测开之路一百三十六：错误消息闪回提示

错误消息提示：flask.flash

视图

app.secret_key = ‘qoihf2397r21380r2/./ad‘  # 加密的安全码，越复杂越好，flask后台自动进行加密

@app.route(‘/login/‘, methods=[‘GET‘, ‘POST‘])def login():    """ 登录 """    if request.method == ‘POST‘:        username = request.form.get(‘username‘)        password = request.form.get(‘password‘)        sql = ‘select count(*) as [Count] from UserInfo where username = ? and password = ?‘        result = query_sql(sql, (username, password), True)        if int(result.get(‘Count‘)) > 0:            return redirect(url_for(‘list‘))        flash(‘用户名或密码错误‘)    return render_template(‘login.html‘)

login.html

{% extends ‘base.html‘ %}

{% block main_content %}

<!--登录界面--><div class="row">    <div class="col-md-6 col-md-offset-3">        <div class="panel panel-default">            <div class="panel-heading">                <h4>登录</h4>            </div>            <div class="panel-body">                <form action="#" class="form-horizontal" method="post">                    <div class="col-md-10 col-md-offset-1">                        <!--错误消息闪现-->                        {% with messages = get_flashed_messages() %}<!-- 获取flash返回的消息，语法由jinja2提供 -->                            {% if messages %}                                {% for msg in messages %}                                    <div class="alert alert-warning">                                        <a href="#" class="close" data-dismiss="alert">&times;</a>                                        {{ msg }}                                    </div>                                {% endfor %}                            {% endif %}                        {% endwith %}                        <div class="form-group">                            <label for="username" class="col-md-3">用户名：</label>                            <div class="col-md-7">                                <input type="text" class="form-control" name="username" id="username">                            </div>                        </div>                        <div class="form-group">                            <label for="password" class="col-md-3">密码：</label>                            <div class="col-md-7">                                <input type="text" class="form-control" name="password" id="password">                            </div>                        </div>                        <div class="form-group">                            <div class="col-md-10 col-md-offset-3">                                <input type="submit" class="btn btn-primary" value="登录">                            </div>                        </div>                    </div>

                </form>            </div>            <div class="footer">                &copy;版权所有            </div>        </div>    </div></div>

{% endblock %}

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原文地址：https://www.cnblogs.com/zhongyehai/p/11462468.html