D3 Examples - 4.6 bar chart

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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.v4.min.js" charset="utf-8"></script>
​
<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 axis stylings*/
​
.y-axis text, .x-axis text {
  font-family:'Montserrat Alternates', sans-serif;
  font-weight:400;
  font-size:10px;
  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>
</head>
​
<body>
  
<!-- Creating the headlines -->
<p id="h1">BAR CHART | NEGATIVE</p>
<div id="link">by
<a href="https://slides.com/sandravizmad">SANDRA</a></div>  
  
<script>
​
//Margin conventions
var m = {top:100, right:50, bottom:50, left:40}
    w = 800 - m.left - m.right,
    h = 800 - 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/b5562c21f4f4175b1e7864cfe924d7a5/raw/6f8d2feff718a1e04966c25aa8ad02f1d07e7d67/OECD%2520Nutrition%2520balance%2520(indicator)%2520by%2520country%25202015',
  prepare,
  d => {
​
  //Sort data by value
  d.sort((b, a) => a.Value - b.Value);
​
  //Check
  console.log(d);
​
  //Save absolut max and min of the variable Value
  var maxh = d3.max(d, d => Math.abs( +d.Value));
  var minh = d3.min(d, d => Math.abs( +d.Value));
​
  //Color scale
  var c = d3.scaleLinear()
      .domain([maxh, minh])
      .range(["#85f6fa", "#8ff798"]);
​
  //Another color scale
  var c2 = d3.scaleLinear()
      .domain([maxh, minh])
      .range(["white"]);
​
  //X scale
  var x = d3.scaleBand()
      .domain(d.map(d => d.LOCATION))
        .rangeRound([0,w])
        .paddingInner(0);
​
  //X axis
  svg.append("g")
      .attr("class", "x-axis")
      .attr("transform", `translate(0, ${h/1.05})`)
      .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([maxh, -10])
        .rangeRound([0, h]);
​
  //Call y axis
  svg.append("g")
      .attr("class", "y-axis")
      .call(d3.axisLeft()
                        .scale(y)
              .tickValues([-5, 0, 5, 10, 30, 60])
              .tickPadding(-5));
​
  //Draw the bars
  svg.selectAll('rect')
      .data(d)
        .enter()
        .append('rect')
        .attr('class', 'bar')
        .attr("x", d => x(d.LOCATION))
        .attr("width", x.bandwidth())
      .attr("y",d => { if(d.Value < 0) {
        return h/1.175 ;}
            else {
          return y(d.Value);}
        })
        .attr("height", d => h/1.175 - y(Math.abs(d.Value)))
      .attr("fill", d => { if(d.Value >= 0){
        return c(d.Value) ;}
            else{
          return c2(d.Value);}
        })
});
​
//Make sure all variables are numbers
function prepare (d) {
  d.Value = +d.Value;
  return d;
}
​
</script>
</body>
</html>
​
    