netbox-community-netbox/netbox/templates/ipam/prefix_list.html

{% extends 'utilities/obj_list.html' %}
{% load helpers %}

{% block buttons %}
    <div class="btn-group" role="group">
        <div class="dropdown">
            <button class="btn btn-default dropdown-toggle" type="button" id="max_length" data-toggle="dropdown" aria-haspopup="true" aria-expanded="true">
                Max Length{% if "mask_length__lte" in request.GET %}: {{ request.GET.mask_length__lte }}{% endif %}
                <span class="caret"></span>
            </button>
            <ul class="dropdown-menu" aria-labelledby="max_length">
                {% for i in "4,8,12,16,20,24,28,32,40,48,56,64"|split %}
                    <li><a href="{% url 'ipam:prefix_list' %}{% querystring request mask_length__lte=i page=1 %}">
                        {{ i }} {% if request.GET.mask_length__lte == i %}<i class="fa fa-check"></i>{% endif %}
                    </a></li>
                {% endfor %}
            </ul>
        </div>
    </div>
{% endblock %}