rCharts addFilter with multiselect

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#require(devtools)
#install(&quot;rCharts&quot;,&quot;ramnathv&quot;,ref=&quot;dev&quot;)
require(rCharts)

n1 &lt;- nPlot(
  Freq ~ Sex,
  group = &quot;Eye&quot;,
  data = as.data.frame(HairEyeColor),
  type = &quot;multiBarChart&quot;  
)
n1$addFilters(&quot;Hair&quot;,&quot;Eye&quot;)
n1$templates$script = &quot;https://timelyportfolio.github.io/rCharts_nvd3_templates/script_multiselect.html&quot;
n1</code></pre>
  </div>
</div>
<script type="text/javascript">
function DemoCtrl($scope){
  $scope.opts = {
 "dom": "chart26a8482f1ed8",
"width":    700,
"height":    400,
"x": "Sex",
"y": "Freq",
"group": "Eye",
"type": "multiBarChart",
"id": "chart26a8482f1ed8" 
}
  $scope.data = [
 {
 "Hair": "Black",
"Eye": "Brown",
"Sex": "Male",
"Freq":             32 
},
{
 "Hair": "Brown",
"Eye": "Brown",
"Sex": "Male",
"Freq":             53 
},
{
 "Hair": "Red",
"Eye": "Brown",
"Sex": "Male",
"Freq":             10 
},
{
 "Hair": "Blond",
"Eye": "Brown",
"Sex": "Male",
"Freq":              3 
},
{
 "Hair": "Black",
"Eye": "Blue",
"Sex": "Male",
"Freq":             11 
},
{
 "Hair": "Brown",
"Eye": "Blue",
"Sex": "Male",
"Freq":             50 
},
{
 "Hair": "Red",
"Eye": "Blue",
"Sex": "Male",
"Freq":             10 
},
{
 "Hair": "Blond",
"Eye": "Blue",
"Sex": "Male",
"Freq":             30 
},
{
 "Hair": "Black",
"Eye": "Hazel",
"Sex": "Male",
"Freq":             10 
},
{
 "Hair": "Brown",
"Eye": "Hazel",
"Sex": "Male",
"Freq":             25 
},
{
 "Hair": "Red",
"Eye": "Hazel",
"Sex": "Male",
"Freq":              7 
},
{
 "Hair": "Blond",
"Eye": "Hazel",
"Sex": "Male",
"Freq":              5 
},
{
 "Hair": "Black",
"Eye": "Green",
"Sex": "Male",
"Freq":              3 
},
{
 "Hair": "Brown",
"Eye": "Green",
"Sex": "Male",
"Freq":             15 
},
{
 "Hair": "Red",
"Eye": "Green",
"Sex": "Male",
"Freq":              7 
},
{
 "Hair": "Blond",
"Eye": "Green",
"Sex": "Male",
"Freq":              8 
},
{
 "Hair": "Black",
"Eye": "Brown",
"Sex": "Female",
"Freq":             36 
},
{
 "Hair": "Brown",
"Eye": "Brown",
"Sex": "Female",
"Freq":             66 
},
{
 "Hair": "Red",
"Eye": "Brown",
"Sex": "Female",
"Freq":             16 
},
{
 "Hair": "Blond",
"Eye": "Brown",
"Sex": "Female",
"Freq":              4 
},
{
 "Hair": "Black",
"Eye": "Blue",
"Sex": "Female",
"Freq":              9 
},
{
 "Hair": "Brown",
"Eye": "Blue",
"Sex": "Female",
"Freq":             34 
},
{
 "Hair": "Red",
"Eye": "Blue",
"Sex": "Female",
"Freq":              7 
},
{
 "Hair": "Blond",
"Eye": "Blue",
"Sex": "Female",
"Freq":             64 
},
{
 "Hair": "Black",
"Eye": "Hazel",
"Sex": "Female",
"Freq":              5 
},
{
 "Hair": "Brown",
"Eye": "Hazel",
"Sex": "Female",
"Freq":             29 
},
{
 "Hair": "Red",
"Eye": "Hazel",
"Sex": "Female",
"Freq":              7 
},
{
 "Hair": "Blond",
"Eye": "Hazel",
"Sex": "Female",
"Freq":              5 
},
{
 "Hair": "Black",
"Eye": "Green",
"Sex": "Female",
"Freq":              2 
},
{
 "Hair": "Brown",
"Eye": "Green",
"Sex": "Female",
"Freq":             14 
},
{
 "Hair": "Red",
"Eye": "Green",
"Sex": "Female",
"Freq":              7 
},
{
 "Hair": "Blond",
"Eye": "Green",
"Sex": "Female",
"Freq":              8 
} 
]
  $scope.controls = [] 
  $scope.filters = [
 {
 "variable": "Hair",
"value": "Black" 
},
{
 "variable": "Hair",
"value": "Brown" 
},
{
 "variable": "Hair",
"value": "Red" 
},
{
 "variable": "Hair",
"value": "Blond" 
},
{
 "variable": "Eye",
"value": "Brown" 
},
{
 "variable": "Eye",
"value": "Blue" 
},
{
 "variable": "Eye",
"value": "Hazel" 
},
{
 "variable": "Eye",
"value": "Green" 
} 
]
  
  $scope.drawChart = function(){
    drawChart($scope.opts, $scope.data)  
  }
  
  $scope.$watch('selected', function(){
    if (!(typeof($scope.selected) === "undefined")) {
      $scope.opts.selected = $scope.selected.map(function(d){
        selectKey={};
        selectKey[d.variable]=d.value;
        return selectKey;
      })
    }
  }) 
  
  $scope.$watch('opts',function(){
    $scope.drawChart()
	}, true)
}

function drawChart(opts, data){ 
  if (_.keys(opts.selected).length > 0){
  // for multiselect union
    data = _.at(data,_.chain(opts.selected)
      .map(function(d){
        return _.compact(
          data.map(function(val,ind){
           if(val[_.keys(d)[0]]===d[_.keys(d)[0]]) {
              return ind
            } else {return false}
          })
        )
      })
      .flatten()
      .uniq()
      .value()
    )
  /* for multiselect intersection
    data = _.chain(opts.selected)
      .map(function(d){
        return _.compact(
          data.map(function(val,ind){
           if(val[_.keys(d)[0]]===d[_.keys(d)[0]]) {
              return ind
            } else {return false}
          })
        )
      })
      .flatten()
      .value();
  
     intersected = _.filter(_.countBy(testdata,function(d){return d}),opts.selected.length);
    */
  }
  
  
	var data = d3.nest()
		.key(function(d){
			return opts.group === undefined ? 'main' : d[opts.group]
		})
		.entries(data)
	
	nv.addGraph(function() {
		var chart = nv.models[opts.type]()
			.x(function(d) { return d[opts.x] })
			.y(function(d) { return d[opts.y] })
			.width(opts.width)
			.height(opts.height)

d3.select("#" + opts.id + ' svg')
  // .empty()
		.datum(data)
		.transition().duration(500)
		.call(chart);
	
	 nv.utils.windowResize(chart.update);
	 return chart;
  });
};
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