Django 自定義分頁類

分頁類代碼：

class Page(object):
    '''
    自定義分頁類
    能夠實現Django ORM數據的的分頁展現
    輸出HTML代碼：

    使用說明：
    from utils import mypage
        page_obj = mypage.Page(total_num, current_page, 'publisher_list')
        publisher_list = data[page_obj.data_start:page_obj.data_end]
        page_html = page_obj.page_html()

        爲了顯示效果，show_page_num最好使用奇數
    '''

    def __init__(self, total_num, current_page, url_prefix, per_page=10, show_page_num=9):
        '''

        :param total_num: 數據總條數
        :param current_page: 當前訪問的頁碼
        :param url_prefix: 分頁代碼裏a標籤的前綴
        :param per_page: 每一頁顯示多少數據
        :param show_page_num: 頁面上最多顯示多少個頁碼


        '''
        self.total_num = total_num
        self.url_prefix = url_prefix
        self.per_page = per_page
        self.show_page_num = show_page_num
        # 根據傳入的值計算當前頁碼左右放置多少個頁碼
        self.half_show_page_num = self.show_page_num // 2
        # 計算當前數據總共須要多少頁碼
        total_page, more = divmod(self.total_num, self.per_page)
        # 若是有餘數就把頁碼加1
        if more:
            total_page += 1
        self.total_page = total_page
        # 數據有效性校驗
        try:
            current_page = int(current_page)
        except Exception as e:
            current_page = 1
        # 若是當前頁碼數大於總頁碼數，默認展現最後一頁數據
        if current_page > self.total_page:
            current_page = self.total_page
        # 若是當前頁碼小於1，默認展現第一頁數據
        if current_page < 1:
            current_page = 1
        self.current_page = current_page
        # 計算頁面上須要展現的頁碼範圍
        # 頁碼太小處理
        if self.current_page - self.half_show_page_num <= 1:
            page_start = 1
            page_end = show_page_num
        # 頁碼過大處理
        elif self.current_page + self.half_show_page_num >= self.total_page:
            page_end = self.total_page
            page_start = self.total_page - self.show_page_num + 1
        # 未超過正常範圍
        else:
            page_start = self.current_page - self.half_show_page_num
            page_end = self.current_page + self.half_show_page_num

        # 計算獲得的最終頁碼數
        self.page_start = page_start
        self.page_end = page_end
        # 若是計算獲得的頁碼數比總共須要展現頁碼數多，則把頁碼結束指定爲總頁碼數
        if self.page_end > self.total_page:
            self.page_end = self.total_page

    @property
    def data_start(self):
        '''

        :return: 返回當前頁面應該從哪裏開始切數據
        '''
        return (self.current_page - 1) * self.per_page

    @property
    def data_end(self):
        '''

        :return: 返回當前頁面從哪裏結束數據
        '''
        return self.current_page * self.per_page

    def page_html(self):
        li_list = []
        # 添加前面的nav和ul標籤
        li_list.append("""
        <nav aria-label="Page navigation">
        <ul class="pagination">
        """)
        # 添加首頁
        li_list.append('<li><a href="/{}/?page=1">首頁</a></li>'.format(self.url_prefix))
        # 添加上一頁
        if self.current_page <= 1:  # 沒有上一頁
            prev_html = '<li class="disabled"><a aria-label="Previous"><span aria-hidden="true">&laquo;</span></a></li>'
        else:
            prev_html = '<li><a href="/{}/?page={}" aria-label="Previous"><span aria-hidden="true">&laquo;</span></a></li>'.format(
                self.url_prefix,
                self.current_page - 1)
        li_list.append(prev_html)
        # 循環添加內部全部的頁碼
        for i in range(self.page_start, self.page_end + 1):
            if i == self.current_page:
                tmp = '<li class="active"><a href="/{0}/?page={1}">{1}</a></li>'.format(self.url_prefix, i)
            else:
                tmp = '<li><a href="/{0}/?page={1}">{1}</a></li>'.format(self.url_prefix, i)
            li_list.append(tmp)
        # 添加下一頁
        if self.current_page >= self.total_page:  # 表示沒有下一頁
            next_html = '<li class="disabled"><a aria-label="Previous"><span aria-hidden="true">&raquo;</span></a></li>'
        else:
            next_html = '<li><a href="/{}/?page={}" aria-label="Previous"><span aria-hidden="true">&raquo;</span></a></li>'.format(
                self.url_prefix, self.current_page + 1)
        li_list.append(next_html)
        # 添加尾頁
        li_list.append('<li><a href="/{}/?page={}">尾頁</a></li>'.format(self.url_prefix, self.total_page))
        # 添加結尾nav和ul標籤
        li_list.append("""
        </ul>
        </nav>
        """)
        # 將生成的標籤拼接成一個大字符串
        page_html = ''.join(li_list)
        return page_html


導入文件後調用代碼：

# 獲取分頁所需數據
total_num = data.count() # 獲取數據總計條數
current_page = request.GET.get('page') # 獲取當前頁頁碼
url_prefix = request.path_info.strip('/') # 獲取a標籤所需參數

# 調用分頁類# 調用類傳入參數生成實例page_obj = mypage.Page(total_num, current_page, url_prefix, per_page=1)# 按照分頁所需數據對總數據進行分割獲取當前頁面所需展現的數據data = data[page_obj.data_start:page_obj.data_end]# 獲取HTML代碼page_html = page_obj.page_html()