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test.html
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<!DOCTYPE html>
<head>
<meta charset="utf-8">
<script src="https://d3js.org/d3.v5.min.js"></script>
<style>
body {
margin:auto;
width: 885px;
font: 10px arial;
padding: 25px;
}
.y-axis line {
opacity:.2;
}
.y-axis path {
display:none;
}
.line {
fill: none;
stroke-width: 1.5px;
opacity:.75;
}
.overlay {
fill: none;
pointer-events: all;
}
.lineHoverText {
text-shadow:
-2px -2px 0 #fff,
2px -2px 0 #fff,
-2px 2px 0 #fff,
2px 2px 0 #fff;
}
.hoverCircle {
opacity: .75;
}
</style>
</head>
<body>
<font style="font-size:11px;">Change metric:</font>
<select id="selectbox">
<option value="_1">Fahrenheit</option>
<option value="_2">Celsius</option>
</select>
<svg id="chart" width="850" height="410"></svg>
<script>
d3.csv("data.csv").then(d => chart(d))
function chart(data) {
var keys = data.columns.slice(1);
var parseTime = d3.timeParse("%Y%m%d"),
formatDate = d3.timeFormat("%Y-%m-%d"),
bisectDate = d3.bisector(d => d.date).left,
formatValue = d3.format(",.0f");
data.forEach(function(d) {
d.date = parseTime(d.date);
return d;
})
var svg = d3.select("#chart"),
margin = {top: 15, right: 35, bottom: 15, left: 35},
width = +svg.attr("width") - margin.left - margin.right,
height = +svg.attr("height") - margin.top - margin.bottom;
var x = d3.scaleTime()
.rangeRound([margin.left, width - margin.right])
.domain(d3.extent(data, d => d.date))
var y = d3.scaleLinear()
.rangeRound([height - margin.bottom, margin.top]);
var z = d3.scaleOrdinal(d3.schemeCategory10);
var line = d3.line()
.curve(d3.curveCardinal)
.x(d => x(d.date))
.y(d => y(d.degrees));
svg.append("g")
.attr("class","x-axis")
.attr("transform", "translate(0," + (height - margin.bottom) + ")")
.call(d3.axisBottom(x).tickFormat(d3.timeFormat("%b")));
svg.append("g")
.attr("class", "y-axis")
.attr("transform", "translate(" + margin.left + ",0)");
var focus = svg.append("g")
.attr("class", "focus")
.style("display", "none");
focus.append("line").attr("class", "lineHover")
.style("stroke", "#999")
.attr("stroke-width", 1)
.style("shape-rendering", "crispEdges")
.style("opacity", 0.5)
.attr("y1", -height)
.attr("y2",0);
focus.append("text").attr("class", "lineHoverDate")
.attr("text-anchor", "middle")
.attr("font-size", 12);
var overlay = svg.append("rect")
.attr("class", "overlay")
.attr("x", margin.left)
.attr("width", width - margin.right - margin.left)
.attr("height", height)
update(d3.select('#selectbox').property('value'), 0);
function update(input, speed) {
var copy = keys.filter(f => f.includes(input))
var cities = copy.map(function(id) {
return {
id: id,
values: data.map(d => {return {date: d.date, degrees: +d[id]}})
};
});
y.domain([
d3.min(cities, d => d3.min(d.values, c => c.degrees)),
d3.max(cities, d => d3.max(d.values, c => c.degrees))
]).nice();
svg.selectAll(".y-axis").transition()
.duration(speed)
.call(d3.axisLeft(y).tickSize(-width + margin.right + margin.left))
var city = svg.selectAll(".cities")
.data(cities);
city.exit().remove();
city.enter().insert("g", ".focus").append("path")
.attr("class", "line cities")
.style("stroke", d => z(d.id))
.merge(city)
.transition().duration(speed)
.attr("d", d => line(d.values))
tooltip(copy);
}
function tooltip(copy) {
var labels = focus.selectAll(".lineHoverText")
.data(copy)
labels.enter().append("text")
.attr("class", "lineHoverText")
.style("fill", d => z(d))
.attr("text-anchor", "start")
.attr("font-size",12)
.attr("dy", (_, i) => 1 + i * 2 + "em")
.merge(labels);
var circles = focus.selectAll(".hoverCircle")
.data(copy)
circles.enter().append("circle")
.attr("class", "hoverCircle")
.style("fill", d => z(d))
.attr("r", 2.5)
.merge(circles);
svg.selectAll(".overlay")
.on("mouseover", function() { focus.style("display", null); })
.on("mouseout", function() { focus.style("display", "none"); })
.on("mousemove", mousemove);
function mousemove() {
var x0 = x.invert(d3.mouse(this)[0]),
i = bisectDate(data, x0, 1),
d0 = data[i - 1],
d1 = data[i],
d = x0 - d0.date > d1.date - x0 ? d1 : d0;
focus.select(".lineHover")
.attr("transform", "translate(" + x(d.date) + "," + height + ")");
focus.select(".lineHoverDate")
.attr("transform",
"translate(" + x(d.date) + "," + (height + margin.bottom) + ")")
.text(formatDate(d.date));
focus.selectAll(".hoverCircle")
.attr("cy", function(e){
console.log(d[e]);
return y(d[e])
})
.attr("cx", x(d.date));
focus.selectAll(".lineHoverText")
.attr("transform",
"translate(" + (x(d.date)) + "," + height / 2.5 + ")")
.text(e => e + " " + "º" + formatValue(d[e]));
x(d.date) > (width - width / 4)
? focus.selectAll("text.lineHoverText")
.attr("text-anchor", "end")
.attr("dx", -10)
: focus.selectAll("text.lineHoverText")
.attr("text-anchor", "start")
.attr("dx", 10)
}
}
var selectbox = d3.select("#selectbox")
.on("change", function() {
update(this.value, 750);
})
}
</script>
</body>