How to map two Categories to dropdowns?

Question

I have two Categories, that I want to bind with two dropdown lists on a page. When selecting a value in the first dropdown, the second dropdown should be populated with the values from another Category. How can I map two Categories on runtime using SDL Tridion APIs?

Answer 1

Yes, you can do this using a single Category and nested keywords.

Take a look at the API documentation, the online documentation (login required), forums and some other Stack Exchange questions for TaxonomyFactory, TaxonomyFilter and ExpandKeywords.

The online documentation (login required) describes the TaxonomyFilter as:

Calls a method which defines a filter for displaying only a part of the taxonomy.

Answer 2

As per my understanding, you can do this way:

1. First map the key's in the form of below representation

   • CAT A

     • Key A
       • Add RelatedKeyword as BA
     • Key B
       • Add RelatedKeyword as BB
     • Key C
       • Add RelatedKeyword as BC

   • CAT B

     • Key BA
     • Key BB
     • Key BC
2. Now render the 'A' dropdown from CAT A and corresponding 'B' dropdown from RelatedKeywords