Question

我需要在循环中进行计数器递增。我看过django for.counter，但是不幸的是，我的增量并没有在循环的每次迭代中完全发生。那么，有什么办法可以在django模板中实现变量的增量，而又不用费力在代码中实现一个新对象而无需增加增量呢？

在下面的代码中，我正在写{{ count = 0 }}，{{ count += 1 }}行，仅用于说明目的。我知道这行不通。以下是我的模板的非常简化的形式：

<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 })

我已经看到许多关于SO的类似问题。但是，在所有这些文章中，我都看到有人介绍for.counter。但这不适合我的目的。

Answer 1

您可以使用with标记将模板中的变量设置为-

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

对于数学，您可以像

一样使用django math filters

{{ count|add:"1" }}

您可以同时使用两者进行编码。

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?

希望这对您有所帮助。

for循环外模板中的计数器增量

1 个答案: