xppl/app/templates/show_books_grid.html

{% extends 'base.html' %}

{% block main %}
<div class="container">
  <h1 class="page-header">All Books</h1>
  {% with messages = get_flashed_messages() %}
    {% if messages %}
      <div class="alert alert-success">
        <ul>
        {% for message in messages %}
          <li>{{ message }}</li>
        {% endfor %}
        </ul>
      </div>
    {% endif %}
  {% endwith %}


        {% for book in books|sort(attribute='title', reverse = False) %}
<a href="books/{{ book.id }}">
<img class="no_cover" id="{{ book.title }}" src="../uploads/cover/{{ book.cover }}" width="140" onerror="if (this.src != '../static/img/default_cover.png') this.src = '../static/img/default_cover.png';"><!--{{ book.title }}--></a>


  {% endfor %}


</div>
{% endblock %}