使用 WTForms 进行表单验证的例子

#使用 WTForms 进行表单验证的例子

from wtforms import Form

from wtforms import BooleanField

from wtforms import TextField

from wtforms import PasswordField

from wtforms import validators

#注册表单

class RegisterForm(Form):

    username = TextField("Username",[validators.length(min=4, max=25)])

    email = TextField("Email Address", [validators.length(min=6, max=25)])

    password = PasswordField("New Password", [validators.Required(), validators.EqualTo("confirm", message="Passwords must match")])

    confirm = PasswordField("Repeat Password")

    accept_tos = BooleanField("I accept the TOS", [validators.Required()])

#视图函数

@app.route("/register", methods=["GET", "POST"])

def register():

    form = RegisterForm(request.form)

    if request.method == "POST" and form.validate():

        user = User(form.username.data, form.email.data, form.password.data)

        db_session.add(user)

        flash("Thanks for registering")

        return redirect(url_for("login"))

    return rendertemplate("regiser.html", form=form)

#备忘表

# 1、如果数据是以POST方式提交的，那么基于请求的form属性的值创建表单，反过来，如果是以get提交的，就从args属性创建

# 2、验证表单数据，调用validate()方法，如果数据验证通过，此方法将会返回True,否则返回False

# 3、访问表单的单个值，使用form.<NAME>.data

#模版中的表单

{% macro render_field(field) %}

  <dt>{{ field.label }}

  <dd>{{ field(**kwargs)|safe }}

  {% if field.errors %}

    <ul class=errors>

    {% for error in field.errors %}

      <li>{{ error }}</li>

    {% endfor %}

    </ul>

  {% endif %}

  </dd>

{% endmacro %}