D3.js Line Chart

Example with two lines.

by arvillarruel

HTML

<script src="https://d3js.org/d3.v3.min.js"></script>
<body></body>

CSS

body { font: 12px Arial;}

path {
    stroke: green;
    stroke-width: 2;
    fill: none;
}

.axis path,
.axis line {
    fill: none;
    stroke: grey;
    stroke-width: 1;
    shape-rendering: crispEdges;
}

JavaScript

// Set the dimensions of the canvas / graph
var margin = {top: 30, right: 20, bottom: 30, left: 50},
    width = 600 - margin.left - margin.right,
    height = 270 - margin.top - margin.bottom;

// Parse the date / time
var parseDate = d3.time.format("%d-%b-%y").parse;

// Set the ranges
var x = d3.time.scale().range([0, width]);
var y = d3.scale.linear().range([height, 0]);

// Define the axes
var xAxis = d3.svg.axis().scale(x)
    .orient("bottom").ticks(5);

var yAxis = d3.svg.axis().scale(y)
    .orient("left").ticks(5);

// Define the line
var valueline = d3.svg.line()
   .defined(function(d) {return d.close > 0})
   .x(function(d) { return x(d.date); })
    .y(function(d) { return y(d.close); });

// Define the 2nd line
var valueline2 = d3.svg.line()
    .x(function(d) { return x(d.date); })
    .y(function(d) { return y(d.open); });

// Adds the svg canvas
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 + ")");

    // Get the data
    var data = [{
        date: "1-May-12",
        close: "20.13",
        open: "58.13"
    }, {
        date: "30-Apr-12",
        close: "58.98",
        open: "53.98"
    }, {
        date: "27-Apr-12",
        close: "68.00",
        open: "67.00"
    }, {
        date: "26-Apr-12",
        close: 0,
        open: "89.70"
    }, {
        date: "25-Apr-12",
        close: 0,
        open: "99.00"
    }];

    data.forEach(function(d) {
        d.date = parseDate(d.date);
        d.close = +d.close;
        d.open = +d.open;
    });

    // Scale the range of the data
    x.domain(d3.extent(data, function(d) { return d.date; }));
    y.domain([0, d3.max(data, function(d) { return Math.max(d.close, d.open); })]);


    // Add the valueline path.
    svg.append("path")
        .attr("class", "line")
       ...