This is a multiple line graph demonstrating how to show / hide elements by clicking on other elements. This was written using d3.js v4 and is a follow on to the multiple line graph example here.
This graph is part of the code samples for the update to the book D3 Tips and Tricks to version 4 of d3.js.
forked from d3noob‘s block: Toggling element visibility in v4
forked from denisemauldin‘s block: Toggling element visibility in v4
<!DOCTYPE html>
<meta charset="utf-8">
<style> /* set the CSS */
.line {
fill: none;
stroke: steelblue;
stroke-width: 2px;
}
.axisSteelBlue text{
fill: steelblue;
}
.axisRed text{
fill: red;
}
.legend {
font: 16px sans-serif;
font-weight: bold;
text-anchor: start;
}
</style>
<body>
<!-- load the d3.js library -->
<script src="https://d3js.org/d3.v5.min.js"></script>
<script>
// set the dimensions and margins of the graph
var margin = {top: 20, right: 40, bottom: 60, left: 50},
width = 960 - margin.left - margin.right,
height = 500 - margin.top - margin.bottom;
// parse the date / time
var parseTime = d3.timeParse("%d-%b-%y");
// set the ranges
var x = d3.scaleTime().range([0, width]);
var y0 = d3.scaleLinear().range([height, 0]);
var y1 = d3.scaleLinear().range([height, 0]);
// define the 1st line
var valueline = d3.line()
.x(function(d) { return x(d.date); })
.y(function(d) { return y0(d.close); });
// define the 2nd line
var valueline2 = d3.line()
.x(function(d) { return x(d.date); })
.y(function(d) { return y1(d.open); });
// append the svg obgect to the body of the page
// appends a 'group' element to 'svg'
// moves the 'group' element to the top left margin
var svg = d3.select("body").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 + ")");
// get the data
const makeRequest = async () => {
try {
// this parse may fail
const data = await d3.json("data.json");
return data;
} catch (err) {
console.log(err)
throw Error("Failed to load data")
}
}
async function drawGraph(data) {
// format the data
data.forEach(function(d) {
d.date = parseTime(d.date);
d.close = +d.close;
d.open = +d.open;
});
// scale the range of the data
x.domain(d3.extent(data, function(d) { return d.date; }));
y0.domain([0, d3.max(data, function(d) {return Math.max(d.close);})]);
y1.domain([0, d3.max(data, function(d) {return Math.max(d.open); })]);
// add the valueline path.
svg.append("path")
.data([data])
.attr("class", "line")
.attr("id", "blueLine")
.attr("d", valueline);
// add the valueline2 path.
svg.append("path")
.data([data])
.attr("class", "line")
.attr("id", "redLine")
.style("stroke", "red")
.attr("d", valueline2);
// add the X Axis
svg.append("g")
.attr("transform", "translate(0," + height + ")")
.call(d3.axisBottom(x));
// add the Y0 Axis
svg.append("g")
.attr("class", "axisSteelBlue")
.call(d3.axisLeft(y0));
// add the Y1 Axis
svg.append("g")
.attr("class", "axisRed")
.attr("transform", "translate( " + width + ", 0 )")
.call(d3.axisRight(y1));
// add the blue line legend
svg.append("text")
.attr("x", 0)
.attr("y", height + margin.top + 15)
.attr("class", "legend")
.style("fill", "steelblue")
.on("click", function(){
// determine if current line is visible
var active = blueLine.active ? false : true,
newOpacity = active ? 0 : 1;
// hide or show the elements
d3.select("#blueLine").style("opacity", newOpacity);
// update whether or not the elements are active
blueLine.active = active;
})
.text("Blue Line");
// add the red line legend
svg.append("text")
.attr("x", 0)
.attr("y", height + margin.top + 35)
.attr("class", "legend")
.style("fill", "red")
.on("click", function(){
// determine if current line is visible
var active = redLine.active ? false : true,
newOpacity = active ? 0 : 1;
// hide or show the elements
d3.select("#redLine").style("opacity", newOpacity);
// update whether or not the elements are active
redLine.active = active;
})
.text("Red Line");
}
makeRequest().then(data => drawGraph(data));
</script>
</body>
[
{
"date": "1-May-12",
"close": 58.13,
"open": 3.41
},
{
"date": "30-Apr-12",
"close": 53.98,
"open": 4.55
},
{
"date": "27-Apr-12",
"close": 67,
"open": 6.78
},
{
"date": "26-Apr-12",
"close": 89.7,
"open": 7.85
},
{
"date": "25-Apr-12",
"close": 99,
"open": 8.92
},
{
"date": "24-Apr-12",
"close": 130.28,
"open": 9.92
},
{
"date": "23-Apr-12",
"close": 166.7,
"open": 10.13
},
{
"date": "20-Apr-12",
"close": 234.98,
"open": 12.23
},
{
"date": "19-Apr-12",
"close": 345.44,
"open": 13.45
},
{
"date": "18-Apr-12",
"close": 443.34,
"open": 16.04
},
{
"date": "17-Apr-12",
"close": 543.7,
"open": 18.03
},
{
"date": "16-Apr-12",
"close": 580.13,
"open": 21.02
},
{
"date": "13-Apr-12",
"close": 605.23,
"open": 22.34
},
{
"date": "12-Apr-12",
"close": 622.77,
"open": 20.15
},
{
"date": "11-Apr-12",
"close": 626.2,
"open": 21.26
},
{
"date": "10-Apr-12",
"close": 628.44,
"open": 31.04
},
{
"date": "9-Apr-12",
"close": 636.23,
"open": 35.04
},
{
"date": "5-Apr-12",
"close": 633.68,
"open": 41.02
},
{
"date": "4-Apr-12",
"close": 624.31,
"open": 43.05
},
{
"date": "3-Apr-12",
"close": 629.32,
"open": 46.03
},
{
"date": "2-Apr-12",
"close": 618.63,
"open": 51.03
},
{
"date": "30-Mar-12",
"close": 599.55,
"open": 53.42
},
{
"date": "29-Mar-12",
"close": 609.86,
"open": 57.82
},
{
"date": "28-Mar-12",
"close": 617.62,
"open": 59.01
},
{
"date": "27-Mar-12",
"close": 614.48,
"open": 56.03
},
{
"date": "26-Mar-12",
"close": 606.98,
"open": 58.01
}
]