wtforms的使用

1.登陆

class LoginForm(Form):
    name = simple.StringField(
        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={'placeholder':'请输入用户名'}
    )
    pwd = simple.PasswordField(
        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-zd$@$!%*?&]{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')

        ],
        render_kw={'placeholder':'请输入密码'}
    )

@app.route('/login',methods=['GET','POST'])
def login():
    if request.method == "GET":
        form = LoginForm()
        # print(form.name,type(form.name)) # form.name是StringField()对象, StringField().__str__
        # print(form.pwd,type(form.pwd))   # form.pwd是PasswordField()对象,PasswordField().__str__
        return render_template('login.html',form=form)

    form = LoginForm(formdata=request.form)
    if form.validate():
        print(form.data)
        return redirect('https://www.luffycity.com/home')
    else:
        # print(form.errors)
        return render_template('login.html', form=form)

2.注册

class 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 # int("1")
    )
    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, ]
    )



@app.route('/register', methods=['GET', 'POST'])
def register():
    if request.method == 'GET':
        form = RegisterForm()
        return render_template('register.html', form=form)

    form = RegisterForm(formdata=request.form)
    if form.validate():
        print(form.data)
        return redirect('https://www.luffycity.com/home')

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

3.从数据库取出数据

import helper
class UserForm(Form):
    city = core.SelectField(
        label='城市',
        choices=(),
        coerce=int
    )
    name = simple.StringField(label='姓名')

    def __init__(self,*args,**kwargs):
        super(UserForm,self).__init__(*args,**kwargs)

        self.city.choices=helper.fetch_all('select id,name from tb1',[],type=None)


@app.route('/user')
def user():
    if request.method == "GET":
        #form = UserForm(data={'name':'alex','city':3})
        form = UserForm()
        return render_template('user.html',form=form)

 前端模版如何使用wtforms

<form method="post" novalidate>
    {% for field in form %}
    <p>{{field.label}}: {{field}}   {{field.errors[0]}}</p>
    {% endfor %}

    <input type="submit" value="提交">
</form>

 钩子函数的使用

使用方法"validate_字段名称"，与django的form模块的钩子函数的"clean_函数名"相同
def validate_name(self, field):
    """
    自定义name字段规则
    :param field:
    :return:
    """
    # 最开始初始化时，self.data中已经有所有的值
    print('钩子函数获取的值',field.data)
    if not field.data.startswith('old'):
        raise validators.ValidationError("用户名必须以old开头") # 继续后续验证
        # raise validators.StopValidation("用户名必须以old开头")  # 不再继续后续验证