WTForms文档非常不合适,它们甚至没有向您展示自定义窗口小部件的一个示例,该窗口小部件不是从另一个窗口小部件派生的。
我正在尝试创建一个按钮类型,它不是html中的<input>
:
submit = InlineButton(name='submit', type='submit', title='Save this page', textWithinSpan='Save')
这就是我正在尝试的:
from flask.ext.wtf import Required, Length, EqualTo, Field, TextInput, html_params
from flask import Markup
class InlineButtonWidget(object):
text = ''
html_params = staticmethod(html_params)
def __init__(self, input_type='submit', **kwargs):
self.input_type = input_type
def __call__(self, field, **kwargs):
kwargs.setdefault('id', field.id)
kwargs.setdefault('type', self.input_type)
if 'value' not in kwargs:
kwargs['value'] = field._value()
return Markup('<button type="submit" %s><span>%s</span></button>' % (self.html_params(name=field.name, **kwargs), kwargs['textWithinSpan']))
class InlineButton(Field):
widget = InlineButtonWidget()
def __init__(self, label='', **kwargs):
self.widget = InlineButtonWidget('submit', label)
def __call__(self, **kwargs):
return self.widget(self, **kwargs)
def _value(self):
if self.data:
return u', '.join(self.data)
else:
return u''
class SignupForm(Form):
name = TextField('Name', [Length(min=1, max=200)])
submit = InlineButton(name='submit', type='submit', title='Save this page', textWithinSpan='Save')
我甚至不需要Field派生对象。但是当你只使用Widget时它不显示。
当您使用Field对象时,它会为您提供各种无效的参数错误。
即使深入研究WTForms源代码,也很难理解为什么它不能将Kwargs从表单传递给widget。
---更新---
好的,在我提交问题后,我基本上找到了一个可行的解决方案:
class InlineButtonWidget(object):
html_params = staticmethod(html_params)
def __init__(self, input_type='submit', text=''):
self.input_type = input_type
self.text = text
def __call__(self, field, **kwargs):
kwargs.setdefault('id', field.id)
kwargs.setdefault('type', self.input_type)
if 'value' not in kwargs:
kwargs['value'] = field._value()
return Markup('<button type="submit" %s><span>%s</span></button>' % (self.html_params(name=field.name, **kwargs), field.text))
class InlineButton(Field):
widget = InlineButtonWidget()
def __init__(self, label=None, validators=None, text='Save', **kwargs):
super(InlineButton, self).__init__(label, validators, **kwargs)
self.text = text
def _value(self):
if self.data:
return u''.join(self.data)
else:
return u''
class SignupForm(Form):
name = TextField('Name', [Length(min=1, max=200)])
submit = InlineButton('submit', text='Save', description='Save this')
答案 0 :(得分:4)
在Update下回答,但在Field派生类中需要这个init。
def __init__(self, label=None, validators=None, text='Save', **kwargs):
super(InlineButton, self).__init__(label, validators, **kwargs)
self.text = text
答案 1 :(得分:4)
您可以利用该字段的有用属性,即此实例的“描述”和“标签”。这样可以简化设置:
from wtforms.widgets.core import HTMLString, html_params, escape
class InlineButtonWidget(object):
def __call__(self, field, **kwargs):
kwargs.setdefault('type', 'submit')
# Allow passing title= or alternately use field.description
title = kwargs.pop('title', field.description or '')
params = html_params(title=title, **kwargs)
html = '<button %s><span>%s</span></button>'
return HTMLString(html % (params, escape(field.label.text)))
用法:(为了便于阅读而包装)
class MyForm(Form):
foo = BooleanField(
u'Save',
description='Click here to save',
widget=InlineButtonWidget()
)
或者,要有一个字段类型:
class InlineButtonField(BooleanField):
widget = InlineButtonWidget()
class MyForm(Form):
foo = InlineButtonField('Save', description='Save Me')