Django--分页

功能

web分页


使用

在项目中创建一个分页的class，web用到分页的地方直接用下面的function调用即可。


速查

class
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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)  #计算分页数量，每页显示10条数据，div是余数
        if div >0 :
            all_page += 1
        pager_list = [] #先定义成列表，最后再join成字符串传给前端
        if all_page <=11:   #计算start和end
            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): #生成分页的html标签，当前页变红变大显示
            if i == self.current_page:
                temp = '<a style="color: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)
 
        #上一页
        if self.current_page>1: #href到当前页的上一个数字
            pre_page = '<a href="%s%d">上一页</a>' %(base_url,self.current_page-1)
        else:
            pre_page = '<a href="javascript:void(0)">上一页</a>'   #href什么也不做
        #下一页
        if self.current_page >= all_page:
            next_page = '<a href="javascript:void(0)">下一页</a>'
        else:
            next_page = '<a href="%s%d">下一页</a>'%(base_url,self.current_page+1)
        pager_list.insert(0,pre_page)
        pager_list.append(next_page)
 
        #首页
        if self.current_page == 1:
            home_page = '<a href="javascript:void(0)">首页</a>'
        else:
            home_page = '<a href="%s%d">首页</a>'%(base_url,1)
        #尾页
        if self.current_page == all_page:
            last_page = '<a href="javascript:void(0)">尾页</a>'
        else:
            last_page = '<a href="%s%d">尾页</a>'%(base_url,all_page)
        pager_list.insert(0,home_page)
        pager_list.append(last_page)
 
        #最终html字符串
        return mark_safe("".join(pager_list))
function
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def user_list(request):
    current_page = request.GET.get('page',1)
    page_obj = 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})


知识点

1、只取数据库表的前10条
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models.UserList.objects.all()[0:10]
2、分页是起始数和结束数
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start = (current_page-1)*10
end = current_page*10
3、类的静态方法，不用加括号调用
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class pager():
    @property
    def start(self):
        return (self.current_page-1) * 10
 
page_obj.start    #==>直接得到结果
4、计算分页数
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all_item = models.UserList.objects.all().count()
all_page,div = divmod(all_item,10)
    if div >0 :
        all_page += 1
5、a标签点击什么也不做
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<a href="javascript:void(0)">无效标签</a>
6、字符串和列表拼接成html标签
字符串：
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html += str
列表：
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list.insert(0,A)  --开头插入
list.append(A)    --末尾插入
html = "".join(list)
7、xss字符串安全
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from django.utils.safestring import mark_safe
return mark_safe(html_str)


详细步骤

参照：d22page项目及video​













posted @ 2016-04-08 16:03  大亮头  阅读(234)  评论(0)    收藏  举报