:
>
> (1) If your object had a "is first day of the week" method, you could
> call that. I realise in this case you are probably passing in standard
> Python datetime objects, in which case you are stuck, but maybe "d" is
> something custom that you have control over and create a method that
> returns a boolean.
>
> (2) Write a custom template tag that tests if the date is the first day
> of the week (or equal to another date). It isn't too hard to write
> custom tags and it really is the recommended way for any kind of
> advanced functionality you want to make accessible through the template.
> You could pass the "d" variable and the day of the week to the tag and
> have it act like an if tag if the args were equal (copying the default
> "if" tag from django/templates/defaulttags.py as a starting point is one
> way to start here).
>
> Regards,
> Malcolm
>
>
>
>
Thanks, Malcolm. I see. I didn't know that a Django tag couldn't take a
variable modified by a filter. Thanks for explaining that part. I'll try
to come up with a custom template tag by looking at the docs and Django
built-in tags in the file you mentioned.
Yes the posts were related, as I'm trying to plot an HTML 28-day calendar
with objects coming from a queryset. It's a little bit challenging with
Python and Django templating, but I'm determined to find a good solution
without resorting to PHP-style mixing of programming logic with
presentation.
Right now, I can easily create that calendar with dates using a custom tag
I write, but the trick is to properly associate events coming from my
model with the dates coming from context in my template tag.
Below is the code I wrote so far (inclusion tag and corresponding calendar
template):
[file:dashboardcalendar.py]
from datetime import datetime, timedelta
from django.template import Library,Node
register = Library()
def plot_calendar(context):
"""
Plot milestones into an XHTML calendar
Calendar starts today and ends at the end of day range defined by days
(default = 28)
"""
week = [datetime.today() + timedelta(days = n) for n in range(7)]
week_days = [d.strftime("%A") for d in week]
if context.has_key('calendar_milestones'):
milestones = context['calendar_milestones']
else:
milestones = None
if not context.has_key('weeks'):
days = int(context['weeks']) * 7
else:
days = 28
dates = []
for n in range(days):
date = datetime.today() + timedelta(days=n)
dates.append(date)
return {
'week_days': week_days,
'calendar_days': dates,
'calendar_milestones': milestones,
}
register.inclusion_tag('dashboard/widgets/calendar.html',
takes_context = True)(plot_calendar)
[file: calendar.html]
{% if week_days %}
<!-- BEGIN upcoming milestones claendar -->
<table summary="Milestones due in the next 4 weeks" cellspacing='1'
class="calendar">
<caption>Milestones due in the next 4 weeks</caption>
<thead>
<tr>
{% for w in week_days %}
<th>{{ w }}</th>
{% endfor %}
</tr>
</thead>
<tbody>
{% if calendar_days %}
{% for d in calendar_days %}
{% if forloop.counter0|divisibleby:7 %}
{% if not forloop.first %}</tr>{% endif %}
{% if not forloop.last %}<tr>{% endif %}
{% endif %}
{% if forloop.first %}
<td class="today">
<ul><li><strong>TODAY</strong>
<!-- if there are milestones due today, show them here
-->
{% else %}
<td>
<ul><li>{{ d|date:"j N" }}
{% endif %}
!-- if there are milestones due today, show them here
-->
</li></ul>
</td>
{% endfor %}
{% else %}
<tr>
<td colspan="7">
<div class="error">Can't create calendar cells because
I don't know
the date range</div>
</td>
</tr>
{% endif %}
</tbody>
</table>
<!-- END upcoming milestones calendar --> {% endif %}
<!-- just testing -->
{% if calendar_milestones %}
<ul>
{% for m in calendar_milestones %}
<li>{{ m.date_close|date:"j F" }} | {{ m.name }} ({{
m.project.name }})</li>
{% endfor %}
</ul>
{% endif %}
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