Hi Andrew, We actually do have a parameter type called drilldown. Just like standard select lists, these can can be generated statically or dynamically. They can be checkboxes or radio buttons and be hierarchical (choosing a higher option explicitly passes the lower options for e.g. command-line building) or not. One example: https://usegalaxy.org/tool_runner?tool_id=toolshed.g2.bx.psu.edu%2Frepos%2Fd... on a bed file with dbkey set to hg18, notice the "Choose Tables to use" option: Here is the Genomespace exporter tool with radio buttons, https://usegalaxy.org/tool_runner?tool_id=genomespace_exporter: Thanks for using Galaxy, Dan On Nov 12, 2014, at 1:04 PM, Andrew Warren <anwarren@vbi.vt.edu> wrote:

Hi all,

I was wondering if there were any existing implementations of, or any plans for, a drill down selection component that supports thousands of items? For example a taxonomy based drill down.

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