權限組件（4）：給動態菜單增長麪包屑導航

效果圖：

 

1、在初始化權限的時候增長二級菜單的標題和url

這麼作是爲了在中間件中把二級菜單和具體權限的標題、url都儲存起來
rbac/service/init_permission.py

from permission_learn import settings def init_permission(current_user, request): """ 用戶權限的初始化 :param current_user: 當前登陸用戶 :param request: :return: """ permission_menu_queryset = current_user.roles.filter(permissions__isnull=False).values( 'permissions__id', 'permissions__title', 'permissions__url', 'permissions__pid_id', 'permissions__pid__title',  # +
        'permissions__pid__url',    # + 
        'permissions__menu_id', 'permissions__menu__title', 'permissions__menu__icon', ) permission_list = [] menu_dict = {} for item in permission_menu_queryset: permission_list.append({ 'id': item['permissions__id'], 'title': item['permissions__title'], 'url': item['permissions__url'], 'pid': item['permissions__pid_id'],  # + 
            'p_title': item['permissions__pid__title'],    # +
            'p_url': item['permissions__pid__url'], }) menu_id = item['permissions__menu_id'] if not menu_id: continue second_menu = {'id': item["permissions__id"], 'title': item['permissions__title'], 'url': item['permissions__url']} if menu_id in menu_dict: menu_dict[menu_id]['second_menu'].append(second_menu) else: menu_dict[menu_id] = { 'title': item['permissions__menu__title'], 'icon': item['permissions__menu__icon'], 'second_menu': [second_menu, ] } request.session[settings.PERMISSION_SESSION_KEY] = permission_list request.session[settings.MENU_SESSION_KEY] = menu_dict

2、中間件處理

rbac/middlewares/rbac.py

import re from django.utils.deprecation import MiddlewareMixin from django.shortcuts import HttpResponse from permission_learn import settings class RbacMiddleware(MiddlewareMixin): def process_request(self, request): white_list = settings.WHITE_LIST current_path = request.path for valid_url in white_list: if re.match(valid_url, current_path): return None permission_list = request.session.get(settings.PERMISSION_SESSION_KEY) if not permission_list: return HttpResponse('請先登陸 ') has_permission = False url_record = [ {'title': '首頁', 'url': '#'} ] for item in permission_list: regex = '^%s$' % item['url'] if re.match(regex, current_path): has_permission = True request.current_selected_permission = item['pid'] or item['id'] if not item['pid']:  # 選中的是二級菜單,這時候是沒有pid的，因此就沒有p_title
 url_record.extend([ {'title': item['title'], 'url': item['url'], 'class': 'active'} ]) else:  # 選中的是具體權限，有pid和p_title。給具體權限加上class。
 url_record.extend([ {'title': item['p_title'], 'url': item['p_url']}, {'title': item['title'], 'url': item['url'], 'class': 'active'}, ]) request.breadcrumb = url_record  # 經過request，把儲存信息傳給用戶
                break

        if not has_permission: return HttpResponse('未獲取權限')

 注意：

• 選中的是二級菜單時,只要給列表加上二級菜單就標題和url就能夠，這時候是沒有pid和p_title的。直接給二級菜單加上class就能夠。
• 選中具體權限時，它是有pid的，要給列表加上二級菜單的標題和url。給具體權限加上class

class在頁面會顯示灰色效果。

 

3、模板處理

rbac/templatestag/rbac.py

import re from collections import OrderedDict from django.conf import settings from django.template import Library register = Library() @register.inclusion_tag('rbac/breadcrumb.html') def breadcrumb(request): return {'record_list': request.breadcrumb}

 

rbac/templates/rbac/breadcrumb.html

<div>
    <ol class="breadcrumb no-radius no-margin" style="border-bottom:1px solid #ddd"> {% for item in record_list %} {% if item.class %} <li class="{{ item.class }}">{{ item.title }}</li> {% else %} <li><a href="{{ item.url }}">{{ item.title }}</a></li> {% endif %} {% endfor %} </ol>
</div>

若是有class，就說明是被用戶選中的二級菜單或url，反之，就給一個能夠點擊的a標籤

 

在layout.html頁面引入麪包屑導航

<div class="right-body"> {% breadcrumb request %} <!-- + --> {% block content %} {% endblock %} </div>