Flask form(登录，注册)

用户登录

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 widgetsapp = Flask(__name__, template_folder='templates')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\d$@$!%*?&]{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(host="127.0.0.1", port=8000)login.py

<!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>

template/login.html

用户注册

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 widgetsapp = Flask(__name__, template_folder='templates')
app.debug = Trueclass RegisterForm(Form):name = simple.StringField(label='用户名',validators=[validators.DataRequired()],widget=widgets.TextInput(),render_kw={'class': 'form-control'},default='alex')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('/register', methods=['GET', 'POST'])
def register():if request.method == 'GET':form = RegisterForm(data={'gender': 1})return render_template('register.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('register.html', form=form)if __name__ == '__main__':app.run()

reg.py

<!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>