python - for循环外模板中的计数器增量

Question

我需要在循环中进行计数器递增。我查看了 django for.counter，但不幸的是，我的增量并没有完全发生在循环的每次迭代中。那么有没有什么办法可以在 django 模板中实现变量的增量，而无需在我的代码中不费吹灰之力地实现一个新对象来做到这一点而不需要这样的增量？

在下面的代码中，我写的行 {{ count = 0 }}, {{ count += 1 }} 只是为了说明目的。我知道这是行不通的。以下是我的模板的一个非常简化的形式:

<div class="jumbotron slotgroup slotavailable mb-1 mt-5" id="jumbo_week_avail">
  <div class="slot-header" role="alert">
    Headertext
  </div>
  {% if weeklyslotsav %}
    {% for day,daynum in weekzip %}
    {{ count = 0 }}
      {% if daynum in weeklyslotsav.day %}
        {% for weekslotav in weeklyslotsav %}
          {% if weekslotav.day == daynum %}
          <div class="row row_week_avail{{ weekslotav.day }}" id="row_week_avail{{ weekslotav.day }}_{{ count }}">
          </div>
          {{ count += 1 }}
          {% endif}
        {% endfor %}
      {% else %}
      <div class="row row_week_avail{{ daynum }}" id="row_week_avail{{ daynum }}_0">
      </div>
      {% endif %}
    {% endfor %}
  {% else %}
    {% for weekday, weeknum in weekzip %}
    <div class="row row_week_avail{{ weeknum }}" id="row_week_avail{{ weeknum }}_0">
    </div>
    {% endfor %}
  {% endif %}
</div>

以下是我的部分观点:

def edit_doctorslots(request, cliniclabel, doctor_id):
    doctor_id=int(doctor_id)
    doc = get_object_or_404(doctor, docid=doctor_id)
    cl = Clinic.objects.get(label=cliniclabel)
    print("Clinic name", cl.name)
    regularslotsav = ''
    try:
        regularslotsav = Timeslots.objects.filter(clinic =cl, doctor =doc, available =True)
    except:
        pass
    regularslotsbr = ''
    try:
        regularslotsbr = Timeslots.objects.filter(clinic =cl, doctor =doc, available =False)
    except:
        pass

    weekavzip = ''
    try:
        weeklyslotsav = Weekdays.objects.filter(clinic =cl, doctor =doc, available =True)
        weekav = range(0, len(weeklyslotsav))
        weekavzip = list(zip(weeklyslotsav, weekav))
    except:
        pass
    weeklyslotsbr = ''
    try:
        weeklyslotsbr = Weekdays.objects.filter(clinic =cl, doctor =doc, available =False)
    except:
        pass

    formslot = SlotForm()
    formspecialdays = SpecialdaysForm()
    formweekdays = WeekdaysForm()
    weekdays = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday']
    weekdaynum = [0,1,2,3,4,5,6]
    weekzip = list(zip(weekdays, weekdaynum))
    newweekzip = weekzip

    return render(request, 'clinic/editslots0.html', {'rnd_num': randomnumber(), 'clinic': cl, 'doctor': doc, 'formslot': formslot, 'formspecialdays': formspecialdays, 'formweekdays': formweekdays, 'weekzip': weekzip, 'newweekzip': newweekzip, 'regav': regularslotsav, 'regbr': regularslotsbr, 'weekav': weekavzip, 'weekbr': weeklyslotsbr, 'weeklyslotsav': weeklyslotsav })

我在 SO 上看到过很多类似的问题。然而，在所有这些中，我都看到人们介绍了 for.counter。但这不适合我的目的。

Answer 1

您可以使用 with 标签将模板中的变量设置为 -

{% with count=0  %}        
   {{ count}}
    ...do other stuffs 
{% endwith %}

对于数学你可以使用 django math filters 喜欢

{{ count|add:"1"}}

您可以使用两者来编写代码。

有关在 Django 模板中设置变量的更多信息 - How to set a value of a variable inside a template code?

以及在 Django 中使用数学 - How to do math in a Django template?

希望对你有帮助。