python-如何使用formset extra更改标签？

我使用formset产生额外的字段,但是我不知道如何更改formset产生的额外字段的标签.

我的代码：

class GetMachine(forms.Form):
    Number_of_Lines = forms.IntegerField(max_value=4)

class GetLine(forms.Form):
    beamline_name = forms.CharField(max_length=15, label='Name of Beamline-%i')

def install(request):
    MachineFormSet = formset_factory(GetMachine, extra=1)
    formset = MachineFormSet()
    if request.method == 'POST':
#        formset = MachineFormSet(request.POST) 
#        if formset.is_valid(): # All validation rules pass
        line_no = request.POST['form-0-Number_of_Lines']
        GetLineFormSet = formset_factory(GetLine, extra=int(line_no))
        formset = GetLineFormSet()
        return render_to_response('install.html', { 'formset': formset, 'action': 'step1'})
    return render_to_response('install.html', { 'formset': formset, })    

install.html模板：

{% for form in formset.forms %}
{% for field in form %}
    <tr>
        <td>{{ field.label_tag }}</td>  <td>{{ field }}</td><td>{{ field.errors }}</td>
    </tr>
{% endfor %}
{% endfor %}

例如,如果“ Number_of_Lines” = 2,那么我期望带有标签的下一个表格,

Name of Beamline-1:
Name of Beamline-2:

解决方法:

我假设您想要第一种形式的结果来确定第二种形式的字段及其标签,您可能想研究Django form wizards.但这是一个简单的非形式向导(可能不太理想/难以维护) )方法,利用表单集的__init__方法修改表单标签*：

forms.py：

# File: forms.py
from django import forms
from django.forms.formsets import BaseFormSet


# What you've called 'GetMachine'
class MachineForm(forms.Form):
    no_of_lines = forms.IntegerField(max_value=4)


# What you've called 'GetLine'
class LineForm(forms.Form):
    beamline_name = forms.CharField(max_length=15, label='Name of Beamline')


# Create a custom formset and override __init__
class BaseLineFormSet(BaseFormSet):
    def __init__(self, *args, **kwargs):
        super(BaseLineFormSet, self).__init__(*args, **kwargs)
        no_of_forms = len(self)
        for i in range(0, no_of_forms):
            self[i].fields['beamline_name'].label += "-%d" % (i + 1)

views.py：

# File: views.py
from django.forms.formsets import formset_factory
from django.shortcuts import render_to_response
from django.template import RequestContext
from django.http import HttpResponseRedirect
from django.core.urlresolvers import reverse
from forms import MachineForm, LineForm, BaseLineFormSet


def get_no_of_lines(request):
    if request.method == 'POST':
        machine_form = MachineForm(request.POST)
        if machine_form.is_valid():
            # At this point, form fields have already been 
            # converted to Python data types :)
            # so no need to convert `line_no` to an integer
            no_of_lines = machine_form.cleaned_data['no_of_lines']
            return HttpResponseRedirect(reverse('line_form', kwargs={'no_of_lines': no_of_lines}))
    else:
        # It looks to me like you probably don't mean to
        # use formsets here (but a form instead)
        machine_form = MachineForm()

    c = RequestContext(request, {
        'machine_form': machine_form,
    })
    return render_to_response('get_no_of_lines.html', c)


def line_form(request, no_of_lines):
    # You probably should validate this number (again).
    # In fact, you probably need to validate first form (MachineForm).
    # ...But I'm assuming it'll be valid in this example.
    no_of_lines = int(no_of_lines)
    LineFormSet = formset_factory(LineForm, extra=no_of_lines, formset=BaseLineFormSet)
    if request.method == "POST":
        formset = LineFormSet(request.POST, request.FILES)
        if formset.is_valid():
            pass
            # Do stuff with form submission
            # Redirect

    else:
        formset = LineFormSet()

    c = RequestContext(request, {
        'formset': formset,
    })
    return render_to_response('line_form.html', c)

urls.py：

from django.conf.urls import url, patterns
from views import get_no_of_lines, line_form


urlpatterns = patterns('',
     url(r'^$', get_no_of_lines, name='get_no_of_lines'),
     url(r'^line_form/(?P<no_of_lines>\d{1})$', line_form, name='line_form'),
)

get_no_of_lines.html：

<form method="POST">
{% csrf_token %}
{{ machine_form }}
</form>

line_form.html：

<form method="POST">
{% csrf_token %}
{{ formset.as_p }}

我之所以说这种方法可能不是执行此操作的最佳方法,是因为您必须验证传递给line_form视图的no_of_lines(可能大于4,所以您必须在此处执行验证并引入验证逻辑,而不是而不是放在一个地方-形式).而且,如果您需要在第一个表单中添加一个新字段,则可能最终不得不修改代码.因此,为什么我建议研究form wizards.

>有关更多表格或动态表格,请签出Jacob Kaplan-Moss’s post on dynamic form generation.

标签：formset,django-forms,python,django
来源： https://codeday.me/bug/20191031/1975207.html