How can I filter posts by tag on the fly

Question

I need to create a catalog of posts that use lots of categories and sub categories but that can be filtered by tags. I have created a custom post type and assigned custom categories and tags to it. All working. So now I create the posts: Item 1 in SPORT > GOLF >> CLUBS with a tag USA and Item 2 in SPORT > GOLF >> CLUBS with a tag GERMANY.

If I go to mydomain/my-category/clubs Both Item 1 and Item 2 are there. Great.

If I go to mydomain/my-category/clubs?my-tags=usa only Item 1 shows. Great.

If I go to mydomain/my-category/clubs?my-tags=germany only Item 2 shows. Great.

Now, I have created a custom page template that displays a list of categories from my-category taxonomy.

So it shows

• SPORT
  • GOLF
    • CLUBS

What I want to do is add a dynamic drop down menu of my-tags (Countries) so that when a user selects one of them say USA and CLUBS, it filters only the posts with those tags. ie adds ?my-tags=usa to the end of the category's URL.

Can somebody please help me out here before my boss chews my face off.

Answer 1

Are you not looking for a simple widget like Cat + Tag Filter?

This plugin gives your visitors an ability to filter all your posts by a category or/and tag.