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javascript href=”#”页面滚动到顶端的问题
作者：半瓶墨水 链接：http://www.2maomao.com/blog/javascript-href-back-to-top-issue/
写网页免不了要写javascript，比如这样：点我啊，上顶端，可以试试向下滚屏（用滚轮或者方向键）以后再点击这个链接看看效果）
<a href="#" onclick="alert('点我干啥子？')">点我啊，上顶端</a>
这样的方式有个问题是：如果真的点了，整个浏览页面会滚动到顶端。有时候需要（比如Ajax）点击以后页面不滚动
解决方式很简单，return false就行了：点我啊，我不跑
<a href="#" onclick="alert('点我干啥子？');return false">点我啊，我不跑</a>
my paginate function for DJango
作者：半瓶墨水 链接：http://www.2maomao.com/blog/my-paginate-for-django/
感觉DJango的分页浏览不是很好用，需要先查出来再搞分页。
由于很常用，所以我自己写了个函数mypaginate（注意我的分页格式很固定，用”&page=2″这种方式）
在view中这样调用：
PAGE_SIZE = 10 #每页十个
params = "&keywords=%s&code_lang=%s" % (keywords, lang) #页面链接时候的额外参数
offset, page_navi, page_ex = mypaginate(request, total, PAGE_SIZE, params)
params = "&keywords=%s&code_lang=%s" % (keywords, lang) #页面链接时候的额外参数
offset, page_navi, page_ex = mypaginate(request, total, PAGE_SIZE, params)
然后由render传给模板，模板中这么写：
{% if page_ex.prev %}
<a href="{{page_ex.first}}">第一页</a>
<a href="{{page_ex.prev}}">上一页</a>
{% else %}
第一页 上一页
{% endif %}
{% for p, l in page_navi %}
<a id="p_{{p}}" href="/code/all/{{l}}">{{p}}</a>
{% endfor %}
{% if page_ex.max_page %}
... <a href="{{page_ex.last}}">{{page_ex.max_page}}</a>
{% endif %}
{% if page_ex.next %}
<a href="{{page_ex.next}}">下一页</a>
<a href="{{page_ex.last}}">最后页</a>
{% else %}
下一页 最后页
{% endif %}
<a href="{{page_ex.first}}">第一页</a>
<a href="{{page_ex.prev}}">上一页</a>
{% else %}
第一页 上一页
{% endif %}
{% for p, l in page_navi %}
<a id="p_{{p}}" href="/code/all/{{l}}">{{p}}</a>
{% endfor %}
{% if page_ex.max_page %}
... <a href="{{page_ex.last}}">{{page_ex.max_page}}</a>
{% endif %}
{% if page_ex.next %}
<a href="{{page_ex.next}}">下一页</a>
<a href="{{page_ex.last}}">最后页</a>
{% else %}
下一页 最后页
{% endif %}
mypaginate函数源码：
def mypaginate(request, total, pagesize, params=""):
#get page info
curr = int(request.GET.get('page', 1))
#calculate the offset
offset = (curr - 1) * pagesize
if offset >= total:
offset = total - 1
if offset < 0:
offset = 0
#paginatize
page_navi = []
page_ex = {}
max_page = (total - 1) / pagesize + 1
start = curr - curr % 10 + 1
end = start + 10
if end > max_page + 1:
end = max_page + 1 #remember it's [start, end)
else:
page_ex['max_page'] = max_page
for i in range(start, end):
link = ("?page=%d&" % i) + params
page_navi.append((i, link))
if curr > 1:
page_ex['first'] = ("?page=%d" % 1) + params
page_ex['prev'] = ("?page=%d" % (curr - 1)) + params
if curr < max_page:
page_ex['next'] = ("?page=%d" % (curr + 1)) + params
page_ex['last'] = ("?page=%d" % max_page) + params
return (offset, page_navi, page_ex)
#get page info
curr = int(request.GET.get('page', 1))
#calculate the offset
offset = (curr - 1) * pagesize
if offset >= total:
offset = total - 1
if offset < 0:
offset = 0
#paginatize
page_navi = []
page_ex = {}
max_page = (total - 1) / pagesize + 1
start = curr - curr % 10 + 1
end = start + 10
if end > max_page + 1:
end = max_page + 1 #remember it's [start, end)
else:
page_ex['max_page'] = max_page
for i in range(start, end):
link = ("?page=%d&" % i) + params
page_navi.append((i, link))
if curr > 1:
page_ex['first'] = ("?page=%d" % 1) + params
page_ex['prev'] = ("?page=%d" % (curr - 1)) + params
if curr < max_page:
page_ex['next'] = ("?page=%d" % (curr + 1)) + params
page_ex['last'] = ("?page=%d" % max_page) + params
return (offset, page_navi, page_ex)
