自定义form

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我是靠谱客的博主陶醉寒风，这篇文章主要介绍自定义form，现在分享给大家，希望可以做个参考。

一:form组件分为三类设计思想

设计思想：

复制代码

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插件

字段
　　　　Form

流程:
PS:按照结果反推流程

1,按照内置的form组件,首先会先继承Form,并且静态字段是继承Charfield类

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class UserForm(Form):
name=Charfield(errormsg={'required':'用户名不能为空'},widget=Textinput())
pwd=Emialfield(errormsg={'required':'密码不能为空'})

2,定义Form组件,让UserForm继承

要实现的功能:

1):找到userform的静态字段 PS:通过userform的__dict__方式.

2):找到静态字段后,要获取字段里面的结构 PS:字段继承哪个类,显示方式,客户填入的数据

3):判断客户输入的数据符合要求字段格式的要求 PS:比如Charfield()的格式比如空字符,有正则匹配的

4):校验数据,并把所有的内容放入 cleaned_data里面 PS:还要注意是否有钩子函数,如果有钩子函数,那么数据一定要先通过钩子函数验证过才行.

5):如果数据错误,需要把错误信息放到error表中

6):最后字段在html页面的显示. 通过__iter__方法,把对象变成迭代器,一一生成, PS:这里就需要在另外写不同的类创建不同的html格式

总结:

Form类,是整个组件的中枢,他负责调动整个组件需求,除了自己的主要功能,别的零散需求则分配给下面的字段和组件做

字段(Charfield)负责每个字段的显示

插件field则分配html页面的显示功能

3,上简单代码

复制代码

class Textinput(object):
def __str__(self):
return "12"
class Field(object):
def __init__(self, required=None, invalid=None, errormsg=None,widget=None):
self.msg = None
self.errormsg = errormsg
self.widget=widget
if not self.widget:
self.widget=Textinput()
else:
self.widget=widget
def __str__(self):
return str(self.widget)
#这里一定要加上str
class Emialfield(Field):
def valid(self, val):
if self.errormsg:
for msg in self.errormsg:
if msg == 'required':
if not val:
self.msg = self.errormsg['required']
raise Exception(self.msg)
return val
class Charfield(Field):
def valid(self,val):
# if self.required:
# if self.errormsg:
#
if not val:
#这里面可以进行
#
self.errormsg=self.errormsg[self.required]
#
raise Exception(self.errormsg)
#
if self.errormsg:
for msg in self.errormsg:
if msg=='required':
if not val:
self.msg=self.errormsg['required']
raise Exception(self.msg)
return val
import copy
class Form(object):
def __init__(self,data):
self.data=data
self.field_dct=copy.deepcopy(self.__class__.field_dct)
self.cleaned_data={}
self.errmsg={}
def __new__(cls, *args, **kwargs):
dct={}
for key,field in cls.__dict__.items():
if isinstance(field,Field):
#找到所有的静态字段
dct[key]=field
cls.field_dct=dct
return super().__new__(cls)
def is_valid(self):
for key,field in self.field_dct.items():
try:
value=field.valid(self.data.get(key,None))
self.cleaned_data[key]=value
except Exception as e:
self.errmsg[key]=str(e)
return len(self.errmsg)==0
def __iter__(self):
return iter(self.field_dct.values())
class UserForm(Form):
name=Charfield(errormsg={'required':'用户名不能为空'},widget=Textinput())
pwd=Emialfield(errormsg={'required':'密码不能为空'})
obj=UserForm(data={'name':'alex','pwd':123})
if obj.is_valid():
print(obj.cleaned_data)
else:
print(obj.errmsg)
for i in obj:
print(i)

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class Textinput(object):
def __str__(self):
return "12"
class Field(object):
def __init__(self, required=None, invalid=None, errormsg=None,widget=None):
self.msg = None
self.errormsg = errormsg
self.widget=widget
if not self.widget:
self.widget=Textinput()
else:
self.widget=widget
def __str__(self):
return str(self.widget)
#这里一定要加上str
class Emialfield(Field):
def valid(self, val):
if self.errormsg:
for msg in self.errormsg:
if msg == 'required':
if not val:
self.msg = self.errormsg['required']
raise Exception(self.msg)
return val
class Charfield(Field):
def valid(self,val):
# if self.required:
# if self.errormsg:
#
if not val:
#这里面可以进行
#
self.errormsg=self.errormsg[self.required]
#
raise Exception(self.errormsg)
#
if self.errormsg:
for msg in self.errormsg:
if msg=='required':
if not val:
self.msg=self.errormsg['required']
raise Exception(self.msg)
return val
import copy
class Form(object):
def __init__(self,data):
self.data=data
self.field_dct=copy.deepcopy(self.__class__.field_dct)
self.cleaned_data={}
self.errmsg={}
def __new__(cls, *args, **kwargs):
dct={}
for key,field in cls.__dict__.items():
if isinstance(field,Field):
#找到所有的静态字段
dct[key]=field
cls.field_dct=dct
return super().__new__(cls)
def is_valid(self):
for key,field in self.field_dct.items():
try:
value=field.valid(self.data.get(key,None))
self.cleaned_data[key]=value
except Exception as e:
self.errmsg[key]=str(e)
return len(self.errmsg)==0
def __iter__(self):
return iter(self.field_dct.values())
class UserForm(Form):
name=Charfield(errormsg={'required':'用户名不能为空'},widget=Textinput())
pwd=Emialfield(errormsg={'required':'密码不能为空'})
obj=UserForm(data={'name':'alex','pwd':123})
if obj.is_valid():
print(obj.cleaned_data)
else:
print(obj.errmsg)
for i in obj:
print(i)