flask flash消息闪现

来源：互联网发布：js array set 去重编辑：程序博客网时间：2024/04/29 20:08

test_flush.py

from flask import Flask, flash, redirect, render_template, request, url_forfrom flask_debugtoolbar import DebugToolbarExtensiondebugToolbar = DebugToolbarExtension()app = Flask(__name__, template_folder='../templates')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(message='You were successfully logged in.', category='error')            return redirect(url_for('index'))    return render_template('login.html', error=error)if __name__ == "__main__":    app.debug = True    debugToolbar.init_app(app)    app.run()

index.html

{% extends "layout.html" %}{% block body %}    <h1>Overview</h1>    <p>Do you want to <a href="{{ url_for('login') }}">log in?</a>{% endblock %}

layout.html

<!doctype html><title>My Application</title>{#{% with errors = get_flashed_messages(category_filter=["error"]) %}#}{% with messages = get_flashed_messages(with_categories=true) %}    {% if messages %}        <ul class=flashes>            {% for category, message in messages %}                <li>{{ category }}:{{ message }}</li>            {% endfor %}        </ul>    {% endif %}{% endwith %}{% block body %}{% endblock %}

{% 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></p>    </form>{% endblock %}

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