投票URL

polls/urls.py：

# ex: /polls/5/vote/ url(r'^(?P
     
      [0-9]+)/vote/$', views.vote, name='vote'),
     

创建投票form表单

polls/templates/polls/detail.html：

{
    { question.question_text }}
{% if error_message %}
{
    { error_message }}
{% endif %}
     
          {% csrf_token %}    {% for choice in question.choice_set.all %}        
              
      {
    { choice.choice_text }}
      
    {% endfor %}    
      
     

代码解释：

 {

{ forloop.counter }} : for 循环次数

{% csrf_token %} : 解决POST请求跨域问题 Cross Site Request Forgeries

{% if  %}  {% endif %}:判断

{% for  %} {% endfor %}:循环

投票Views 逻辑处理

投票 views vote in polls/views.py：

from django.http import HttpResponse, HttpResponseRedirectfrom django.urls import reversedef vote(request, question_id):    question = get_object_or_404(Question, pk=question_id)    try:        selected_choice = question.choice_set.get(pk=request.POST['choice'])    except (KeyError, Choice.DoesNotExist):        # Redisplay the question voting form.        return render(request, 'polls/detail.html', {            'question': question,            '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=(question.id,)))

代码解释：

request.POST,request.GET： 分别可获得POST或GET方法的参数值，如上 request.POST['choice'] 可取得POST请求中，name值为choice的Value值。若POST参数中没有choice，则会产生KeyError。

HttpResponseRedirect：重定向跳转，提交成功后进行自动重定向跳转是web 开发的一个良好实践。防止数据提交两次。

投票结果页 Views 逻辑处理

views results in polls/views.py:

from django.shortcuts import get_object_or_404, renderdef results(request, question_id):    question = get_object_or_404(Question, pk=question_id)    return render(request, 'polls/results.html', {'question': question})

投票结果显示 template

polls/templates/polls/results.html：

{
    { question.question_text }}
     
          {% for choice in question.choice_set.all %}        
      
{
    { choice.choice_text }} -- {
    { choice.votes }} vote{
    { choice.votes|pluralize }}
    {% endfor %}
     
Vote again?

实现结果

1、访问detail.html：http://localhost:8000/polls/1/

2、选择后，点击vote投票，跳转到结果页 results.html

 

 

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