烧瓶：在返回的render_template（）或redirect（）中包含HTML
[英]Flask: Include HTML in a return render_template() or redirect()
问题描述
I have a login form that checks if the username and password given by the user returns a row or not in the database. 
我有一个登录表单，用于检查用户提供的用户名和密码是否在数据库中返回一行。 If it does, then a session cookie is stored and user is sent back to the index page. 如果是这样，则将存储会话cookie，并将用户发送回索引页面。 If not, the user is sent back to the login page again. 如果不是，则将用户再次发送回登录页面。
Here's a snippet of the relevant code: 这是相关代码的片段：
cur.execute("SELECT COUNT(*) FROM users WHERE username = ? AND password = ?", (request.form['username'], request.form['password']))
data = cur.fetchone()[0]
# If given username and password returns a row, create the session
if data == 0:
return redirect(url_for('index'))
else:
session['username'] = request.form['username']
When the user is sent back to the login page again ( redirect(url_for('index')) ), I want to include a message on the login page saying that the given username or password is invalid. 当用户再次发送回登录页面（ redirect(url_for('index')) ）时，我想在登录页面上包含一条消息，指出给定的用户名或密码无效。
I'm a bit lost on how to do this exactly. 我对如何准确地执行此操作有些迷惑。
2 个解决方案
解决方案1
1 已采纳 2017-03-16 13:55:46
This is called Message Flashing. 这称为消息闪烁。 The full documentation is here , and it's done by adding the messages on the view side and then rendering them on template like this: 完整的文档在这里 ，它是通过在视图侧添加消息，然后将其呈现在模板上来完成的，如下所示：
<!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 %}
解决方案2
0 2017-03-16 13:54:59
Checkout flash at http://flask.pocoo.org/docs/0.10/patterns/flashing/ . 在http://flask.pocoo.org/docs/0.10/patterns/flashing/上查看flash 。 That should do what you want. 那应该做你想要的。 Just handle the flash messages in the template for index ! 只需处理index模板中的Flash消息即可！
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