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）

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