使用 WTForms 進行表單驗證的例子

#使用 WTForms 進行表單驗證的例子

from wtforms import Form
from wtforms import BooleanField
from wtforms import TextField
from wtforms import PasswordField
from wtforms import validators

#註冊表單
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()])


#視圖函數
@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)
#備忘表
# 一、若是數據是以POST方式提交的，那麼基於請求的form屬性的值建立表單，反過來，若是是以get提交的，就從args屬性建立
# 二、驗證表單數據，調用validate()方法，若是數據驗證經過，此方法將會返回True,不然返回False
# 三、訪問表單的單個值，使用form.<NAME>.data


#模版中的表單

{% 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 %}