CRM customer relationship management system (5)

Chapter 5, paging function development

5.1. Modify BaseKingAdmin and improve the previous page display

Now accessing an unregistered model will report an error because list_display and list_filter are not written in the base class.

 

 Just set an empty list in the base class

# kingadmin / admin_base.py

class BaseKingAdmin(object):

    list_display = []
    list_filter = []
　　 search_fields = []

 Now there is no error in the access, but no data is displayed, you need to add a judgment in build_tab_row

 

kingadmin_tags.py

@register.simple_tag
 def build_table_row(obj,admin_class):
     ''' Generate a record html element '''

    ele = '' 
    if admin_class.list_display:
         for column_name in admin_class.list_display: #Get
             all field objects 
            column_obj = admin_class.model._meta.get_field(column_name) #choices
             method of field objects, if there are choices, get_xxx_display 
            if column_obj.choices :
                column_data = getattr(obj,'get_%s_display'%column_name)()
            else:
                column_data = getattr(obj,column_name)
            td_ele = "<td>%s</td>" % column_data
            he += td_ele
     else :
        td_ele = "<td>%s</td>"%obj
        he += all_he

 

 Add a judgment in table_obj_list.html

 

(2) Improve front-end page display

Configured list_display to display all column names, not configured should display model name

table_obj_lsit.html

<thead
                <tr>
                    {% if admin_class.list_display %}
                        {% for column in admin_class.list_display %}
                            <th>{{ column }}</th>
                        {% endfor %}
                    {% else %}
                        <th>{% get_model_name admin_class %}</th>
                    {% endif %}
                </tr>
            </thead>

kingadmin_tags.py

@register.simple_tag
def get_model_name(admin_class):
    '''获取表名'''
    return admin_class.model._meta.model_name.upper()

Front-end display effect

 

5.2. Paging function development

 Django official website paginationg instructions

 

 Official website example

 

 

 1）kingadmin/views.py

@login_required
 def table_obj_list(request, app_name, model_name):
     ''' Take out the data in the specified model and return it to the front end ''' 
    #After getting the admin_class, find the model through it 
    admin_class = site.enable_admins[app_name][model_name]
    querysets = admin_class.model.objects.all()
    #过滤
    querysets,filter_conditions = get_filter_result(request,querysets)
    admin_class.filter_conditions = filter_conditions
    #分页
    paginator = Paginator(querysets, 2)  
    page = request.GET.get('page')
    try:
        querysets = paginator.page(page)
    except PageNotAnInteger:
        querysets = paginator.page(1)
    except EmptyPage:
        querysets = paginator.page(paginator.num_pages)

    return render(request, 'kingadmin/table_obj_list.html',{'querysets':querysets,'admin_class':admin_class})

（2）table_obj_lsit.html

<div class="pagination">
            <span class="step-links">
                {% if querysets.has_previous %}
                    <a href="?page={{ querysets.previous_page_number }}">previous</a>
                {% endif %}

                <span class="current">
                    Page {{ querysets.number }} of {{ querysets.paginator.num_pages }}.
                </span>

                {% if querysets.has_next %}
                    <a href="?page={{ querysets.next_page_number }}">next</a>
                {% endif %}
            </span>
        </div>

At this time, when accessing the page, paging is indeed achieved, but clicking the next page will report an error

 

 

Because page='2' is used as a filter condition in the background, add a judgment

 kingadmin/views.py

 

5.3. Paging function optimization

      Bootstrap pagination component

 

 （1） kingadmin_tag.py

@register.simple_tag
def render_paginator(querysets):
    '''分页'''
    ele = '''
        <ul class="pagination">
    ''' 
    # page_range is all pages, querysets.number is the current page 
    for i in querysets.paginator.page_range:
         #Display three pages before and after, abs is the absolute value 
        if abs(querysets.number - i) < 3 :
            active = ''
            if querysets.number == i:     #如果是当前页,class='active'
                active = 'active'
            p_ele = '''<li class="%s"><a href="?page=%s">%s</a></li>'''%(active,i,i)
            he += p_he
    ele += "</ul>"
    return mark_safe(ele)

（2）table_obj_list.html

 

Effect:

 The code has been synchronized  'num5 to improve the front page display and paging function development'