D3 Examples - Axis transition

xxxxxxxxxx
 
<!DOCTYPE html>
<html>
​
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
    <title>Examples</title>
    <meta name="description" content="">
    <meta name="keywords" content="">
    <link href="" rel="stylesheet">
    <style type="text/css">
    path.line {
        fill: none;
        stroke-width: 2px;
    }
    path.domain {
        fill: none;
        stroke: black;
        stroke-width: 1px;
        shape-rendering: crispEdges;
    }
    .choosen {
        fill: none;
        stroke: green;
        stroke-width: 2px;
        shape-rendering: crispEdges;
    }
    text {
        font-family: arial;
    }
    </style>
​
    <script src="https://d3js.org/d3.v3.min.js" charset="utf-8"></script>
​
</head>
​
<body>
    <div id="dropDown"></div>
    <div id="chart"></div>
​
</body>
<script type="text/javascript">
var margin = {
    top: 20,
    right: 30,
    bottom: 30,
    left: 60
},
    width = 960 - margin.left - margin.right,
    height = 350 - margin.top - margin.bottom;
​
var stateData;
​
var x = d3.scale.linear()
    .range([0, width]);
​
var y = d3.scale.linear()
    .range([height, 0]);
​
var xAxis = d3.svg.axis()
    .scale(x)
    .tickFormat(d3.format(".0f"))
    .orient("bottom");
​
var yAxis = d3.svg.axis()
    .scale(y)
    .tickFormat(d3.format(",.0f"))
    .orient("left");
​
var svg = d3.select("#chart").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 + ")");
​
var line = d3.svg.line()
    .interpolate("linear")
    .x(function(d) {
        return x(+d.date);
    })
    .y(function(d) {
        return y(+d.thing);
    });
​
​
d3.tsv('data.tsv', function(error, dataset) {
​
    var names = d3.keys(dataset[0]).filter(function(key) {
        return key !== "Date";
    });
​
    var states = names.map(function(name) {
        return {
            name: name,
            values: dataset.map(function(d) {
                return {
                    date: d.Date,
                    thing: +d[name]
                };
            })
        };
    });
​
    stateData = states;
​
    d3.select("#dropDown")
        .append("select")
        .on("change", function() {
            change(this.options[this.selectedIndex].__data__);
        })
        .selectAll("option")
        .data(names.filter(function(d) {
            return d !== "United States";
        })).enter()
        .append("option")
        .text(function(d) {
            return d;
        });
​
    x.domain(d3.extent(dataset, function(d, i) {
        return +d.Date;
    }));
​
    svg.append("g")
        .attr("class", "x axis")
        .attr("transform", "translate(0," + height + ")")
        .call(xAxis);
​
    svg.append("g")
        .attr("class", "y axis")
        .call(yAxis);
​
    var stateLines = svg.selectAll(".states")
        .data(states).enter()
        .append("path")
        .attr("class", "line")
        .attr("d", function(d) {
            return line(d.values);
        })
        .attr("stroke", function(d, i) {
            return (d.name === "United States") ? "orange" : "grey";
        });
​
    var usFilter = stateFilter("United States");
​
    var maxUS = dataMax(usFilter);
​
    change("Alabama");
​
    function change(x) {
​
        var data = stateFilter(x);
​
        var maxNew = Math.max(dataMax(data), maxUS);
​
        var greenLine = svg.selectAll(".choosen")
            .data(data);
​
        y.domain([0, maxNew]);
​
        greenLine.transition()
            .duration(2000)
            .attr("d", function(d) {
                return line(d.values);
            });
​
        greenLine.enter().append("path")
            .attr("class", "choosen")
            .attr("d", function(d) {
                return line(d.values);
            });
​
        stateLines.transition().duration(2000)
            .attr("d", function(d) {
                return line(d.values);
            });
​
        greenLine.exit()
            .transition()
            .duration(2000)
            .remove();
​
        svg.selectAll(".y")
            .transition().duration(2000)
            .call(yAxis.scale(y));
    }
​
    function dataMax(x) {
        var maxer;
        d3.max(x, function(d) {
            var temp = [];
            d.values.forEach(function(e, j) {
                temp[j] = e.thing;
            })
            maxer = Math.max.apply(null, temp);
        });
        return maxer;
    }
​
    function stateFilter(x) {
        var ans = states.filter(function(d) {
            return d.name === x;
        });
        return ans
    }
})
</script>
​
</html>
​
    