python - 登录到我的烧瓶应用程序后,如何显示注销代替登录/注册?
问题描述
我使用烧瓶和 Jinja 模板创建了一个网站。我创建了一个登录和注册表单。在我主页的标题中,有注册和登录。登录后,我想用注销替换登录/注册。如果有任何解决方案告诉我。这将非常有帮助。提前致谢。代码如下。
索引.html
<nav class="navbar navbar-inverse navbar-fixed-top" style="background-color:
white; border-bottom: #dddddd solid 1px;border-top: none;border-left: none;border-right: none;">
<div class="container-fluid">
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#myNavbar">
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#" style="padding: 10px 20px;margin: 20px 0;">WebSiteName</a>
</div>
<div class="collapse navbar-collapse" id="myNavbar">
<!--ul class="nav navbar-nav">
<li class="active"><a href="#">Home</a></li>
<li><a href="#"></a></li>
<li><a href="#">Page 2</a></li>
<li><a href="#">Page 3</a></li>
</ul-->
<ul class="nav navbar-nav navbar-right ul1">
<li class="li1"><a id="a1" style="color: red;" href="{{ url_for('index') }}">Home</a></li>
<li class="li1"><a id="a1" href="{{ url_for('.index', _anchor='about') }}">About Product</a></li>
<li class="li1"><a id="a1" href="{{ url_for('.index', _anchor='foot') }}">Contact Us</a></li>
{% if is_authenticated == 'true' %}
<li class="li1"><a id="a1" href="{{ url_for('logout') }}">Logout</a></li>
{% else %}
<li class="li1"><a id="a1" href="{{ url_for('signup') }}">Signup</a></li>
<li class="li1"><a id="a1" href="{{ url_for('login') }}">Login</a></li>
{% endif %}
<!--li><a href="#"><span class="glyphicon glyphicon-user"></span> Sign Up</a></li>
<li><a href="#"><span class="glyphicon glyphicon-log-in"></span> Login</a></li-->
</ul>
</div>
</div>
</nav>
应用程序.py
from flask import Flask, render_template, redirect, url_for, flash
from flask_bootstrap import Bootstrap
from flask_wtf import FlaskForm
from wtforms import StringField, PasswordField, BooleanField
from wtforms.validators import InputRequired, Email, Length
from flask_sqlalchemy import SQLAlchemy
from werkzeug.security import generate_password_hash, check_password_hash
from flask_login import LoginManager, UserMixin, login_user, login_required, logout_user, current_user
app = Flask(__name__)
app.config['SECRET_KEY'] = 'Thisissupposedtobesecret!'
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///database.db'
Bootstrap(app)
db = SQLAlchemy(app)
login_manager = LoginManager()
login_manager.init_app(app)
login_manager.login_view = 'login'
class User(UserMixin, db.Model):
id = db.Column(db.Integer, primary_key=True)
username = db.Column(db.String(15), unique=True)
email = db.Column(db.String(50), unique=True)
password = db.Column(db.String(80))
def is_authenticated(self):
"""Return True if the user is authenticated."""
return self.authenticated
@login_manager.user_loader
def load_user(user_id):
return User.query.get(int(user_id))
class LoginForm(FlaskForm):
username = StringField('Username', validators=[InputRequired(), Length(min=4, max=15)])
password = PasswordField('Password', validators=[InputRequired(), Length(min=8, max=80)])
remember = BooleanField('Remember me')
class RegisterForm(FlaskForm):
email = StringField('Email', validators=[InputRequired(), Email(message='Invalid email'), Length(max=50)])
username = StringField('Username', validators=[InputRequired(), Length(min=4, max=15)])
password = PasswordField('Password', validators=[InputRequired(), Length(min=8, max=80)])
@app.route('/')
def index():
return render_template('index.html')
@app.route('/login', methods=['GET', 'POST'])
def login():
form = LoginForm()
if form.validate_on_submit():
user = User.query.filter_by(username=form.username.data).first()
if user:
if check_password_hash(user.password, form.password.data):
login_user(user, remember=form.remember.data)
return redirect(url_for('dashboard'))
return '<h1>Invalid username or password</h1>'
#return '<h1>' + form.username.data + ' ' + form.password.data + '</h1>'
return render_template('login.html', form=form)
@app.route('/signup', methods=['GET', 'POST'])
def signup():
form = RegisterForm()
if form.validate_on_submit():
hashed_password = generate_password_hash(form.password.data, method='sha256')
new_user = User(username=form.username.data, email=form.email.data, password=hashed_password)
db.session.add(new_user)
db.session.commit()
flash('User successfully registered')
return redirect(url_for('login'))
#return '<h1>' + form.username.data + ' ' + form.email.data + ' ' + form.password.data + '</h1>'
return render_template('signup.html', form=form)
@app.route('/dashboard')
@login_required
def dashboard():
return render_template('dashboard.html', name=current_user.username)
@app.route('/logout')
@login_required
def logout():
logout_user()
return redirect(url_for('index'))
if __name__ == '__main__':
app.run(debug=True)
解决方案
只需在模板中使用来自 flask-login 的内置 current_user ,如下所示:
{% if current_user.is_authenticated %}
-- place logout button here --
{% else %}
-- place login button here --
{% endif %}
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