index

<!DOCTYPE html>
<html>
    <head>
        <title>Simple Stack</title>
        <style>
            svg {
                border: solid 1px #ccc;
                font: 10px sans-serif;
                shape-rendering: crispEdges;
            }
        </style>             
    </head>
    <body>
        <input type='button' value='Update' id='update' />
        <div id="viz"></div>

// create canvas
            var svg = d3.select("#viz").append("svg:svg")
            .attr("class", "chart")
            .attr("width", w)
            .attr("height", h )
            .append("svg:g")
            .attr("transform", "translate(10,470)");

var generateMatrix = function(){
                var getNum = function(){ 
                    return Math.random() * 10000;
                }
                var matrix = [
                    [ 1, getNum(), getNum(), getNum()],
                    [ 2, getNum(), getNum(), getNum()],
                    [ 3, getNum(), getNum(), getNum()],
                    [ 4, getNum(), getNum(), getNum()],
                    [ 5, getNum(), getNum(), getNum()]
                ];
                return matrix;
            }

var update = function(){
                x = d3.scale.ordinal().rangeRoundBands([0, w-50])
                y = d3.scale.linear().range([0, h-50])
                z = d3.scale.ordinal().range(["darkblue", "blue", "lightblue"])

// 4 columns: ID,c1,c2,c3
                var matrix = generateMatrix();

var remapped =["c1","c2","c3"].map(function(dat,i){
                    return matrix.map(function(d,ii){
                        return {x: ii, y: d[i+1] };
                    })
                });

var stacked = d3.layout.stack()(remapped)

x.domain(stacked[0].map(function(d) { return d.x; }));
                y.domain([0, d3.max(stacked[stacked.length - 1], function(d) { return d.y0 + d.y; })]);

// Add a group for each column.
                var valgroup = svg.selectAll("g.valgroup")
                    .data(stacked)
                    .enter().append("svg:g")
                    .attr("class", "valgroup")
                    .style("fill", function(d, i) { return z(i); })
                    .style("stroke", function(d, i) { return d3.rgb(z(i)).darker(); });

// Add a rect for each date.
                var rect = valgroup.selectAll("rect")
                    .data(function(d){return d;})

rect.enter().append("svg:rect")
                    .attr("x", function(d) { return x(d.x); })
                    .attr("y", function(d) { return h; })
                    .attr("height", function(d) { return 0; })
                    .attr("width", x.rangeBand());

rect.transition()
                    .duration(250).ease("quad")
                    .attr("x", function(d) { return x(d.x); })
                    .attr("y", function(d) { return -y(d.y0) - y(d.y); })
                    .attr("height", function(d) { return y(d.y); })
                    .attr("width", x.rangeBand())
            };

//Update on click
            d3.select('#update').on('click', update);
        </script>
    </body>
</html>