Django自定義分頁並保存搜索條件

Django自定義分頁並保存搜索條件

1、自定義分頁組件pagination.py

import copy


class Pagination:
    def __init__(self, current_page_num, all_count, request, per_page_num=10, page_count=11):
        """
        封裝分頁相關數據
        :param current_page_num: 當前頁碼數
        :param all_count: 資料庫中總數據條數
        :param per_page_num: 每頁顯示的數據量
        :param page_count: 最大顯示頁數
        """

        try:
            current_page = int(current_page_num)
        except Exception as e:
            current_page = 1

        # 頁碼數小於1時顯示第一頁
        if current_page < 1:
            current_page = 1

        # 取總頁碼數
        self.all_page_count, temp = divmod(all_count, per_page_num)
        if temp:
            self.all_page_count += 1

        # 頁碼數大於最大頁碼數時顯示最後一頁
        if current_page > self.all_page_count:
            current_page = self.all_page_count

        self.current_page = current_page
        self.per_page_num = per_page_num
        self.half_page_count = int((page_count - 1) / 2)

        # 總頁碼數小於最大頁碼數
        if self.all_page_count < page_count:
            self.start_page = 1
            self.end_page = self.all_page_count + 1
        else:
            if self.current_page < self.half_page_count:
                # 當頁碼條數據靠近最左邊時
                self.start_page = 1
                self.end_page = page_count + 1
            elif self.all_page_count - self.current_page < self.half_page_count:
                # 當頁碼條數據靠近最右邊時
                self.start_page = self.all_page_count - page_count + 1
                self.end_page = self.all_page_count + 1
            else:
                # 頁碼條正常顯示在中間位置
                self.start_page = self.current_page - self.half_page_count
                self.end_page = self.current_page + self.half_page_count + 1

        # 獲取get參數: <QueryDict:{key: value}>
        params = request.GET
        # 不進行deepcopy將無法改變其裡面的值
        self.new_params = copy.deepcopy(params)

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

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

    def show_html(self):
        html_list = []
        if self.current_page == 1:
            first_page = '<li class="disabled"><a>{0}</a></li>'.format('首頁')

        else:
            # 將page傳入new-params中
            self.new_params['page'] = 1
            # 對new_params進行urlencode格式化: 'key=value&key2=value2&page=1'
            first_page = '<li><a href="?{0}">{1}</a></li>'.format(self.new_params.urlencode(), '首頁')
        # 將"首頁"html代碼加入html_list中
        html_list.append(first_page)

        if self.current_page == 1:
            prev_page = '<li class="disabled"><a>{0}</a></li>'.format('&laquo;')
        else:
            self.new_params['page'] = self.current_page - 1
            prev_page = '<li><a href="?{0}">{1}</a></li>'.format(self.new_params.urlencode(), '&laquo;')

        # 將"上一頁"html代碼加入html_list中
        html_list.append(prev_page)

        for i in range(self.start_page, self.end_page):
            if self.current_page == i:
                page_bar = '<li class="active"><a>{0}</a></li>'.format(i)
            else:
                self.new_params['page'] = i
                page_bar = '<li><a href="?{0}">{1}</a></li>'.format(self.new_params.urlencode(), i)

            # 將"每一頁"html代碼加入html_list中
            html_list.append(page_bar)

        if self.current_page == self.all_page_count:
            next_page = '<li class="disabled"><a>{0}</a></li>'.format('&raquo;')
        else:
            self.new_params['page'] = self.current_page + 1
            next_page = '<li><a href="?{0}">{1}</a></li>'.format(self.new_params.urlencode(), '&raquo;')

        # 將"下一頁"html代碼加入html_list中
        html_list.append(next_page)

        if self.current_page == self.all_page_count:
            last_page = '<li class="disabled"><a>{0}</a></li>'.format('尾頁')
        else:
            self.new_params['page'] = self.all_page_count
            last_page = '<li><a href="?{0}">{1}</a></li>'.format(self.new_params.urlencode(), '尾頁')

        # 將"尾頁"html代碼加入到html_list中
        html_list.append(last_page)

        return ''.join(html_list)

2、view視圖

class CustomerView(View):
    def get(self, request):
        customer_list = Customer.objects.all()
        page = request.GET.get('page')
        # 實例化pagination對象
        pagination = Pagination(page, customer_list.count(), request, per_page_num=1)
        # 對數據列表進行分頁
        customer_list = customer_list[pagination.start:pagination.end]
        context = {
            'customer_list': customer_list,
            'page_html': pagination.show_html()
        }
        return render(request, 'customer_list.html', context)

    def post(self, request):
        pass

3、templates模板

<nav aria-label="Page navigation" class="pull-right">
    <ul class="pagination">
        {{ page_html|safe }}
     </ul>
</nav>    

4、頁面展示