仿照wtform自定义Form组件

#!usr/bin/env python
# -*- coding:utf-8 -*-
from flask import Flask,render_template,request,Markup
app = Flask(__name__,template_folder="templates")
app.debug = True
# ==============通过这几个类就可以显示了-==============
#插件
class Widget(object):
    pass

class InputText(Widget):
    def __call__(self, *args, **kwargs):

        return "<input type='text' name='name'>"

class TextArea(Widget):
    def __call__(self, *args, **kwargs):
        return Markup("<textarea name='email'></textarea>")

#Form
class BaseForm(object):
    def __init__(self):
        #获取当前所有的字段
        _fields = {}
        for name, field in self.__class__.__dict__.items():
            if isinstance(field, Field):  # 筛选出字段是name和emailDe
                _fields[name] = field
        self._fields = _fields
        self.data = {}
        # print(_fields)  # {'name': 111, 'email': 222}

    def validate(self,request_data):
        #先找到所有的字段，在执行每一个字段的validate方法
        flag = True
        for name, field in self._fields.items():
            input_val = request_data.get(name,"") #用户输入的值
            result= field.validate(input_val)  #每一个字段自己校验
            print("???????????",input_val,result)
            if not result:
                flag = False
            else:
                self.data[name] = input_val
        return flag
#字段
class Field(object):
    '''所有类的基类'''
    def __str__(self):          #python中的静态字段通过类能找到，通过对象也能找到
        return Markup(self.widget())  #self就是StringField，self

class StringField(Field):  #每个字段打印的时候都要去执行__str__，所以选择放在基类里面，自己没有就调用父类的
    widget = InputText()
    def validate(self,val):
        if val:
            return True

class EmaliField(Field):
    widget = TextArea()
    reg = ".*@.*"

    def validate(self,val):
        import re
        print(re.match(self.reg,val),"************")
        if re.match(self.reg,val):
            return True


# ===============使用===============
class LoginForm(BaseForm):
    name = StringField()
    email = EmaliField()

@app.route('/index', methods=["GET","POST"])
def index():
    form = LoginForm()
    ret = form.validate(request.form)
    print("验证成功",ret)
    print("验证成功的值",form.data)
    # print(form.name)
    # print(form.email)
    return render_template("index.html",form=form)

if __name__ == '__main__':
    app.run()