javascript - Add legend to d3 scatterplot matrix -

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i'm trying add legend d3 scatterplot matrix (using example template: http://bl.ocks.org/mbostock/4063663), , while scatterplot displaying expected, have been unable add legend. code plot , 1 of attempts @ adding legend below:

var width = 960, size = 150, padding = 19.5;  var x = d3.scale.linear()     .range([padding / 2, size - padding / 2]);  var y = d3.scale.linear()     .range([size - padding / 2, padding / 2]);  var xaxis = d3.svg.axis()     .scale(x)     .orient("bottom")     .ticks(5);  var yaxis = d3.svg.axis()     .scale(y)     .orient("left")     .ticks(5);  var color = d3.scale.category10();      d3.csv(datafilename, function(error, dataset) {   var domainbytrait = {},       traits = d3.keys(dataset[0]).filter(function(d) { return d !== "class"; }),       n = traits.length;    traits.foreach(function(trait) {     domainbytrait[trait] = d3.extent(dataset, function(d) { return d[trait]; });   });    xaxis.ticksize(size * n);   yaxis.ticksize(-size * n);    var brush = d3.svg.brush()       .x(x)       .y(y)       .on("brushstart", brushstart)       .on("brush", brushmove)       .on("brushend", brushend);    var svg = d3.select("#visualizationdiv").append("svg")       .attr("width", size * n + padding)       .attr("height", size * n + padding)     .append("g")       .attr("transform", "translate(" + padding + "," + padding / 2 + ")");    svg.selectall(".x.axis")       .data(traits)     .enter().append("g")       .attr("class", "x axis")       .attr("transform", function(d, i) { return "translate(" + (n - - 1) * size + ",0)"; })       .each(function(d) { x.domain(domainbytrait[d]); d3.select(this).call(xaxis); });    svg.selectall(".y.axis")       .data(traits)     .enter().append("g")       .attr("class", "y axis")       .attr("transform", function(d, i) { return "translate(0," + * size + ")"; })       .each(function(d) { y.domain(domainbytrait[d]); d3.select(this).call(yaxis); });    var cell = svg.selectall(".cell")       .data(cross(traits, traits))     .enter().append("g")       .attr("class", "cell")       .attr("transform", function(d) { return "translate(" + (n - d.i - 1) * size + "," + d.j * size + ")"; })       .each(plot);    // titles diagonal.   cell.filter(function(d) { return d.i === d.j; }).append("text")       .attr("x", padding)       .attr("y", padding)       .attr("dy", ".71em")       .text(function(d) { return d.x; });    cell.call(brush);    function plot(p) {     var cell = d3.select(this);      x.domain(domainbytrait[p.x]);     y.domain(domainbytrait[p.y]);      cell.append("rect")         .attr("class", "frame")         .attr("x", padding / 2)         .attr("y", padding / 2)         .attr("width", size - padding)         .attr("height", size - padding);      cell.selectall("circle")         .data(dataset)       .enter().append("circle")         .attr("cx", function(d) { return x(d[p.x]); })         .attr("cy", function(d) { return y(d[p.y]); })         .attr("r", 3)         .style("fill", function(d) { return color(d.class); });   }    var brushcell;    // clear previously-active brush, if any.   function brushstart(p) {     if (brushcell !== this) {       d3.select(brushcell).call(brush.clear());       x.domain(domainbytrait[p.x]);       y.domain(domainbytrait[p.y]);       brushcell = this;     }   }    // highlight selected circles.   function brushmove(p) {     var e = brush.extent();     svg.selectall("circle").classed("hidden", function(d) {       return e[0][0] > d[p.x] || d[p.x] > e[1][0]           || e[0][1] > d[p.y] || d[p.y] > e[1][1];     });   }    // if brush empty, select circles.   function brushend() {     if (brush.empty()) svg.selectall(".hidden").classed("hidden", false);   }    function cross(a, b) {     var c = [], n = a.length, m = b.length, i, j;     (i = -1; ++i < n;) (j = -1; ++j < m;) c.push({x: a[i], i: i, y: b[j], j: j});     return c;   }    d3.select(self.frameelement).style("height", size * n + padding + 20 + "px");         // add legend    var legend = svg.append("g")    .attr("class", "legend")        .attr("height", 100)        .attr("width", 100)        .attr('transform', 'translate(-20,50)');       legend.selectall('rect')   .data(dataset)   .enter()   .append("rect")   .attr("x", width - 65)   .attr("y", function(d, i){ return *  20;})   .attr("width", 10)   .attr("height", 10)   .style("fill", function(d) { return color(d.class); });  legend.selectall('text')   .data(dataset)   .enter()   .append("text")   .attr("x", width - 52)   .attr("y", function(d, i){ return *  20 + 9;})   .text(function(d) { return d.class; });  });

among other unsuccessful attempts @ adding legend are

 var legend = svg.selectall("g")       .data(dataset)       .enter().append("g")       .attr("class", "legend")       .attr("transform", function(d, i) { return "translate(0," + * 20 + ")"; });   legend.append("rect")       .attr("x", width - 28)       .attr("width", 18)       .attr("height", 18)       .style("fill", function(d) { return color(d.class); });   legend.append("text")       .attr("x", width - 34)       .attr("y", 9)       .attr("dy", ".35em")       .style("text-anchor", "end")       .text(function(d) { return d.class; });

and 

 var legend = svg.selectall('g').data(dataset)   .enter()   .append('g')   .attr("class", "legend");  legend.append("rect")   .attr("x", width - 45)   .attr("y", 25)   .attr("height", 50)   .attr("width", 50)   .each(function(d, i) {     var g = d3.select(this);     g.append("rect")       .attr("x", width - 65)       .attr("y", i*25)       .attr("width", 10)       .attr("height", 10)       .style("fill", function(d) { return color(d.class); });      g.append("text")       .attr("x", width - 50)       .attr("y", * 25 + 8)       .attr("height",30)       .attr("width",100)       .style("fill", function(d) { return color(d.class); })       .text(function(d) { return d.class; });

all based on examples i've found on web. none of these approaches seem working - must missing here. insights or suggestions appreciated.

the problem right @ beginning:

var legend = svg.selectall('g').data(dataset)   .enter()   .append('g')   .attr("class", "legend");

the selectall('g') going select 1 of groups in diagram, , nothing happen because enter() indicates there on (including value gets saved legend variable) applies groups don't exist yet.

i'm pretty sure legend code supposed run within own <g> element. way, won't interfere rest of graph.

var legendgroup = svg.append('g')                      .attr('class', 'legend')                      .attr('transform', /* translate appropriate */);  var legendentry = legendgroup.selectall('g')                      .data(dataset);             //create 1 legend entry each series in dataset array           //if that's not want, create array has 1            //value every entry want in legend  legendentry.enter().append("g")       .attr("class", "legend-entry")       .attr("transform", function(d, i) { return "translate(0," + * 20 + ")"; });             //shift each entry down approx 1 line (20px)  legendentry.append("rect") //add square each entry       /* , on */

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