dropout (underscore required)

dropout.js

function dragOutElement(node,data,savename,mime){
  mime = mime === undefined ? "text/plain" : mime;
  var internals ={
    node:node,
    data:data,
    savename:savename,
    mime:mime
  };
  
  var details = mime;
  details += ":" + savename;
  details += ":data:" + mime;
  details += ";base64,";
  node.addEventListener("dragstart",function(e){
    var d = [
      _.result(internals,"mime"),
      ":",
      _.result(internals,"savename"),
      ":data:",
      _.result(internals,"mime"),
      ";base64,",
      btoa(_.result(internals,"data"))
    ];
    
    e.dataTransfer.setData("DownloadURL",d.join(""));
  });
}