在GAE中使用Django的时候，自定义标签是不可避免的。
今天遇到这个问题的时候，按照Django的官方做法来做：
http://docs.djangoproject.com/en/dev/howto/custom-template-tags/
发现总是报错，告诉我<%load mytemplate%>找不到：
mytemplate is not a valid tag library: Could not load template library from django.templatetags.mytemplate, No module named mytemplate
所以就网上查询。最终找到了一下两篇文章：
http://daily.profeth.de/2008/04/using-custom-django-template-helpers.html
http://justinworrall.com/blog/?p=389
才解决了问题。
下面大致说一下大体的做法
首先建立好你需要的模板文件，放在那里无所谓，不一定要放在templatetags目录下，随便放。
比如说例子中放在了common/templatefilters下面
内容如下：
|
# import the webapp module from google.appengine.ext import webapp # get registry, we need it to register our filter later. register = webapp.template.create_template_register()
def truncate(value,maxsize,stopper = '...'): """ truncates a string to a given maximum size and appends the stopper if needed """ stoplen = len(stopper) if len(value) > maxsize and maxsize > stoplen: return value[:(maxsize-stoplen)] + stopper else: return value[:maxsize] register.filter(truncate) |
里面的truncate就是我们自定义的filter，里面可以写入想要的东西。
然后在bootstrap文件里面，写入下面两行
|
from google.appengine.ext import webapp webapp.template.register_template_library( 'common.templatefilters') |
注意，不要在模板中加入load标签，上面那一行已经将你需要的代码载入了。否则会遇到刚刚我遇到的报错。
然后就可以使用了。哈哈
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