Question

Im getting strangest error in django so far:

'if' statement improperly formatted

Template that raises the error is this:

{% if diff >= 0 %}
<span class="pos">+{{ diff }}
{% else %}
<span class="neg">-{{ diff }}
{% endif %}
</span>
<span>{{ a }}</span>

view that has a and diff in context is this:

def add(request, kaart_id):
    if request.is_ajax() and request.method == 'POST':
        x = Kaart.objects.get(id=kaart_id)
        x.pos += 1
        x.save
        x = Kaart.objects.get(id=kaart_id)      
        from django.utils import simplejson
        diff = x.pos - x.neg
        a = "(+1)"
        context = { 'diff':diff, 'a':a }
        return render_to_response('sum.html', context, context_instance=RequestContext(request))

It does not matter what equation i use in if, >, >=, ==.. they all raise the same error.

and as far as i can tell its all by the book: http://docs.djangoproject.com/en/dev/ref/templates/builtins/#id5

Alan.

Answer 1

Until Django 1.2 lands you are looking for “Smart If”, a Django Template Tag.

A smarter {% if %} tag for django
templates.

While retaining current Django functionality, it also handles
equality,
greater than and less than operators. Some common case examples::

    {% if articles|length >= 5 %}...{% endif %}
    {% if "ifnotequal tag" != "beautiful" %}...{% endif %}

Arguments and operators must have a space between them, so
{% if 1>2 %} is not a valid smart if tag.

All supported operators are: or, and, in, = (or
==), !=, >, >=, < and <=.