How to display data as KB, MB, GB, TB on the y axis

Question

I am drawing a diagram showing the amount of traffic on the server. I want to display units like KB, MB, etc. On the y axis. Any opinion on how I can do this using the d3 axes.

Answer 1

You can do this using the function d3.tickFormat: Demo .

var bytesToString = function (bytes) {
    // One way to write it, not the prettiest way to write it.

    var fmt = d3.format('.0f');
    if (bytes < 1024) {
        return fmt(bytes) + 'B';
    } else if (bytes < 1024 * 1024) {
        return fmt(bytes / 1024) + 'kB';
    } else if (bytes < 1024 * 1024 * 1024) {
        return fmt(bytes / 1024 / 1024) + 'MB';
    } else {
        return fmt(bytes / 1024 / 1024 / 1024) + 'GB';
    }
}

var xScale = d3.scale.log()
               .domain([1, Math.pow(2, 40)])
               .range([0, 480]);

var xAxis = d3.svg.axis()
                .scale(xScale)
                .orient('left')
                .tickFormat(bytesToString)
                .tickValues(d3.range(11).map(
                    function (x) { return Math.pow(2, 4 * x); }
                ));

You will also want to use your own values ​​for tickValues.