form的valid驗證的原理

import re

import copy
class
validateerror(exception):
def __init__(self,detail):
self.detail =detail
# ###################### 外掛程式
class textinput(object
): def __str__(self):
return""
class emailinput(object
): def __str__(self):
return""
# ###################### 內部包含正則，用於驗證
class field(object
): def __init__(self,required=true,error_messages=none,widget=none):
self.required =required
self.error_messages =error_messages
ifnot widget:
self.widget =textinput()
else
: self.widget =widget
def __str__(self):
return
str(self.widget)
class
charfield(field):
def valid(self,val):
ifself.required:
ifnot val:
msg = self.error_messages['
required']
raise validateerror(msg)
return
valclass
emailfield(field):
reg = "
^\w+@\w+$
"def valid(self,val):
ifself.required:
ifnot val:
msg = self.error_messages['
required']
raise validateerror(msg)
result =re.match(self.reg,val)
ifnot result:
msg = self.error_messages.get('
invalid
','格式錯誤')
raise validateerror(msg)
return
val# ###################### form，獲取使用者提交內容+獲取定義的字段物件
class form(object
): def __init__(self,data=none):
# 獲取派生類中的所有靜態字段
# print(self.__class__.__dict__)
self.data =data
self.fields =copy.deepcopy(self.__class__.declare_field)
self.cleaned_data ={}
self.errors ={}
def __new__(cls, *args, **kwargs):
declare_field ={}
for field_name, field in
cls.__dict__.items():
ifisinstance(field,field):
declare_field[field_name] =field
cls.declare_field =declare_field
return
object
.__new__(cls)
def is_valid(self):
# 使用者提交的資料
# self.data # 
# self.fields # 
for field_name,filed in
self.fields.items():
try:
input_val = self.data.get
(field_name)
val =filed.valid(input_val)
method = getattr(self,"
cleaned_%s
" %field_name,none)
ifmethod:
val =method(val)
self.cleaned_data[field_name] =val
except validateerror 
ase:
self.errors[field_name] =e.detail
return len(self.errors) == 0
def __iter__(self):
return
iter(self.fields.values())
class
userform(form):
username = charfield(error_messages=,widget=textinput())
pwd = emailfield(error_messages=,widget=emailinput())
# ############### 應用
obj = userform(data=)
ifobj.is_valid():
print(
'驗證成功
',obj.cleaned_data)
else
: print(
"驗證失敗
",obj.errors)
# ##################### html #####################
for x in
obj:
print(x)

form元件的驗證

django 的form元件可以實現自定義的驗證規則。建立基於form的類，在類中建立字段，定義規則。建立該類的物件，並將待驗證的資料傳入，使用is valid 函式。is valid 函式的原始碼實現是 通過full clean 函式挖出存在的errors並返回，如果沒錯誤，則返回true。校驗多...

Django中的Form表單驗證

前端有若干個input輸入框，將使用者輸入內容，以字典傳遞給後端。後端預先存在乙個form表單驗證的基類，封裝了乙個檢測使用者輸入是否全部通過的方法。該方法會先定義好錯誤資訊的字典，並會遍歷類的所有屬性 對應前端待驗證的輸入域 呼叫各自的驗證方法，將錯誤資訊 兩類，必要與否以及格式正確與否 存入字典...

Valid註解的使用

在實體類上打上註解 data public class user2.在controller上加上註解 valid，進行引數校驗 public string testuser requestbody valid user user,bindingresult bindingresult return ...