折腾：
期间，继续去试试Flask的flash功能
参考：
Message Flashing — Flask Documentation (0.11)
试试代码：
(SIPEvents) SIPEvents cat flash.py from flask import Flask, flash, redirect, render_template, \ request, url_for app = Flask(__name__) app.secret_key = ‘some_secret’ @app.route(‘/’) def index(): return render_template(‘index.html’) @app.route(‘/login’, methods=[‘GET’, ‘POST’]) def login(): error = None if request.method == ‘POST’: if request.form[‘username’] != ‘admin’ or \ request.form[‘password’] != ‘secret’: error = ‘Invalid credentials’ else: flash(‘You were successfully logged in’) return redirect(url_for(‘index’)) return render_template(‘login.html’, error=error) if __name__ == "__main__": app.run() (SIPEvents) SIPEvents cat templates/index.html {% extends "layout.html" %} {% block body %} <h1>Overview</h1> <p>Do you want to <a href="{{ url_for(‘login’) }}">log in?</a> {% endblock %} (SIPEvents) SIPEvents cat templates/login.html {% extends "layout.html" %} {% block body %} <h1>Login</h1> {% if error %} <p class=error><strong>Error:</strong> {{ error }} {% endif %} <form action="" method=post> <dl> <dt>Username: <dd><input type=text name=username value="{{ request.form.username }}"> <dt>Password: <dd><input type=password name=password> </dl> <p><input type=submit value=Login> </form> {% endblock %} (SIPEvents) SIPEvents cat templates/layout.html <!doctype html> <title>My Application</title> {% with messages = get_flashed_messages() %} {% if messages %} <ul class=flashes> {% for message in messages %} <li>{{ message }}</li> {% endfor %} </ul> {% endif %} {% endwith %} {% block body %}{% endblock %} |
效果：
http://115.29.173.126:5000/login
故意输入错误的密码：
对应的log：
(SIPEvents) SIPEvents flask run –host=0.0.0.0 * Serving Flask app "flash" * Forcing debug mode on * Running on http://0.0.0.0:5000/ (Press CTRL+C to quit) * Restarting with stat * Debugger is active! * Debugger pin code: 353-795-063 121.238.252.151 – – [17/Aug/2016 14:28:29] "GET / HTTP/1.1" 200 – 121.238.252.151 – – [17/Aug/2016 14:28:29] "GET / HTTP/1.1" 200 – 121.238.252.151 – – [17/Aug/2016 14:29:23] "GET /login HTTP/1.1" 200 – 121.238.252.151 – – [17/Aug/2016 14:29:48] "POST /login HTTP/1.1" 302 – 121.238.252.151 – – [17/Aug/2016 14:29:48] "GET / HTTP/1.1" 200 – 121.238.252.151 – – [17/Aug/2016 14:29:59] "GET /login HTTP/1.1" 200 – 121.238.252.151 – – [17/Aug/2016 14:30:01] "POST /login HTTP/1.1" 200 – 121.238.252.151 – – [17/Aug/2016 14:30:21] "POST /login HTTP/1.1" 200 – |
然后继续参考：
Message Flashing — Flask Documentation (0.11)
试试：
with_categories
然后用代码：
(SIPEvents) SIPEvents cat flash.py from flask import Flask, flash, redirect, render_template, \ request, url_for app = Flask(__name__) app.secret_key = ‘some_secret’ @app.route(‘/’) def index(): return render_template(‘index.html’) @app.route(‘/login’, methods=[‘GET’, ‘POST’]) def login(): error = None if request.method == ‘POST’: if request.form[‘username’] != ‘admin’ or \ request.form[‘password’] != ‘secret’: #error = ‘Invalid credentials’ flash(u’Invalid password provided’, ‘error’) else: flash(‘You were successfully logged in’) return redirect(url_for(‘index’)) return render_template(‘login.html’, error=error) if __name__ == "__main__": app.run() (SIPEvents) SIPEvents cat templates/layout.html <!doctype html> <title>My Application</title> {% with messages = get_flashed_messages(with_categories=true) %} {% if messages %} <ul class=flashes> {% for category, message in messages %} <li class='{{ category }}’>{{ message }}</li> {% endfor %} </ul> {% endif %} {% endwith %} {% block body %}{% endblock %} |
结果显示错误信息时，没有红色：
难道是：
需要自己去给error的category，加上css，设置为红色
－》然后就可以实现，例子里面说的：当分类为error时显示红色背景？
搜：
flask get_flashed_messages example
flask get_flashed_messages error red
然后从网页中显示：
中看到了：
<!doctype html> <title>My Application</title> <ul class=flashes> <li class=’error’>Invalid password provided</li> </ul> <h1>Login</h1> <form action="" method=post> <dl> <dt>Username: <dd><input type=text name=username value="admin"> <dt>Password: <dd><input type=password name=password> </dl> <p><input type=submit value=Login> </form> |
的确是：
<li class=’error’>Invalid password provided</li>
看来估计需要我们自己去添加css去设置红色背景。。。
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