Flash 消息未采用 bootstrap 样式

Question

首先感谢您的帮助。

我创建了一个小型 flask 网络应用程序来跟踪“待办事项”项目。作为应用程序的一部分，我添加了一些 flash 消息来帮助登录、注册等。我似乎将信息正确地提供给了浏览器，但是 bootstrap [=26= 的样式] 不只显示纯文本消息。

这是 flask 应用程序的基础 html。


<html>
    <head>
        <meta charset="utf-8">
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-EVSTQN3/azprG1Anm3QDgpJLIm9Nao0Yz1ztcQTwFspd3yD65VohhpuuCOmLASjC" crossorigin="anonymous">
        <link rel="stylesheet" type="text/css" href="{{ url_for('static', filename='ToDoList.css')}}" />
    
    </head>
    <body>
        <header class="site-header">
            <nav class="navbar navbar-expand-sm navbar-dark bg-steel fixed-top">
              <div class="container">
                <a class="navbar-brand mr-4" href="/">Just Do It Already</a>
                  <div class="navbar-nav ">
                    <a class="nav-item nav-link" href="{{ url_for('profile') }}">Profile</a>
                     {% if current_user.is_authenticated %}
                           <a class="nav-item nav-link" href="{{ url_for('logout') }}">Logout</a>
                           <a class="nav-item nav-link" href="{{ url_for('new_post') }}">New Task</a>
                     {% else %}
                            <a class="nav-item nav-link" href="{{ url_for('log_in') }}">Login</a> 
                            <a class="nav-item nav-link" href="{{ url_for('register') }}">Register</a>          
                    {% endif %}
                  </div>
                  </div>
              </div>
            </div>
            </nav>
          </header>
          <main role="main" class="container">
            <div class='row'>
              <div class="col-md-8 mx-auto">
                {% with messages = get_flashed_messages(with_categories=true) %}
                  {% if messages %}
                    {% for category, message in messages %}
                      <div class="alert alert-{{ category }}">
                        {{ message }}
                      </div>
                {% endfor %}
            {% endif %}
        {% endwith %}

        {% block body %}
        {% endblock %}
      </div>
      </div>
      </main>
      
    
    
        <script src="https://cdn.jsdelivr.net/npm/@popperjs/core@2.10.2/dist/umd/popper.min.js" integrity="sha384-7+zCNj/IqJ95wo16oMtfsKbZ9ccEh31eOz1HGyDuCQ6wgnyJNSYdrPa03rtR1zdB" crossorigin="anonymous"></script>
        <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/js/bootstrap.min.js" integrity="sha384-QJHtvGhmr9XOIpI6YVutG+2QOK9T+ZnN4kzFN1RtK3zEFEIsxhlmWl5/YESvpZ13" crossorigin="anonymous"></script>
    </body>
</html>

我的 flask 消息都包含 chrome 开发工具检查中显示的类别，只是消息没有样式。

知道我错过了什么吗？

Answer 1

bootstrap中没有alert-errorclass，需要用alert-danger或alert-warning。你可以看到所有选项 here

<div class="alert alert-primary" role="alert">
  A simple primary alert—check it out!
</div>
<div class="alert alert-secondary" role="alert">
  A simple secondary alert—check it out!
</div>
<div class="alert alert-success" role="alert">
  A simple success alert—check it out!
</div>
<div class="alert alert-danger" role="alert">
  A simple danger alert—check it out!
</div>
<div class="alert alert-warning" role="alert">
  A simple warning alert—check it out!
</div>
<div class="alert alert-info" role="alert">
  A simple info alert—check it out!
</div>
<div class="alert alert-light" role="alert">
  A simple light alert—check it out!
</div>
<div class="alert alert-dark" role="alert">
  A simple dark alert—check it out!
</div>

所以你的类别应该是danger或warning，例如：

flash('Login failed etc etc', 'danger')

Flash 消息未采用 bootstrap 样式

Flash messages not picking up bootstrap styling

python

frontend

flask

flash-message

twitter-bootstrap