paging

class Page:
    def __init__(self, curPage, all, perPage, showPage):
        ''' :param curPage:  The current page  :param all: # Number of data  :param perPage: # Number of data per page  :param showPage: # Show how many page numbers  '''
        a, b = divmod(all, perPage)  #  Seeking remainder , The first is business , The second is the remainder 
        if b != 0:
            a = a + 1
        self.allPage = a
        self.showPage = showPage
        self.perPage = perPage
        try:
            self.curPage = int(curPage)
            if self.curPage > self.allPage:
                self.curPage = self.allPage
        except Exception:
            self.curPage = 1

    def start(self):
        return (self.curPage - 1) * self.perPage

    def end(self):
        return self.curPage * self.perPage

    def pager(self):
        half = int(self.showPage / 2)

        #  Less than showPage, All show 
        if self.allPage < self.showPage:
            begin = 1
            end = self.allPage + 1
        else:  #  Greater than showPage
            begin = self.curPage - half
            end = self.curPage + half + 1
            #  Consider extreme cases 
            if self.curPage - half <= 0 or self.curPage + half > self.allPage:
                if self.curPage - half <= 0:
                    begin = 1
                    end = self.showPage + 1
                if self.curPage + half > self.allPage:
                    begin = self.allPage - self.showPage
                    end = self.allPage + 1

        pagelist = []
        if self.curPage > 1:
        # Contains some bootstrap Style content 
            pagelist.append(
                '<li class="page-item"><a class="page-link" href="./?page=%s "> The previous page </a></li>' % (self.curPage - 1,))
        else:
            pagelist.append('<li class="page-item"><a class="page-link"> There is no previous page </a></li>')
        for i in range(begin, end):
            temp = '<li class="page-item"><a class="page-link" href="./?page=%s">%s</a></li>' % (i, i)
            if i == self.curPage:
                temp = '<li class="page-item active"><a class="page-link">%s</a></li>' % (i,)
            pagelist.append(temp)
        if self.curPage < self.allPage:
            pagelist.append(
                '<li class="page-item"><a class="page-link" href="./?page=%s"> The next page </a></li>' % (self.curPage + 1))
        else:
            pagelist.append('<li class="page-item"><a class="page-link"> There is no next page </a></li>')
        return ''.join(pagelist)

def custom(req):
    curPage = req.GET.get('page')
    perPage = 8  #  each page 8 individual 
    userlist = models.userInfo.objects.all()  # filter(id__lt=30)
    page = Page(curPage, len(userlist), perPage, 10)
    return render(req, './App2/custom.html', {
    'userlist': userlist[page.start():page.end()], 'page': page})

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