在Django模板中分组复选框选择多项 [英] Grouped CheckboxSelectMultiple in Django template
问题描述
如何通过相关模型分组由 CheckboxSelectMultiple
生成的复选框?
这是最佳示例
models.py:
class FeatureCategory(models.Model):
name = models.CharField(max_length = 30)
class Feature(models.Model):
name = models.CharField(max_length = 30)
category = models.ForeignKey(FeatureCategory)
类Widget(models.Model):
name = models.CharField(max_length = 30)
features = models.ManyToManyField(Feature,blank = True)
forms.py:
类WidgetForm(forms.ModelForm):
features = forms.ModelMultipleChoiceField(
queryset = Feature .objects.all(),
widget = forms.CheckboxSelectMultiple,
required = False
)
class Meta:
model = Widget
views.py:
def edit_widget(request):
form = WidgetForm()
return render(request,'template.html',{'form':form})
template.html:
{{form.as_p}}
以上产生以下输出:
[]小部件1
[]小部件2
[]小部件3
[]小部件1
[]小部件2
我想要的功能复选框按功能类别分组(基于 ForeignKey
):
类别1:
[]小部件1
[]小部件2
[] Widget 3
类别2:
[]小部件1
[]小部件2
我该如何实现?我尝试使用 {%重组%}
模板标签无效。
任何建议都非常感激。 / p>
谢谢。
您必须编写自定义 CheckboxSelectMultiple
小部件。使用代码段我已尝试使 CheckboxSelectMultiple
通过将 category_name
作为字段 attrs
中的属性添加到字段中。所以我可以在以后的模板中使用 reroup
标签。
以下代码根据您的需要,显然这个代码可以做得更干净,更通用,但在这一刻它不是通用的。
forms.py $ c从django导入窗体
$ d $ d
从django.forms导入Widget
从django.forms。导入SubWidget
from django.forms.util import flatatt
from django.utils.html import conditional_escape
from django.utils.encoding import StrAndUnicode,force_unicode
from django.utils。 safestring import mark_safe
from itertools import chain
import ast
$ b from mysite.models import Widget as wid#你的模型名称与django.forms.Widget有冲突
from mysite.models import功能
class CheckboxInput(SubWidget):
CheckboxRenderer用于表示单个
<输入的对象类型='checkbo X取代。
def __init __(self,name,value,attrs,choice,index):
self.name,self.value = name,value
self.attrs = attrs
self.choice_value = force_unicode(choice [1])$ b $ b self.choice_label = force_unicode(choice [2])
self.attrs.update({'cat_name'选项[0]})
self.index = index
def __unicode __(self):
return self.render()
def render(self,name = None,value = None,attrs = None,choices =()):
name = name或self.name
value = value或self.value
attrs = attrs或self.attrs
如果self.attrs中的'id':
label_for ='for =%s_%s'%(self.attrs ['id'] ,self.index)
else:
label_for =''
choice_label = conditional_escape(force_unicode(self.choice_label))
return mark_safe(u'< label%s>% s%s< / label>'%(label_fo r,self.tag(),choice_label))
def is_checked(self):
return self.choice_value in self.value
def tag(self) :
如果self.attrs中的'id':
self.attrs ['id'] ='%s_%s'%(self.attrs ['id'],self.index)
final_attrs = dict(self.attrs,type ='checkbox',name = self.name,value = self.choice_value)
如果self.is_checked():
final_attrs ['checked'] = 'checked'
return mark_safe(u'< input%s />'%flatatt(final_attrs))
class CheckboxRenderer(StrAndUnicode):
def __init __(self, name,value,attrs,choice):
self.name,self.value,self.attrs = name,value,attrs
self.choices = choices
def __iter __自我):
为我,在枚举(self.choices)中的选择:
yield CheckboxInput(self.name,self.value,self.attrs.copy(),choice,i)
def __getitem __(self,idx):
choice = self.choices [idx]#让IndexError propogate
返回CheckboxInput(self.name,self.value,self.attrs.copy(),choice,idx)
def __unicode__ (self):
return self.render()
def render(self):
输出< ul>对于这组复选框字段。
return mark_safe(u'< ul> \\\
%s\\\
< / ul>'%u'\\\
'.join([u' ; li>%s< / li>'
%force_unicode(w)for w in self]))
class CheckboxSelectMultipleIter(forms.CheckboxSelectMultiple):
复选框多选择字段,可以启用每个复选框的迭代
类似于django.forms.widgets.RadioSelect
renderer = CheckboxRenderer
def __init__ (self,* args,** kwargs):
#覆盖默认渲染器如果我们被传递一个
renderer = kwargs.pop('renderer',None)
如果渲染器:
self.renderer = renderer
super(CheckboxSelectMultipleIter,self).__ init __(* args,** kwargs)
def subwidgets(self,name,value,attrs = None,choices =()):
for widget在self.get_renderer(name,value,attrs,choices)中:
yield widget
def get_renderer(self,name,value,attrs = None,choices =()):
返回渲染器的一个实例。
choices_ = [对于a,b,c在...中的
choices_ = [(a [1],b [1],c [1])的ast.literal_eval(i [1])。iteritems() values_]
如果值为None:value =''
str_values = set([force_unicode(v)for v in value])#规范化为字符串。
如果attrs是None:
attrs = {}
如果'id'不在attrs中:
attrs ['id'] = name
final_attrs = self.build_attrs (attrs)
choices = list(chain(choices_,choices))
return self.renderer(name,str_values,final_attrs,choices)
def render(self,name, value,attrs = None,choices =()):
return self.get_renderer(name,value,attrs,choices).render()
def id_for_label(self,id_):
如果id_:
id_ + ='_0'
返回id_
类WidgetForm(forms.ModelForm):
features = forms.ModelMultipleChoiceField(
queryset = Feature.objects.all()。values('id','name','category__name'),
widget = CheckboxSelectMultipleIter,
required = False
)
class Meta:
model = wid
然后在模板中:
{%for fi eld in form%}
{%if field.name =='features'%}
{%regroup field by attrs.cat_name as list%}
< ul>
{%for列表%}
< li> {{el.grouper}}
< ul>
{%for e in el.list%}
{{e}}< br />
{%endfor%}
< / ul>
< / li>
{%endfor%}
< / ul>
{%else%}
{{field.label}}:{{field}}
{%endif%}
{%endfor%}
结果:
我在类别表中添加了国家/地区名称,而城市在功能表中的名称,因此在模板中我可以根据国家(类别)重新组合城市(功能)
How can I group checkboxes produced by CheckboxSelectMultiple
by a related model?
This is best demonstrated by example.
models.py:
class FeatureCategory(models.Model):
name = models.CharField(max_length=30)
class Feature(models.Model):
name = models.CharField(max_length=30)
category = models.ForeignKey(FeatureCategory)
class Widget(models.Model):
name = models.CharField(max_length=30)
features = models.ManyToManyField(Feature, blank=True)
forms.py:
class WidgetForm(forms.ModelForm):
features = forms.ModelMultipleChoiceField(
queryset=Feature.objects.all(),
widget=forms.CheckboxSelectMultiple,
required=False
)
class Meta:
model = Widget
views.py:
def edit_widget(request):
form = WidgetForm()
return render(request, 'template.html', {'form': form})
template.html:
{{ form.as_p }}
The above produces the following output:
[] Widget 1
[] Widget 2
[] Widget 3
[] Widget 1
[] Widget 2
What I would like is for the feature checkboxes to be grouped by feature category (based on the ForeignKey
):
Category 1:
[] Widget 1
[] Widget 2
[] Widget 3
Category 2:
[] Widget 1
[] Widget 2
How can I achieve this? I have tried using the {% regroup %}
template tag to no avail.
Any advice much appreciated.
Thanks.
You have to write the custom CheckboxSelectMultiple
widget. Using the snippet I have tried make the CheckboxSelectMultiple
field iterable by adding the category_name
as an attribute in field attrs
. So that I can use regroup
tag in template later on.
The below code is modified from snippet according to your need, obviously this code can be made more cleaner and more generic, but at this moment its not generic.
forms.py
from django import forms
from django.forms import Widget
from django.forms.widgets import SubWidget
from django.forms.util import flatatt
from django.utils.html import conditional_escape
from django.utils.encoding import StrAndUnicode, force_unicode
from django.utils.safestring import mark_safe
from itertools import chain
import ast
from mysite.models import Widget as wid # your model name is conflicted with django.forms.Widget
from mysite.models import Feature
class CheckboxInput(SubWidget):
"""
An object used by CheckboxRenderer that represents a single
<input type='checkbox'>.
"""
def __init__(self, name, value, attrs, choice, index):
self.name, self.value = name, value
self.attrs = attrs
self.choice_value = force_unicode(choice[1])
self.choice_label = force_unicode(choice[2])
self.attrs.update({'cat_name': choice[0]})
self.index = index
def __unicode__(self):
return self.render()
def render(self, name=None, value=None, attrs=None, choices=()):
name = name or self.name
value = value or self.value
attrs = attrs or self.attrs
if 'id' in self.attrs:
label_for = ' for="%s_%s"' % (self.attrs['id'], self.index)
else:
label_for = ''
choice_label = conditional_escape(force_unicode(self.choice_label))
return mark_safe(u'<label%s>%s %s</label>' % (label_for, self.tag(), choice_label))
def is_checked(self):
return self.choice_value in self.value
def tag(self):
if 'id' in self.attrs:
self.attrs['id'] = '%s_%s' % (self.attrs['id'], self.index)
final_attrs = dict(self.attrs, type='checkbox', name=self.name, value=self.choice_value)
if self.is_checked():
final_attrs['checked'] = 'checked'
return mark_safe(u'<input%s />' % flatatt(final_attrs))
class CheckboxRenderer(StrAndUnicode):
def __init__(self, name, value, attrs, choices):
self.name, self.value, self.attrs = name, value, attrs
self.choices = choices
def __iter__(self):
for i, choice in enumerate(self.choices):
yield CheckboxInput(self.name, self.value, self.attrs.copy(), choice, i)
def __getitem__(self, idx):
choice = self.choices[idx] # Let the IndexError propogate
return CheckboxInput(self.name, self.value, self.attrs.copy(), choice, idx)
def __unicode__(self):
return self.render()
def render(self):
"""Outputs a <ul> for this set of checkbox fields."""
return mark_safe(u'<ul>\n%s\n</ul>' % u'\n'.join([u'<li>%s</li>'
% force_unicode(w) for w in self]))
class CheckboxSelectMultipleIter(forms.CheckboxSelectMultiple):
"""
Checkbox multi select field that enables iteration of each checkbox
Similar to django.forms.widgets.RadioSelect
"""
renderer = CheckboxRenderer
def __init__(self, *args, **kwargs):
# Override the default renderer if we were passed one.
renderer = kwargs.pop('renderer', None)
if renderer:
self.renderer = renderer
super(CheckboxSelectMultipleIter, self).__init__(*args, **kwargs)
def subwidgets(self, name, value, attrs=None, choices=()):
for widget in self.get_renderer(name, value, attrs, choices):
yield widget
def get_renderer(self, name, value, attrs=None, choices=()):
"""Returns an instance of the renderer."""
choices_ = [ast.literal_eval(i[1]).iteritems() for i in self.choices]
choices_ = [(a[1], b[1], c[1]) for a, b, c in choices_]
if value is None: value = ''
str_values = set([force_unicode(v) for v in value]) # Normalize to string.
if attrs is None:
attrs = {}
if 'id' not in attrs:
attrs['id'] = name
final_attrs = self.build_attrs(attrs)
choices = list(chain(choices_, choices))
return self.renderer(name, str_values, final_attrs, choices)
def render(self, name, value, attrs=None, choices=()):
return self.get_renderer(name, value, attrs, choices).render()
def id_for_label(self, id_):
if id_:
id_ += '_0'
return id_
class WidgetForm(forms.ModelForm):
features = forms.ModelMultipleChoiceField(
queryset=Feature.objects.all().values('id', 'name', 'category__name'),
widget=CheckboxSelectMultipleIter,
required=False
)
class Meta:
model = wid
Then in template:
{% for field in form %}
{% if field.name == 'features' %}
{% regroup field by attrs.cat_name as list %}
<ul>
{% for el in list %}
<li>{{el.grouper}}
<ul>
{% for e in el.list %}
{{e}} <br />
{% endfor %}
</ul>
</li>
{% endfor %}
</ul>
{% else %}
{{field.label}}: {{field}}
{% endif %}
{% endfor %}
Results: I added countries name in category table, and cities name in features table so in template I was able to regroup the cities (features) according to country (category)
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