def remove_from_query(context, *args, **kwargs):
""" Renders a link with modified current query parameters """
query_params = []
# go through current query params..
for key, value_list in context['request'].GET._iterlists():
# skip keys mentioned in the args
if not key in args:
for value in value_list:
# skip key-value pairs mentioned in kwargs
if not (key in kwargs and value == unicode(kwargs[key])):
query_params.append((key, value))
# empty values will be removed
query_string = u""
if len(query_params):
query_string += u"?%s" % urllib.urlencode([
(key, force_str(value)) for (key, value) in query_params if value
]).replace("&", "&")
return query_string
def add_to_query(context, *params_to_remove, **params_to_add):
""" Renders a link with modified current query parameters """
query_params = []
# go through current query params..
for key, value_list in context['request'].GET._iterlists():
if not key in params_to_remove:
# don't add key-value pairs which already exist in the query
if key in params_to_add and unicode(params_to_add[key]) in value_list:
params_to_add.pop(key)
for value in value_list:
query_params.append((key, value))
# add the rest key-value pairs
for key, value in params_to_add.items():
query_params.append((key, value))
# empty values will be removed
query_string = u""
if len(query_params):
query_string += u"?%s" % urllib.urlencode([
(key, force_str(value)) for (key, value) in query_params if value
]).replace("&", "&")
return query_string
def modify_query(context, *params_to_remove, **params_to_change):
""" Renders a link with modified current query parameters """
query_params = []
for key, value_list in context['request'].GET._iterlists():
if not key in params_to_remove:
# don't add key-value pairs for params to change
if key in params_to_change:
query_params.append((key, params_to_change[key]))
params_to_change.pop(key)
else:
# leave existing parameters as they were if not mentioned in the params_to_change
for value in value_list:
query_params.append((key, value))
# attach new params
for key, value in params_to_change.items():
query_params.append((key, value))
query_string = u""
if len(query_params):
query_string += u"?%s" % urllib.urlencode([
(key, force_str(value)) for (key, value) in query_params if value
]).replace("&", "&")
return query_string