codeigniter method question

I`m writing my first codeigniter (news) website. I wonder what is the most appropriate way to do in this scenario:

Assume there is a link (method) called browse. When user clicks on that link the page shows a list of cities. When user click on some city the page shows available categories for that city. When some catego开发者_运维百科ry is clicked the page shows sub categories for selected category.

When user click on some link of sub categories the page is reloaded and show a result based on selected city, category and sub category.

For example the URI will look like foo.bar/browse/city/rubrics/subrubric/

Which is the right way to do with codeigniter ?

CI works with URI segments.

For the above to work (without routing) your method could look something like:

function browse($city=null,$category=null,$subcat=null)
{
    if($category==null && $subcat==null)
    {
        $this->load->view('show_cities'):
    }

    if($city!=null && $category!=null && $subcat==null)
    {
        $this->load->view('show_categories');
    }

    if($city!=null && $category!=null && $subcat!=null)
    {
        $this->load->view('show_subcats');
    }

}

the load->view is just an example, you'd have some interaction with the model or whatever.

Now if you browse to site.com/browse/city/foo/bar you'll see the subcats - CI passes the URI segments to the method.

There are of course other ways to do this, this is just one - and probably isn't the most efficient.