python django 表单【Part4】

表单

写一个简单的表单
polls/detail.html
<h1>` poll`.`question `</h1>
{% if error_message %}<p><strong>` error_message `</strong></p>{%

endif %}
<form action="{% url ’polls:vote’ poll.id %}" method="post">
{% csrf_token %}
{% for choice in poll.choice_set.all %}
<input type="radio" name="choice" id="choice` forloop`.`counter `"

value="` choice`.`id `" />
<label for="choice` forloop`.`counter `">` choice`.`choice_text `

</label><br />
{% endfor %}
<input type="submit" value="Vote" />
</form>

表单提交视图：
from django.shortcuts import get_object_or_404, render
from django.http import HttpResponseRedirect, HttpResponse
from django.core.urlresolvers import reverse
from polls.models import Choice, Poll
# ...
def vote(request, poll_id):
p = get_object_or_404(Poll, pk=poll_id)
try:
selected_choice = p.choice_set.get(pk=request.POST[’choice’])
except (KeyError, Choice.DoesNotExist):
# Redisplay the poll voting form.
return render(request, ’polls/detail.html’, {
’poll’: p,
’error_message’: "You didn’t select a choice.",
})
else:
selected_choice.votes += 1
selected_choice.save()
# Always return an HttpResponseRedirect after successfully dealing
# with POST data. This prevents data from being posted twice if a
# user hits the Back button.
return HttpResponseRedirect(reverse(’polls:results’, args=(p.id,)))

投票结果视图：
def results(request, poll_id):
poll = get_object_or_404(Poll, pk=poll_id)
return render(request, ’polls/results.html’, {’poll’: poll})

投票结果模板：polls/results.html
<h1>` poll`.`question `</h1>
<ul>
{% for choice in poll.choice_set.all %}
<li>` choice`.`choice_text ` -- ` choice`.`votes ` vote{{ choice.votes|

pluralize }}</li>
{% endfor %}
</ul>
<a href="{% url ’polls:detail’ poll.id %}">Vote again?</a>