D3 Examples - 7.6 animated bar chart

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<!DOCTYPE html>
<html lang="en">
<meta charset="utf-8">
<script src="https://d3js.org/d3.v4.min.js"></script>
​
<!-- Google fonts Second 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.v4.min.js"></script>
  
<!-- Creating the headlines -->
<p id="h1">BAR CHART | UPDATE</p> 
<div id="link">by 
<a href="https://slides.com/sandravizmad">SANDRA</a> | <a href="https://data.oecd.org/biodiver/built-up-area.htm#indicator-chart">DATA</a></div>
   
<!-- Create the starting button -->
<button id="start" style="position: absolute; margin-left:20px; margin-top:60px;">START</button>
        
<style>
  
/*Defining text stylings*/ 
  
#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 button stylings*/
  
#start, #reset {
  font-family:'Montserrat Alternates', sans-serif;
  font-size:12px;
  color:WHITE; 
  border:0;
  line-height:1;
  text-align:center;
  background-color:#011227;     
}
​
#start:hover, #reset:hover {
  color:#f5fa91;  
  background-color:NONE;
}
​
/*Defining axis stylings*/
​
.x-axis text {
  font-family:'Montserrat Alternates', sans-serif;
  font-weight:400;
  font-size:9px;
  opacity:1;
  fill:white;
}
  
.y-axis text {
  font-family:'Montserrat Alternates', sans-serif;
  font-weight:400;
  font-size:7px;
  opacity:1;
  fill:white;
}
​
.y-axis path {
  fill:none;
  stroke-width:0;
  stroke-opacity:1;
  stroke:white;
}
  
.x-axis path {
  fill:none;
  stroke-width:0;
  stroke-opacity:1;
  stroke:white;
}
​
.y-axis line, .x-axis line {
  fill:none;
  stroke-width:0;
  stroke-opacity:1;
  stroke:white;
  stroke-dasharray:2;
} 
   
/*Defining chart stylings*/
  
.bar {
  fill-opacity:0.8;  
}
  
</style>
​
<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 loading   
d3.csv(
  'https://gist.githubusercontent.com/sandravizz/d0b1e5419df723b600c872b517458193/raw/e8d72fc67ea127b7e65eb5ce4319c6c2018c3799/OECD%2520BUILT%2520UP%2520AREA%2520by%2520country%25202000', 
  prepare, 
  data => {
  
//Sort data by value
data.sort((b, a) => a.Value - b.Value);
    
//Check
console.log(data);
  
//Color scale
var c = d3.scaleLinear()
    .domain([0, 550])
    .range(["#85f6fa", "#8ff798"]);
  
//X scale 
var x = d3.scaleBand()
        .domain(data.map( d => d.LOCATION))
      .rangeRound([0, w])
        .paddingInner(0.04);
    
//X axis 
svg.append("g")
   .attr("class", "x-axis")
   .attr("transform", `translate(0, ${h})`)
   .call(d3.axisBottom()
                     .scale(x))
   .selectAll("text")
   .attr("y", 6)
   .attr("x", 0)
   .attr("transform", "rotate(35)")
   .style("text-anchor", "start");
  
//Y scale
var y = d3.scaleLinear()
        .domain([0, 550])
        .rangeRound([h, 0]);
     
//Y axis
svg.append("g")
   .attr("class", "y-axis")
   .call(d3.axisLeft()
                          .scale(y)
                          .ticks(5));
  
//Draw the bars
svg.selectAll('rect')
   .data(data)
     .enter()
     .append('rect')
     .attr('class', 'bar')
     .attr("x", d => x(d.LOCATION))
     .attr("width", x.bandwidth()) 
   .attr("y", d => y(+d.Value))
     .attr("height", d => h - y(d.Value)) 
   .attr("fill", d => c(d.Value))
  
});
               
//Make sure all variables are numbers
function prepare (d) {
  d.Value = +d.Value;
  return d;
}
​
// Animation by click 
d3.select("#start")
  .on("click", function() {
        
//Data loading   
d3.csv(
  'https://gist.githubusercontent.com/sandravizmad/8e50af53c013d57ce3cdb4c07a42f6e0/raw/d983b9517212f95036db77a8396c5a61f2493e3d/OECD%2520BUILT%2520UP%2520AREA%2520by%2520country%25202014', 
  prepare, 
  data => {
     
  //Sort data by value
  data.sort((b, a) => {return a.Value - b.Value;});
    
  //Color scale
  var c = d3.scaleLinear()
      .domain([0, 550])
      .range(["#85f6fa", "#8ff798"]);
    
  //X scale 
  var x = d3.scaleBand()
        .domain(data.map( d => d.LOCATION))
        .rangeRound([0, w])
        .paddingInner(0.05);
​
  //Transition of the x axis
  svg.select(".x-axis")
     .transition()
     .duration(1000)  
     .call(d3.axisBottom()
                          .scale(x)
                          .ticks(5))
     .attr("transform", `translate(0, ${h})`);
                    
  //Y scale
  var y = d3.scaleLinear()
        .domain([0, 550])
      .rangeRound([h, 0]);   
    
  //Draw the bars
  svg.selectAll('rect')
     .data(data)  
     .transition()
     .duration(2000)
     .delay(1000)
     .attr("y", d => y(d.Value))
     .attr("height", d => h - y(d.Value))
     .attr("fill", d => c(d.Value)); 
}) 
​
//Make sure all variables are numbers
function prepare (d) {
  d.Value = +d.Value;
  return d;
}
});
  
</script>
</body>
</html>
    