flask wtforms组件

一、安装

pip3 install -i https://pypi.douban.com/simple wtforms

二、作用

1、生成HTML标签

2、form表单验证

三、示例

1、登录页面

from wtforms import Form
from wtforms.fields import simple
from wtforms import widgets
from wtforms import validators


class LoginForm(Form):
    name = simple.StringField(
        label='用户名',
        # 校验
        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(),
        # 设置属性
        render_kw={'placeholder':'请输入用户名'}
    )
    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')

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


@app.route('/login/',methods=['GET','POST'])
def login():
    if request.method == "GET":
        form = LoginForm()
        return render_template('login.html',form=form)
    # POST
    form = LoginForm(formdata=request.form)
    if form.validate():
        # print(form.data)
        return redirect('/index/')
    else:
        # print(form.errors)
        return render_template('login.html', form=form)

模板

<form method="post" novalidate>
    <p>{{form.name}}  {{form.name.errors[0]}}</p>
    <p>{{form.pwd}}  {{form.pwd.errors[0]}} </p>
    <p><input type="submit" value="提交"  ></p>
</form>

2、注册页面

from wtforms import Form
from wtforms.fields import simple
from wtforms.fields import html5
from wtforms.fields import core

from wtforms import widgets
from wtforms import validators


class RegisterForm(Form):
    # text
    name = simple.StringField(
        label='用户名',
        validators=[
            validators.DataRequired()
        ],
        widget=widgets.TextInput(),
        render_kw={'class': 'form-control'},
        default='alex'
    )
    # password
    pwd = simple.PasswordField(
        label='密码',
        validators=[
            validators.DataRequired(message='密码不能为空.')
        ],
        widget=widgets.PasswordInput(),
        render_kw={'class': 'form-control'}
    )
    # password
    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'}
    )
    # emial
    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'}
    )
    # radio
    gender = core.RadioField(
        label='性别',
        choices=(
            (1, '男'),
            (2, '女'),
        ),
        coerce=int # int("1")
    )
    # select
    city = core.SelectField(
        label='城市',
        choices=(
            ('bj', '北京'),
            ('sh', '上海'),
        )
    )
    # multiple select
    hobby = core.SelectMultipleField(
        label='爱好',
        choices=(
            (1, '篮球'),
            (2, '足球'),
        ),
        coerce=int
    )
    # checkobx
    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('/index/)

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

模板

<form method="post" novalidate>

    {% for field in form %}
    <p>{{field.label}}: {{field}} {{field.errors[0]}}</p>
    {% endfor %}

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

3、注册页面select选项和数据库同步更新

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)
        # pymysql 语句
        self.city.choices=cursor.execute('select id,name from tb1',[],type=None)

4、编辑数据

form = UserForm(data={'name':'alex','city':3})

传递数据，设置表单的默认值