bar chart with clicking to sort and hovering

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
  </style>
</head>

<body>
		<script type="text/javascript">
			//Width and height
			var w = 600;
			var h = 250;
			
			var dataset = [ 5, 10, 13, 19, 21, 25, 22, 18, 15, 13,
							11, 12, 15, 20, 18, 17, 16, 18, 23, 25 ];
			var xScale = d3.scaleBand()
							.domain(d3.range(dataset.length))
							.rangeRound([0, w])
							.paddingInner(0.05);
			var yScale = d3.scaleLinear()
							.domain([0, d3.max(dataset)])
							.range([0, h]);
			
			//Create SVG element
			var svg = d3.select("body")
						.append("svg")
						.attr("width", w)
						.attr("height", h);
			//Create bars
			svg.selectAll("rect")
			   .data(dataset)
			   .enter()
			   .append("rect")
			   .attr("x", function(d, i) {
			   		return xScale(i);
			   })
			   .attr("y", function(d) {
			   		return h - yScale(d);
			   })
			   .attr("width", xScale.bandwidth())
			   .attr("height", function(d) {
			   		return yScale(d);
			   })
			   .attr("fill", function(d) {
					return "rgb(0, 0, " + Math.round(d * 10) + ")";
			   })
			   .on("mouseover", function() {
			   		d3.select(this)
			   			.attr("fill", "orange");
			   })
			   .on("mouseout", function(d) {
				   d3.select(this)
				   		.transition()
				   		.duration(250)
						.attr("fill", "rgb(0, 0, " + (d * 10) + ")");
			   })
			   .on("click", function() {
			   		sortBars();
            sortLabels();
			   });
			//Create labels
		  var labels =	svg.selectAll("text")
    
			    labels.data(dataset)
			    .enter()
			    .append("text")
			    .text(function(d) {
			   		return d;
			    })
			    .attr("text-anchor", "middle")
			    .attr("x", function(d, i) {
			   		return xScale(i) + xScale.bandwidth() / 2;
			    })
			    .attr("y", function(d) {
			   		return h - yScale(d) + 10;
			    })
			    .attr("font-family", "sans-serif")
			    .attr("font-size", "11px")
			    .attr("fill", "white");
			
			//Define sort function
			var sortBars = function() {
				svg.selectAll("rect")
				   .sort(function(a, b) {
					   return d3.ascending(a, b);
				   	})
				   .transition()
				   .duration(1000)
				   .attr("x", function(d, i) {
				   		return xScale(i);
				   });       
     
			};
        
   var sortLabels = function(){
     
    svg.selectAll("text")
    .remove();
     
     data2 = dataset.sort();
         
     labels
			   .data(data2)
			   .enter()
			   .append("text")
			   .text(function(d) {
			   		return d;
			   })
			   .attr("text-anchor", "middle")
			   .attr("x", 0)
			   .attr("y", function(d) {
			   	return h - yScale(d) + 10;
			   })
			   .attr("font-family", "sans-serif")
			   .attr("font-size", "11px")
			   .attr("fill", "white")
         .transition()
         .duration(500)               
         .attr("x", function(d, i) {
                    return xScale(i) + xScale.bandwidth() / 2;
                });
        
       
     
      };

</script>
	</body>

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