Need: HTML 5 / Javascript UI Component to do "Matching"/"Data Mapping" UI

I'm looking for a Javascript UI component which will let me drag a line between items in a hierarchical tree on one side of the screen to items in a hierarchical tree on the other side of the screen (similar to BizTalk's "Map" UI).

I've searched for "Javascript Tree Map", etc. and have only found "Treemap"s... which are not at all what I'm looking for.

I'm perfectly fine with requiring HTML5 and using canvas.

I just don't want to write this myself if there is already something out there.

Thanks!

I'm not sure if I can articulate what I'm looking for well, so l开发者_开发百科et me provide an illustration:

BizTalk Map UI http://geekswithblogs.net/images/geekswithblogs_net/Chilberto/WindowsLiveWriter/BizTalkMapComparisonbetweenTableLoopinga_B5B9/image_6.png

The WireIt library will enable you to drag lines that connect components. You may still need to pull in something else to get the hierarchical view on either side though.