在Django中使用formset_factory [英] Using formset_factory in Django

问题描述

我是Django的新用户，我使用以下代码生成表单

I'm a new user to Django, i use the following code to produce a form

class GetMachine(forms.Form):
    Machine_Name = forms.CharField(max_length=20) 
    Number_of_lines = forms.IntegerField(max_value=10)

class GetLine(forms.Form):
    Line_name = forms.CharField(max_length=20)

def install(request):
    if request.method == 'POST':
        form = GetMachine(request.POST) 
        if form.is_valid(): # All validation rules pass
            # Process the data in form.cleaned_data
            form = GetLine()
            return render_to_response('install.html', { 'form': form, })
    else:
        form = GetMachine() # An unbound form

    return render_to_response('install.html', { 'form': form, })    

如何修改上述代码，以便Number_of_lines用于创建n个Line_Name表单字段

How can modify the above code, such that the "Number_of_lines" is used to create n number of "Line_Name" form fields.

例如，如果Number_of_lines的值为2，我再次要求用户输入两行的名称为

For example, if the value of Number_of_lines is 2, I would again like to ask the user to enter the name of both the lines as

Line-1的名称：

Name of Line-1:

行2的名称：

推荐答案

从POST数据获取number_of_lines后，可以将该数字作为extra参数传递给formset工厂。

After you get the number_of_lines from the POST data, you can pass that number as the 'extra' parameter to the formset factory.

from django.forms.formsets import formset_factory
...
        form = GetMachine(request.POST) 
        if form.is_valid(): # All validation rules pass
            number_of_lines = form.cleaned_data['Number_of_lines']

            GetLineFormSet = formset_factory(GetLine, extra=number_of_lines)
            formset = GetLineFormset()
            form = GetLine()
...

Protip：您还可以使用max_num参数将行数保持在合理的限制：

Protip: You can also use the max_num parameter to keep the number of lines to a reasonable limit:

GetLineFormSet = formset_factory(GetLine, extra=number_of_lines, max_num=10)

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