如何在Django中提交一个带有a href的表单？

Question

我有一个链接，当点击时，应该通过post请求提交一个包含不可见字段的表单。然后我应该能够得到字段值，比如：

var = request.POST.get('name_of_var', '')

在看了几篇文章之后，我似乎无法让这个工作。这就是我目前所拥有的：

<form id="form-id" method="post">
    <li> 
        <input type="hidden" value="{{ obj }}" name="name_of_var">
        <a href="/activities" onclick="document.getElementById('form-id').submit();"> {{obj}} </a>
    </li>
</form>

在我看来，我有这样的想法，但POST请求从未被触发。有什么问题吗？以下内容：

if request.POST:
        var = request.POST.get('name_of_var', '')
        return render_to_response('activities/display_activities.html', var)

编辑：这里是我的视图.py：

def index(request):
    if request.method == "POST":
        var = request.POST.get('name_of_var', '')
        return render_to_response('activities/display_activities.html', var)

    category1 = Service.objects.filter(category = 'Sports')
    category2 = Service.objects.filter(category = 'Dance')
    category3 = Service.objects.filter(category = 'Music')
    category4 = Service.objects.filter(category = 'Academics')
    category5 = Service.objects.filter(category = 'Art')
    category6 = Service.objects.filter(category = 'College')

    subcat1 = []
    subcat2 = []
    subcat3 = []
    subcat4 = []
    subcat5 = []
    subcat6 = []

    for obj in category1:
        subcat1.append(obj.subcategory)
    subcat1 = list(set(subcat1)) 

    for obj in category2:
        subcat2.append(obj.subcategory)
    subcat2 = list(set(subcat2)) 

    for obj in category3:
        subcat3.append(obj.subcategory)
    subcat3 = list(set(subcat3)) 

    for obj in category4:
        subcat4.append(obj.subcategory)
    subcat4 = list(set(subcat4)) 

    for obj in category5:
        subcat5.append(obj.subcategory)
    subcat5 = list(set(subcat5)) 

    for obj in category6:
        subcat6.append(obj.subcategory)
    subcat6 = list(set(subcat6)) 

    return render_to_response('activities/activities.html', {'user': request.user,  
        'category1':category1, 'category2':category2, 'category3':category3, 
        'category4':category4, 'category5':category5, 'category6':category6,  
        'subcat1':subcat1,'subcat2':subcat2, 'subcat3':subcat3, 
        'subcat4':subcat4, 'subcat5':subcat5,'subcat6':subcat6  })

Answer 1

您应该通过以下方式检查POST：

if request.method == "POST":     # this will tell you if you are actually receiving a POST
    ...

而不是这个：

if request.POST:                 # not reliable
    ...

请参阅the docs了解原因。

Answer 2

由于缺乏详细信息，我认为您的请求永远不会被触发，很可能是由于您的href末尾缺少尾随的白色斜杠（假设您正在发布到该url）。这是一个很好的做法，有尾随的白色斜杠后要求！

您的代码：

<a href="/activities/view" onclick="document.getElementById('form-id').submit();"> {{obj}} </a>

应该是

<a href="/activities/view/" onclick="document.getElementById('form-id').submit();"> {{obj}} </a>
#                        ^ Note the trailing slash!

如果对你有用就告诉我

干杯， 生物鸟人

Answer 3

我就是这样解决的。下面是一个与我原来的帖子完全不同的例子。注意：用相关代码替换id和action。在我的示例中，{{form4}是通过视图传入的，它是my forms.py中的一个自定义表单，只有一个字段。

<form id = "form-id" action="/events/attending" method="post">{% csrf_token %}
    <a href="#" onclick="document.forms['form-id'].submit();" >  Submit </a> 
    {{form4.going}} I am attending this event!
</form>