python 分页

发布时间：2019-08-20 07:47:09编辑：auto阅读（1707）

    1、创建数据库信息

            class UserList(models.Model):
                username = models.CharField(max_length=32)
                age = models.IntegerField()

    2、创建URL

            from app01 import views
            urlpatterns = [
                url(r'^admin/', admin.site.urls),
                url(r'^user_list/', views.user_list),
            ]


    3、定义一个Pager类，处理页数换算

    class Pager(object):
        def __init__(self, current_page):
            self.current_page = int(current_page)

        @property
        def start(self):
            return (self.current_page - 1) * 10

        @property
        def end(self):
            return self.current_page * 10

        def page_str(self, all_item, base_url):
            all_page, div = divmod(all_item, 10)
            if div > 0:
                all_page += 1

            pager_list = []
            if all_page <= 11:
                start = 1
                end = all_page
            else:
                if self.current_page <= 6:
                    start = 1
                    end = 12
                else:
                    start = self.current_page - 5
                    end = self.current_page + 6
                    if self.current_page + 6 > all_page:
                        start = all_page - 11
                        end = all_page + 1

            for i in range(start, end):
                if i == self.current_page:
                    temp = '<a style="colo:red;font-size:26px;" href="%s%d">%d</a>' % (base_url, i, i,)
                else:
                    temp = '<a href="%s%d">%d</a>' % (base_url, i, i)
                pager_list.append(temp)

            # pre_next

            if self.current_page > 1:
                pre_page = '<a href="%s%d">pre_next</a>' % (base_url, self.current_page - 1)
            else:
                pre_page = '<a href="javascript:void(0);">pre_next</a>'
            # next
            if self.current_page >= all_page:
                next_page = '<a href="javascript:void(0);">next</a>'
            else:
                next_page = '<a href="%s%d">next</a>' % (base_url, self.current_page + 1)
            pager_list.insert(0, pre_page)
            pager_list.append(next_page)
            return mark_safe("".join(pager_list))

    4、创建视图 ，并导入上面创建的Pager类  

            def user_list(request):
                current_page=request.GET.get('page',1)
                page_obj = page.Pager(current_page)
                result = models.UserList.objects.all()[page_obj.start:page_obj.end]
                all_item = models.UserList.objects.all().count()
                pager_str = page_obj.page_str(all_item, "/user_list/?page=")
                return  render(request, 'user_list.html', {'result': result, 'pager_str': pager_str})

    5、创建前端user_list.html调用后台信息。

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title></title>
        <style>
            a{
                padding: 5px;
            }
        </style>
    </head>
    <body>
        <table>
            {% for line in result %}
            <tr>
                <td>` line`.`username `</td>
                <td>` line`.`age `</td>
            </tr>
            {% endfor %}

        </table>
        <div>
            {{ pager_str|safe }}
        </div>
    </body>
    </html>


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