D3 Examples - 7.9 animated line plot

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<!DOCTYPE html>
<meta charset="utf-8">
<html>
<head>
​
<!-- Google fonts reference -->
<link href="https://fonts.googleapis.com/css2?family=Montserrat+Alternates:ital,wght@0,100;0,200;0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,100;1,200;1,300;1,400;1,500;1,600;1,700;1,800;1,900&family=Montserrat:ital,wght@0,100;0,200;0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,100;1,200;1,300;1,400;1,500;1,600;1,700;1,800;1,900&family=Roboto:ital,wght@0,100;0,300;1,100;1,300&display=swap" rel="stylesheet">
​
<!-- Connecting with D3 library-->
<script src="https://d3js.org/d3.v3.min.js"></script>
​
<!-- Creating the headlines -->
<p id="h1">LINE CHART | ANIMATION </p>
<div id="link">by
<a href="https://slides.com/sandravizmad">SANDRA</a></div>
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<!-- Create the starting button -->
<button id="start" style="position: absolute; margin-left:12px; margin-top:50px;">START</button>
​
<style>
​
/*Defining text stylings*/
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#h1 {
  font-size:30px;
  margin:30px 0px 0px 20px;
  color:#f5fa91;
  font-family:'Montserrat Alternates', sans-serif;
  font-weight:300;
}
​
#link {
    font-family:'Montserrat Alternates', sans-serif;
  font-weight:200;
  font-size:10px;
    margin:5px 0px 0px 22px;
  color:white;
}
​
a:link, a:visited, a:active {
    text-decoration: none;
  color:white;
  border-bottom:1.5px dotted white;
}
​
body {
  background-color:#011227;
}
​
/*Defining axis stylings*/
​
.y-axis text, .x-axis text {
  font-family:'Montserrat Alternates', sans-serif;
  font-weight:100;
  font-size:9px;
  opacity:1;
  fill:white;
}
​
.x-axis path, .y-axis path {
  fill:none;
  stroke-width:0;
  stroke-opacity:1;
  stroke:white;
}
​
.y-axis line, .x-axis line {
  fill:none;
  stroke-width:1;
  stroke-opacity:1;
  stroke:white;
  stroke-dasharray:2;
}
​
/*Defining chart stylings*/
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.line {
   fill:none;
   stroke:#85f6fa;
   stroke-width:2px;
}
​
/*Defining button stylings*/
​
#start, #reset {
  font-family:'Montserrat Alternates', sans-serif;
  font-size:12px;
  color:white;
  border:0;
  text-align:center;
  background-color:#011227;
}
​
#start:hover, #reset:hover {
  color:#f5fa91;
  background-color:#011227;
}
​
</style>
</head>
​
<body>
<script>
​
//Margin conventions
var m = {top:100, right:50, bottom:50, left:50}
    w = 600 - m.left - m.right,
    h = 600 - m.top - m.bottom;
​
//Container
var svg = d3.select("body")
    .append("svg")
    .attr("width", w + m.left + m.right)
    .attr("height", h + m.top + m.bottom)
    .append("g")
    .attr("transform", `translate(${m.left}, ${m.top})`);
​
//Data format
var parseDate = d3.time.format("%d-%b-%y").parse;
​
//Data loading
d3.csv(
  "https://gist.githubusercontent.com/sandravizz/17951d49ca9999fb872ef1edb769889c/raw/5d6800bfd272edd42fa017846df1cadefa02098a/Example-data2",
  data => {
​
  data.forEach( d => {
     d.date = parseDate(d.date);
     d.close = +d.close;
  });
​
  //X scale
  var x = d3.time.scale()
      .domain(d3.extent(data, d => d.date))
        .range([0, w]);
​
  //Y scale
  var y = d3.scale.linear()
      .domain([0, d3.max(data, d => d.close)])
        .range([h, 0]);
​
  //Line generator
  var line = d3.svg.line()
      .x(d => x(d.date))
      .y(d => y(d.close));
​
  //Draw the line
  svg.append("path")
     .attr("class", "line")
     .attr("d", line(data));
​
  //X axis
  svg.append("g")
     .attr("class", "x-axis")
     .attr("transform", `translate(0, ${h})`)
     .call(d3.svg.axis()
               .scale(x)
             .orient("bottom")
               .ticks(5)
             .tickSize(0)
             .tickPadding(10));
​
  //Y axis
  svg.append("g")
     .attr("class", "y-axis")
     .call(d3.svg.axis()
               .scale(y)
             .orient("left")
               .ticks(",.0s")
             .tickValues([50, 100, 600, 650])
             .tickSize(-w)
             .tickPadding(10));
});
​
//Start Animation on Click
d3.select("#start")
  .on("click", () => {
​
  //Data loading
  d3.csv(
    "https://gist.githubusercontent.com/sandravizz/44ecd62a430f8adf1065722964262406/raw/8cd127433fddb63cc4ecea3d4fac532297dd6a30/Test-dataset",
    data => {
      
  data.forEach(d => {
  d.date = parseDate(d.date);
  d.close2 = +d.close2;
  });
​
  //X scale
  var x = d3.time.scale()
      .domain(d3.extent(data, d => d.date))
        .range([0, w]);
​
  //Y scale
  var y = d3.scale.linear()
      .domain([0, d3.max(data, d => d.close2)])
        .range([h, 0]);
​
  //New line genrator
  var lineNew = d3.svg.line()
      .x(d => x(d.date))
      .y(d => y(d.close2));
​
  //Select the section where we apply the update
  var svg = d3.select("body")
      .transition();
​
  //Drawing again the path
  svg.select(".line")
     .duration(1000)
     .attr("d", lineNew(data));
      
  //X axis
  svg.select(".x-axis")
     .duration(2000)
     .call(d3.svg.axis()
               .scale(x)
             .orient("bottom")
               .ticks(5)
             .tickSize(0)
             .tickPadding(10));
​
  //Y axis
  svg.select(".y-axis")
     .duration(2000)
     .call(d3.svg.axis()
               .scale(y)
             .orient("left")
               .ticks(5)
             .tickSize(-w)
             .tickPadding(10));
​
})
});
​
</script>
</body>
</html>
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