Simple GitHub Calendar

A simple version of the GiHub commit calendar, just to try to simplify this exemple by using d3.time utilities. if you need this type of calendar, you should know about the cal-heatmap plugin.

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <script src="https://d3js.org/d3.v3.min.js"></script>
    <style>
        .cell {
            stroke: silver;
        }

.label {
            font-size: 10px;
            font-family: sans-serif;
            fill: #666;
        }

.tooltip {
            border: silver 1px solid;
            background-color: white;
            position: absolute;
            pointer-events: none;
            border-radius: 8px 8px 0px 8px;
            padding: 5px;
            opacity: 0.8;
            font-size: 10px;
            font-family: sans-serif;
        }

.hovered {
            stroke: black;
        }

.cell-hover {
            pointer-events: none;
            stroke-width: 2px;
            stroke: black;
        }

.cell.out-of-range {
            display: none;
        }
    </style>
</head>
<body>

var firstDayOfTheMonth = new Date('01/01/2015');
    var lastDayOfTheMonth = new Date('12/31/2015');

var firstDayOfWeekBeforeFirstDayOfMonth = d3.time.week.offset(firstDayOfTheMonth, -1);

// nullify days out of range
    data[0].forEach(function(d, i){
        if(i < data[0].length - firstIncompleteWeek.length){
            d.value = null;
        }
    });

data[data.length-1].forEach(function(d, i){
        if(i > data[0].length - 1 - lastIncompleteWeek.length){
            d.value = null;
        }
    });

var config = {
        width: 1000,
        height: 250,
        margin: {top: 80, right: 10, bottom: 40, left: 30},
        dateFormatX: d3.time.format('%d %b'),
        dateFormatY: d3.time.format('%a'),
        dateFormatTooltip: d3.time.format('%d %b, %Y'),
        labelAxisPadding: 5,
        colorScale: d3.scale.linear().domain(d3.extent(dataValues)).range(['white', 'skyblue'])
    };
    config.chartWidth = config.width - config.margin.left - config.margin.right;
    config.chartHeight = config.height - config.margin.top - config.margin.bottom;
    config.cellWidth = Math.floor(config.chartWidth / data.length);
    config.cellHeight = ~~(config.chartHeight / data[0].length);

var tooltip = d3.select('.tooltip').style({display: 'none'});

var chartContainer = d3.select('.container')
            .append('svg')
            .attr({
                width: config.width,
                height: config.height
            })
            .append('g')
            .attr({
                transform: 'translate(' + [config.margin.left, config.margin.top] + ')'
            });

var columns = chartContainer.selectAll('g.column')
            .data(data);

columns.enter().append('g')
            .attr({
                'class': 'column'
            });

columns.selectAll('rect.cell')
            .data(function(d){ return d; })
            .enter().append('rect')
            .classed('cell', true)
            .classed('out-of-range', function(d){ return d.value === null; })
            .attr({
                x: function(d, i, pI){ return config.cellWidth * pI; },
                y: function(d, i, pI){ return config.cellHeight * i; },
                width: config.cellWidth,
                height: config.cellHeight,
                fill: function(d){ return config.colorScale(d.value); }
            })
            .on('mousemove', function(d){
                var currentCell = d3.select(this);
                var currentCellX = currentCell.attr('x');
                var currentCellY = currentCell.attr('y');

tooltip.html(config.dateFormatTooltip(d.date) + '<br>Value: ' + d.value)
                        .style({
                            display: 'block',
                            left: function(){
                                return d3.event.clientX - this.offsetWidth + 'px';
                            },
                            top: function(){
                                return d3.event.clientY - this.offsetHeight + 'px';
                            }
                        });

cellHover.attr({
                    x: currentCellX,
                    y: currentCellY,
                    fill: config.colorScale(d.value)
                })
                        .style({display: 'block'})
            })
            .on('mouseout', function(){
                tooltip.style({ display: 'none'});
                cellHover.style({display: 'none'})
            });

columns.exit().remove();

chartContainer.selectAll('text.label.x')
            .data(d3.transpose(data)[0])
            .enter().append('text')
            .attr({
                'class': 'label x',
                x: function(d, i){ return config.cellWidth * i; },
                dy: function(d, i){ return - config.labelAxisPadding; },
                transform: function(d, i){
                    return 'rotate(-60, ' + (config.cellWidth * i + 5) + ', -10)';
                }
            })
            .text(function(d){ return config.dateFormatX(new Date(d.date)); });

chartContainer.selectAll('text.label.y')
            .data(data[0])
            .enter().append('text')
            .attr({
                'class': 'label y',
                y: function(d, i){ return config.cellHeight * i + config.cellHeight / 2; }
            })
            .text(function(d){ return config.dateFormatY(new Date(d.date)); })
            .attr({
                dx: function(d, i){ return -this.getBBox().width - config.labelAxisPadding; }
            });

var cellHover = chartContainer.append('rect')
            .style({ display: 'none'})
            .attr({
                'class': 'cell-hover',
                width: config.cellWidth,
                height: config.cellHeight
            });

</script>
</body>
</html>

Modified http://d3js.org/d3.v3.min.js to a secure url

https://d3js.org/d3.v3.min.js