CODEWITHSUNDEEP
javascriptangularjsd3.jschartsnvd3.js
user2373881
user2373881

Reputation: 119

How to use d3.time.scale to create label for each hour of day and each day of week

Ok there may be so many duplicates to this question on SO, I have checked almost all of them but I couldn't figure out an answer to my quest.

I have this service which gives a count of hits to my site every minute and I want to display it in a dashboard using a d3 nvd3 line graph.

I got it all working except one thing, I want the labels on the x axis to go from midnight to midnight, i.e (00:00 to 23:00) in intervals of 1 hour [00:00, 01:00, 02:00, 03:00, 04:00, ..., 22:00, 23:00]

But I am not able to get this right. I have tried all possible combinations using d3.time.scale but I am not getting it right. I get all random labels on x axis.

screenshot

This is the function I am currently using which gives those random values:

$scope.xAxisTickFormatFunction = function() {
    return function(d) {
        return d3.time.format("%H:%M")(new Date(d));
    };
};

After I get this timeline of a day working, I would like to do this per each day of the week too.

I really can't figure out how d3.time.scale works, I have been working on this since yesterday.

Upvotes: 0

Views: 5381

Answers (1)

mdml
mdml

Reputation: 22922

The real trick is to be able to take advantage of all the built-in time formatting/interval tools in D3. Here's a very simple example, based off this block, where you define your time scale across the entirety of one day (24 hours) using d3.time.scale().nice():

// Set up the SVG
var svg = d3.select("body").append("svg")
            .attr("width", width)
            .attr("height", height);

// Define your time scale
var x = d3.time.scale()
    .domain([new Date, new Date])
    .nice(d3.time.day)
    .range([0, width - 50]);

// Add your axis
svg.append("g")
   .attr("transform", "translate(5,0)")
   .call(d3.svg.axis().scale(x).ticks(24).tickFormat(d3.time.format("%H:%M")));

The above code produces this axis:

enter image description here

Upvotes: 3

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