Jinja2异常-找不到属性

时间:2019-03-21 05:26:01

标签: html flask jinja2 flask-wtforms

在Flask / Python中解决问题。如果出现了这些错误中的一些,并且我已经能够解决这些错误;但是,我似乎无法深究这一点。

我有一个简单的表格,允许用户登录。

但是每次我加载页面时都会遇到此错误:

jinja2.exceptions.UndefinedError:'shop.forms.LoginForm对象'没有属性'submit'

下面是我正在使用的代码,谢谢。

p.s。我已经看到了有关hidden_​​tag()属性的类似文章,但是建议的修复不适用于这种情况。

routes.py

import os
from flask import render_template, url_for, request, redirect, flash
from shop import app, db
from shop.models import Author, Book, User
from shop.forms import RegistrationForm, LoginForm
from flask_login import login_user, current_user, logout_user, login_required


@app.route("/login", methods=['GET', 'POST'])
def login():
form = LoginForm()
if request.method == 'POST':
    user = User.query.filter_by(email=form.email.data).first()
    if user is not None and user.verify_password(form.password.data):
        login_user(user)
        return redirect(url_for('home'))
return render_template('login.html', title='Login', form=form)

forms.py

from flask_wtf import FlaskForm
from wtforms import StringField, PasswordField, SubmitField, BooleanField
from wtforms.validators import DataRequired, Length, Email, EqualTo

class LoginForm(FlaskForm):
email = StringField('Email', validators=[DataRequired(), Email()])
password = PasswordField('Password', validators=[DataRequired()])
sumbit = SubmitField('Login')

login.html

<!DOCTYPE html>
<html>
<head>
    <title>Login</title>
</head>
<body>



{% extends "layout.html" %}
{% block content %}

<form method="POST" action="">
    {{ form.csrf_token }}
    <div class="">
        {{ form.email.label }} {{ form.email}}
    </div>
    <div class="">
    {{ form.password.label }} {{ form.password}}
    </div>
    <div class="">
        {{ form.submit() }}
    </div>
</form>

{% endblock content %}

</body>
</html>

编辑:从提交中删除()不能解决问题。只需从模板中完全删除按钮的实例即可。见下文:

Screenshot of form on website.

2 个答案:

答案 0 :(得分:1)

form.submit()更改为form.submit,它将在模板中显示“提交”按钮。

以下是使用flask_wtf来登录表单的示例。

使用Flask wtform的示例:

app.py

from flask import render_template, url_for, request, redirect, flash, Flask
from forms import LoginForm

app = Flask(__name__)
app.secret_key = 'secret key'

@app.route("/login", methods=['GET', 'POST'])
def login():
    form = LoginForm()
    if request.method == 'POST':
        user_email = form.email.data
        user_password = form.password.data
        if user_email and user_password:
            return "{} - {}".format(user_email, user_password)
    return render_template('login.html', title='Login', form=form)

if __name__ == '__main__':
    app.run(debug=True)

forms.py

from flask_wtf import FlaskForm
from wtforms import StringField, PasswordField, SubmitField, BooleanField
from wtforms.validators import DataRequired, Length, Email, EqualTo

class LoginForm(FlaskForm):
    email = StringField('Email', validators=[DataRequired(), Email()])
    password = PasswordField('Password', validators=[DataRequired()])
    submit = SubmitField('Login')

login.html

<!DOCTYPE html>
<html>
<head>
    <title>Login</title>
</head>
<body>

<form method="POST" action="">
    {{ form.csrf_token }}
    <div class="">
        {{ form.email.label }} {{ form.email }}
    </div>
    <div class="">
        {{ form.password.label }} {{ form.password }}
    </div>
    <div class="">
        {{ form.submit }}
    </div>
</form>

</body>
</html>

输出:

获取login路线的请求:

Get request of login route

发布login路线的请求:

Post request of login route

更新

requirements.txt

Click==7.0
Flask==1.0.2
Flask-WTF==0.14.2
itsdangerous==1.1.0
Jinja2==2.10
MarkupSafe==1.1.1
Werkzeug==0.15.0
WTForms==2.2.1

我在我的机器和c9.io中都成功运行了这段代码。

获取/login路线的请求(在提交表单之前):

before submitting the login form

提交表格后:

after submitting the login form

答案 1 :(得分:0)

问题解决了!

我没有正确填写Forms.py中的 提交

一个简单的笔误导致我花费了2个小时。