wtform的用法

1、登录用法
from flask import Flask, render_template, request, redirect
from wtforms import Form,validators,widgets
from wtforms.fields import core,html5,simple

app = Flask(__name__)

class LoginForm(Form):
    # 字段的定义
    name = simple.StringField(
        label="用户名",
    # 定义规则条件
        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(), # 页面上显示的插件
        render_kw={'class': 'form-control'} # 生成插件加属性
    )
    # 字段的定义
    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)
-----------------------------------------------------------------------------------------------------------------------------------------

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<h1>登录</h1>
<form method="post">
    <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>

############################################################################################################################################
2、注册用法

class RegisterForm(Form):
    name = simple.StringField(
        label='用户名',
        validators=[validators.DataRequired()],
        widget=widgets.TextInput(),
        render_kw={'class': 'form-control'},
        default='小沈'  # 黙认值
    )
    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_confim = simple.PasswordField(
        label='重复密码',
        validators=[
            validators.DataRequired(message='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'},
    )
    # 单选项
    gender = core.RadioField(
        label='性别',
        choices=(
            (1, '男'),
            (2, '女'),
        ),
        coerce=int  # 通过它做转换
    )
    # 单选项下拉框
    city = core.SelectField(
        label='城市',
        choices=(
            ('bj', '北京'),
            ('sh', '上海'),
        )
    )
    # 下拉框多选
    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]  # 默认都选中
    )

    # 重写init方法
    def __init__(self, *args, **kwargs):
        super(RegisterForm, self).__init__(*args, **kwargs)
        self.favor.choices = ((1, '篮球'), (2, '足球'), (3, '羽毛球'))  # 可以从数据库拿数据，这样可以时实更新

    def validate_pwd_confirm(self, field):
        """
        自定义pwd_confim字段规则，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']:  # 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 login():
    if request.method == 'GET':
        form = RegisterForm(data={'gender': 1, 'hobby': [1, 2]})  # 把上面写的gender默认值性别为1  #可以从数据库拿数据也可以放里面
        return render_template('login.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('login.html', form=form)

-----------------------------------------------------------------------------------------------------------------------------

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<h1>用户注册</h1>
<form method="post">
   {% for field in form %}   #  可以循环上面的标签
    <P>{{ field.label }}:{{ field }}{{ field.errors[0] }}</P>
    {% endfor %}
    <input type="submit" value="提交">
</form>
</body>
</html>

巴特西

wtform的用法

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