将标记变量转换为Django模板中的HTML类(或div)名称

<!-- 使用if标签 -->
<div {% if is_active %}class="active"{% endif %}>
    Content
</div>

<!-- 使用add_class过滤器 -->
<div class="{{ is_active|yesno:'active,' }}">
    Content
</div>

<div class="base-class {% if is_active %}active{% endif %} {% if is_featured %}featured{% endif %}">
    Content
</div>

<!-- 不安全的做法 -->
<div class="{{ user_input|safe }}">Content</div>

<!-- 安全的做法 -->
<div class="{{ user_input }}">Content</div>

# views.py
def my_view(request):
    is_active = True
    is_featured = False
    classes = 'base-class'
    if is_active:
        classes += ' active'
    if is_featured:
        classes += ' featured'
    return render(request, 'my_template.html', {'classes': classes})

<div class="{{ classes }}">
    Content
</div>