19.remove-bar-fromLeft

<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="utf-8">
    
		<title>D3: Removing values from a chart</title>
    
		<script type="text/javascript" src="https://d3js.org/d3.v4.min.js"></script>
    
		<style type="text/css">
			/* No style rules here yet */
		</style>
    
	</head>
	<body>
	
		<p>Click on this text to remove a data value from the chart!</p>
			
		<script type="text/javascript">

var xScale = d3.scaleBand()
							.domain(d3.range(dataset.length))
							.rangeRound([0, w])
      				.padding(0.05);
      
			var yScale = d3.scaleLinear()
							.domain([0, d3.max(dataset, function(d) { return d.value; })])
							.range([h, 0]);
			
			//a func to access key only
			var key = function(d) {
				return d.key;
			};

svg.selectAll("text")
			   .data(dataset, key)		
			   .enter()
			   .append("text")
			   .text(function(d) {
			   		return d.value;
			   })
			   .attr("text-anchor", "middle")
			   .attr("x", function(d, i) {
			   		return xScale(i) + xScale.bandwidth() / 2;
			   })
			   .attr("y", function(d) {
			   		return yScale(d.value) + 14;
			   })
			   .attr("font-family", "sans-serif")
			   .attr("font-size", "11px")
			   .attr("fill", "white");

d3.select("p")
				.on("click", function() {

// ---- remove the first element of array        
					dataset.shift();

xScale.domain(d3.range(dataset.length));
					yScale.domain([0, d3.max(dataset, function(d) { return d.value; })]);

var texts = svg.selectAll("text")
					   .data(dataset, key)		
  
  		texts
      	  	.enter().append("text")
      			.text(function(d){return d.value})
      			.attr("x", w + xScale.bandwidth()/2)
      			.attr("y", function(d){return yScale(d.value)+14;})
      			.attr("font-family", "sans-serif")
            .attr("font-size", "11px")
            .attr("fill", "white")

.merge(texts)
					   .transition()
					   .duration(500)
      			 .text(function(d){return d.value;})
					   .attr("x", function(d, i) {
							return xScale(i) + xScale.bandwidth() / 2;
					   })
					   .attr("y", function(d) {
							return yScale(d.value) + 14;
					   });

texts
      		.exit()
      		.transition()
      		.duration(500)
      		.attr("x", -xScale.bandwidth())
      		.remove();
        
      }); // click function end
			
		</script>
	</body>
</html>

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