我的自定义代码是
class RatingsNode(template.Node):
def __init__(self,revschedid,tempid,empid,quesid):
self.revschedid = template.Variable(revschedid)
self.tempid = template.Variable(tempid)
self.empid = template.Variable(empid)
self.quesid = template.Variable(quesid)
def render(self, context):
try:
fill_answers = tbtrnappraisalanswer.objects.get(intRevSchedID_id=self.revschedid.resolve(context),intTemplateID_id=self.tempid.resolve(context),intEmpID_id__exact=self.empid.resolve(context),intQuesID_id__exact=self.quesid.resolve(context))
return fill_answers.intEmpValue_id
except:
return ''
def get_rating(parser, token):
try:
# split_contents() knows not to split quoted strings.
tag_name,revschedid,tempid,empid,quesid = token.split_contents()
except ValueError:
raise template.TemplateSyntaxError("%r tag requires four arguments" % token.contents.split()[0])
return RatingsNode(revschedid,tempid,empid,quesid)
register.tag('get_rating_question',get_rating)
我的模板代码是
<span class="input-group-addon">
{% if get_rating_question schedid tempid user.id question.intQuesID == rating.intRatingValue %}
<input type="radio" name="fill_apraisal_rating{{ question.intQuesID }}" value="{{ rating.intRatingValue }}" checked='checked'>
{% else %}
<input type="radio" name="fill_apraisal_rating{{ question.intQuesID }}" value="{{ rating.intRatingValue }}">
{% endif %}
</span>
以上代码引发了错误 环境：
Request Method: GET
Request URL: http://127.0.0.1:8000/opas/fill_appraisal/5/2/
Django Version: 1.5.4
Python Version: 2.7.5
Installed Applications:
('django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.sites',
'django.contrib.messages',
'django.contrib.staticfiles',
'csvimport',
'django.contrib.admin',
'django.contrib.admindocs',
'employees',
'schdeules',
'crispy_forms')
Installed Middleware:
('django.middleware.common.CommonMiddleware',
'django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware')
Template error:
In template C:\pythonprgs\opas\schdeules\templates\schdeules\fill_appraisal.html, error at line 37
Unused 'schedid' at end of if expression.
27 : {% endif %}
28 :
29 : {% if question.enumRating == "1" %}
30 : <br>
31 : <div class="input-group">
32 : {% for rating in ratings %}
33 : {% ifnotequal rating.intRatingValue 0 %}
34 :
35 :
36 : <span class="input-group-addon">
37 : {% if get_rating_question schedid tempid user.id question.intQuesID == rating.intRatingValue %}
38 : <input type="radio" name="fill_apraisal_rating{{ question.intQuesID }}" value="{{ rating.intRatingValue }}" checked='checked'>
39 :
40 : {% else %}
41 : <input type="radio" name="fill_apraisal_rating{{ question.intQuesID }}" value="{{ rating.intRatingValue }}">
42 : {% endif %}
43 : </span>
44 : {{ rating.intRatingValue }}
45 :
46 : {% endifnotequal %}
47 : {% endfor %}
Traceback:
File "C:\Python27\lib\site-packages\django\core\handlers\base.py" in get_response
115. response = callback(request, *callback_args, **callback_kwargs)
File "C:\Python27\lib\site-packages\django\contrib\auth\decorators.py" in _wrapped_view
25. return view_func(request, *args, **kwargs)
File "C:\pythonprgs\opas\schdeules\views.py" in fillappraisal
39. return render(request, 'schdeules/fill_appraisal.html',context)
File "C:\Python27\lib\site-packages\django\shortcuts\__init__.py" in render
53. return HttpResponse(loader.render_to_string(*args, **kwargs),
File "C:\Python27\lib\site-packages\django\template\loader.py" in render_to_string
170. t = get_template(template_name)
File "C:\Python27\lib\site-packages\django\template\loader.py" in get_template
146. template, origin = find_template(template_name)
File "C:\Python27\lib\site-packages\django\template\loader.py" in find_template
135. source, display_name = loader(name, dirs)
File "C:\Python27\lib\site-packages\django\template\loader.py" in __call__
43. return self.load_template(template_name, template_dirs)
File "C:\Python27\lib\site-packages\django\template\loader.py" in load_template
49. template = get_template_from_string(source, origin, template_name)
File "C:\Python27\lib\site-packages\django\template\loader.py" in get_template_from_string
157. return Template(source, origin, name)
File "C:\Python27\lib\site-packages\django\template\base.py" in __init__
125. self.nodelist = compile_string(template_string, origin)
File "C:\Python27\lib\site-packages\django\template\base.py" in compile_string
153. return parser.parse()
File "C:\Python27\lib\site-packages\django\template\base.py" in parse
274. compiled_result = compile_func(self, token)
File "C:\Python27\lib\site-packages\django\template\loader_tags.py" in do_extends
215. nodelist = parser.parse()
File "C:\Python27\lib\site-packages\django\template\base.py" in parse
274. compiled_result = compile_func(self, token)
File "C:\Python27\lib\site-packages\django\template\loader_tags.py" in do_block
190. nodelist = parser.parse(('endblock',))
File "C:\Python27\lib\site-packages\django\template\base.py" in parse
274. compiled_result = compile_func(self, token)
File "C:\Python27\lib\site-packages\django\template\defaulttags.py" in do_for
769. nodelist_loop = parser.parse(('empty', 'endfor',))
File "C:\Python27\lib\site-packages\django\template\base.py" in parse
274. compiled_result = compile_func(self, token)
File "C:\Python27\lib\site-packages\django\template\defaulttags.py" in do_if
905. nodelist = parser.parse(('elif', 'else', 'endif'))
File "C:\Python27\lib\site-packages\django\template\base.py" in parse
274. compiled_result = compile_func(self, token)
File "C:\Python27\lib\site-packages\django\template\defaulttags.py" in do_for
769. nodelist_loop = parser.parse(('empty', 'endfor',))
File "C:\Python27\lib\site-packages\django\template\base.py" in parse
274. compiled_result = compile_func(self, token)
File "C:\Python27\lib\site-packages\django\template\defaulttags.py" in ifnotequal
819. return do_ifequal(parser, token, True)
File "C:\Python27\lib\site-packages\django\template\defaulttags.py" in do_ifequal
783. nodelist_true = parser.parse(('else', end_tag))
File "C:\Python27\lib\site-packages\django\template\base.py" in parse
274. compiled_result = compile_func(self, token)
File "C:\Python27\lib\site-packages\django\template\defaulttags.py" in do_if
904. condition = TemplateIfParser(parser, bits).parse()
File "C:\Python27\lib\site-packages\django\template\smartif.py" in parse
191. self.current_token.display())
Exception Type: TemplateSyntaxError at /opas/fill_appraisal/5/2/
Exception Value: Unused 'schedid' at end of if expression.
如果从自定义模板标签返回的值等于单选按钮值，我想检查单选按钮。 提前谢谢。
答案 0 :(得分：1)
Django的模板语言不是Python，而templatetags不是函数，因此{% if get_rating_question schedid tempid user.id question.intQuesID == rating.intRatingValue %} jus不起作用。这里你需要的是让你的templatetag在上下文中设置一个变量，然后测试这个变量，即：
{% get_rating_question schedid tempid user.id question.intQuesID as whatever %}
{% if rating.intRatingValue == whatever %}
# do something here
{% endif %}
您可以在此处阅读有关更新上下文的FineManual（tm）：https://docs.djangoproject.com/en/1.5/howto/custom-template-tags/#setting-a-variable-in-the-context - 以及在此处编写assignemnt标签的更简单方法：https://docs.djangoproject.com/en/1.5/howto/custom-template-tags/#assignment-tags
或者您确实可以将您的模板标签带到rating.intRatingValue，进行测试并返回相应的字符串，但它的灵活性会降低。
作为旁注：在你的templatetag代码中，你有一个简单的期望条款。帮自己一个忙，并修复它只能捕获预期的异常。
答案 1 :(得分：1)
如果要在if条件下使用某些操作，请使用django中的Filter
对于前：
{%if course|user_is_owner %}
<div class="col-md-6">
<a href="/course/action/{{course.course_uuid}}/" class="btn-danger">Delete</a>
</div>
{%endif%}
答案 2 :(得分：0)
只需将rating.intRatingValue传递给标记，如果符合条件，则使标记返回字符串checked="checked"，否则返回空字符串。然后将其放在模板中：
<input type="radio" name="fill_apraisal_rating{{ question.intQuesID }}"
value="{{ rating.intRatingValue }}"
{% get_rating_question schedid tempid user.id question.intQuesID, rating.intRatingValue %}>
P.S。 simple_tag可能是更好的选择。