4.6 bar chart | negative

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<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>
  

<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>

https://d3js.org/d3.v4.min.js