Check if url matches in template

Question

Is it possible to check in template that some url match any pattern from urls?

Answer 1

This is something you'd normally want to do in a views.py file with the reverse() helper for named URLs with known args or resolve() for paths.

If you do need this functionality in a template specifically, here is a hacky solution:

@register.simple_tag
def urlpath_exists(path):
    """Returns True for successful resolves()'s."""
    try:
        return bool(resolve(path))
    except Resolver404:
        return False

Note: this doesn't guarantee that the URL is valid, just that there was a pattern match.

Answer 2

You can use the "as" form of the url tag to check if a named URL exists.

{% url path.to.view as the_url %}
{% if the_url %}
  <a href="{{ the_url }}">Link to optional stuff</a>
{% endif %}

When "as" is used it does not raise an exception.