javascript-d3How do I create a horizontal bar chart using d3.js?

To create a horizontal bar chart using d3.js, you will need to use the d3.scaleLinear() and d3.axisBottom() functions.

You will also need to create an SVG element and append a group element to it.

Below is an example of a horizontal bar chart created with d3.js:

// 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.scale.linear().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);

// 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
d3.csv("data.csv", function(error, data) {
    data.forEach(function(d) {
        d.date = parseDate(d.date);
        d.close = +d.close;
    });

    // 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 d.close; })]);

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

    // Add the X Axis
    svg.append("g")
        .attr("class", "x axis")
        .attr("transform", "translate(0," + height + ")")
        .call(xAxis);

    // Add the Y Axis
    svg.append("g")
        .attr("class", "y axis")
        .call(yAxis);

});

The code above will produce a horizontal bar chart with the following parts:

• margin: sets the dimensions of the canvas / graph
• parseDate: parses the date / time
• x and y: sets the ranges
• xAxis and yAxis: defines the axes
• svg: adds the SVG canvas
• d3.csv(): gets the data
• x.domain() and y.domain(): scales the range of the data
• svg.append(): adds the value line path
• svg.append(): adds the X axis
• svg.append(): adds the Y axis

Helpful links

• D3.js Documentation
• D3.js Tutorial

Edit this code on GitHub