stark - 分页

Posted 2020-11-19 alice-bj

一、分页 - 效果图

二、分页 - 知识点

知识点

1.分页
    {{ showlist.pagination.page_html|safe }}

2.page.py
    class Pagination(object):
        def __init__(self, current_page, all_count, base_url,params, per_page_num=8, pager_count=11):
            """
            封装分页相关数据
            :param current_page: 当前页
            :param all_count:    数据库中的数据总条数
            :param per_page_num: 每页显示的数据条数
            :param base_url: 分页中显示的URL前缀
            :param pager_count:  最多显示的页码个数
            :param params:  ? 后面携带得参数 request.GET
            """

        ...

    注意：翻页时，http://127.0.0.1:8090/stark/app01/publish/?page=2&name=alice&age=18
        每页需带上之前的参数。

    import copy
    params = copy.deepcopy(params)
    params._mutable = True
    self.params = params  # self.params : {"page":77,"title":"python","nid":1}

    self.params["page"] = i
    self.params.urlencode()  将{"name":"alice","age":18} 转换成 name=alice&age=18

    temp = ‘<li><a href="%s?%s">%s</a></li>‘ % (self.base_url, self.params.urlencode(), i,)

3.list_view 视图函数
    表头，表数据，分页... 内容太多，封装在一个类里面专门用来展示数据。
    # 展示数据
    showlist = ShowList(self, data_list, request)
    class ShowList(object):
        def __init__(self):
            pass

        def get_header(self):
            pass

        def get_body(self):
            pass

stark/utils/page.py

"""
自定义分页组件
"""

class Pagination(object):
    def __init__(self, current_page, all_count, base_url,params, per_page_num=8, pager_count=11, ):
        """
        封装分页相关数据
        :param current_page: 当前页
        :param all_count:    数据库中的数据总条数
        :param per_page_num: 每页显示的数据条数
        :param base_url: 分页中显示的URL前缀
        :param pager_count:  最多显示的页码个数
        :param params:  ? 后面携带得参数 request.GET
        """

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

        if current_page < 1:
            current_page = 1

        self.current_page = current_page

        self.all_count = all_count
        self.per_page_num = per_page_num

        self.base_url = base_url

        # 总页码
        all_pager, tmp = divmod(all_count, per_page_num)
        if tmp:
            all_pager += 1
        self.all_pager = all_pager

        self.pager_count = pager_count  # 最多显示页码数
        self.pager_count_half = int((pager_count - 1) / 2)

        import copy
        params = copy.deepcopy(params)
        params._mutable = True
        self.params = params  # self.params : {"page":77,"title":"python","nid":1}


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


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


    def page_html(self):
        # 如果总页码 < 11个：
        if self.all_pager <= self.pager_count:
            pager_start = 1
            pager_end = self.all_pager + 1
        # 总页码  > 11
        else:
            # 当前页如果<=页面上最多显示(11-1)/2个页码
            if self.current_page <= self.pager_count_half:
                pager_start = 1
                pager_end = self.pager_count + 1

            # 当前页大于5
            else:
                # 页码翻到最后
                if (self.current_page + self.pager_count_half) > self.all_pager:
                    pager_start = self.all_pager - self.pager_count + 1
                    pager_end = self.all_pager + 1

                else:
                    pager_start = self.current_page - self.pager_count_half
                    pager_end = self.current_page + self.pager_count_half + 1

        page_html_list = []
        self.params["page"] = 1
        first_page = ‘<li><a href="%s?%s">首页</a></li>‘ % (self.base_url, self.params.urlencode(),)
        page_html_list.append(first_page)

        if self.current_page <= 1:
            prev_page = ‘<li class="disabled"><a href="#">上一页</a></li>‘
        else:
            self.params["page"] = self.current_page - 1
            prev_page = ‘<li><a href="%s?%s">上一页</a></li>‘ % (self.base_url, self.params.urlencode(),)

        page_html_list.append(prev_page)

        for i in range(pager_start, pager_end):
            #  self.params  : {"page":77,"title":"python","nid":1}

            self.params["page"] = i  # {"page":72,"title":"python","nid":1}
            if i == self.current_page:
                temp = ‘<li class="active"><a href="%s?%s">%s</a></li>‘ % (self.base_url, self.params.urlencode(), i,)
            else:
                temp = ‘<li><a href="%s?%s">%s</a></li>‘ % (self.base_url, self.params.urlencode(), i,)
            page_html_list.append(temp)

        if self.current_page >= self.all_pager:
            next_page = ‘<li class="disabled"><a href="#">下一页</a></li>‘
        else:
            self.params["page"] = self.current_page + 1
            next_page = ‘<li><a href="%s?%s">下一页</a></li>‘ % (self.base_url, self.params.urlencode(),)
        page_html_list.append(next_page)

        self.params["page"] = self.all_pager
        last_page = ‘<li><a href="%s?%s">尾页</a></li>‘ % (self.base_url, self.params.urlencode(),)
        page_html_list.append(last_page)

        return ‘‘.join(page_html_list)

 

stark/service/stark.py

from django.conf.urls import url
from django.shortcuts import HttpResponse, reverse, redirect, render
from django.utils.safestring import mark_safe
from django.urls import reverse
from django.forms import ModelForm
from stark.utils.page import Pagination


class ShowList(object):
    def __init__(self, config, data_list, request):
        self.config = config
        self.data_list = data_list
        self.request = request

        #  def __init__(self, current_page,
        #  all_count,
        # base_url,params,
        # per_page_num=8, pager_count=11, ):

        # 分页
        data_count = self.data_list.count()
        current_page = self.request.GET.get(‘page‘,1)
        base_path = self.request.path

        self.pagination = Pagination(current_page, data_count, base_path, self.request.GET, per_page_num=3, pager_count=11)
        self.page_data = self.data_list[self.pagination.start:self.pagination.end]


    def get_header(self):
        # 构建表头
        header_list = []
        # header_list = [‘选择‘，‘pk‘,...‘操作‘,‘操作‘]
        for field in self.config .new_list_play():
            if callable(field):
                val = field(self.config, header=True)
            else:
                if field == "__str__":
                    val = self.config .model._meta.model_name.upper()
                else:  # 根据str 拿字段对象 取中文
                    val = self.config .model._meta.get_field(field).verbose_name

            header_list.append(val)

        return header_list

    def get_body(self):
        # 构建表单
        new_data_list = []
        for data in self.page_data:
            temp = []
            for field in self.config.new_list_play():  # [‘title‘,‘price‘] 字符串找对象得属性 反射
                # print(‘field:‘, field)
                if callable(field):
                    val = field(self.config, data)
                else:
                    val = getattr(data, field)

                    if field in self.config.list_display_links:
                        _url = self.config.get_change_url(data)
                        val = mark_safe("<a href=‘%s‘>%s</a>" % (_url, val))

                temp.append(val)

            new_data_list.append(temp)  # [[‘yuan‘, 12], [‘alex‘, 18], [‘egon‘, 22]]

        return new_data_list


class ModelStark(object):
    list_display = ["__str__"]
    list_display_links = []
    modelform_class = []

    def __init__(self, model, site):
        self.model = model
        self.site = site

    def edit(self, obj=None, header=False):
        if header:
            return "操作"

        _url = self.get_change_url(obj)
        return mark_safe("<a href=‘%s‘>编辑</a>" % _url)

    def deletes(self, obj=None, header=False):
        if header:
            return ‘操作‘

        _url = self.get_delete_url(obj)
        return mark_safe("<a href=‘%s‘>删除</a>" % _url)

    def checkbox(self, obj=None, header = False):
        if header:
            return mark_safe("<input id=‘choice‘ type=‘checkbox‘>")
        return mark_safe("<input class=‘choice_item‘ type=‘checkbox‘>")

    def get_modelform_class(self):
        if not self.modelform_class:
            class ModelFormDemo(ModelForm):
                class Meta:
                    model = self.model
                    fields = "__all__"
            return ModelFormDemo
        else:
            return self.modelform_class

    def add_view(self, request):
        ModelFormDemo = self.get_modelform_class()
        form = ModelFormDemo()

        if request.method == ‘POST‘:
            form = ModelFormDemo(request.POST)
            if form.is_valid():
                form.save()
                return redirect(self.get_list_url())

        return render(request, ‘add_view.html‘, locals())

    def delete_view(self, request, delete_id):
        url = self.get_list_url()

        if request.method == ‘POST‘:
            self.model.objects.filter(pk=delete_id).delete()
            return redirect(url)

        return render(request, ‘delete_view.html‘, locals())

    def change_view(self, request, change_id):
        ModelFormDemo = self.get_modelform_class()
        edit_obj = self.model.objects.filter(pk=change_id).first()
        form = ModelFormDemo(instance=edit_obj)

        if request.method == "POST":
            form = ModelFormDemo(request.POST, instance=edit_obj)
            if form.is_valid():
                form.save()
                return redirect(self.get_list_url())

        return render(request,‘change_view.html‘, locals())

    def new_list_play(self):
        temp = []
        temp.append(ModelStark.checkbox)
        temp.extend(self.list_display)
        temp.append(ModelStark.edit)
        temp.append(ModelStark.deletes)

        return temp

    def get_change_url(self, obj):
        model_name = self.model._meta.model_name
        app_lable = self.model._meta.app_label

        _url = reverse("%s_%s_change" % (app_lable, model_name), args=(obj.pk,))

        return _url

    def get_delete_url(self, obj):
        model_name = self.model._meta.model_name
        app_label = self.model._meta.app_label

        _url = reverse("%s_%s_delete" % (app_label, model_name), args=(obj.pk,))

        return _url

    def get_add_url(self):
        model_name = self.model._meta.model_name
        app_label = self.model._meta.app_label

        _url = reverse("%s_%s_add" % (app_label, model_name))

        return _url

    def get_list_url(self):
        model_name = self.model._meta.model_name
        app_label = self.model._meta.app_label

        _url = reverse("%s_%s_list" % (app_label, model_name))

        return _url

    def list_view(self, request):
        data_list = self.model.objects.all()

        # 展示数据
        showlist = ShowList(self, data_list, request)

        # 构建一个查看url
        add_url = self.get_add_url()
        return render(request, ‘list_view.html‘,locals())

    def get_urls2(self):
        temp = []

        model_name = self.model._meta.model_name
        app_label = self.model._meta.app_label

        temp.append(url(r‘add/‘, self.add_view, name="%s_%s_add" % (app_label, model_name)))
        temp.append(url(r‘(d+)/delete/‘, self.delete_view, name="%s_%s_delete" % (app_label, model_name)))
        temp.append(url(r‘(d+)/change/‘, self.change_view, name="%s_%s_change" % (app_label, model_name)))
        temp.append(url(r‘^$‘, self.list_view, name="%s_%s_list" % (app_label, model_name)))

        return temp

    @property
    def urls2(self):

        return self.get_urls2(), None, None


class StarkSite(object):
    def __init__(self):
        self._registry = {}

    def register(self, model, stark_class=None):
        if not stark_class:
            stark_class = ModelStark

        self._registry[model] = stark_class(model,self)


    def get_urls(self):
        temp = []
        
        # 模型表，配置类对象
        for model, stark_class_obj in self._registry.items():
            model_name = model._meta.model_name
            app_label = model._meta.app_label

            # 分发增删改查
            temp.append(url(r‘%s/%s/‘%(app_label,model_name), stark_class_obj.urls2))

        return temp

    @property
    def urls(self):

        return self.get_urls(), None, None


site = StarkSite()

stark.py

 

list_view.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link rel="stylesheet" href="/static/bootstrap/css/bootstrap.css">
    <script src="/static/js/jquery-1.12.4.min.js"></script>
    <style type="text/css">

    </style>
</head>
<body>

<h4>数据列表</h4>

<div class="container">
    <div class="row">
        <div class="col-md-9">
            <a href="{{ add_url }}" class="btn btn-primary">添加数据</a>
            <table class="table table-bordered table-striped">
                <thead>
                    <tr>
                        {% for item in showlist.get_header %}
                            <th>{{ item }}</th>
                        {% endfor %}

                    </tr>

                </thead>
                <tbody>
                    {% for data in showlist.get_body %}
                        <tr>
                            {% for item in data %}
                                <td>{{ item }}</td>
                            {% endfor %}

                        </tr>
                    {% endfor %}

                </tbody>
            </table>

            <nav>
                <ul class="pagination">
                    {{ showlist.pagination.page_html|safe }}
                </ul>
            </nav>

        </div>
    </div>
</div>

<script type="text/javascript">
    $(‘#choice‘).click(function () {
        if($(this).prop(‘checked‘)){
            $(‘.choice_item‘).prop(‘checked‘,true)
        }else{
            $(‘.choice_item‘).prop(‘checked‘,false)
        }
    })


</script>

</body>
</html>

list_view.html