from django import forms, template
from django.conf import settings
from django.template import Variable, loader
from crispy_forms.utils import get_template_pack
register = template.Library()
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@register.filter
def is_checkbox(field):
return isinstance(field.field.widget, forms.CheckboxInput)
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@register.filter
def is_password(field):
return isinstance(field.field.widget, forms.PasswordInput)
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@register.filter
def is_radioselect(field):
return isinstance(field.field.widget, forms.RadioSelect) and not isinstance(
field.field.widget, forms.CheckboxSelectMultiple
)
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@register.filter
def is_select(field):
return isinstance(field.field.widget, forms.Select)
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@register.filter
def is_checkboxselectmultiple(field):
return isinstance(field.field.widget, forms.CheckboxSelectMultiple)
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@register.filter
def is_file(field):
return isinstance(field.field.widget, forms.FileInput)
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@register.filter
def is_clearable_file(field):
return isinstance(field.field.widget, forms.ClearableFileInput)
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@register.filter
def is_multivalue(field):
return isinstance(field.field.widget, forms.MultiWidget)
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@register.filter
def classes(field):
"""
Returns CSS classes of a field
"""
return field.widget.attrs.get("class", None)
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@register.filter
def css_class(field):
"""
Returns widgets class name in lowercase
"""
return field.field.widget.__class__.__name__.lower()
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def pairwise(iterable):
"""s -> (s0,s1), (s2,s3), (s4, s5), ..."""
a = iter(iterable)
return zip(a, a)
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class CrispyFieldNode(template.Node):
def __init__(self, field, attrs):
self.field = field
self.attrs = attrs
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def render(self, context):
# Nodes are not threadsafe so we must store and look up our instance
# variables in the current rendering context first
if self not in context.render_context:
context.render_context[self] = (
Variable(self.field),
self.attrs,
)
field, attrs = context.render_context[self]
field = field.resolve(context)
# There are special django widgets that wrap actual widgets,
# such as forms.widgets.MultiWidget, admin.widgets.RelatedFieldWidgetWrapper
widgets = getattr(field.field.widget, "widgets", [getattr(field.field.widget, "widget", field.field.widget)])
if isinstance(attrs, dict):
attrs = [attrs] * len(widgets)
converters = getattr(settings, "CRISPY_CLASS_CONVERTERS", {})
for widget, attr in zip(widgets, attrs):
class_name = widget.__class__.__name__.lower()
class_name = converters.get(class_name, class_name)
css_class = widget.attrs.get("class", "")
if css_class:
if css_class.find(class_name) == -1:
css_class += " %s" % class_name
else:
css_class = class_name
widget.attrs["class"] = css_class
for attribute_name, attribute in attr.items():
attribute_name = Variable(attribute_name).resolve(context)
attributes = Variable(attribute).resolve(context)
if attribute_name in widget.attrs:
# multiple attribtes are in a single string, e.g.
# "form-control is-invalid"
for attr in attributes.split():
if attr not in widget.attrs[attribute_name].split():
widget.attrs[attribute_name] += " " + attr
else:
widget.attrs[attribute_name] = attributes
return str(field)
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@register.tag(name="crispy_field")
def crispy_field(parser, token):
"""
{% crispy_field field attrs %}
"""
token = token.split_contents()
field = token.pop(1)
attrs = {}
# We need to pop tag name, or pairwise would fail
token.pop(0)
for attribute_name, value in pairwise(token):
attrs[attribute_name] = value
return CrispyFieldNode(field, attrs)
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@register.simple_tag()
def crispy_addon(field, append="", prepend="", form_show_labels=True):
"""
Renders a form field using bootstrap's prepended or appended text::
{% crispy_addon form.my_field prepend="$" append=".00" %}
You can also just prepend or append like so
{% crispy_addon form.my_field prepend="$" %}
{% crispy_addon form.my_field append=".00" %}
"""
if field:
if not prepend and not append:
raise TypeError("Expected a prepend and/or append argument")
context = {
"field": field,
"form_show_errors": True,
"form_show_labels": form_show_labels,
"crispy_prepended_text": prepend,
"crispy_appended_text": append,
}
template = loader.get_template("%s/layout/prepended_appended_text.html" % get_template_pack())
return template.render(context)