CSV Input Data as variable

by Nivaldo

HTML

<h3>Note how <code style="color: gray">var bardata</code> is the CSV input.</h3>

CSS

path {
    fill: none;
    stroke: firebrick;
}

rect {
    fill: lightsteelblue;
    stroke: steelblue;
    stroke-width: 3px;
}

JavaScript

var bardata="letter,frequency\nA,0.89\nB,0.71\nC,0.45";

var margin = {top: 20, right: 30, bottom: 30, left: 40},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

var x = d3.scale.ordinal()
    .rangeRoundBands([0, width], .1, .2);

var y = d3.scale.linear()
    .range([height, 0]);

var svg = d3.select("body").append("svg")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
  .append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

letters = d3.csv.parse(bardata, function(d) { 
    return {
        letter:d.letter, 
        frequency:+d.frequency
    }; 
});

x.domain(letters.map(function(d) { return d.letter; }));
y.domain([0, d3.max(letters, function(d) { return d.frequency; })]);

svg.append("g")
    .attr("class", "x axis")
    .attr("transform", "translate(0," + height + ")")
    .call(d3.svg.axis().scale(x).orient("bottom"));

svg.append("g")
    .attr("class", "y axis")
    .call(d3.svg.axis().scale(y).orient("left"));

svg.selectAll(".bar")
    .data(letters)
  .enter().append("rect")
    .attr("class", "bar")
    .attr("x", function(d) { return x(d.letter); })
    .attr("width", x.rangeBand())
    .attr("y", function(d) { return y(d.frequency); })
    .attr("height", function(d) { return height - y(d.frequency); });