Flask的WTforms

一、简单介绍

WTForms是一个支持多个web框架的form组件，主要用于对用户请求数据进行验证。

类似于Django中的modelform

安装：

pip3 install wtforms

二、简单使用

后端代码app.py

from flask import Flask, request, render_template, session

from flask_session import Session

from redis import Redis

from wtforms import Form, validators, widgets

from wtforms.fields import simple, core

app = Flask(__name__)

app.config["DEBUG"] = True

# 用原生的session要设置SECRET_KEY

# app.config["SECRET_KEY"] = 'uihuiwuiwoiw'

# 使用redis session

app.config["SESSION_TYPE"] = "redis"

# 实例化redis

app.config["SESSION_REDIS"] = Redis(host="127.0.0.1", port=6379) # redis 不要放在公网

# 设置存在客户端的cookies中的session的名字

# app.config["SESSION_COOKIE_NAME"] = "#￥%……&*（#E$RTY$%RTY%^Y&U%^&*"

# 用第三方session替换原生的session；这是基于原生的session的

Session(app)

class LoginForm(Form):

    username = simple.StringField(

        label="用户名",

        validators=[

            validators.DataRequired(message="用户名不能为空"),

            validators.Length(min=4, max=8, message="用户名必须大于等于4，小于等于8")

        ]

    )

    password = simple.PasswordField(

        label="密码",

        validators=[

            validators.DataRequired(message="密码不能为空"),

            validators.Length(min=4, max=8, message="密码必须大于等于4，小于等于8")

        ])

@app.route('/login',methods=['GET','POST'])

def login():

    login_form = LoginForm()

    if request.method == "GET":

        return render_template('login.html', lf=login_form)

    else:

        login_form_data = LoginForm(request.form)

        if login_form_data.validate():

            session['user'] = login_form_data.data.get('username')

            return str(session["user"])

        else:

            return render_template("login.html", lf=login_form_data)

class RegForm(Form):

    username = simple.StringField(

        label="用户名",

        validators=[

            validators.DataRequired(message="用户名不能为空"),

        ]

    )

    password = simple.PasswordField(

        label="密码",

        validators=[

            validators.DataRequired(message="密码不能为空"),

            validators.Length(min=6, max=16, message="密码必须大于等于6，小于等于16")

        ])

    repassword = simple.PasswordField(

        label="确认密码",

        validators=[

            validators.EqualTo("password", message="两次密码不一致")

        ]

    )

    gender = core.SelectField(

        label="性别",

        choices=(

            (1, "女"),

            (2, "男")

        ),

        default=1,

        # widget=widgets.RadioInput(),

        # render_kw={"class": "my_class"},

        coerce=int

    )

    email = simple.StringField(

        label="邮箱",

        validators=[

            validators.DataRequired(message="邮箱不能为空"),

            validators.Email(message="不符合规定")

        ]

    )

    hobby = core.SelectMultipleField(

        label="癖好",

        choices=(

            (1, "萝莉"),

            (2, "御姐"),

            (3, "小哥哥"),

            (4, "正太")

        ),

        # widget=widgets.,

        coerce=int,

        default=(1, 4)

    )

@app.route('/reg', methods=['GET', 'POST'])

def reg():

    if request.method == "GET":

        rf = RegForm()

        return render_template("reg.html", rf=rf)

    else:

        rf_data = RegForm(request.form)

        if rf_data.validate():

            print(rf_data.data.get("hobby"))

            print(type(rf_data.data.get("gender")))

            return "注册成功"

        else:

            return render_template("reg.html", rf=rf_data)

if __name__ == '__main__':

    app.run()

登录模板：login.html

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>Title</title>

</head>

<body>

<form action="" method="post" enctype="multipart/form-data" novalidate>

    <p>{{ lf.username.label }}:{{ lf.username }}{{ lf.username.errors.0 }}</p>

    <p>{{ lf.password.label }}:{{ lf.password }}{{ lf.password.errors[0] }}</p>

    <input type="submit" value="登录">

</form>

</body>

</html>

模板中也可以直接循环获取模板数据如下的注册页面

注册模板：reg.html

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>Title</title>

    <style></style>

</head>

<body>

<form action="" method="post" novalidate>

    {% for field in rf %}

        <p>{{ field.label }}{{ field }} <span style="color: red">{{ field.errors.0 }}</span></p>

    {% endfor %}

    <input type="submit" value="注册">

</form>

</body>

</html>

巴特西

Flask的WTforms

一、简单介绍

二、简单使用

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