一 . wtforms组件选择框动态数据实时更新

https://www.cnblogs.com/lovershowtime/p/11384494.html

1.wtforms组件使用(登录)

1. 用户登录
当用户登录时候，需要对用户提交的用户名和密码进行多种格式校验。如：
用户不能为空；用户长度必须大于6；
密码不能为空；密码长度必须大于12；密码必须包含 字母、数字、特殊字符等（自定义正则）；

login.html<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<h1>登录</h1>
<form method="post">
    <!--<input type="text" name="name">-->
    <p>{{form.name.label}} {{form.name}} {{form.name.errors[0] }}</p>

    <!--<input type="password" name="pwd">-->
    <p>{{form.pwd.label}} {{form.pwd}} {{form.pwd.errors[0] }}</p>
    <input type="submit" value="提交">
</form>
</body>
</html>

#!/usr/bin/env python
# -*- coding:utf-8 -*-
from flask import Flask, render_template, request,redirect
from wtforms import Form

from wtforms.fields import simple
from wtforms import validators
from wtforms import widgets

app = Flask(__name__, template_folder=‘templates‘)
app.debug = True


class LoginForm(Form):
    name = simple.StringField(
        label=‘用户名‘,
        validators=[
            validators.DataRequired(message=‘用户名不能为空.‘),
            validators.Length(min=6, max=18, message=‘用户名长度必须大于%(min)d且小于%(max)d‘)
        ],
        widget=widgets.TextInput(),
        render_kw={‘class‘: ‘form-control‘}

    )
    pwd = simple.PasswordField(
        label=‘密码‘,
        validators=[
            validators.DataRequired(message=‘密码不能为空.‘),
            validators.Length(min=8, message=‘用户名长度必须大于%(min)d‘),
            validators.Regexp(regex="^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[$!%*?&])[A-Za-z\$!%*?&]{8,}",
                              message=‘密码至少8个字符，至少1个大写字母，1个小写字母，1个数字和1个特殊字符‘)

        ],
        widget=widgets.PasswordInput(),
        render_kw={‘class‘: ‘form-control‘}
    )



@app.route(‘/login/‘, methods=[‘GET‘, ‘POST‘])
def login():
    if request.method == ‘GET‘:
        form = LoginForm()
        return render_template(‘login.html‘, form=form)
    else:
        form = LoginForm(formdata=request.form)
        if form.validate():
            print(‘用户提交数据通过格式验证，提交的值为：‘, form.data)
        else:
            print(form.errors)
        return render_template(‘login.html‘, form=form)

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

2.wtforms组件使用(注册)

注册页面需要让用户输入：用户名、密码、密码重复、性别、爱好等

reg.html<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<h1>用户注册</h1>
<form method="post" novalidate style="padding:0  50px">
    {% for item in form %}
    <p>{{item.label}}: {{item}} {{item.errors[0] }}</p>
    {% endfor %}
    <input type="submit" value="提交">
</form>
</body>
</html>

from flask import Flask, render_template, request, redirect
from wtforms import Form
from wtforms.fields import core
from wtforms.fields import html5
from wtforms.fields import simple
from wtforms import validators
from wtforms import widgets

app = Flask(__name__, template_folder=‘templates‘)
app.debug = True



class RegisterForm(Form):
    name = simple.StringField(
        label=‘用户名‘,
        validators=[
            validators.DataRequired()
        ],
        widget=widgets.TextInput(),
        render_kw={‘class‘: ‘form-control‘},
        default=‘哈哈哈哈哈‘
    )

    pwd = simple.PasswordField(
        label=‘密码‘,
        validators=[
            validators.DataRequired(message=‘密码不能为空.‘)
        ],
        widget=widgets.PasswordInput(),
        render_kw={‘class‘: ‘form-control‘}
    )

    pwd_confirm = simple.PasswordField(
        label=‘重复密码‘,
        validators=[
            validators.DataRequired(message=‘重复密码不能为空.‘),
            validators.EqualTo(‘pwd‘, message="两次密码输入不一致")
        ],
        widget=widgets.PasswordInput(),
        render_kw={‘class‘: ‘form-control‘}
    )

    email = html5.EmailField(
        label=‘邮箱‘,
        validators=[
            validators.DataRequired(message=‘邮箱不能为空.‘),
            validators.Email(message=‘邮箱格式错误‘)
        ],
        widget=widgets.TextInput(input_type=‘email‘),
        render_kw={‘class‘: ‘form-control‘}
    )

    gender = core.RadioField(
        label=‘性别‘,
        choices=(
            (1, ‘男‘),
            (2, ‘女‘),
        ),
        coerce=int
    )
    city = core.SelectField(
        label=‘城市‘,
        choices=(
            (‘bj‘, ‘北京‘),
            (‘sh‘, ‘上海‘),
        )
    )

    hobby = core.SelectMultipleField(
        label=‘爱好‘,
        choices=(
            (1, ‘篮球‘),
            (2, ‘足球‘),
        ),
        coerce=int
    )

    favor = core.SelectMultipleField(
        label=‘喜好‘,
        choices=(
            (1, ‘篮球‘),
            (2, ‘足球‘),
        ),
        widget=widgets.ListWidget(prefix_label=False),
        option_widget=widgets.CheckboxInput(),
        coerce=int,
        default=[1, 2]
    )

    def __init__(self, *args, **kwargs):
        super(RegisterForm, self).__init__(*args, **kwargs)
        self.favor.choices = ((1, ‘篮球‘), (2, ‘足球‘), (3, ‘羽毛球‘))

    def validate_pwd_confirm(self, field):
        """
        自定义pwd_confirm字段规则，例：与pwd字段是否一致
        :param field: 
        :return: 
        """
        # 最开始初始化时，self.data中已经有所有的值

        if field.data != self.data[‘pwd‘]:
            # raise validators.ValidationError("密码不一致") # 继续后续验证
            raise validators.StopValidation("密码不一致")  # 不再继续后续验证


@app.route(‘/reg/‘, methods=[‘GET‘, ‘POST‘])
def register():
    if request.method == ‘GET‘:
        form = RegisterForm(data={‘gender‘: 1})
        return render_template(‘reg.html‘, form=form)
    else:
        form = RegisterForm(formdata=request.form)
        if form.validate():
            print(‘用户提交数据通过格式验证，提交的值为：‘, form.data)
        else:
            print(form.errors)
        return render_template(‘reg.html‘, form=form)


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

十三 .Flask wtforms组件和选择框动态数据实时更新

3.wtforms组件使用(选择框动态数据实时更新)

静态字段

import  cc

class Foo(object):

    country =cc.fetch_all(‘select id,name from student‘,[],type=None)
    def __init__(self):
        self.name = ‘哈哈哈‘

print(Foo.country)
obj = Foo()    #程序运行起来静态只会取一次数据   后面管你实例化多少次都没有用都不会取值   只是最开始取了一次
obj = Foo()
obj = Foo()
obj = Foo()
obj = Foo()
obj = Foo()


# ((1, ‘南昌‘), (2, ‘上海‘), (3, ‘成都‘), (4, ‘爱好‘))

user.html<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body>
    <form method="post">
        {% for field in form %}
        <p>{{field.label}}: {{field}}   {{field.errors[0]}}</p>
        {% endfor %}
        <input type="submit" value="提交">
    </form>
</body>
</html>

from flask import Flask,request,render_template,session,current_app,g,redirect
from wtforms import Form
from wtforms.fields import simple
from wtforms.fields import html5
from wtforms.fields import core

from wtforms import widgets
from wtforms import validators
app = Flask(__name__)

import cc
class UserForm(Form):
    city = core.SelectField(
        label=‘城市‘,
        choices=(),
        coerce=int  #  内部把提交的字符串转换成数字  在匹配
    )
    name = simple.StringField(label=‘姓名‘)
    def __init__(self,*args,**kwargs):      # 每次实例化都会从数据库取一次   做带数据库和展示页面数据实时更新
        super(UserForm,self).__init__(*args,**kwargs)
        self.city.choices=cc.fetch_all(‘select id,name from student‘,[],type=None)  # type=None  表示获取到的数据为元祖


@app.route(‘/user/‘)
def user():
    if request.method == "GET":
        form = UserForm(data={‘name‘:‘李四‘,‘city‘:1})    #设置默认值  编辑 显示默认值
        # form = UserForm()
        return render_template(‘user.html‘,form=form)

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

# mysql> create table student( id int primary key auto_increment,name varchar(20) not null);

数据库连接池


from DBUtils.PooledDB import PooledDB, SharedDBConnection
import pymysql

POOL = PooledDB(
        creator=pymysql,  # 使用链接数据库的模块
        maxconnections=6,  # 连接池允许的最大连接数，0和None表示不限制连接数
        mincached=2,  # 初始化时，链接池中至少创建的空闲的链接，0表示不创建
        maxcached=5,  # 链接池中最多闲置的链接，0和None不限制
        maxshared=3,
        # 链接池中最多共享的链接数量，0和None表示全部共享。PS: 无用，因为pymysql和MySQLdb等模块的 threadsafety都为1，所有值无论设置为多少，_maxcached永远为0，所以永远是所有链接都共享。
        blocking=True,  # 连接池中如果没有可用连接后，是否阻塞等待。True，等待；False，不等待然后报错
        maxusage=None,  # 一个链接最多被重复使用的次数，None表示无限制
        setsession=[],  # 开始会话前执行的命令列表。如：["set datestyle to ...", "set time zone ..."]
        ping=0,
        # ping MySQL服务端，检查是否服务可用。# 如：0 = None = never, 1 = default = whenever it is requested, 2 = when a cursor is created, 4 = when a query is executed, 7 = always
        host=‘127.0.0.1‘,
        port=3306,
        user=‘root‘,
        password=‘root‘,
        database=‘dba1‘,
        charset=‘utf8‘
    )

def connect(type):
    conn = POOL.connection()
    cursor = conn.cursor(cursor=type)
    return conn,cursor


def connect_close(conn,cursor):
    cursor.close()
    conn.close()

def fetch_all(sql,args,type=pymysql.cursors.DictCursor):
    conn,cursor = connect(type)

    cursor.execute(sql, args)
    record_list = cursor.fetchall()
    connect_close(conn,cursor)

    return record_list


def fetch_one(sql, args):
    conn, cursor = connect()
    cursor.execute(sql, args)
    result = cursor.fetchone()
    connect_close(conn, cursor)

    return result


def insert(sql, args):
    conn, cursor = connect()
    row = cursor.execute(sql, args)
    conn.commit()
    connect_close(conn, cursor)
    return row

十三 .Flask wtforms组件和选择框动态数据实时更新

一 . wtforms组件 选择框动态数据实时更新

1.wtforms组件使用(登录)

2.wtforms组件使用(注册)

3.wtforms组件使用(选择框动态数据实时更新)

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一 . wtforms组件选择框动态数据实时更新