Flask 三方组件 WTForms

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

from flask import Blueprint
from flask import request
from flask import render_template
from wtforms.fields import simple, core   #simple:简单的字段
from wtforms import Form, validators #validators:校验条件

reg = Blueprint("reg", __name__)


class RegForm(Form):
    username = simple.StringField(
        label="用户名:",  #前端显示的字段
　　　　　#default:None, #组件生成后的默认值　
        id="username",
        render_kw={"class": " form-control col-sm-2 "}, #为标签创建属性
        validators=[ #声明校验条件
            validators.DataRequired(message="用户名不能为空"),
            validators.Length(min=2, max=7, message="用户名不能小于%(min)d,不能大于%(max)d")

        ]
    )
    password = simple.PasswordField(
        label="密码:",
        id="password",
　　　　　render_kw={"class": " form-control col-sm-2 "},
        validators=[
            validators.DataRequired(message="密码不能为空"),
            validators.Length(min=6, max=16, message="用户名不能小于%(min)d,不能大于%(max)d")

        ]
    )
    repassword = simple.PasswordField(
        label="确认密码",
        render_kw={"class": " form-control col-sm-2 "},
        validators=[
            validators.EqualTo("password", message="密码不一致")
        ]

    )

    email = simple.StringField(
        label="邮箱",
        render_kw={"class": " form-control col-sm-2 "},
        validators=[
            validators.Email(message="邮箱格式不符")
        ]
    )

    gender = core.RadioField(
        label="性别",
        choices=[
            (1, "男"),
            (2, "女")

        ],
        coerce=int

    )

    hobby = core.SelectMultipleField(
        label="爱好",
        choices=[
            (1, "抽烟"),
            (2, "喝酒"),
            (3, "烫头"),
        ],
        coerce=int
    )

    sub = simple.SubmitField(
        label="注册",

    )


@reg.route("/reg", methods=["GET", "POST"])
def reg_func():
    if request.method == "GET":
        reg = RegForm()  #实例化对象
        return render_template("reg.html", reg=reg)
    else:
        new_reg = RegForm(formdata=request.form)
        if new_reg.validate():
            return "注册成功"
        else:
            return render_template("reg.html", reg=new_reg)

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>

</head>
<body>
<form action="" method="post" novalidate>
    {{ lf.username.label }} {{ lf.username }} {{ lf.username.errors.0 }}
    {{ lf.password.label }} {{ lf.password }} {{ lf.password.errors.0 }}
    {{ lf.sub }}
</form>
</body>
</html>

reg.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>

</head>
<body>
<form action="" method="post">
    {% for f in regf %}
        {% if  f.label == "登陆" %}
            <p>{{ f }}{{ f.errors.0 }}</p>
        {% else %}
            <p>{{ f.label }}{{ f }}{{ f.errors.0 }}</p>
        {% endif %}
    {% endfor %}

</form>

</body>
</html>