使用ModelChoiceField的Django窗體始終無效

Question

以下是我的模板的相關部分。我試圖將所選字段從下拉列表發送到我的表單。從視圖

<form action="character_chat" method="post"> 
    <select id="character_name"> 
     {% for character in characters %} 
     <option name={{character}}>{{character}}</option> 
     {% endfor %} 
    </select> 
    <input type="submit" value="Select"> 
</form> 

相關代碼：

def character_chat(request): 
    class CharacterForm(forms.Form): 
     character_name = forms.ModelChoiceField(queryset=Character.objects.all()) 

    if request.method == 'POST': 
     form = CharacterForm(request.POST) 
     if form.is_valid(): 
      print("Valid form!") 
      print(form.cleaned_data['character_name']) 

我從來沒有看到打印語句，如此看來形式最終總是無效。任何建議或意見將不勝感激！

Answer 1

您應該在模板中使用{{ form.character_name }}。不需要創建一個html select元素，因爲Django免費提供這個功能。此外，Django實際上使用了HTML屬性name，而不是id。另外，如果你想要做像這樣不使用form從你的情況下，你<option>標籤看起來更象這樣：

<option value={{character.id}}>{{character}}</option> 

退房更多信息的文檔：https://docs.djangoproject.com/en/1.10/topics/forms/#rendering-fields-manually

更新因評論：

您需要將表單放入模板的上下文中，然後才能使用它。下面是從the Django form docs取一個真正適用的例子：

from django.shortcuts import render 
from django.http import HttpResponseRedirect 

from .forms import NameForm 

def get_name(request): 
    # if this is a POST request we need to process the form data 
    if request.method == 'POST': 
     # create a form instance and populate it with data from the request: 
     form = NameForm(request.POST) 
     # check whether it's valid: 
     if form.is_valid(): 
      # process the data in form.cleaned_data as required 
      # ... 
      # redirect to a new URL: 
      return HttpResponseRedirect('/thanks/') 

    # if a GET (or any other method) we'll create a blank form 
    else: 
     form = NameForm() 

    return render(request, 'name.html', {'form': form}) 

注意一下，如果請求方法是GET，他們提供與模板的要求，並把form上下文字典裏面？這也是你需要做的：

def character_chat(request): 
    class CharacterForm(forms.Form): 
     character_name = forms.ModelChoiceField(queryset=Character.objects.all()) 

    if request.method == 'POST': 
     form = CharacterForm(request.POST) 
     if form.is_valid(): 
      print("Valid form!") 
      print(form.cleaned_data['character_name']) 
      # now you should redirect 
    else: # GET request method 
     form = CharacterForm() 
     return render(request, 'NAME OF YOUR TEMPLATE HERE', {'form': form})