为django添加下拉列表

Question

我现在正在学习Django，我试着在网站上添加一个下拉列表。该网站现在将显示一个游戏列表。下拉列表有不同的平台，我想在用户选择一个平台后更改游戏列表。我该怎么办？

在form.py

class platformSelectForm(forms.Form):
    platformsList = (
        ('all', 'Please Select'),
        ('NS', 'Nintendo Switch'),
        ('PS4', 'PlayStation4'),
        ('PS5', 'PlayStation5'),
        ('XBO', 'Xbox One'),
        ('XS', 'Xbox Series S/X'),
    );
    platforms_Select = forms.ChoiceField(widget = forms.Select, choices = platformsList, required = False);

在view.py

class showGameLists(TemplateView):
    template_name = "showList/home.html"
    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs);
        platformSelect = platformSelectForm(self.request.POST or None);
        context['platformSelect'] = platformSelect;
        games = getGames(nowDay.year, nowDay.month, platforms);
        context['games'] = games;
        context['year'] = nowDay.year;
        context['month'] = calendar.month_name[nowDay.month];
        context['prevMonth'] = prevMonth(nowDay);
        context['nextMonth'] = nextMonth(nowDay);
 return context

在urls.py：

from django.urls import path;
from .views import showGameLists;

urlpatterns = [
    path('', showGameLists.as_view(), name='home')
]

在home.html：

<form method = 'POST' action = '/'>
    {% csrf_token %}
    {{ platformSelect.as_p }}
    <input type='submit' value='Submit' />
</form>

    {% for game in games %}
    <div>
        <span><h2>{{game.0}}</h2>
        <p>Release Date: {{ game.1 }}, Metacritic: {{ game.3 }}</p>
        <p>Platform: {% for platform in game.2 %}{{ platform }}/{% endfor %}</p>
        {% if game.4 %}
        <img src={{game.4}} width="367" height="204">
        {% endif %}
    </div>
    {% endfor %}

现在，我可以显示list and submit按钮。但我尝试了很多方法来从下拉列表中获取值，但这也让我错了：

[17/Jan/2021 11:15:29] "POST / HTTP/1.1" 405 0
Method Not Allowed (POST): /
Method Not Allowed: /

Answer 1

你得到了一个Method Not Allowed (POST)错误，因为你正在使用一个TemplateView来提交一个POST请求，你应该像这样使用FormView：

class showGameLists(FormView):
    template_name = "showList/home.html"
    form_class = platformSelectForm # pass your form class here
    
    def form_valid():
        form.save() # process form submit
        return redirect('view_to_redirect_to')