django-xadmin定制之分页显示数量

环境：xadmin-for-python3 python3.5.2 django1.9.12

主要思路：利用django-xadmin的插件原理和原有分页插件的逻辑，单独定义一个分页显示数插件，效果如下“每页”：

以下为相关代码：

1. 新建一个plugins/listperpage.py

from django.utils.safestring import mark_safe

import xadmin
from xadmin.views import BaseAdminPlugin
from django.template import loader
from django.utils.html import escape

class ListPerPagePlugin(BaseAdminPlugin):
    show_list_per_page = True
    list_per_page_choices = [20, 50, 100, 500]

    def init_request(self, *args, **kwargs):
        try:
            self.admin_view.list_per_page = int(self.request.GET.get('list_per_page', self.admin_view.list_per_page))
        except ValueError as e:
            print(repr(e))

        if self.admin_view.list_per_page>10000:
            self.admin_view.list_per_page = 10000 # 最大10000

        return bool(self.show_list_per_page)

    def get_context(self, context):
        list_per_page_range = []
        for per_page in self.list_per_page_choices:
            list_per_page_range.append(mark_safe('<a href="%s"%s><p class="text-left">%d</p></a> ' % (escape(self.get_query_string({'list_per_page': per_page})),
                                                    (per_page == self.admin_view.list_per_page and ' class="btn btn-sm disabled"' or ' class="btn btn-sm"'), per_page)))

        context.update({'list_per_page_range': list_per_page_range, 'list_per_page_required': (not self.admin_view.show_all or not self.admin_view.can_show_all) and self.admin_view.multi_page})
        return context

    # 对应model_list.html中的view_block 'bx_list_per_page'
    def block_bx_list_per_page(self, context, nodes):
       nodes.append(loader.render_to_string('base/blocks/bx_list_per_page.html', context_instance=context))

新建bx_list_per_page.html文件：

{% if list_per_page_required %}
<div class="dropdown" style="display:inline-block;">
    <button class="btn btn-default btn-sm dropdown-toggle" style="line-height:1.42" type="button" data-toggle="dropdown">每页
    <span class="caret"></span></button>
    <ul class="dropdown-menu">
      {% for num in list_per_page_range %}
          <li>{{ num }}</li>
      {% endfor %}
    </ul>
</div>
{% endif %}

2. 在合适的adminx.py中注册这个plugin， 注意这个adminx.py文件所在的app package必须是有配置在INSTALLED_APPS中：

from xadmin.views import ListAdminView
from .plugins.listperpage import ListPerPagePlugin
xadmin.site.register_plugin(ListPerPagePlugin, ListAdminView)

3. 更改djano-xadmin中的model_list.html文件，分页部分增加了

view_block 'bx_list_per_page' ：

<ul class="pagination pagination-sm pagination-left pagination-inline">
    {% view_block 'pagination' 'small' %}<li>{% view_block 'bx_list_per_page' %}</li>
  </ul>