Add parameters to the current url

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Example usage in html template:
   <a href="{% addurlparameter sort 1 %}">Sort on field 1</a>
   <a href="{% addurlparameter output pdf %}">Export as pdf</a>

from django.template import Library, Node, resolve_variable, TemplateSyntaxError

register = Library()

class AddParameter(Node):
  def __init__(self, varname, value):
    self.varname = varname
    self.value = value

  def render(self, context):
    req = resolve_variable('request',context)
    params = req.GET.copy()
    params[self.varname] = self.value
    return '%s?%s' % (req.path, params.urlencode())

def addurlparameter(parser, token):
  from re import split
  bits = split(r'\s+', token.contents, 2)
  if len(bits) < 2:
    raise TemplateSyntaxError, "'%s' tag requires two arguments" % bits[0]
  return AddParameter(bits[1],bits[2])

register.tag('addurlparameter', addurlparameter)

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Comments

Nicodemus (on March 19, 2008):

This is exactly what I was looking for, but here's a tip for anyone else that wants to use it. You have to use RequestContext() instead of just Context, and you have to have django.core.context_processors.request enabled in your TEMPLATE_CONTEXT_PROCESSORS which it is not by default. It's detailed in the docs at http://www.djangoproject.com/documentation/templates_python/#subclassing-context-requestcontext.

-Nate

#

Ludwik Trammer (on February 16, 2010):

If you want to be able to pass variables from template into the template tag you may use the following version:

from django.template import Library, Node, resolve_variable, TemplateSyntaxError, Variable

register = Library()

class AddParameter(Node):
  def __init__(self, varname, value):
    self.varname = Variable(varname)
    self.value = Variable(value)

  def render(self, context):
    req = Variable('request').resolve(context)
    params = req.GET.copy()
    params[self.varname.resolve(context)] = self.value.resolve(context)
    return '%s?%s' % (req.path, params.urlencode())

def addurlparameter(parser, token):
  from re import split
  bits = split(r'\s+', token.contents, 2)
  if len(bits) < 2:
    raise TemplateSyntaxError, "'%s' tag requires two arguments" % bits[0]
  return AddParameter(bits[1],bits[2])

register.tag('addurlparameter', addurlparameter)

Sample usage:

{% addurlparameter 'sort' variable %}

#

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