Python CRM项目三

1.分页:

分页使用Django内置的分页模块来实现

官方的分页案例

 from django.core.paginator import Paginator, EmptyPage, PageNotAnInteger

 from django.shortcuts import render

 #后端

 def listing(request):

     contact_list = Contacts.objects.all()

     paginator = Paginator(contact_list, 25) # Show 25 contacts per page

     page = request.GET.get('page')

     try:

         contacts = paginator.page(page)

     except PageNotAnInteger:

         # If page is not an integer, deliver first page.

         contacts = paginator.page(1)

     except EmptyPage:

         # If page is out of range (e.g. 9999), deliver last page of results.

         contacts = paginator.page(paginator.num_pages)

     return render(request, 'list.html', {'contacts': contacts})

 #前端

 % for contact in contacts %}

     {# Each "contact" is a Contact model object. #}

     {{ contact.full_name|upper }}<br />

     ...

 {% endfor %}

 #分页组件

 <div class="pagination">

     <span class="step-links">

         {% if contacts.has_previous %}

             <a href="?page={{ contacts.previous_page_number }}">previous</a>

         {% endif %}

         <span class="current">

             Page {{ contacts.number }} of {{ contacts.paginator.num_pages }}.

         </span>

         {% if contacts.has_next %}

             <a href="?page={{ contacts.next_page_number }}">next</a>

         {% endif %}

     </span>

 </div>

在项目中由于分页之前要进行条件筛选和排序,所以分页如下

 from django.core.paginator import Paginator,EmptyPage, PageNotAnInteger

def table_filter(request,admin_class):

    '''进行条件过滤,并返回过滤后的数据和条件'''

    filter_condition = {}

    for k,v in request.GET.items():

        if v:

            filter_condition[k]=v

    return admin_class.model.objects.filter(**filter_condition),filter_condition

 def display_table_objs(request,app_name,table_name):

     admin_class = king_admin.enabled_admins[app_name][table_name]

     #有后端查询出结果集和条件,并对其进行分页操作

     object_list,filter_conditions = table_filter(request,admin_class)

     paginator = Paginator(object_list, admin_class.list_per_page)

     page = request.GET.get('page')

     try:

         objects = paginator.page(page)

     except PageNotAnInteger:

         objects = paginator.page(1)

     except EmptyPage:

         objects = paginator.page(paginator.num_pages)

     return render(request,'king_admin/table_objs.html',{'admin_class':admin_class,

                                                         'query_sets':objects,

                                                         'filter_conditions':filter_conditions})

 {% block container %}

     <div class="panel panel-info">

         <div class="panel-heading">

             <h3 class="panel-title">Panel title</h3>

         </div>

         <div class="panel-body">

             <div class="row">

 {#            <!--将筛选提交提交到后台进行查询--!>#}

                 <form method="get">

                     {% for condition in admin_class.list_filters %}

                         <div class="col-lg-2">

                             <span>{{  condition }}</span>

                             #后台通过条件,数据类,所选条件进行提取结果集

                             {% render_filter_ele condition admin_class filter_conditions %}

                         </div>

                     {% endfor %}

                     <div class="col-lg-2">

                         <input type="submit" class="btn btn-info" style="margin-top:20px">

                     </div>

                 </form>

             </div>

         {#            <!--动态展示后端的表格--!>#}

             <table class="table table-hover">

                 <thead>

                     <tr>

                         {% for column in admin_class.list_display %}

                             <th>{{ column }}</th>

                         {% endfor %}

                     </tr>

                 </thead>

                 <tbody>

 {#            <!--动态展示后端的表格中的数据--!>#}

                     {% for obj in query_sets %}

                         <tr>

                             {% bulid_table_row obj admin_class %}

                         </tr>

                     {% endfor %}

                 </tbody>

             </table>

         {#            <!--分页--!>#}

             <nav aria-label="...">

               <ul class="pagination">

                   {% if query_sets.has_previous %}

                      <li><a href="?page={{ query_sets.previous_page_number }}">上一页</a></li>

                   {% endif %}

                   {% for loop_counter in query_sets.paginator.page_range %}

                     {% render_page_ele loop_counter query_sets %}

                   {% endfor %}

                   {% if query_sets.has_next %}

                      <li><a href="?page={{ query_sets.next_page_number }}">下一页</a></li>

                   {% endif %}

               </ul>

             </nav>

         </div>

     </div>

 {% endblock %}

自定义标签的tags的方法

1.导入

 from django import template

 from django.utils.safestring import mark_safe

 register = template.Library()

2.动态加载表格 render_app_name

 @register.simple_tag

 def render_app_name(admin_class):

     '''渲染动态获取表名'''

     return admin_class.model._meta.verbose_name_plural

3.动态展示表格中的数据 build_table_row

 @register.simple_tag

 def bulid_table_row(obj,admin_class):

     '''生成数据内容的td,填充到table中,展示前端'''

     row_ele = ''

     for column in admin_class.list_display:

         #获取每个字段的类型的对象

         field_obj = obj._meta.get_field(column)

         #判断是否是choice字段

         if field_obj.choices:

             #如果是choice字段,则按照choice的值进行展示

             column_data = getattr(obj,"get_%s_display"%column)()

         else:

             #否则通过反射去对象中取值

             column_data = getattr(obj,column)

         if type(column_data).__name__ == 'datetime':

             #如果是时间类型,则需要进行格式化显示

             column_data = column_data.strftime('%Y-%m-%d %H:%M:%S')

         row_ele += '<td>%s</td>'%column_data

     return mark_safe(row_ele)

4.动态进行分页参数的切割 render_page_ele

 @register.simple_tag

 def render_page_ele(loop_counter,query_sets):

     #如果当前页数-循环的次数小于1,就展示前面两页和后面两页

     #例如当前是第五页则展示3,4,5,6,7页

     if abs(query_sets.number-loop_counter)<=1:

         ele_class = ''

         if query_sets.number==loop_counter:

             ele_class = 'active'

         ele= '<li class="%s"><a href="?page=%s">%s</a></li>'%(ele_class,loop_counter,loop_counter)

         return mark_safe(ele)

     return ''

5.动态加载筛选条件 render_filter_ele

 @register.simple_tag

 def render_filter_ele(condition,admin_class,filter_conditions):

     select_ele = '<select class="form-control" name="%s"><option value="">----</option>'%condition

     field_obj = admin_class.model._meta.get_field(condition)

     selected = ''

     if field_obj.choices:

         #choice字段的值的获取

         for choice_item in field_obj.choices:

             if filter_conditions.get(condition) == str(choice_item[0]):

                 selected = 'selected'

             select_ele += '<option value="%s" %s>%s</option>'%(choice_item[0],selected,choice_item[1])

             selected = ''

     if type(field_obj).__name__=='ForeignKey':

         #外键字段的获取

         for choice_item in field_obj.get_choices()[1:]:

             if filter_conditions.get(condition) == str(choice_item[0]):

                 selected = 'selected'

             select_ele += '<option value="%s" %s>%s</option>' % (choice_item[0], selected,choice_item[1])

             selected = ''

     select_ele+='</select>'

     return mark_safe(select_ele)

当然,上述的代码会导致错误,这是必然发生的,因为我们没有和之后的过滤,排序结合起来,目前只用了分页,所以比较片面,后面还需在功能上进行优化

6.条件过滤

思路:前端传入过滤条件,后端组合成字典,同时过滤掉分页关键字和排序关键字,再将条件封装成字典,按条件查询即可

 def table_filter(request,admin_class):

     '''进行条件过滤,并返回过滤后的数据'''

     filter_condition = {}

     for k,v in request.GET.items():

         #page为分页的字段,o为排序关键字,不是数据库的查询字段,此处要进行过滤

         if k == 'page' or k == 'o':

             continue

         if v:

             filter_condition[k]=v

     return admin_class.model.objects.filter(**filter_condition),filter_condition

7.单条件排序

思路:将前端传入的排序字段,后台拿到排序的关键字进行排序,排序分为正向排序和逆向排序

 def table_sort(request,objs):

     #获取前端的分页关键字进行排序

     orderby_key = request.GET.get('o')

     if orderby_key:

         res = objs.order_by(orderby_key)

         #如果上一次是降序,此时改成升序

         if orderby_key.startswith('-'):

             orderby_key = orderby_key.strip('-')

         else:

             #否则改成降序

             orderby_key = '-%s'%orderby_key

     else:

         res = objs

     return res,orderby_key

8.views修改,分页中集成筛选和排序

 def display_table_objs(request,app_name,table_name):

     admin_class = king_admin.enabled_admins[app_name][table_name]

     #有后端查询出结果集,并对其进行分页操作

     object_list,filter_conditions = table_filter(request,admin_class)

     #先过滤,在排序

     object_list,orderby_key = table_sort(request,object_list)

     paginator = Paginator(object_list, admin_class.list_per_page)

     page = request.GET.get('page')

     try:

         objects = paginator.page(page)

     except PageNotAnInteger:

         objects = paginator.page(1)

     except EmptyPage:

         objects = paginator.page(paginator.num_pages)

     #传递给前端的参数有model的admin_class,分页的结果集,过滤条件,排序字段,以及上一次的排序字段

     return render(request,'king_admin/table_objs.html',{'admin_class':admin_class,

                                                         'query_sets':objects,

                                                         'filter_conditions':filter_conditions,

                                                         'orderby_key':orderby_key,

                                                         'previous_orderby':request.GET.get('o') or ''})

9.tags自定义标签渲染

9.1 筛选条件

 @register.simple_tag

 def render_filter_ele(condition,admin_class,filter_conditions):

     #渲染过滤筛选的条件,返回给前端渲染

     select_ele = '<select class="form-control" name="%s"><option value="">----</option>'%condition

     field_obj = admin_class.model._meta.get_field(condition)

     selected = ''

     if field_obj.choices:

         #choice字段的值的获取

         for choice_item in field_obj.choices:

             if filter_conditions.get(condition) == str(choice_item[0]):

                 selected = 'selected'

             select_ele += '<option value="%s" %s>%s</option>'%(choice_item[0],selected,choice_item[1])

             selected = ''

     if type(field_obj).__name__=='ForeignKey':

         #外键字段的获取

         for choice_item in field_obj.get_choices()[1:]:

             if filter_conditions.get(condition) == str(choice_item[0]):

                 selected = 'selected'

             select_ele += '<option value="%s" %s>%s</option>' % (choice_item[0], selected,choice_item[1])

             selected = ''

     select_ele+='</select>'

     return mark_safe(select_ele)

9.2 排序关键字

 @register.simple_tag

 def build_table_header_column(column,orderby_key,filter_condition):

     #排序时要携带过滤条件

     filters = ''

     for k,v in filter_condition.items():

         filters += '&%s=%s'%(k,v)

     ele = '<th><a href="?{filters}&o={orderby_key}">{column}</a>{sort_icon}</th>'

     if orderby_key:

         if orderby_key.startswith('-'):

             sort_icon = '<span class="glyphicon glyphicon-chevron-up"></span>'

         else:

             sort_icon = '<span class="glyphicon glyphicon-chevron-down"></span>'

         if orderby_key.strip('-') == column: #排序的就是当前字段

             orderby_key = orderby_key

         else:

             orderby_key = column

             sort_icon = ''

     else:#没有排序,就默认按照当前列显示

         orderby_key = column

         sort_icon = ''

     return mark_safe(ele.format(orderby_key=orderby_key,column=column,sort_icon=sort_icon,filters=filters))

9.3 分页bug修复

 @register.simple_tag

 def build_paginations(query_sets,filter_conditions,previous_orderby):

     '''返回整个的分页元素'''

     filters = ''

     for k, v in filter_conditions.items():

         filters += '&%s=%s' % (k, v)

     page_btns = ''

     added_dot_ele = False

     for page_num in query_sets.paginator.page_range:

         #代表最前2页,或最后2页

         if page_num < 3 or page_num > query_sets.paginator.num_pages-2 or \

                         abs(query_sets.number - page_num) <= 1:

             ele_class = ''

             if query_sets.number == page_num:

                 ele_class = 'active'

                 added_dot_ele = False

             page_btns += '<li class="%s"><a href="?page=%s%s&o=%s">%s</a></li>' % (ele_class, page_num, filters,previous_orderby, page_num)

         else:

             if not added_dot_ele:#现在还没有加...

                 page_btns += '<li><a>...</a></li>'

                 added_dot_ele = True

     return mark_safe(page_btns)

10 前端页面修改

 {% extends 'king_admin/table_index.html' %}

 {% load tags %}

 {% block container %}

     <div class="panel panel-info">

         <div class="panel-heading">

             <h3 class="panel-title">Panel title</h3>

         </div>

         <div class="panel-body">

             <div class="row">

 {#            <!--将筛选提交提交到后台进行查询--!>#}

                 <form method="get">

                     {% for condition in admin_class.list_filters %}

                         <div class="col-lg-2">

                             <span>{{  condition }}</span>

 {#                            后台通过条件,数据类,所选条件进行提取结果集#}

                             {% render_filter_ele condition admin_class filter_conditions %}

                         </div>

                     {% endfor %}

                     <div class="col-lg-2">

                         <input type="submit" class="btn btn-info" style="margin-top:20px">

                     </div>

                 </form>

             </div>

         {#            <!--动态展示后端的表格--!>#}

             <table class="table table-hover">

                 <thead>

                     <tr>

                         {% for column in admin_class.list_display %}

 {#                            动态展示表格中的数据,排序关键字,和筛选条件#}

                             {% build_table_header_column column orderby_key filter_conditions %}

                         {% endfor %}

                     </tr>

                 </thead>

                 <tbody>

 {#            <!--动态展示后端的表格中的数据--!>#}

                     {% for obj in query_sets %}

                         <tr>

                             {% bulid_table_row obj admin_class %}

                         </tr>

                     {% endfor %}

                 </tbody>

             </table>

             <p>总计:{{ query_sets.paginator.count }}条</p>

         {#            <!--分页--!>#}

             <nav aria-label="...">

               <ul class="pagination">

                   {% if query_sets.has_previous %}

                      <li><a href="?page={{ query_sets.previous_page_number }}">上一页</a></li>

                   {% endif %}

                   {% build_paginations query_sets filter_conditions previous_orderby %}

                   {% if query_sets.has_next %}

                      <li><a href="?page={{ query_sets.next_page_number }}">下一页</a></li>

                   {% endif %}

               </ul>

             </nav>

         </div>

     </div>

 {% endblock %}

11 排序

后台处理

 def table_sort(request,objs):

     #获取前端的分页关键字进行排序

     orderby_key = request.GET.get('o')

     if orderby_key:

         res = objs.order_by(orderby_key)

         if orderby_key.startswith('-'):

             orderby_key = orderby_key.strip('-')

         else:

             orderby_key = '-%s'%orderby_key

     else:

         res = objs

     return res,orderby_key

tags动态生成标签和触发正序和倒序

 @register.simple_tag

 def build_table_header_column(column,orderby_key,filter_condition):

     filters = ''

     for k,v in filter_condition.items():

         filters += '&%s=%s'%(k,v)

     #生成每一列表头的超链接,点击触发排序

     ele = '<th><a href="?{filters}&o={orderby_key}">{column}</a>{sort_icon}</th>'

     if orderby_key:

         if orderby_key.startswith('-'):

             sort_icon = '<span class="glyphicon glyphicon-chevron-up"></span>'

         else:

             sort_icon = '<span class="glyphicon glyphicon-chevron-down"></span>'

         if orderby_key.strip('-') == column: #排序的就是当前字段

             orderby_key = orderby_key

         else:

             orderby_key = column

             sort_icon = ''

     else:#没有排序,

         orderby_key = column

         sort_icon = ''

     return mark_safe(ele.format(orderby_key=orderby_key,column=column,sort_icon=sort_icon,filters=filters))

12 查找

后台处理

 def table_search(request,admin_class,object_list):

     search_key = request.GET.get('_q','')

     con = Q()

     con.connector = 'OR'

     for search_field in admin_class.search_fields:

         con.children.append(('%s__contains'%search_field,search_key))

     res = object_list.filter(con)

     return res

原先代码修改

 def table_filter(request,admin_class):

     '''进行条件过滤,并返回过滤后的数据'''

     filter_condition = {}

     # page为分页的字段,o为排序关键字,_q是搜索关键字,不是数据库的查询字段,此处要进行过滤

     keywords = ['page','o','_q']

     for k,v in request.GET.items():

         if k in keywords:

             continue

         if v:

             filter_condition[k]=v

     return admin_class.model.objects.filter(**filter_condition),filter_condition

在views中导入utils的查找方法

 def display_table_objs(request,app_name,table_name):

     admin_class = king_admin.enabled_admins[app_name][table_name]

     #有后端查询出结果集,并对其进行分页操作

     object_list,filter_conditions = table_filter(request,admin_class)

     #搜索

     object_list = table_search(request,admin_class,object_list)

     #先过滤,在排序

     object_list,orderby_key = table_sort(request,object_list)

     paginator = Paginator(object_list, admin_class.list_per_page)

     page = request.GET.get('page')

     try:

         objects = paginator.page(page)

     except PageNotAnInteger:

         objects = paginator.page(1)

     except EmptyPage:

         objects = paginator.page(paginator.num_pages)

     return render(request,'king_admin/table_objs.html',{'admin_class':admin_class,

                                                        'query_sets':objects,

                                                         'filter_conditions':filter_conditions,

                                                         'orderby_key':orderby_key,

                                                         'previous_orderby':request.GET.get('o') or '',

                                                         'search_text':request.GET.get('_q') or ''})

前端

 <div class="row">

                         <div class="col-lg-2">

                             <input type="search" name="_q" style="margin-left:15px" class="form-control" value="{{ search_text }}">

                         </div>

                         <div class="col-lg-2">

                             <button type="submit" class="btn btn-info">搜索</button>

                         </div>

                     </div>

13 时间检索

 @register.simple_tag

 def render_filter_ele(condition,admin_class,filter_conditions):

     select_ele = '<select class="form-control" name="{condition}"><option value="">----</option>'

     field_obj = admin_class.model._meta.get_field(condition)

     selected = ''

     if field_obj.choices:

         #choice字段的值的获取

         for choice_item in field_obj.choices:

             if filter_conditions.get(condition) == str(choice_item[0]):

                 selected = 'selected'

             select_ele += '<option value="%s" %s>%s</option>'%(choice_item[0],selected,choice_item[1])

             selected = ''

     if type(field_obj).__name__=='ForeignKey':

         #外键字段的获取

         for choice_item in field_obj.get_choices()[1:]:

             if filter_conditions.get(condition) == str(choice_item[0]):

                 selected = 'selected'

             select_ele += '<option value="%s" %s>%s</option>' % (choice_item[0], selected,choice_item[1])

             selected = ''

     if type(field_obj).__name__ in ['DateTimeField','DateField']:

         #日期字段获取,通过计算当前时间-天数来实现日期过滤

         date_els = []

         today_ele = datetime.now().date()

         date_els.append(['今天',today_ele])

         date_els.append(['昨天',today_ele - timedelta(days=1)])

         date_els.append(['近7天', today_ele - timedelta(days=7)])

         date_els.append(['本月', today_ele.replace(day=1)])

         date_els.append(['近30天', today_ele - timedelta(days=30)])

         date_els.append(['近90天', today_ele - timedelta(days=90)])

         date_els.append(['近180天', today_ele - timedelta(days=180)])

         date_els.append(['本年', today_ele.replace(month=1,day=1)])

         date_els.append(['近一年', today_ele - timedelta(days=365)])

         selected = ''

         for date in date_els:

             select_ele += '<option value="%s" %s>%s</option>'%(date[1],selected,date[0])

         filter_field_name = '%s__gte'%condition

     else:

         filter_field_name = condition

     select_ele+='</select>'

     select_ele=select_ele.format(condition=filter_field_name)

     return mark_safe(select_ele)

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