This code will throw deprecation warnings in newer Django checkouts - see the http://www.djangosnippets.org/snippets/773/ for an improved version that should work with the recent trunk.
objects = MyModel.objects.all()
paginator = DiggPaginator(objects, 10, body=6, padding=2, page=7)
return render_to_response('template.html', {'paginator': paginator}
{% if paginator.has_next %}{# pagelink paginator.next #}{% endif %} {% for page in paginator.page_range %} {% if not page %} ... {% else %}{# pagelink page #} {% endif %} {% endfor %}
http://blog.elsdoerfer.name/2008/03/06/yet-another-paginator-digg-style/
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 | import math
from django.core.paginator import \
ObjectPaginator as DjangoPaginator,\
InvalidPage
from django.http import Http404
class Paginator(object):
"""
Much like Django's ``ObjectPaginator`` (which it uses), but always
represents a specific current page instead of just providing an interface
to the data. Based on the active page it makes a number of properties
available which mostly work exactly like the context that the
``object_list`` generic view provides.
``__init__`` takes the same arguments as ``ObjectPaginator``, plus an
additional parameter ``page`` to initialize the active page number. It does
not need to be an int, i.e. it can come directly from ``request.GET``; if
conversion to an integer fails, a ``Http404`` exception is raised.
You can also later assign to to ``page`` attribute.
>>> items = range(1,6789)
>>> paginator = Paginator(items, num_per_page=10, page=3)
>>> paginator.items
[21, 22, 23, 24, 25, 26, 27, 28, 29, 30]
>>> paginator.is_paginated
True
>>> paginator.results_per_page
10
>>> paginator.has_next
True
>>> paginator.has_previous
True
>>> paginator.page
3
>>> paginator.page0
2
>>> paginator.next
4
>>> paginator.previous
2
>>> paginator.last_on_page
30
>>> paginator.first_on_page
21
>>> paginator.pages
679
>>> paginator.hits
6788
"""
def __init__(self, *args, **kwargs):
page = kwargs.pop('page', 1)
self._paginator = DjangoPaginator(*args, **kwargs)
# Resolve the page number; this is similar to what the Django
# ``object_list`` generic view is doing.
try:
self.page = int(page)
except ValueError:
if page == 'last': self.page = self._paginator.pages
else: raise Http404
def _set_page(self, new_page):
self.__page = new_page
try:
self.object_list = self._paginator.get_page(new_page-1)
except InvalidPage:
if new_page != -1: raise Http404
else: self.object_list = [] # allow empty
self.items = self.object_list # alias
# update all exposed info for the new page number
self.update_attrs()
def _get_page(self): return self.__page
page = property(_get_page, _set_page)
def update_attrs(self):
"""Override in descendants to set custom fields."""
self.page0 = self.page-1
self.is_paginated = self._paginator.pages > 1
self.results_per_page = self._paginator.num_per_page
self.has_next = self._paginator.has_next_page(self.page-1)
self.has_previous = self._paginator.has_previous_page(self.page-1)
self.next = self.page+1
self.previous = self.page-1
self.last_on_page = self._paginator.last_on_page(self.page-1)
self.first_on_page = self._paginator.first_on_page(self.page-1)
self.pages = self._paginator.pages
self.hits = self._paginator.hits
self.page_range = self._paginator.page_range
class DiggPaginator(Paginator):
"""
Adds attributes to enable Digg-style formatting, with a leading block of
pages, an optional middle block, and another block at the end of the page
range. They are available as attributes, to be used in the same manner
as the default:
{% for page in paginator.leading_range %} ...
{% for page in paginator.main_range %} ...
{% for page in paginator.trailing_range %} ...
Additionally, ``page_range`` contains a nun-numeric ``False`` element
for every transition between two ranges.
{% for page in paginator.page_range %}
{% if not page %} ...
{% else %}{{ page }}
{% endif %}
{% endfor %}
Additional arguments passed to the constructor allow customization of
how those bocks are constructed:
body=5, tail=2
[1] 2 3 4 5 ... 91 92
|_________| |___|
body tail
|_____|
margin
body=5, tail=2, padding=2
1 2 ... 6 7 [8] 9 10 ... 91 92
|_| |__|
^padding^
|_| |__________| |___|
tail body tail
``margin`` is the minimum number of pages required between two ranges; if
there are less, they are combined into one.
# odd body length
>>> print DiggPaginator(range(1,1000), 10, body=5, page=1)
1 2 3 4 5 ... 99 100
>>> print DiggPaginator(range(1,1000), 10, body=5, page=100)
1 2 ... 96 97 98 99 100
# even body length
>>> print DiggPaginator(range(1,1000), 10, body=6, page=1)
1 2 3 4 5 6 ... 99 100
>>> print DiggPaginator(range(1,1000), 10, body=6, page=100)
1 2 ... 95 96 97 98 99 100
# leading range and main range are combined when close; note how
# we have varying body and padding values, and their effect.
>>> print DiggPaginator(range(1,1000), 10, body=5, padding=2, margin=2, page=3)
1 2 3 4 5 ... 99 100
>>> print DiggPaginator(range(1,1000), 10, body=6, padding=2, margin=2, page=4)
1 2 3 4 5 6 ... 99 100
>>> print DiggPaginator(range(1,1000), 10, body=5, padding=1, margin=2, page=6)
1 2 3 4 5 6 7 ... 99 100
>>> print DiggPaginator(range(1,1000), 10, body=5, padding=2, margin=2, page=7)
1 2 ... 5 6 7 8 9 ... 99 100
>>> print DiggPaginator(range(1,1000), 10, body=5, padding=1, margin=2, page=7)
1 2 ... 5 6 7 8 9 ... 99 100
# the trailing range works the same
>>> print DiggPaginator(range(1,1000), 10, body=5, padding=2, margin=2, page=98)
1 2 ... 96 97 98 99 100
>>> print DiggPaginator(range(1,1000), 10, body=6, padding=2, margin=2, page=97)
1 2 ... 95 96 97 98 99 100
>>> print DiggPaginator(range(1,1000), 10, body=5, padding=1, margin=2, page=95)
1 2 ... 94 95 96 97 98 99 100
>>> print DiggPaginator(range(1,1000), 10, body=5, padding=2, margin=2, page=94)
1 2 ... 92 93 94 95 96 ... 99 100
>>> print DiggPaginator(range(1,1000), 10, body=5, padding=1, margin=2, page=94)
1 2 ... 92 93 94 95 96 ... 99 100
# all three ranges may be combined as well
>>> print DiggPaginator(range(1,151), 10, body=6, padding=2, page=7)
1 2 3 4 5 6 7 8 9 ... 14 15
>>> print DiggPaginator(range(1,151), 10, body=6, padding=2, page=8)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
>>> print DiggPaginator(range(1,151), 10, body=6, padding=1, page=8)
1 2 3 4 5 6 7 8 9 ... 14 15
# no leading or trailing ranges might be required if there are only
# a very small number of pages
>>> print DiggPaginator(range(1,80), 10, body=10, page=1)
1 2 3 4 5 6 7 8
>>> print DiggPaginator(range(1,80), 10, body=10, page=8)
1 2 3 4 5 6 7 8
>>> print DiggPaginator(range(1,12), 10, body=5, page=1)
1 2
# padding: default value
>>> DiggPaginator(range(1,1000), 10, body=10).padding
4
# padding: automatic reduction
>>> DiggPaginator(range(1,1000), 10, body=5).padding
2
>>> DiggPaginator(range(1,1000), 10, body=6).padding
2
# padding: sanity check
>>> DiggPaginator(range(1,1000), 10, body=5, padding=3)
Traceback (most recent call last):
ValueError: padding too large for body (max 2)
"""
def __init__(self, *args, **kwargs):
self.body = kwargs.pop('body', 10)
self.tail = kwargs.pop('tail', 2)
self.margin = kwargs.pop('margin', 4) # todo: make default relative to body?
# validate padding value
max_padding = int(math.ceil(self.body/2.0)-1)
self.padding = kwargs.pop('padding', min(4, max_padding))
if self.padding > max_padding:
raise ValueError('padding too large for body (max %d)'%max_padding)
super(DiggPaginator, self).__init__(*args, **kwargs)
def update_attrs(self):
super(DiggPaginator, self).update_attrs()
# easier access
page, pages, body, tail, padding, margin = \
self.page, self.pages, self.body, self.tail, self.padding,\
self.margin
# put active page in middle of main range
main_range = map(int, [
math.floor(page-body/2.0)+1, # +1 = shift odd body to right
math.floor(page+body/2.0)])
# adjust bounds
if main_range[0] < 1:
main_range = map(abs(main_range[0]-1).__add__, main_range)
if main_range[1] > pages:
main_range = map((pages-main_range[1]).__add__, main_range)
# Determine leading and trailing ranges; if possible and appropriate,
# combine them with the main range, in which case the resulting main
# block might end up considerable larger than requested. While we
# can't guarantee the exact size in those cases, we can at least try
# to come as close as possible: we can reduce the other boundary to
# max padding, instead of using half the body size, which would
# otherwise be the case. If the padding is large enough, this will
# of course have no effect.
# Example:
# total pages=100, page=4, body=5, (default padding=2)
# 1 2 3 [4] 5 6 ... 99 100
# total pages=100, page=4, body=5, padding=1
# 1 2 3 [4] 5 ... 99 100
# If it were not for this adjustment, both cases would result in the
# first output, regardless of the padding value.
if main_range[0] <= tail+margin:
leading = []
main_range = [1, max(body, min(page+padding, main_range[1]))]
main_range[0] = 1
else:
leading = range(1, tail+1)
# basically same for trailing range...
if main_range[1] >= pages-(tail+margin)+1:
trailing = []
if not leading:
# ... but handle the special case of neither leading nor
# trailing ranges; otherwise, we would now modify the main
# range low bound, which we just set in the previous section,
# again.
main_range = [1, pages]
else:
main_range = [min(pages-body+1, max(page-padding, main_range[0])), pages]
else:
trailing = range(pages-tail+1, pages+1)
# finally, normalize values that are out of bound; this basically fixes
# all the things the above code screwed up in the simple case of few
# enough pages where one range would suffice.
main_range = [max(main_range[0], 1), min(main_range[1], pages)]
# set attributes
self.main_range = range(main_range[0], main_range[1]+1)
self.leading_range = leading
self.trailing_range = trailing
self.page_range = reduce(lambda x, y: x+((x and y) and [False])+y,
[self.leading_range, self.main_range, self.trailing_range])
def __str__(self):
return " ... ".join(filter(None, [
" ".join(map(str, self.leading_range)),
" ".join(map(str, self.main_range)),
" ".join(map(str, self.trailing_range))]))
if __name__ == "__main__":
import doctest
doctest.testmod()
|
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Comments
quite nice!
i got used to using generic views so it'd be quite nice to add a 'list_detail' function... this way all that would be needed to switch over would be to change the import statement.
#
I get the error: SyntaxError at /menu/ invalid syntax (views.py, line 18)
Line 18 is: class Paginator(object):
How do I fix this please?
Thanks Duncan
#
Sorry scratch the above it was a missing )
I have correctly implemented this but I now get Page no found at /menu/? when it was working correctly before?
#
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