Flask 在提交表格时验证表格_Flask_Flask Wtforms

Flask 在提交表格时验证表格

flask

Flask 在提交表格时验证表格,flask,flask-wtforms,Flask,Flask Wtforms,我正在尝试创建一个基本表单，但我的提交时验证（）函数没有实现。它只返回nahh，您可以在我的路线中看到它。有人能帮我找出我的密码有什么问题吗验证：- class LoginForm(FlaskForm): username = StringField('username', validators = [ InputRequired(message = "Please Enter the username"), Length(min

我正在尝试创建一个基本表单，但我的

提交时验证（）函数没有实现。

它只返回nahh，您可以在我的路线中看到它。
有人能帮我找出我的密码有什么问题吗
验证：-
class LoginForm(FlaskForm):
    username = StringField('username', validators = [
        InputRequired(message = "Please Enter the username"),
        Length(min = 2, max = 23)
        ])
    password = PasswordField('password', validators = [
        InputRequired(),
        Length(min = 4, max = 25, message="Password must be between 4 and 25 characters")
        ])

路线：-
@app.route('/login', methods = ['GET', 'POST'])
def login():
    form = LoginForm()
    if form.validate_on_submit():
        username = form.username.data
        print(username)
        return username
    return render_template('login.html', form = form)
    
@app.route('/loginn', methods=['POST'])
def loginn():
    form = LoginForm()
    if form.validate_on_submit():
        return "Succeeds"
    else:
        return "Naahh"

Login.html：-
<body>
<form action="/loginn" method="POST">
    Username
  {% if form.username.errors %}
            {{ form.username(class="form-control form-control-lg is-invalid")}}
              {% for error in form.username.errors %}
                <span>{{ error }}</span>
              {% endfor %}
              {% else %}
            {{ form.username(class="form-control form-control-lg")}}

            {% endif %}
              Password
              {% if form.password.errors %}
            {{ form.password(class="form-control form-control-lg is-invalid")}}
              {% for error in form.password.errors %}
                <span>{{ error }}</span>
              {% endfor %}
              {% else %}
            {{ form.password(class="form-control form-control-lg")}}

            {% endif %}
            <button>Submit</button>

</form>
</body>


用户名
{%if form.username.errors%}
{{form.username（class=“form control form control lg无效”）}
{%form.username.errors%中的错误}
{{error}}
{%endfor%}
{%else%}
{{form.username（class=“form control form control lg”）}
{%endif%}
密码
{%if form.password.errors%}
{{form.password（class=“form control form control lg无效”）}
{%form.password.errors%}
{{error}}
{%endfor%}
{%else%}
{{form.password（class=“form control form control lg”）}
{%endif%}
提交
login.html文件中缺少CSRF令牌