flask之wtforms 表单验证（一）

一安装wtforms

pip install wtforms

二导入相关模块及对象

from wtforms import Form, widgets, validators

from wtforms.fields import simple

三定义表单类

# 登陆表单

class LoginForm(Form):

    name = simple.StringField(

        label=u'用户名',

        validators=[

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

            validators.Length(min=3, max=8, message=u'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=u'密码',

        validators=[

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

            validators.Length(min=3, max=8, message=u'密码至少大于3个字符'),

            validators.Regexp(regex="\d+",

                              message=u'密码必须是数字')

        ],

        widget=widgets.PasswordInput(),

        render_kw={'class': 'form-control'}

    )

    class Meta:

        csrf = False

    def validate_pwd(self, *args, **kwargs):

        pass

四在视图函数中将表单对象传给模板进行渲染

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

def login():

    if request.method == 'GET':

        form = LoginForm()

        return render_template('login.html', form=form)

    else:

        form = LoginForm(request.form)

        if form.validate():

        else:

            print(form.errors)

        return render_template('login.html', form=form)

五在模板中展示

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>Title</title>

</head>

<body>

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

    <p>{{ form.name.label }} {{ form.name }} {{ form.name.errors.0 }}</p>

    <p>{{ form.pwd.label }} {{ form.pwd }} {{ form.pwd.errors.0 }}</p>

    <input type="submit" value="提交">

</form>

</body>

</html>

界面展示

flask之wtforms 表单验证（一）-LMLPHP

WTForms

flask之wtforms 表单验证（一）