small multiple lines

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<!DOCTYPE html>
<meta charset="utf-8">
<style>

body {
  font: 14px sans-serif;
}

.axis path,
  
.axis line {
  fill: none;
  stroke: #e5e5e5;
  shape-rendering: crispEdges;
}

.axis path {
  display: none;
}

.line {
  fill: none;
  stroke-width: 1px;
  opacity: 1;
}
 
  
</style>

<body>

<p> Work in Progress !!!!!</p>
  
<div style="width: 1800px; padding-left: 0.75cm">
<div class="container" id="chart-a" style="float: left; width: 360px; height: 500px;margin-top: 25px;"><h2 style="text-align: center;padding-left: 70px;">Cohort A</h2></div>
<div class="container" id="chart-b" style="float: left; width: 360px; height: 500px;margin-top: 25px;"><h2 style="text-align: center;padding-left: 70px;">Cohort B</h2></div>
<div class="container" id="chart-c" style="float: left; width: 360px; height: 500px;margin-top: 25px;"><h2 style="text-align: center;padding-left: 70px;">Cohort C</h2></div>
<div class="container" id="chart-d" style="float: left; width: 360px; height: 500px;margin-top: 25px;"><h2 style="text-align: center;padding-left: 70px;">Cohort D</h2></div>
<div class="container" id="chart-e" style="float: left; width: 360px; height: 500px;margin-top: 25px;"><h2 style="text-align: center;padding-left: 70px;">Cohort E</h2></div>
</div>
  
<script src="//d3js.org/d3.v3.min.js"></script>
<script>

var margin1 = {top: 60, right: 80, bottom: 60, left: 80},
    width1 = 360,
    height1 = 410 - margin1.top - margin1.bottom;

var y = d3.scale.linear()
    .range([height1, 0])
  .domain([1500,3000]);

var color = d3.scale.ordinal()  .range(["#910727","#CF1D1D", "#D93B2A", "#E35938", "#ED7746", "#F4AA64", "#F1C075", "#EED585","#EBEB96", "#E6E7A9","#E1E3BC", "#DDE0D0"])
  .domain(["A","B","C","D","E","F","G","H","I","J","K","L"]);

var idsnos = [1,2,3,4,5,6,7,8,9,10,11,12];
  
var x = d3.scale.linear()
    .range([0, width1-margin1.right*1.3])
    .domain([0, 100]);

var xAxis = d3.svg.axis()
    .scale(x)
    .orient("bottom")
  .ticks(2)
  .tickFormat(function(d) { return parseInt(d, 10) + "%"; });

var yAxis = d3.svg.axis()
    .scale(y)
    .orient("left")
  .ticks(5)
  .tickSize(-width1, 0, 0);

var yAxisnotext = d3.svg.axis()
    .scale(y)
    .orient("left")
  .ticks(5)
  .tickSize(-width1, 0, 0)
  .tickFormat("");  
  
var line = d3.svg.line()
    .interpolate("basis")
    .x(function(d) { return x(d.eventtime); })
    .y(function(d) { return y(d.code); });

var svga = d3.select("body").select("div#chart-a").append("svg")
    .attr("width", width1)
    .attr("height", height1 + margin1.top + margin1.bottom)
  .append("g")
    .attr("transform", "translate(" + margin1.left + "," + margin1.top + ")");

var svgb = d3.select("body").select("div#chart-b").append("svg")
    .attr("width", width1)
    .attr("height", height1 + margin1.top + margin1.bottom)
  .append("g")
    .attr("transform", "translate(" + margin1.left + "," + margin1.top + ")");
 
var svgc = d3.select("body").select("div#chart-c").append("svg")
    .attr("width", width1)
    .attr("height", height1 + margin1.top + margin1.bottom)
  .append("g")
    .attr("transform", "translate(" + margin1.left + "," + margin1.top + ")");
  
var svgd = d3.select("body").select("div#chart-d").append("svg")
    .attr("width", width1)
    .attr("height", height1 + margin1.top + margin1.bottom)
  .append("g")
    .attr("transform", "translate(" + margin1.left + "," + margin1.top + ")");
  
var svge = d3.select("body").select("div#chart-e").append("svg")
    .attr("width", width1)
    .attr("height", height1 + margin1.top + margin1.bottom)
  .append("g")
    .attr("transform", "translate(" + margin1.left + "," + margin1.top + ")");

// Cohort A
  
d3.csv("ratesA2.txt", function(error, data) {
  if (error) throw error;
  
  data.forEach(function (d,i) {
    d.eventtime = +d.eventtime;
    d.A = +d.A;
    d.B = +d.B;
    d.C = +d.C;
    d.D = +d.D;
    d.E = +d.E;
    d.F = +d.F;
    d.G = +d.G;
    d.H = +d.H;
    d.I = +d.I;
    d.J = +d.J;
    d.K = +d.K;
    d.L = +d.L;
  })

//Append axes
  
  svga.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + height1 + ")")
      .call(xAxis);

svga.append("g")
      .attr("class", "y axis")
      .call(yAxis);

var linethis = d3.svg.line()
    .interpolate("basis")
    .x(function(d) { return x(d.eventtime); })
    .y(function(d) { return y(d.code); });

//Append the lines
    var lines = svga.selectAll(".lines")
        .data(cohortLines)
      .enter().append("g")
  
 ;

//Actual full opacity thin line   
  lines.append("path")
          .attr("class", "line")
          .classed("mainline", true)
          .attr("d", function(d) { return linethis(d.values); })
          .style("stroke", function(d) { return color(d.name); })
      .style("stroke-width", 1.5);

// Fading and Selecting Lines
 doHover();
  
  
// Y-axis label
d3.select("body").select("div#chart-a").select("svg").append("text")
            .attr("text-anchor", "middle")  
            .attr("font-size", "18px")
            .attr("transform", "translate("
                  + (margin1.left/3) +","
                  +((height1 + margin1.top + margin1.bottom)/2)+")rotate(-90)")
            .text("Glicko Rating");  
  
});

// Cohort B
 
  d3.csv("ratesB2.txt", function(error, data) {
  if (error) throw error;
  
  data.forEach(function (d,i) {
  d.eventtime = +d.eventtime;
    d.A = +d.A;
    d.B = +d.B;
    d.C = +d.C;
    d.D = +d.D;
    d.E = +d.E;
    d.F = +d.F;
    d.G = +d.G;
    d.H = +d.H;
    d.I = +d.I;
    d.J = +d.J;
    d.K = +d.K;
    d.L = +d.L;
  })

svgb.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + height1 + ")")
      .call(xAxis);

svgb.append("g")
      .attr("class", "y axis")
      .call(yAxisnotext);

var linethis = d3.svg.line()
    .interpolate("basis")
    .x(function(d) { return x(d.eventtime); })
    .y(function(d) { return y(d.code); });

//Append the lines
    var lines = svgb.selectAll(".lines")
        .data(cohortLines)
      .enter().append("g")
  
 ;

// Fading and Selecting Lines
 doHover();
  
 
    
});

// Cohort C
 
  d3.csv("ratesC2.txt", function(error, data) {
  if (error) throw error;
  
  data.forEach(function (d,i) {
  d.eventtime = +d.eventtime;
    d.A = +d.A;
    d.B = +d.B;
    d.C = +d.C;
    d.D = +d.D;
    d.E = +d.E;
    d.F = +d.F;
    d.G = +d.G;
    d.H = +d.H;
    d.I = +d.I;
    d.J = +d.J;
    d.K = +d.K;
    d.L = +d.L;
  })

//Append axes

svgc.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + height1 + ")")
      .call(xAxis);

svgc.append("g")
      .attr("class", "y axis")
      .call(yAxisnotext);

var linethis = d3.svg.line()
    .interpolate("basis")
    .x(function(d) { return x(d.eventtime); })
    .y(function(d) { return y(d.code); });

//Append the lines
    var lines = svgc.selectAll(".lines")
        .data(cohortLines)
      .enter().append("g")
  
 ;

// Fading and Selecting Lines
 doHover();
  
});

// Cohort D
 
  d3.csv("ratesD2.txt", function(error, data) {
  if (error) throw error;
  
  data.forEach(function (d,i) {
  d.eventtime = +d.eventtime;
    d.A = +d.A;
    d.B = +d.B;
    d.C = +d.C;
    d.D = +d.D;
    d.E = +d.E;
    d.F = +d.F;
    d.G = +d.G;
    d.H = +d.H;
    d.I = +d.I;
    d.J = +d.J;
    d.K = +d.K;
    d.L = +d.L;
  })

//Append axes
  svgd.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + height1 + ")")
      .call(xAxis);

svgd.append("g")
      .attr("class", "y axis")
      .call(yAxisnotext);

var linethis = d3.svg.line()
    .interpolate("basis")
    .x(function(d) { return x(d.eventtime); })
    .y(function(d) { return y(d.code); });

//Append the lines
    var lines = svgd.selectAll(".lines")
        .data(cohortLines)
      .enter().append("g")
  
 ;

// Fading and Selecting Lines
 doHover();
  
 
    
});

// Cohort E
 
  d3.csv("ratesE2.txt", function(error, data) {
  if (error) throw error;
  
  data.forEach(function (d,i) {
  d.eventtime = +d.eventtime;
    d.A = +d.A;
    d.B = +d.B;
    d.C = +d.C;
    d.D = +d.D;
    d.E = +d.E;
    d.F = +d.F;
    d.G = +d.G;
    d.H = +d.H;
    d.I = +d.I;
    d.J = +d.J;
    d.K = +d.K;
    d.L = +d.L;
  })

//Append axes
  svge.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + height1 + ")")
      .call(xAxis);

svge.append("g")
      .attr("class", "y axis")
      .call(yAxisnotext);

var linethis = d3.svg.line()
    .interpolate("basis")
    .x(function(d) { return x(d.eventtime); })
    .y(function(d) { return y(d.code); });

//Append the lines
    var lines = svge.selectAll(".lines")
        .data(cohortLines)
      .enter().append("g")
  
 ;

// Fading and Selecting Lines
 doHover();
 
    
});  
    
  
  
  
// Function  
  
function doHover() {
  d3.selectAll('path.line')//register this to all paths
    .on("mouseover", function(d,i) {
      //first make all lines vanish
      d3.selectAll('path.line')
        .style("opacity", 0.2)
        .style("stroke-width", 1)
      //only show lines which have same name.
      d3.selectAll('path.line').filter(function(d1) {
          return d.name == d1.name
        })
        .style("opacity", 1)
        .style("stroke-width", 2.5);
       
    
      d3.select("div#chart-a.container svg")
        .append("text")
        .attr("id", "cohorttext")
        .text("" + d.name +"-" + idsnos[i%idsnos.length])
        .attr("x", (width1-margin1.right/2))
        .attr("y", margin1.top/2)
        .style("fill", color(d.name))
        .style("font-weight", "bold")
        .style("font-size", "18px");
        
    d3.select("div#chart-b.container svg")
        .append("text")
        .attr("id", "cohorttext")
           .text("" + d.name +"-" + idsnos[i%idsnos.length])
        .attr("x", (width1-margin1.right/2))
        .attr("y", margin1.top/2)
       .style("fill", color(d.name))
        .style("font-weight", "bold")
        .style("font-size", "18px");

d3.select("div#chart-c.container svg")
        .append("text")
        .attr("id", "cohorttext")
            .text("" + d.name +"-" + idsnos[i%idsnos.length])
        .attr("x", (width1-margin1.right/2))
        .attr("y", margin1.top/2)
      .style("fill", color(d.name))
        .style("font-weight", "bold")
        .style("font-size", "18px");
  
  d3.select("div#chart-d.container svg")
        .append("text")
        .attr("id", "cohorttext")
     .text("" + d.name +"-" + idsnos[i%idsnos.length])
         .attr("x", (width1-margin1.right/2))
       .attr("y", margin1.top/2)
     .style("fill", color(d.name))
        .style("font-weight", "bold")
        .style("font-size", "18px");

d3.select("div#chart-e.container svg")
        .append("text")
        .attr("id", "cohorttext")
     .text("" + d.name +"-" + idsnos[i%idsnos.length])
        .attr("x", (width1-margin1.right/2))
        .attr("y", margin1.top/2)
      .style("fill", color(d.name))
        .style("font-weight", "bold")
        .style("font-size", "18px");

})

.on("mouseout", function() {
      d3.selectAll('path.line')
        .style("opacity", 1)
        .style("stroke-width", 1.5);
      d3.selectAll("#cohorttext").remove()
   //   d3.selectAll("#cohorttextx").remove()

})
}  
  
  
  
</script>

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