自定义Form组件

发布时间：2020-12-15 17:21:03 所属栏目：大数据来源：网络整理

导读：div id="cnblogs_post_body" class="blogpost-body" h1 class="title"一、获取类里面的静态属性以及动态属性的方法 p class="secondtitle"方式一： div class="cnblogs_code" = 123 = 123 = 456 = = = 123 = = 22 (cls,*args,** (cls. object. Foo2() = span

<div id="cnblogs_post_body" class="blogpost-body">
<h1 class="title">一、获取类里面的静态属性以及动态属性的方法
方式一：


= 123
     = 123= 456
    = =

= 123 = = 22 (cls,*args,**(cls. object.Foo2()

=# ===========自定义插件===============
class TextInput(object):
def str(self):
return '<input type="text">'

class EmailInput(object):
def str(self):
return '<input type="email">'

# ============字段：内部包含正则用于验证======================
class Field(object):
def init(self,required=True,error_message=None,widgets= None):
self.required = required
self.error_message = error_message
if not widgets:
self.widgets = TextInput() #设置默认
else:
self.widgets = widgets

</span><span style="color: #0000ff;"&gt;def</span> <span style="color: #800080;"&gt;__str__</span><span style="color: #000000;"&gt;(self):
    </span><span style="color: #008000;"&gt;#</span><span style="color: #008000;"&gt; return self.widgets</span>
    <span style="color: #0000ff;"&gt;return</span> str(self.widgets)  <span style="color: #008000;"&gt;#</span><span style="color: #008000;"&gt;将对象转成字符串</span>

class CharField(Field):

</span><span style="color: #0000ff;"&gt;def</span><span style="color: #000000;"&gt; valid(self,val):
    </span><span style="color: #0000ff;"&gt;if</span><span style="color: #000000;"&gt; self.required:
        </span><span style="color: #0000ff;"&gt;if</span> <span style="color: #0000ff;"&gt;not</span><span style="color: #000000;"&gt; val:
            msg </span>= self.error_message[<span style="color: #800000;"&gt;'</span><span style="color: #800000;"&gt;required</span><span style="color: #800000;"&gt;'</span><span style="color: #000000;"&gt;]
            </span><span style="color: #0000ff;"&gt;raise</span> ValidateError(msg)  <span style="color: #008000;"&gt;#</span><span style="color: #008000;"&gt;调用自定义的异常</span>
    <span style="color: #0000ff;"&gt;return</span><span style="color: #000000;"&gt; val

class EmailField(Field):
ERG = "^w+@w+$"
def valid(self,val):
if self.required:
if not val:
msg = self.error_message['required']
raise ValidateError(msg)
# print(val,type(val))
result = re.match(self.ERG,val)
if not result:
msg = self.error_message.get('invalid','格式错误')
raise ValidateError(msg)
return val

# ==========================
class Form(object):
def init(self,data):
# print(UserForm.dict)#获取派生类中的所有静态字段
# print(self.class.dict) #静态动态的获取类中的所有静态字段
self.data = data
self.fields = copy.deepcopy(self.class.declare_field) #获取字段
self.clean_data = {}
self.errors = {}
def new(cls,**kwargs): #在new里面也可以获取类中的所有静态字段
declare_field = {}
for field_name,field in cls.dict.items():
# print(field_name,field)
if isinstance(field,Field):
declare_field[field_name] = field
cls.declare_field = declare_field
return object.new(cls) #创建对象

<span style="color: #0000ff;"&gt;def</span><span style="color: #000000;"&gt; is_valid(self):
    </span><span style="color: #008000;"&gt;#</span><span style="color: #008000;"&gt;用户提交的数据</span>
    <span style="color: #008000;"&gt;#</span><span style="color: #008000;"&gt; self.data  #{'username':"zzz","pwd":18}</span>
    <span style="color: #008000;"&gt;#</span><span style="color: #008000;"&gt; self.fields #{'username': CharField(),"pwd": EmailField()}</span>
    <span style="color: #0000ff;"&gt;for</span> field_name,field <span style="color: #0000ff;"&gt;in</span><span style="color: #000000;"&gt; self.fields.items():
        </span><span style="color: #0000ff;"&gt;try</span><span style="color: #000000;"&gt;:
            input_val </span>=<span style="color: #000000;"&gt; self.data.get(field_name)
            </span><span style="color: #008000;"&gt;#</span><span style="color: #008000;"&gt; print("---------------",field_name,input_val)</span>
            val = field.valid(input_val)  <span style="color: #008000;"&gt;#</span><span style="color: #008000;"&gt;内置的验证规则自己去验证</span>
            method = getattr(self,<span style="color: #800000;"&gt;"</span><span style="color: #800000;"&gt;clean_%s</span><span style="color: #800000;"&gt;"</span>%field_name,None)  <span style="color: #008000;"&gt;#</span><span style="color: #008000;"&gt;默认为None</span>
            <span style="color: #0000ff;"&gt;if</span><span style="color: #000000;"&gt; method:
                val </span>=<span style="color: #000000;"&gt; method(val)
            self.clean_data[field_name] </span>=<span style="color: #000000;"&gt; val
        </span><span style="color: #0000ff;"&gt;except</span><span style="color: #000000;"&gt; ValidateError as e:
            self.errors[field_name] </span>=<span style="color: #000000;"&gt; e.detail
    </span><span style="color: #0000ff;"&gt;return</span> len(self.errors) ==0 <span style="color: #008000;"&gt;#</span><span style="color: #008000;"&gt;根据错误的返回，如果没有错误返回True，有错误返回False</span>

<span style="color: #0000ff;"&gt;def</span>  <span style="color: #800080;"&gt;__iter__</span>(self):  <span style="color: #008000;"&gt;#</span><span style="color: #008000;"&gt;#########自定义生成标签3</span>
    <span style="color: #0000ff;"&gt;return</span> iter(self.fields.values())  <span style="color: #008000;"&gt;#</span><span style="color: #008000;"&gt;返回的是一个迭代器</span>

# =======================
class UserForm(Form):
username = CharField(error_message={'required': '用户名不能为空'},widgets=TextInput())
# email = EmailField(error_message={'required': '密码不能为空','invalid': '邮箱格式错误'},widgets=EmailInput())

obj = UserForm(data={'username':"haiyan","email":"dsfsgd"})
if obj.is_valid():
print(obj.clean_data)
else:
print(obj.errors)

（编辑：李大同）

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