- 用上下文处理器app_context_processor定义函数
- 获取session中保存的值
- 返回字典
- 在父模板中更新导航，插入登录状态判断代码。
- 注意用{% ... %}表示指令。
- {{ }}表示变量
- 完成注销功能。
- 清除session
- 跳转
from flask import Flask,render_template,request,redirect,url_for,session
from flask_sqlalchemy import SQLAlchemy
import config
app = Flask(__name__)
app.config.from_object(config)
db=SQLAlchemy(app)
class User(db.Model):
__tablename__ = 'User'
id = db.Column(db.Integer,primary_key=True,autoincrement=True)
username = db.Column(db.String(20),nullable=False)
password = db.Column(db.String(20),nullable=False)
@app.route('/')
def home():
return render_template('shouye.html')
@app.route('/sign_in/',methods=['GET','POST'])
def sign_in():
if request.method == 'GET':
return render_template('login.html')
else:
username = request.form.get('username')
password = request.form.get('password')
user = User.query.filter(User.username == username).first()
if user:
if user.password == password:
session['user']=username
session.permanent = True
return redirect(url_for('home'))
else:
return 'password error'
else:
return 'username is not existed.'
@app.route('/sign_up/',methods=['GET','POST'])
def sign_up():
if request.method == 'GET':
return render_template('register.html')
else:
username = request.form.get('username')
password = request.form.get('password')
user = User.query.filter(User.username == username).first()
if user:
return 'username existed.'
else:
user1 = User(username=username, password=password)
db.session.add(user1)
db.session.commit()
return redirect(url_for('sign_in'))
@app.route('/question/')
def question():
return render_template('question.html')
@app.context_processor
def mycontext():
username=session.get('user')
if username:
return {'username':username}
else:
return {}
@app.route('/logout/')
def logout():
session.clear()
return redirect(url_for('shouye'))
if __name__ == '__main__':
app.run(debug=True)
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>
{% block title %}
{% endblock %}
Home</title>
<link rel="stylesheet" href="{{ url_for('static',filename='css/base css.css')}}">
<script src="{{ url_for('static',filename='js/base js.js') }}"></script>
<base target="_blank" />
{% block head %}
{% endblock %}
</head>
<body id="myBody">
<nav class="nav">
<ul>
<div>
{% if username %}
<li><a href="#"style="margin-right: -10px"><img src="../static/images/b219ebc4b74543a96f1bc1d41d178a82b90114a1.jpg">登录</a></li>
<li><a href="{{ url_for('logout') }}"><img src="../static/images/b219ebc4b74543a96f1bc1d41d178a82b90114a1.jpg">注销</a></li>
{% else %}
<a href="{{ url_for('sign_in') }}" style="margin-right: -10px"><img src="../static/images/b219ebc4b74543a96f1bc1d41d178a82b90114a1.jpg">登录</a>
<a href="{{ url_for('sign_up') }}" >注册</a>
{% endif %}
</div>
<img id="on_off" onclick="mySwitch()" src="../static/images/bulbon.jpg" width="50px">
<button style="float: right;margin: 5px auto;border-radius: 5px;height: 30px" type="submit">搜索</button>
<input style="float: right;margin: 5px auto;border-radius: 8px;width: 200px;height: 20px;" type="text" name="search"PLACEHOLDER="输入要搜索的内容">
</ul>
</nav>
{% block main %}
{% endblock %}
</body>
</html>
{% extends'base.html' %}
{% block title %}
Question
{% endblock %}
{% block head %}
<link rel="stylesheet" href="{{ url_for('static',filename='css/question css.css')}}">
{% endblock %}
{% block main %}
<div class="question">
<p class="name">{{ username }}</p>
<h3>发布问答</h3>
<form class="biao">
<div class="form-group">
<label for="ask">Question</label>
<br>
<textarea class="form-control" rows="1" id="ask"></textarea>
</div>
<br>
<div class="form-group">
<label for="questionDetail">Detail</label>
<br>
<textarea class="form-control" rows="8" id="questionDetail"></textarea>
</div>
<p></p>
<input type="checkbox">check me
<br><br>
<button type="submit" class="btn-default">发布</button>
</form>
</div>
{% endblock %}
