向Django添加字段动态（和干净地） [英] Adding fields to Django form dynamically (and cleanly)

问题描述

我知道这个问题已经被提出了很多次，但是我并没有完全实现。如下所示，我有一个表单，我可以动态地指出要创建多少行。 如何创建一个添加行链接，告诉该视图要创建多少行？我不想增加url ...我真的很喜欢这样做...

 ＃views.py 
 def myView（request）：
如果request.method ==POST：
 form = MyForm （request.POST，num_rows = 1）
 
如果form.is_valid（）：
返回render_to_response（'myform_result.html'，context_instance = RequestContext（request））
 else： 
 form = MyForm（num_rows = 1）
 
返回render_to_response（'myform.html'，{'form'：form}，context_instance = RequestContext（request））
 
 
＃forms.py 
 class MyForm（forms.Form）：
 def __init __（self，* args，** kwargs）：
 num_rows = kwargs.pop（' num_rows'，1）
 super（MyForm，self）.__ init __（* args，** kwargs）
 
用于范围中的行（0，num_rows）：
 field = forms .CharField（label =Row）
 self.fields [str（row）] = field 
 
 
＃myform.html http://example.com/myform 
< form action =。 method =POSTaccept-charset =utf-8> 
< ul> 
 {％表单中的字段％} 
< li style =margin-top：.25em> 
< span class =normal> {{field.label}}< / span> 
 {{field}} 
< span class =formError> {{field.errors}}< / span> 
< / li> 
 {％endfor％} 
< / ul> 
< input type =submitvalue =保存> 
< / form> 
< a href =ADD_ANOTHER_ROW？> + Add Row< / a> 
  

解决方案

当您有一个可变行数的表单您需要的是表单。

Hey guys, I know this question has been brought up numerous times, but I'm not quite getting the full implementation. As you can see below, I've got a form that I can dynamically tell how many rows to create. How can I create an "Add Row" link that tells the view how many rows to create? I would really like to do it without augmenting the url...

# views.py
def myView(request):
    if request.method == "POST": 
        form = MyForm(request.POST, num_rows=1)

        if form.is_valid():
            return render_to_response('myform_result.html', context_instance=RequestContext(request))
    else:
        form = MyForm(num_rows=1)

    return render_to_response('myform.html', {'form':form}, context_instance=RequestContext(request))


# forms.py
class MyForm(forms.Form):
    def __init__(self, *args, **kwargs):
        num_rows = kwargs.pop('num_rows',1)
        super(MyForm, self).__init__(*args, **kwargs)

        for row in range(0, num_rows):
            field = forms.CharField(label="Row")
            self.fields[str(row)] = field


# myform.html  http://example.com/myform
<form action="." method="POST" accept-charset="utf-8">
    <ul>
        {% for field in form %}
            <li style="margin-top:.25em">
                <span class="normal">{{ field.label }}</span> 
                {{ field }}
                <span class="formError">{{ field.errors }}</span>
            </li>
        {% endfor %}
    </ul>
    <input type="submit" value="Save">
</form>
<a href="ADD_ANOTHER_ROW?">+ Add Row</a>

解决方案

When you have a form with a variable number of rows, what you need is a formset.

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