Dynamic Bar Chart with Transitions

Updates, Transitions, and Motion

Updating Visuals

Not smooth

For Bar chart, update dataset and update height, y values.


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

        //New values for dataset
        dataset = [ 11, 12, 15, 20, 18, 17, 16, 18, 23, 25,
                    5, 10, 13, 19, 21, 25, 22, 18, 15, 13 ];

        //Update all rects
        svg.selectAll("rect")
           .data(dataset)
           .attr("y", function(d) {
                return h - yScale(d);
           })
           .attr("height", function(d) {
                return yScale(d);
           });

    });

Update colors and labels similarly.

Introducing Transitions

                    //Update all rects
                    svg.selectAll("rect")
                        .data(dataset)
						.transition()
                        .delay(function(d, i) {
                            return i * 100;
                        })
						.duration(1000)
						.ease(d3.easeBounceOut)
                        .attr("y", function(d) {
                            return h - yScale(d);
                        })
                        .attr("height", function(d) {
                            return yScale(d);
                        })
                        .attr("fill", function(d) {
                            return "rgb(0,0," + Math.round(d * 10) + ")";
                        });

Ordinal Scales

                var xScale = d3.scaleBand()
							.domain(d3.range(dataset.length))
							.rangeRound([0, w])
							.paddingInner(0.08);

<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="utf-8">
		<title>D3: A flexible, scalable bar chart</title>
		<script type="text/javascript" src="https://d3js.org/d3.v4.min.js"></script>
		<style type="text/css">
			div {
				position:absolute;
				margin:auto;

}
		</style>
	</head>
	<body>
	<div>
		<button>Randomise!</button>
	</div>
	<br>

//Width and height
			var w = 960;
			var h = 500;
			
			var dataset = [ 5, 10, 13, 19, 21, 25, 22, 18, 15, 13,
							11, 12, 15, 20, 18, 17, 16, 18, 23, 25,34,36,12,32,56,23,25,34,87,43,54 ];

var xScale = d3.scaleBand()
							.domain(d3.range(dataset.length))
							.rangeRound([0, w])
							.paddingInner(0.08);

var yScale = d3.scaleLinear()
							.domain([0, d3.max(dataset)])
							.range([50, 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) + ")";
			   });

//Create labels
			svg.selectAll("text")
			   .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) {
                    if(yScale(d)<=15) {
                        return h - yScale(d) - 2;
                    }else{
                        return h - yScale(d) + 14;
                    }
                })
			   .attr("font-family", "sans-serif")
			   .attr("font-size", "11px")
			   .attr("fill", function (d) {
				   if(yScale(d)<=15){
				       return "black"
				   }else{
				       return "white";
				   }
               });

//On click, update with new data
            d3.select("button")
                .on("click", function() {

//New values for dataset
                    var numValues = dataset.length;						//Count original length of dataset
                    dataset = [];  						 				//Initialize empty array
                    var maxValue = 100;
                    for (var i = 0; i < numValues; i++) {				//Loop numValues times
                        var newNumber = Math.floor(Math.random() * maxValue); //New random integer (0-24)
                        dataset.push(newNumber);			 			//Add new number to array
                    }

yScale.domain([0, d3.max(dataset)]);

//Update all rects
                    svg.selectAll("rect")
                        .data(dataset)
						.transition()
                        .delay(function(d, i) {
                            return i * 100;
                        })
						.duration(1000)
						.ease(d3.easeBounceOut)
                        .attr("y", function(d) {
                            return h - yScale(d);
                        })
                        .attr("height", function(d) {
                            return yScale(d);
                        })
                        .attr("fill", function(d) {
                            return "rgb(0,0," + Math.round(d * 10) + ")";
                        });

//Update all labels
                    svg.selectAll("text")
                        .data(dataset)
                        .transition()								// <-- Now with
                        .delay(function(d, i) {
                            return i * 100;
                        })
                        .duration(1000)
						.ease(d3.easeCircleIn)
							.text(function(d) {
                            return d;
                        })
                        .attr("x", function(d, i) {
                            return xScale(i) + xScale.bandwidth() / 2;
                        })
                        .attr("y", function(d) {
                            if(yScale(d)<=15) {
                                return h - yScale(d) - 2;
                            }else{
                                return h - yScale(d) + 14;
							}
                        })
                        .attr("fill", function (d) {
                            if(yScale(d)<=15){
                                return "black"
                            }else{
                                return "white";
                            }
                        });
                });
			
		</script>

</body>
</html>

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