using filter and 'select all' for only filtered results

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im having trouble finding a starting point for selecting only filtered results when using the built in search / filter feature. what im doing is taking an existing process and throwing a datatable on the page. they have select boxes on each row as well as one on the header to select all. all the 'select all' check box did was loop through the elements and mark as selected. now i need to only select the ones that are visible on the page. how do i use my javascript to loop through the datatable set and only select those that are visible?

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i started a live code bin thing to illustrate my current level of thrashing...

http://live.datatables.net/hikesone/2/edit