d3.js - Change dataset on d3 Tree drag n drop -

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im trying use d3 library build tree. far ive used example (http://bl.ocks.org/robschmuecker/7880033) , works fine. once node dragged , assigned 1 id liek new dataset/ change , wondering advise how ?any help, leads appreciated. ive located ondragend event dont know how refer 'changed dataset'. ideally id love call webapi method , record changes in database..

thank you, neil


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